Q Acoustics Q SUB100 Active Subwoofer at Vinyl Sound Buffalo NY USA

The Q Acoustics Q SUB100 is a 10-inch active sealed subwoofer from Q Acoustics (United Kingdom), available at Vinyl Sound USA Inc. in Buffalo, NY. The mid-range model of the Q SUB series, the Q SUB100 houses a 254 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. A custom-designed PBTL Class D amplifier module delivers 500 watts peak and 250 watts continuous power with THD below 0.1% at rated output. On-board DSP provides a low-pass crossover adjustable from 40 Hz to 250 Hz, dual phase and delay controls, automatic input signal detection, and a phase inversion switch, delivering frequency response down to 32 Hz with a maximum SPL of 111 dB at 1 metre. Q Acoustics specifically recommends the Q SUB100 as the ideal low-frequency partner for its Concept loudspeaker series and medium-sized passive speakers across the full Q Acoustics lineup.

254 mm Driver, 38 mm Voice Coil, and PBTL Amplifier Architecture

The Q SUB100's 254 mm paper-cone driver uses a heavy-duty steel chassis, a rubber surround, and a 38 mm voice coil with an aluminium demodulation ring on the pole piece. The demodulation ring reduces inductance-induced modulation distortion — the nonlinear mechanism by which voice coil inductance variation with excursion produces harmonic and intermodulation artifacts at high drive levels — maintaining low distortion figures across the SUB100's operating range. The custom-designed amplifier module uses four Class D digital power amplifier stages in a parallel bridge-tied load PBTL configuration, a topology that parallels two bridged amplifier pairs to reduce output impedance, increase current delivery, improve efficiency, and decrease heat dissipation relative to a conventional bridge amplifier. The 500-watt peak and 250-watt continuous rating is matched to the 10-inch driver's mechanical limits and provides substantial dynamic headroom for both music transients and cinema LFE content, while the THD specification of below 0.1% at rated continuous power confirms the amplifier's cleanliness throughout its operating range.

Sealed Infinite Baffle Cabinet, DSP Integration, and Source Detection

The Q SUB100's sealed infinite baffle enclosure delivers the tight, focused bass response and gradual low-frequency roll-off associated with sealed subwoofer designs, without the port noise, port resonance, or driver unloading artifacts of ported alternatives. The absence of a port also makes near-wall and corner placement more practical, as the sealed cabinet's acoustic behavior is less sensitive to boundary reinforcement effects than ported enclosures. The 18 mm high-density MDF cabinet walls and 36 mm double-thickness front baffle provide the structural rigidity required to resist the high internal pressure generated by a 500-watt peak amplifier driving a sealed enclosure. Internal dart bracing prevents cabinet wall ballooning under sustained high-output operation and reduces panel resonances. The DSP integration system provides automatic source detection that identifies stereo or mono input signals and adjusts system gain accordingly, along with dual delay controls for time alignment relative to the main speakers, a continuously variable 40 to 250 Hz low-pass crossover, and a phase inversion switch for 0 or 180-degree phase selection.

Key Features

• 254 mm Paper-Cone Driver: A 10-inch driver with steel chassis, rubber surround, and 38 mm voice coil delivers bass extension to 32 Hz at 111 dB maximum SPL, suited to medium to large rooms and demanding home cinema systems.
• Aluminium Demodulation Ring: A demodulation ring on the pole piece reduces inductance-induced modulation distortion at high excursion levels, maintaining bass clarity and low THD under sustained high-output conditions.
• PBTL Class D Amplifier: Four digital amplifier stages in a parallel bridge-tied load configuration deliver 500 watts peak and 250 watts continuous with THD below 0.1%, combining high efficiency with strong current delivery capability.
• DSP Room Integration System: On-board DSP with dual delay and phase controls, phase inversion switch, and automatic input signal detection enables owner-adjustable subwoofer-to-main-speaker integration without professional installation.
• Variable Low-Pass Crossover: A continuously adjustable low-pass filter from 40 to 250 Hz integrates seamlessly with any partnering loudspeaker system from large floorstanders to compact bookshelf speakers.
• Automatic Source Detection: DSP identifies stereo or mono input signals and adjusts system gain automatically for optimal signal-to-noise ratio from any source type.
• Sealed Infinite Baffle Design: A portless sealed enclosure delivers tight, focused bass, easier near-wall placement, and a lower noise floor free from port turbulence compared to ported designs of equivalent driver size.
• 18 mm MDF Cabinet with 36 mm Double-Thickness Baffle: High-density MDF walls, a doubled front baffle, and internal dart bracing suppress cabinet resonance and prevent ballooning under high internal pressure.
• Two Classic Finishes: Available in Satin Black with a black grille or Satin White with a grey grille for discreet or complementary placement in any interior environment.

Technical Specifications

Frequently Asked Questions

What is the Q Acoustics Q SUB100?

The Q Acoustics Q SUB100 is a 10-inch active sealed subwoofer from Q Acoustics, UK, and the mid-range model of the Q SUB series. It houses a 254 mm paper-cone driver with a 38 mm aluminium demodulation ring voice coil in an 18 mm high-density MDF infinite baffle enclosure with dart internal bracing. A PBTL Class D amplifier delivers 500 watts peak and 250 watts continuous with THD below 0.1%, and DSP provides a variable 40 to 250 Hz low-pass crossover, dual delay and phase controls, and automatic source detection. Frequency response extends to 32 Hz at 111 dB maximum SPL.

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

All three Q SUB models share the same sealed infinite baffle design, PBTL Class D amplifier topology, DSP integration system, and sub-0.1% THD specification. The Q SUB80 uses a 203 mm eight-inch driver, extends to 36 Hz, and delivers 300 watts peak at 109 dB maximum SPL in a smaller cabinet. The Q SUB100 uses a 254 mm ten-inch driver, extends to 32 Hz, and delivers 500 watts peak at 111 dB. The Q SUB120 uses a 305 mm twelve-inch driver with a larger 50 mm voice coil, extends deepest to 28 Hz, and delivers 600 watts peak at 114 dB. Q Acoustics specifically recommends the Q SUB100 as the ideal partner for Concept series loudspeakers and medium-sized passive speakers, making it the natural choice for Q Acoustics Concept 300, Concept 50, and 5000 series system integration.

How does the Q SUB100 compare to the SVS SB-1000 Pro and the REL T/7x?

The Q Acoustics Q SUB100 competes with the SVS SB-1000 Pro and the REL T/7x in the premium sealed 10-inch subwoofer category. The SVS SB-1000 Pro uses a 10-inch driver with 325 watts RMS Sledge amplification and app-based DSP control, extending to 20 Hz at -6 dB. The REL T/7x uses a 10-inch driver with 200 watts Class D amplification in a ported forward-firing enclosure with REL's high-level speaker cable input as its primary connection. The Q SUB100 outpowers both competitors with 500 watts peak and 250 watts continuous, adds dual delay controls for time alignment not available on the REL T/7x, and matches the DSP integration capability of the SVS at a comparable price point. The sealed cabinet and Q Acoustics system voicing make the SUB100 particularly cohesive when partnered with Q Acoustics passive loudspeakers.

What Q Acoustics speakers is the Q SUB100 designed to complement?

Q Acoustics specifically recommends the Q SUB100 as the ideal partner for its Concept series loudspeakers and medium-sized passive speakers across the Q Acoustics lineup. In practice this includes the Concept 300 bookshelf, Concept 30, Concept 50, and the 5020 and 5040 models, all of which benefit from bass extension below their natural roll-off points. The variable 40 to 250 Hz crossover range accommodates the different bass extension characteristics of each model, and the DSP delay controls ensure time alignment regardless of where the subwoofer is placed relative to the main speakers in the room.

Does the Q SUB100 require a subwoofer output from the amplifier or AV receiver?

The Q SUB100 accepts any line-level signal at its RCA inputs, including a dedicated subwoofer pre-out from an AV receiver, a stereo line-level output from a preamplifier or integrated amplifier, or a mono line output from a powered or active speaker. The automatic source detection DSP identifies whether the incoming signal is stereo or mono and adjusts system gain accordingly, so the same input circuitry accommodates both stereo preamp outputs and dedicated mono LFE feeds without manual gain adjustment. For stereo amplifiers without a dedicated subwoofer output, the Q SUB100's 40 to 250 Hz low-pass crossover is set on the subwoofer itself, and the main speakers handle everything above the selected crossover frequency.

Where can I buy the Q Acoustics Q SUB100 in Buffalo or Western New York?

The Q Acoustics Q SUB100 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, crossover and delay setup, and complete system consultation in-store or by appointment.