![]() I’d guess that at least another 10dB would have to come off its level for proper balance. With the subwoofer turned down to -10dB and the other speakers to +10dB, it was still far too loud. I had planned on using the ‘Bypass’ mode of the amp, cutting out its own built in attenuator and the variable low pass filter, leaving just the fixed low pass filter in place however, this also left the system’s level way too high for the Yamaha receiver’s (and I’d guess, most other brand’s) speaker adjustment range. Instead I put the subwoofer in the same corner I use for all subwoofers, which has proven over the years to lead to a smooth and powerful performance. I confess that I wasn’t quite prepared to do a proper installation of the subwoofer, since that would involve cutting holes in my office. These reduce the bass load on any speakers further down the line. The outputs have a gentle (6dB per octave) high pass filter set to 150Hz and 200Hz respectively. And stereo line level and speaker level outputs as well. There are stereo line level and speaker level inputs. There’s also a phase reversal switch, plus you can choose to have the unit switch on and off automatically, or do it manually.Īround the back is a single pair of binding post outputs for the subwoofer. A bypass switch can cut both the level control and the variable low pass filter out of the circuit. It also has an additional variable low pass filter which can be adjusted to between 40Hz and 150Hz, plus a level control. That is, it cannot be repurposed as a full range amplifier. It has a fixed 150Hz low pass filter built in. A mono unit, it is rated at 90W output into 4Ω. The Sonamp A150 is specifically designed for the purpose. Of course Sonance has available a suitable amplifier to drive the subwoofer. So typically you will be using one of the voice coils. The installation instructions make clear that if provided with the mono signal, it should not be wired in parallel (i.e. ![]() The driver has two voice coils and is provided with two sets of binding posts, one set for each of the voice coils, because it is a passive subwoofer (i.e. You can instead go for 6” round, or change the look to 4” square or 6” square. The kind of default ‘finish’ consists of a 4” collar and round perforated grille. There are a choice of collars and grilles. Its end is clamped into a collar which is installed in the wall. It is a bandpass design, which means that the 203mm driver is entirely contained within the enclosure, which is sealed apart from the port through which the sound is emitted. The subwoofer is in fact a good-sized box – 235mm by 313mm by 610mm – but it is designed to be hidden in a ceiling (or, I’d guess, under the floor). Of course, you cannot produce bass from nothing. That, incredibly, is what the Sonance BPS8 subwoofer promises: strong deep bass with effectively no physical presence. Unless, that is, you can somehow reduce it to appearing as just another 175mm diameter perforated grille on the wall. Subwoofers are big lumps of things that can easily spoil the décor of any room. It’s all well and good installing high quality, virtually invisible loudspeakers in your walls and ceilings, but what do you do about the bass? ![]() A removable grille over the port will keep the enclosure free of foreign objects.The invisible speaker market is well established, but what about invisible subwoofers? Stephen Dawson looks at one such offering from market leader Sonance. This will allow the product to be used in a variety of installation locations, while ensuring optimum sonic performance. Installers can unscrew the port from the front of the cabinet, then unscrew a blanking plate from the side, and swap them. One of the most unique and versatile features of the PS-S210SUBT, according to the company, is its ability to port either from the front or the side of the enclosure. This allows it to be used in a wide range of specialty applications such as under restaurant booths or banquets (using the included feet), or mounted onto the side of rafters, on walls or under ceilings (with the optional C-bracket). The polyurethane-coated, laminated-plywood enclosure features a shallow design, with dimensions of 8.98-inches H x 33-inches W x 13.78-inches D. The What Else: The PS-S210SUBT utilizes all-new 2 x 10-inch low-profile, high excursion drivers, that were specifically engineered in-house by Sonance for this product.
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