Сабвуферы — KEF T2

The T2 is the powered subwoofer of the KEF T Series, a home theatre range built around loudspeakers with an unusually slim profile. It follows the same slim theme, with a cabinet roughly half the thickness of competing subwoofers. The UK price was GBP 499, and gloss black and gloss white finishes have been listed.

Key specs that matter

A single 250 mm (10-inch) driver works in a closed enclosure driven by a 250 W Class D amplifier. The quoted frequency range is 30 Hz to 250 Hz, and maximum output is given as 110 dB SPL. The box is 380 mm high, 370 mm wide and 177 mm deep and weighs 13 kg. There is one RCA line input for a mono or LFE signal, and the mains supply accepts 100 to 240 V at 50 or 60 Hz. Standby draw is 0.5 W.

Engineering and use context

The shallow depth is the point of the design, since it lets the T2 stand against a wall, slide behind a sofa or sit in narrow gaps where a cube-shaped subwoofer will not fit. KEF chose a sealed cabinet over a ported one for accuracy and quick response, and the driver works behind a fixed low-pass filter at the top of its range. The rear panel is deliberately simple. A Bass Boost switch adds 0, +6 or +12 dB at around 40 Hz, a phase switch selects 0 or 180 degrees, and an Auto or Manual switch decides whether the unit waits in standby until a signal arrives or stays on permanently. A separate on and off switch acts as a vacation switch, and an indicator glows blue when the amplifier is running and red in standby. The T2 has no level knob of its own and no variable crossover, so output level and the crossover point are set in the source equipment. KEF's manual suggests trying the 180 degree phase position when the subwoofer sits far from the satellite speakers, as more output can sometimes be gained that way.

Pairing

The T2 is meant to hang off the LFE subwoofer output of an AV amplifier or receiver. KEF recommends setting the subwoofer crossover in the receiver to 120 Hz and configuring the satellites accordingly in its speaker menu, which suits small wall-mounted or thin speakers like the rest of the T Series. With a stereo amplifier it needs a preamplifier or subwoofer output that offers its own level and bass management, because the T2 has no speaker-level inputs.

Alternatives

The KEF KC62 is a subwoofer of a different design, placing two force-cancelling 6.5-inch drivers and 1,000 W RMS of amplification in a 246 x 256 x 248 mm aluminium cabinet.