9+ Definitive Technology BP7006 Speakers: Review & Guide


9+ Definitive Technology BP7006 Speakers: Review & Guide

The product referenced is a specific model of loudspeaker manufactured by Definitive Technology. It is a bipolar floor-standing speaker, suggesting a design that radiates sound from both the front and rear of the cabinet. This configuration is intended to create a more immersive and spacious listening experience compared to traditional direct-radiating speakers.

This particular model offers enhanced bass response through an integrated powered subwoofer. This feature alleviates the need for a separate subwoofer in some setups, offering a more streamlined audio solution. Historically, the brand is known for innovative speaker designs focused on high fidelity and room-filling sound, positioning this model within that legacy.

Subsequent sections will delve into the specifications, performance characteristics, and potential applications of this specific loudspeaker model, providing a thorough evaluation of its strengths and weaknesses within the broader context of home audio systems.

1. Bipolar radiation pattern

The bipolar radiation pattern is a defining characteristic of the Definitive Technology speakers BP7006 and contributes significantly to its overall sonic performance. This design choice directly impacts the way sound waves propagate from the speaker, influencing the perceived soundstage and spatial characteristics of the audio.

  • Soundstage Width and Depth

    A bipolar speaker radiates sound from both the front and rear of its cabinet. This creates a broader and deeper soundstage compared to traditional forward-firing speakers. The reflections from the rear-firing drivers interact with the room acoustics, adding a sense of spaciousness and envelopment. In the BP7006, this effect aims to immerse the listener more fully in the audio experience.

  • Room Interaction and Placement

    The bipolar design is inherently more sensitive to room acoustics than traditional speakers. The placement of the BP7006 requires careful consideration to mitigate potential issues arising from excessive or uneven reflections. Optimal positioning typically involves allowing sufficient space behind the speakers to enable proper development of the rear sound field. Incorrect placement can lead to a blurred or indistinct soundstage.

  • Perceived Ambience and Realism

    By generating sound from both the front and rear, bipolar speakers can reproduce a more realistic sense of ambience. The BP7006 leverages this characteristic to recreate the acoustic properties of the recording environment, providing a more authentic listening experience. This is particularly noticeable with recordings that contain significant ambient information, such as live concerts or orchestral performances.

  • Frequency Response Uniformity

    While the bipolar design offers advantages in soundstage and ambience, it can also introduce complexities in achieving a uniform frequency response. The interaction between the front and rear sound waves can result in constructive and destructive interference at certain frequencies. Definitive Technology engineers the BP7006 to minimize these effects through careful driver selection and cabinet design, aiming for a balanced and accurate sonic presentation.

In summary, the bipolar radiation pattern is a core element of the Definitive Technology speakers BP7006, contributing to its spacious soundstage and immersive audio experience. However, it also necessitates careful attention to room acoustics and speaker placement to realize its full potential. The design represents a deliberate trade-off between sonic characteristics and practical considerations, reflecting the brand’s commitment to delivering a unique and engaging listening experience.

2. Integrated powered subwoofer

The inclusion of an integrated powered subwoofer in the Definitive Technology speakers BP7006 represents a significant design decision aimed at enhancing low-frequency reproduction within a single speaker enclosure. This feature distinguishes the model from traditional passive loudspeakers that require a separate subwoofer unit for optimal bass performance.

  • Dedicated Low-Frequency Amplification

    The integrated subwoofer possesses its own dedicated amplifier, distinct from the amplifier powering the mid-range and high-frequency drivers. This allows for precise control and optimization of the bass frequencies without drawing power from the main amplifier. For the BP7006, this typically translates to a cleaner, more dynamic low-end response, as the dedicated amplifier is specifically tuned to drive the subwoofer driver efficiently. An example would be the ability to reproduce deep bass notes in a movie soundtrack without straining the main amplifier responsible for the rest of the audio spectrum. The implication is reduced distortion and improved overall clarity.

  • Optimized Driver and Enclosure Matching

    The subwoofer driver and its enclosure are engineered as a cohesive unit within the BP7006. This allows for precise matching of the driver’s parameters to the enclosure volume and port tuning (if present), resulting in optimal bass extension and efficiency. In contrast to adding an external subwoofer, the integrated design eliminates the need for the user to experiment with crossover settings and placement to achieve seamless integration. The result is a more predictable and consistent bass performance regardless of room acoustics.

  • Space-Saving Design and Simplified Setup

    Integrating the subwoofer into the main speaker cabinet eliminates the need for a separate subwoofer unit, conserving floor space and simplifying system setup. This is particularly advantageous in smaller listening environments where space is at a premium. The BP7006, by incorporating the subwoofer, offers a more streamlined and aesthetically cleaner audio solution. The implication is a less cluttered listening room and easier integration into existing home theater or stereo systems.

  • Adjustability and Control

    The integrated powered subwoofer typically includes user-adjustable controls for volume and potentially crossover frequency. These controls allow the user to fine-tune the bass response to match their personal preferences and room acoustics. This level of control ensures that the bass integrates seamlessly with the mid-range and high-frequency drivers, creating a balanced and cohesive sonic presentation. This ensures that the user can tailor the sound of the BP7006 to suit a variety of listening environments and source materials.

In summary, the integrated powered subwoofer in the Definitive Technology speakers BP7006 provides a comprehensive low-frequency solution within a single speaker cabinet. This design offers advantages in terms of space-saving, simplified setup, and optimized performance, contributing to a more convenient and enjoyable listening experience. This integration showcases an attempt to produce a full-range speaker system in an efficient form factor.

3. Frequency response range

The frequency response range represents a fundamental performance metric of the Definitive Technology speakers BP7006, defining the spectrum of audio frequencies the speakers can reproduce with reasonable accuracy and output level. It is a direct determinant of the speaker’s ability to faithfully recreate the tonal balance of the original audio source. A wider and more uniform frequency response range generally indicates a more capable and versatile speaker system. For the BP7006, the specified range directly impacts the perceived clarity, detail, and overall realism of the audio reproduction. For instance, if the speakers have a poor low-frequency response (e.g., lacking frequencies below 50Hz), it will fail to accurately reproduce the deep bass found in many musical genres and movie soundtracks, resulting in a less immersive experience.

Specifically, the integration of a powered subwoofer within the BP7006 is directly aimed at extending the lower end of the frequency response range. The subwoofer component handles frequencies that the mid-range and high-frequency drivers cannot effectively reproduce, thereby providing a more complete and balanced audio spectrum. The effectiveness of the powered subwoofer directly correlates to the accuracy and impact of the bass frequencies. For example, if the subwoofer is not properly integrated or lacks sufficient power, the low-frequency response may be uneven, resulting in a boomy or muddy bass reproduction. Proper calibration and room placement are critical to realizing the full potential of the BP7006’s frequency response range.

In conclusion, the frequency response range is an essential characteristic of the Definitive Technology speakers BP7006, inextricably linked to its sonic performance and ability to reproduce audio with fidelity. The integrated powered subwoofer plays a crucial role in extending the low-frequency response, contributing to a more balanced and immersive listening experience. Understanding this relationship is vital for making informed decisions about speaker placement, system configuration, and overall expectations for audio reproduction quality. Any limitations in frequency response will inherently limit the realism and impact of the audio presentation.

4. Driver component composition

The driver component composition within the Definitive Technology speakers BP7006 is a critical factor influencing its sonic characteristics and overall performance. The materials, design, and configuration of the individual drivers directly determine the speaker’s ability to accurately reproduce audio signals across the frequency spectrum.

  • Tweeter Material and Design

    The tweeter, responsible for reproducing high-frequency sounds, often employs materials such as aluminum, silk, or synthetic fabrics. The BP7006 may utilize a specific tweeter design, like a dome or planar tweeter, selected for its ability to provide accurate and detailed high-frequency reproduction. For instance, an aluminum dome tweeter can offer a bright and precise high-end response, while a silk dome tweeter may provide a smoother and more laid-back sound signature. The choice of material and design impacts the speaker’s clarity, transient response, and dispersion characteristics.

  • Midrange Driver Material and Construction

    The midrange driver, responsible for the critical vocal and instrumental frequencies, plays a crucial role in the speaker’s overall tonal balance. Materials commonly used in midrange drivers include polypropylene, treated paper, or composite materials. The BP7006’s midrange driver likely employs a specific cone geometry and suspension system optimized for smooth and accurate reproduction of midrange frequencies. The driver’s construction influences its ability to deliver clear and natural vocals, as well as its ability to integrate seamlessly with the tweeter and woofer.

  • Woofer Material and Design (Main Drivers)

    The woofer is responsible for reproducing lower midrange and upper bass frequencies. Its material composition and design contribute significantly to the speaker’s transient response and overall tonal characteristics. Options for woofer composition includes polypropylene, treated paper, or more exotic materials like Kevlar. The BP7006’s woofers are designed to blend seamlessly with the powered subwoofer. For example, paper woofers might provide a warmer, more natural sound, while a polypropylene cone might be more durable and resistant to environmental factors.

  • Subwoofer Driver Materials and Enclosure

    The BP7006 integrated subwoofer driver material affects the speakers bass handling abilities. Depending on the materials, it will affect if the bass produced will be sloppy or concise. For example, depending on the type of bass people look for will be a deciding factor.

In conclusion, the driver component composition of the Definitive Technology speakers BP7006 is a complex interplay of materials, design choices, and engineering considerations. Each driver type is carefully selected and optimized to contribute to the speaker’s overall sonic performance. These choices reflect the manufacturer’s design philosophy and intended sound signature, ultimately impacting the listener’s audio experience.

5. Amplifier power rating

The amplifier power rating, expressed in watts, specifies the electrical power an amplifier can deliver to a speaker. In the context of the Definitive Technology speakers BP7006, this rating is crucial for ensuring optimal performance and preventing damage. The amplifier must be capable of providing sufficient power to drive the speaker’s drivers without clipping or distortion, particularly the integrated powered subwoofer. An underpowered amplifier will result in weak dynamics and a compressed sound, failing to exploit the speaker’s full potential. Conversely, an overpowered amplifier, if misused, can damage the drivers through excessive excursion. For example, attempting to reproduce loud, bass-heavy passages with an underpowered amplifier can cause the amplifier to clip, sending harmful signals to the speaker that can overheat and damage the voice coils.

The BP7006’s integrated powered subwoofer introduces a nuance to this relationship. The subwoofer section has its own dedicated amplifier. However, the main drivers still require amplification from an external source. The amplifier power rating for these main drivers should align with the speaker’s specified power handling capacity. Consider a scenario where the BP7006 has a recommended power handling range of 20-200 watts for the main channels. Employing an amplifier rated significantly below 20 watts would likely result in anemic sound reproduction, while consistently exceeding 200 watts could lead to driver damage, especially at high listening volumes. Proper matching ensures the speaker operates within its intended parameters, preserving sound quality and longevity.

In summary, the amplifier power rating is inextricably linked to the performance and reliability of the Definitive Technology speakers BP7006. Understanding the speaker’s power handling specifications and selecting an appropriately rated amplifier is essential for achieving optimal sound quality and preventing potential damage. Ignoring this factor compromises the listening experience and potentially shortens the speaker’s lifespan. The amplifier must be viewed as a crucial component, working in concert with the speaker to deliver the intended audio experience.

6. Cabinet construction material

The cabinet construction material significantly influences the acoustic performance of the Definitive Technology speakers BP7006. Material choice dictates the cabinet’s rigidity, damping properties, and resonant behavior, all of which directly affect sound quality. The selection of materials impacts the minimization of unwanted vibrations and resonances that can color the sound. For example, a cabinet constructed from low-density particleboard may exhibit more resonance than one made from higher-density medium-density fiberboard (MDF), leading to a muddier or less defined sound. The cabinet’s role is to provide a stable and inert platform for the drivers, allowing them to operate optimally without introducing extraneous noise or distortion.

The construction material also affects the speaker’s physical durability and aesthetic appeal. High-density MDF, a common choice for speaker cabinets, offers a good balance of rigidity, damping, and cost-effectiveness. The exterior finish, such as wood veneer or laminate, contributes to the speaker’s visual presentation and provides additional protection against environmental factors. The structural integrity of the cabinet is paramount, particularly given the BP7006’s bipolar design and integrated powered subwoofer, which generate significant internal pressure. For instance, if the cabinet is not adequately braced, it may flex or vibrate at high volumes, further compromising sound quality. High quality construction will minimize these effects.

In conclusion, the cabinet construction material is a critical determinant of the Definitive Technology speakers BP7006’s overall sonic and physical characteristics. Selection criteria prioritize rigidity, damping, and durability to minimize unwanted vibrations and ensure accurate sound reproduction. The material properties must complement the driver design and overall system configuration to achieve the intended performance goals. Understanding the relationship between cabinet material and speaker performance is vital for appreciating the engineering considerations behind the BP7006’s design. A well-constructed cabinet serves as a foundation for exceptional sound quality, enhancing the listening experience.

7. Room size compatibility

Room size compatibility is a critical consideration when deploying the Definitive Technology speakers BP7006. The speakers’ bipolar design, coupled with the integrated powered subwoofer, makes them particularly sensitive to room acoustics and dimensions. Implementing these speakers in a space too small can lead to excessive bass build-up and a blurred soundstage, negating the benefits of the bipolar radiation pattern. Conversely, placing the BP7006 in an excessively large room may result in a loss of sonic impact and insufficient bass reinforcement, diminishing the overall listening experience. The speaker’s design characteristics necessitate careful consideration of the room’s volume and dimensions to achieve optimal performance and balanced sound reproduction. As an example, a room with dimensions of 12ft x 15ft x 8ft might prove more suitable than an 8ft x 10ft x 8ft room due to the increased space for soundwave development and reduced potential for excessive bass reflections.

The interaction between the speakers and the room is paramount for achieving accurate sound reproduction. Smaller rooms often require careful attention to speaker placement and acoustic treatment to mitigate bass boom and standing waves. This can involve utilizing bass traps in corners and strategically positioning the speakers away from walls to minimize boundary reflections. Larger rooms might benefit from additional subwoofers to augment the BP7006’s integrated subwoofer, ensuring adequate low-frequency extension and impact throughout the listening area. The BP7006’s specifications, which include its frequency response range and power handling capabilities, should be considered in relation to the room’s acoustic properties. Failure to account for these factors can result in a compromised sonic performance, regardless of the speaker’s inherent capabilities.

In summary, room size compatibility is a decisive factor in realizing the full potential of the Definitive Technology speakers BP7006. The speakers’ bipolar design and integrated subwoofer necessitate careful consideration of room acoustics and dimensions to achieve balanced sound reproduction. Challenges arise in both small and large rooms, requiring strategic speaker placement, acoustic treatment, or supplementary subwoofers to optimize performance. The practical significance of understanding this relationship lies in ensuring that the BP7006 delivers the intended listening experience within the intended acoustic environment.

8. Impedance characteristics

Impedance characteristics represent a crucial electrical parameter of the Definitive Technology speakers BP7006, influencing the interaction between the speaker and the amplifier. Speaker impedance, measured in ohms, dictates the electrical load presented to the amplifier. A mismatch between speaker impedance and amplifier output can result in reduced power transfer, distortion, or even damage to either the amplifier or the speaker. The BP7006’s impedance rating must align with the amplifier’s output impedance capabilities to ensure efficient power delivery and optimal sound reproduction. A common scenario involves an amplifier designed for 8-ohm speakers connected to a 4-ohm speaker. This impedance mismatch can cause the amplifier to overheat or enter a protection mode, limiting its output power and potentially damaging its internal components.

The bipolar design and integrated powered subwoofer of the BP7006 introduce complexities to the impedance characteristics. While the main drivers present a specific impedance load to the amplifier, the integrated subwoofer utilizes its own internal amplifier and power supply, effectively decoupling it from the impedance considerations of the main drivers. This separation allows the amplifier to focus solely on driving the midrange and high-frequency drivers, potentially simplifying the impedance matching process. However, it remains imperative to verify the impedance rating of the BP7006’s main drivers and select an amplifier capable of providing adequate power at that impedance level. In situations where the amplifier’s power output is marginal relative to the speaker’s power handling capacity, the impedance characteristics become even more critical, as any impedance mismatch will exacerbate the power delivery limitations.

In summary, understanding the impedance characteristics of the Definitive Technology speakers BP7006 is essential for ensuring proper amplifier selection and system integration. The speaker’s impedance rating must be compatible with the amplifier’s output impedance capabilities to avoid impedance mismatch, prevent damage and facilitate optimal power delivery. The integrated powered subwoofer somewhat decouples the low-frequency section from this concern. A careful matching results in a more transparent and powerful reproduction. Failure to account for these impedance factors compromises sound quality and potentially leads to system instability or component failure, highlighting the practical significance of proper impedance matching.

9. Connectivity options (inputs)

Connectivity options represent the physical interfaces on the Definitive Technology speakers BP7006 that facilitate the transmission of audio signals from various sources. These inputs directly impact the speaker’s versatility and integration capabilities within a home audio system. The available connection types determine the range of compatible audio sources and the potential for achieving optimal audio quality.

  • Speaker-Level Inputs

    Speaker-level inputs, also known as high-level inputs, enable the BP7006 to receive audio signals directly from an amplifier’s speaker outputs. This connection type is useful in situations where a dedicated subwoofer output is unavailable or when integrating the BP7006 with older amplifiers. Connecting the BP7006 via speaker-level inputs allows it to derive its audio signal from the amplified output intended for the main speakers. This option ensures compatibility with a wider range of audio systems, particularly those lacking dedicated subwoofer pre-outs. It is, however, critical to properly match the polarity of the speaker wires (+ to + and – to -) to avoid phase cancellation issues.

  • Line-Level Inputs (RCA)

    Line-level inputs, typically in the form of RCA connectors, provide a direct connection to an amplifier’s or receiver’s line-level outputs, such as a subwoofer pre-out. This is generally the preferred method for connecting the BP7006, as it provides a cleaner and more direct signal path, bypassing the amplifier’s internal amplification stage. Utilizing the RCA inputs allows for independent control of the subwoofer’s volume and crossover frequency, enabling precise optimization of the bass response. This connection is optimal for systems with dedicated subwoofer outputs, ensuring a clear and unadulterated audio signal reaches the integrated subwoofer amplifier. It enables precise adjustment of the subwoofer’s levels relative to the main speakers for balanced audio reproduction.

  • LFE (Low-Frequency Effects) Input

    An LFE input is a specialized line-level input designed specifically for connecting to a receiver’s LFE output in a home theater system. This input receives only the low-frequency effects channel from movie soundtracks, allowing the BP7006 to reproduce dedicated bass content. This input is specifically designed to convey those explosive deep bass frequencies often found in films, allowing the BP7006 subwoofer amplifier to devote its entire attention to producing those low frequencies and effects.

The connectivity options available on the Definitive Technology speakers BP7006 dictate its compatibility with various audio sources and amplifier configurations. Choosing the appropriate input method ensures optimal signal transfer and allows for precise control over the speaker’s performance characteristics. These inputs enables full integration, from simple stereo setups to complex home theater environments.

Frequently Asked Questions

This section addresses common inquiries and clarifies key aspects regarding the Definitive Technology speakers BP7006. The information provided aims to enhance understanding of these speakers’ functionality and proper usage.

Question 1: What distinguishes the bipolar design of the Definitive Technology speakers BP7006 from conventional speakers?

The BP7006 employs a bipolar design, radiating sound from both the front and rear of the speaker cabinet. This contrasts with traditional speakers that primarily project sound forward. This configuration aims to create a wider, more immersive soundstage by utilizing room reflections, mimicking a live performance environment. Proper speaker placement is crucial to realizing the full benefits of this design.

Question 2: What is the purpose of the integrated powered subwoofer in the Definitive Technology speakers BP7006?

The integrated powered subwoofer is designed to reproduce low-frequency sounds, alleviating the need for a separate subwoofer unit. This feature simplifies setup and conserves space. The integrated design aims to provide a balanced and cohesive sound by seamlessly blending the low frequencies with the mid-range and high frequencies.

Question 3: What amplifier power rating is recommended for use with the Definitive Technology speakers BP7006?

The appropriate amplifier power rating depends on individual listening preferences and room size. However, it is generally recommended to select an amplifier that falls within the speaker’s specified power handling range. Using an amplifier that is significantly underpowered can result in distortion, while an overpowered amplifier can potentially damage the speakers if not used cautiously.

Question 4: What type of cabling is optimal for connecting the Definitive Technology speakers BP7006?

The selection of cabling depends on the specific connection being made. For speaker-level connections, quality speaker wire is recommended. For line-level connections, shielded RCA cables are advisable. The gauge of the speaker wire should be appropriate for the distance between the amplifier and the speakers. High-quality cables ensure optimal signal transfer and minimize potential signal degradation.

Question 5: How does room size influence the performance of the Definitive Technology speakers BP7006?

Room size significantly impacts the speaker’s performance due to the bipolar design. In smaller rooms, excessive bass buildup can occur, while in larger rooms, the sound may lack impact. Careful speaker placement and acoustic treatment can help mitigate these issues and optimize the speaker’s performance for the specific room dimensions.

Question 6: What maintenance is recommended for the Definitive Technology speakers BP7006?

Routine maintenance includes dusting the speaker cabinets and ensuring that all connections are secure. Avoid exposing the speakers to extreme temperatures or humidity. Periodic inspection of the speaker drivers for any signs of damage is also recommended. Adhering to these basic maintenance practices ensures the longevity and optimal performance of the speakers.

Key takeaways include understanding the importance of proper speaker placement, amplifier selection, and cabling to maximize the performance of the Definitive Technology speakers BP7006. Attention to these factors ensures optimal sound quality and long-term reliability.

The subsequent section will delve into potential troubleshooting steps for common issues encountered with the Definitive Technology speakers BP7006.

Definitive Technology Speakers BP7006

The following recommendations are intended to maximize the performance and longevity of the Definitive Technology speakers BP7006. Adherence to these guidelines will contribute to an enhanced audio experience and mitigate potential issues.

Tip 1: Optimal Speaker Placement is Critical. The BP7006’s bipolar design necessitates precise positioning within the listening environment. Maintain a minimum distance of two feet between the speakers and the rear wall to allow for proper soundstage development. Experiment with toe-in angles to fine-tune the imaging and reduce excessive brightness. Avoid placing the speakers in corners, as this can lead to exaggerated bass response.

Tip 2: Employ Proper Amplifier Matching. Select an amplifier with a power rating that aligns with the BP7006’s specified power handling capabilities. Underpowering the speakers will result in dynamic compression and potential distortion, while overpowering them can lead to driver damage. Ensure the amplifier’s impedance rating is compatible with the speaker’s impedance to facilitate efficient power transfer.

Tip 3: Calibrate the Integrated Subwoofer Judiciously. The BP7006’s integrated powered subwoofer offers independent level control. Begin with a neutral setting and gradually increase the subwoofer level until the bass frequencies are balanced with the mid-range and high frequencies. Avoid excessive boosting of the subwoofer, as this can mask other frequencies and create a boomy sound.

Tip 4: Implement Acoustic Treatment to Mitigate Room Reflections. Room acoustics significantly influence the perceived sound quality of any speaker system. Consider incorporating acoustic panels or bass traps to minimize unwanted reflections and standing waves. Strategically placed acoustic treatment can improve clarity, imaging, and overall sonic accuracy.

Tip 5: Utilize Quality Cabling for Optimal Signal Transfer. Employ high-quality speaker wire and interconnect cables to ensure clean and efficient signal transfer. The gauge of the speaker wire should be appropriate for the distance between the amplifier and the speakers. Shielded RCA cables are recommended for line-level connections to minimize noise and interference.

Tip 6: Regular Dusting and Cleaning Are Essential. Dust accumulation can negatively impact speaker performance and aesthetics. Periodically dust the speaker cabinets and drivers with a soft cloth. Avoid using harsh chemicals or abrasive cleaners, as these can damage the speaker’s finish.

Tip 7: Ensure Secure and Stable Speaker Placement. Verify that the speakers are placed on a stable and level surface to prevent vibrations and potential damage. Consider using speaker stands or isolation pads to further minimize unwanted vibrations and improve sonic clarity.

These strategies are designed to improve the listening experience and maintain the longevity of the BP7006. Through careful attention to speaker placement, amplifier selection, and room acoustics, the full potential of this speaker system can be realized.

The following segment will offer troubleshooting for standard issues associated with the Definitive Technology Speakers BP7006.

Conclusion

The preceding analysis has explored the defining characteristics, performance considerations, and practical implementation of Definitive Technology speakers BP7006. Key elements, including the bipolar radiation pattern, integrated powered subwoofer, and connectivity options, contribute to the speaker’s overall sonic signature and suitability for specific audio applications. The performance of this speaker model is contingent on careful attention to amplifier matching, speaker placement, and room acoustics.

The informed application of these principles will ensure optimal audio reproduction and a heightened listening experience. The BP7006, when correctly implemented, offers a robust solution. This model remains a relevant consideration for those seeking a balanced, powerful audio output.