Напольная акустика — Acora Acoustics BedRock

BedRock is the powered bass module in the Acora Acoustics catalogue and the only subwoofer the Toronto company currently lists. Acora, a firm of about nine people, builds every enclosure from stone, and founder Valerio Cora developed his own machinery to cut slabs with hidden mitre joints and smooth edges. The unit is meant to work with Acora's own speakers rather than as a generic home theatre sub - it doubles as a stand for the SRB and QRB stand-mounts and adds low bass under the SRC-1 and SRC-2.

Key specs that matter

BedRock follows a one-way layout with a single 12 inch sandwich paper cone driven by a built-in 500 W amplifier. Acora gives the frequency range as 18 Hz to 100 Hz, the efficiency as 90 dB at 1 W and 1 m, and the driver impedance as 4 ohm. The cabinet is 40.6 cm wide, 35.6 cm deep and 73.7 cm high, and one BedRock weighs around 47.6 kg, the exact figure depending on the stone. Finishes include Nero Assoluto black granite, Mystic granite in a salt and pepper pattern, Thassos White Quartz, Nardo Grey Quartz, amethyst and Lilac Marble, the last at extra cost.

Engineering and use context

As with the rest of the range, the walls are 2 cm slabs of polished granite or another stone, chosen for stiffness, mass and resistance to vibration. Because the driver has its own amplification, the passive stand-mount above it no longer has to reproduce the deepest octaves. With an SRB or QRB sitting on top, a pair of BedRock units forms a three-way floor-standing system in which the paper cone woofer of the small speaker handles bass and midrange, the beryllium dome covers the treble and the subwoofer takes the range below. Stacked this way, the stone module takes the place of the separate SRS stand, so no extra floor space is needed for the subwoofer. Acora states that the combination extends response into the deep bass and is intended for a range of room types.

Pairing

Natural partners are the SRB and QRB, which sit directly on the module, and the SRC-1 and SRC-2 floor-standers, next to which BedRock works as a separate low-bass cabinet. With amplification on board, the main stereo amplifier only drives the upper speakers. Matching the stone of the module to that of the speakers keeps the stack visually uniform, and Acora offers the same granite and quartz colours across both.

Alternatives

Acora currently offers no second subwoofer or bass module besides the BedRock.