Сабвуферы — Mission QX-12 Sub

The QX-12 Sub was the powered bass unit for the first-generation QX range by the British maker Mission, built to add low bass to both hi-fi and home cinema systems made up of the QX standmount, floorstanding and centre models. It houses a single 12 inch driver and a built-in amplifier in a front-ported cabinet, and it was offered in Lux Black, Lux White and a walnut pearl finish to match the rest of the range. Mission later replaced it with the QX-12SUB MKII, which keeps the same amplifier rating and driver size.

Key specs that matter

Mission specifies a 300 mm long-throw cone. Its internal amplifier is rated at 300 W continuous and 450 W peak, and the input sensitivity is 200 mV for 150 W. Frequency response is listed as 30 Hz to 150 Hz within 3 dB, and the low-pass crossover covers the same 30 Hz to 150 Hz span. Average maximum output reaches 118 dB at 1 m, and signal-to-noise is 85 dB. Line and LFE inputs present 10 kohm and 5 kohm. The enclosure measures 420 mm high plus 58 mm for the feet, 400 mm wide and 450 mm deep plus 15 mm at the rear panel, and it weighs 23 kg.

Engineering and use context

The driver is part of the DiaDrive system that Mission also uses in its QX speakers. Its main diaphragm is a seam-free curvilinear cone made from a blend of soft pulp and acrylic fibre, and a second, stiff conical support has an enlarged area of contact with the voice coil to speed up the transient response. Around the front of the driver, a comb-tooth trim hides the surround and the fixing screws. The reflex vent sits on the front face of the box instead of the rear, and rubber feet keep the cabinet in firm contact with the floor. Controls cover crossover frequency, level and phase inversion, while automatic switching wakes the amplifier once a signal is detected. Connections consist of two RCA line inputs for left and right plus one RCA jack for the mono LFE channel.

Pairing

The natural partners are the QX bookshelf and tower models in a 2.1 or 5.1 layout, with its LFE jack wired to the sub pre-out on a surround receiver. In a stereo system without a sub output, the stereo line input can take a split signal from preamp outputs, as the unit has no speaker-level connections. With its filter reaching down to the bottom of its range, it can also sit under floorstanders that already reach deep, filling in only the bottom octave.

Alternatives

The Mission ZX-12 Sub is the equivalent model from the ZX series, sharing the amplifier ratings but quoted at 35 Hz to 120 Hz.