Q Acoustics Q SUB80 Active Subwoofer at Vinyl Sound Buffalo NY USA

The Q Acoustics Q SUB80 is an 8-inch active sealed subwoofer from Q Acoustics (United Kingdom), available at Vinyl Sound USA Inc. in Buffalo, NY. The most compact model of the Q SUB series, the Q SUB80 houses a 203 mm paper-cone driver with a 38 mm aluminium voice coil and demodulation ring in an 18 mm high-density MDF infinite baffle enclosure with a 36 mm double-thickness baffle and internal dart bracing, measuring just 315 x 315 x 347 mm and weighing 15 kg. A custom-designed PBTL Class D amplifier delivers 400 watts peak and 200 watts continuous power with THD below 0.1%, extending frequency response to 36 Hz at a maximum SPL of 107 dB at 1 metre. On-board DSP provides a low-pass crossover adjustable from 50 Hz to 250 Hz, dual phase and delay controls, automatic input signal detection, and a phase inversion switch. Q Acoustics specifically recommends the Q SUB80 as the ideal partner for the M20 HD and M40 HD powered speaker systems, and for 3000c and 5000 series theater packs in single or dual subwoofer configurations.

203 mm Driver, PBTL Amplifier, and Compact Sealed Cabinet

The Q SUB80's 203 mm paper-cone driver uses a heavy-duty steel chassis, rubber surround, and 38 mm voice coil with an aluminium demodulation ring that reduces inductance-induced modulation distortion at high drive levels. The custom PBTL amplifier module operates four Class D stages in a parallel bridge-tied load configuration that bridges and parallels two amplifier pairs simultaneously, reducing output impedance, increasing current delivery capability, and improving efficiency relative to a single bridged design. At 400 watts peak and 200 watts continuous, the Q SUB80 amplifier is significantly more powerful than its 8-inch cabinet size would suggest, and the THD below 0.1% at rated continuous power confirms that this power is delivered cleanly throughout the driver's excursion range. The sealed 13.9-litre infinite baffle enclosure is the physically smallest cabinet in the Q SUB series while sharing the same 18 mm high-density MDF wall thickness, 36 mm double-thickness front baffle, and dart internal bracing found in the Q SUB100 and Q SUB120, ensuring the same structural rigidity and resistance to cabinet ballooning under sustained high-output operation.

DSP Integration, Source Detection, and Flexible Placement

The Q SUB80 carries the complete DSP integration system shared across the Q SUB series. Automatic source detection identifies whether the incoming line-level signal is stereo or mono and adjusts system gain accordingly, ensuring optimal signal-to-noise ratio from stereo preamp outputs, AV receiver mono LFE feeds, and powered speaker line outputs without manual intervention. Dual delay controls allow time alignment of the subwoofer relative to the main speakers regardless of physical placement distance, and the continuously variable low-pass crossover from 50 to 250 Hz accommodates integration with both compact bookshelf speakers with high bass roll-off points and the Q Acoustics M20 HD and M40 HD powered systems whose subwoofer output is a dedicated line-level feed. The phase inversion switch handles the 0 and 180-degree phase relationship between the Q SUB80 and the main system. The sealed portless cabinet allows placement near walls and in corners with less susceptibility to boundary-induced bass bloom than ported designs of equivalent driver size, a practical advantage when integrating a compact subwoofer into a small room system based around the M20 HD or M40 HD.

Key Features

• 203 mm Paper-Cone Driver: An 8-inch driver with steel chassis, rubber surround, and 38 mm voice coil delivers bass extension to 36 Hz at 107 dB maximum SPL in a compact sealed cabinet suited to small and medium rooms.
• Aluminium Demodulation Ring: A demodulation ring on the pole piece reduces inductance-induced modulation distortion at high excursion, maintaining bass clarity and low THD under sustained output conditions.
• PBTL Class D Amplifier: Four digital amplifier stages in a parallel bridge-tied load configuration deliver 400 watts peak and 200 watts continuous with THD below 0.1%, providing strong dynamic headroom relative to cabinet size.
• DSP Room Integration System: On-board DSP with dual delay and phase controls, phase inversion switch, and automatic input signal detection enables flexible subwoofer integration without professional installation.
• Variable Low-Pass Crossover: A continuously adjustable low-pass filter from 50 to 250 Hz integrates with compact bookshelf speakers, powered systems such as the M20 HD and M40 HD, and any other partnering loudspeaker.
• Automatic Source Detection: DSP identifies stereo or mono input signals and adjusts system gain automatically for optimal performance from any source type.
• Sealed Infinite Baffle Design: A portless sealed enclosure delivers tight, focused bass and easier near-wall and corner placement compared to ported subwoofers of equivalent driver size.
• Compact Cabinet: At 315 x 315 x 347 mm and 15 kg, the Q SUB80 is the most placement-flexible model in the Q SUB series, suited to small rooms, secondary systems, and desktop environments.
• Two Classic Finishes: Available in Satin Black with a black grille or Satin White with a grey grille.

Technical Specifications

Frequently Asked Questions

What is the Q Acoustics Q SUB80?

The Q Acoustics Q SUB80 is an 8-inch active sealed subwoofer from Q Acoustics, UK, and the most compact model of the Q SUB series. It houses a 203 mm paper-cone driver with a 38 mm aluminium demodulation ring voice coil in a 13.9-litre infinite baffle cabinet measuring 315 x 315 x 347 mm. A PBTL Class D amplifier delivers 400 watts peak and 200 watts continuous with THD below 0.1%, and DSP provides a variable 50 to 250 Hz low-pass crossover, dual delay and phase controls, and automatic source detection. Frequency response extends to 36 Hz at 107 dB maximum SPL. Q Acoustics recommends it as the ideal partner for the M20 HD, M40 HD, and 3000c and 5000 series theater packs.

How does the Q SUB80 compare to the Q SUB100 and Q SUB120?

All three Q SUB models share the same sealed infinite baffle design, PBTL Class D amplifier architecture, and DSP integration system. The Q SUB80 uses a 203 mm eight-inch driver, extends to 36 Hz, and delivers 400 watts peak at 107 dB maximum SPL from the smallest cabinet at 315 x 315 x 347 mm. The Q SUB100 uses a 254 mm ten-inch driver extending to 32 Hz at 111 dB from a mid-sized cabinet, and the Q SUB120 uses a 305 mm twelve-inch driver with a 50 mm voice coil extending to 28 Hz at 114 dB from the largest cabinet. The Q SUB80 is Q Acoustics' recommended partner for compact systems including the M20 HD and M40 HD powered speakers and 3000c and 5000 series theater configurations, while the Q SUB100 and Q SUB120 are suited to larger rooms and higher-output passive speaker systems.

How does the Q SUB80 compare to the SVS SB-1000 and the BK Electronics XXLS400-DF?

The Q Acoustics Q SUB80 competes in the compact sealed subwoofer category alongside the SVS SB-1000 and the BK Electronics XXLS400-DF. The SVS SB-1000 uses a 12-inch driver in a sealed enclosure with 300 watts RMS amplification, extending to 20 Hz at -6 dB in a 29 cm cube cabinet — a larger cabinet with a larger driver than the Q SUB80. The BK Electronics XXLS400-DF uses a forward-firing ported design with 400 watts amplification, sacrificing the portless near-wall placement advantage of the sealed Q SUB80. The Q SUB80's PBTL amplifier architecture and aluminium demodulation ring driver are engineering advantages not present in either competitor, and the DSP delay controls allow time alignment flexibility that neither the SVS SB-1000 nor the BK Electronics model provides at equivalent pricing.

Can the Q SUB80 be used with the Q Acoustics M20 HD and M40 HD powered speaker systems?

Yes. Q Acoustics specifically recommends and designed the Q SUB80 as the ideal subwoofer partner for the M20 HD and M40 HD powered systems. Both powered systems include a dedicated subwoofer line output rated at 1 V RMS maximum, which connects directly to the Q SUB80's line-level RCA input. The Q SUB80's variable low-pass crossover from 50 to 250 Hz is set to pick up where the M20 HD or M40 HD's bass roll-off begins, and the DSP delay control compensates for any placement distance difference between the subwoofer and the powered speakers. In a 2.1 configuration with either M system, the Q SUB80 extends the combined system's bass response to 36 Hz without requiring any additional electronics.

Is the Q SUB80 suitable for a small apartment or second-room system?

Yes. The Q SUB80's 315 x 315 x 347 mm cabinet and 15 kg weight make it the most practical Q SUB model for small apartments, secondary listening rooms, and spaces where a larger subwoofer is impractical. The sealed portless design is more forgiving of near-wall and corner placement than ported alternatives, reducing the need for precise subwoofer positioning in constrained room layouts. The 107 dB maximum SPL and 36 Hz extension are more than sufficient for music listening and cinema use in small to medium rooms, and the DSP integration controls ensure clean integration with whatever speaker system is already in place.

Where can I buy the Q Acoustics Q SUB80 in Buffalo or Western New York?

The Q Acoustics Q SUB80 Active Subwoofer is available at Vinyl Sound USA Inc., an authorized Q Acoustics dealer in Buffalo, NY, serving audiophiles across Western New York and the greater Buffalo region. Vinyl Sound can assist with subwoofer integration, system matching for M20 HD and M40 HD setups, and complete home theater consultation in-store or by appointment.