Placement in a room can impact sound arrival timing, while phase alignment issues can arise even with adjacent subwoofer placement, affecting system frequency response. The Q SUB range uses Digital Signal Processing (DSP), alongside fine delay adjustments and phase inversion switch, to address these integration challenges. This technology enables users to optimise settings for a class-leading performance, ensuring seamless integration with other speakers without needing professional installation.
Subwoofers must accommodate a wide variety of sound input sources, including stereo preamp outputs or mono feeds from active speakers or home cinema systems. The Q SUB range uses a complex algorithm inside the DSP to identify the input signal type – stereo or mono and the level – and automatically adjusts system gain. This ensures optimal signal to noise levels and dynamic range, enhancing performance regardless of the connected source.
The Q SUB amplifier module, custom-designed by Q Acoustics, includes a DSP, power amplifier, and power supply. It features four digital power amplifier stages in a parallel bridge-tied load (PBTL) configuration, enhancing efficiency and speaker control by reducing output impedance and heat dissipation. This design can deliver up to 300W continuous and 600W peak power, with exceptional total harmonic distortion (THD) performance of less than 0.1% up to 300W.
Subwoofers need an adjustable low pass filter to match their upper frequency response with the diminishing bass of other speakers. The Q SUB range features a low pass filter with frequency adjustment from 40 Hz to 250 Hz, setting the -6 dB point. This wide range ensures the Q SUB models can seamlessly integrate with and complement the low-frequency response of any partnering speaker system.
The drive units feature a heavy-duty steel chassis, paper cone, and rubber surround. Bass unit diameters are 203mm (Q SUB80), 254mm (Q SUB100), and 305mm (Q SUB120). Voice coils are 38mm for Q SUB80/100 and 50mm for Q SUB120, with an aluminium demodulation ring for reduced inductance-induced modulation distortion.
Cabinet design
An infinite baffle (sealed box) design delivers tight, focused bass, coupled with DSP for precise acoustic tuning. With no port, placement near walls and furniture is easier. The Q SUB cabinets use 18mm high-density MDF with a 36mm double-thickness baffle for rigidity. Internal dart bracing enhances stability, reduces cabinet ballooning, and ensures optimal performance under high internal pressure.
- Enclosure type: Infinite baffle
- Bass unit diameter: 305 mm (12 in)
- Effective volume: 44.1 litres
- Max SPL @ 1 m: 114 dB
- Frequency response (-6dB): 28 Hz – 250 Hz
- Low pass crossover range: 40 Hz – 250 Hz
- Peak amplifier power: 600 W
- Continuous amplifier power: 300 W
- THD @ rated power: 0.09%
- Input sensitivity (max gain): 300 mv rms
- Maximum input level: 2.1 V rms
- Input impedance: 20 kΩ
- Noise floor (A wtd): 50 μV
- Dimensions (HxWxD): 400 x 400 x 432 mm
- Weight (per loudspeaker): 22.5 kg
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