![]() The IC-201 ($1,000 each) provides an ideal solution for creating true soundstage imaging where the only practical mounting option is in the ceiling. The combined low-pass response of the crossover and the drivers' acoustical rolloff is about –18 dB/octave.BG Radia launched a new LCR loudspeaker designed for high performance in-ceiling applications. The measurements here are for the movie mode with the crossover bypassed the music mode introduced a couple of very tiny changes in frequency response but, more important, brought the subwoofer's overall level down by about –5 dB. ![]() Close-miked frequency response shows a –3-dB point at 25 Hz. Using CEA-2010 measurement techniques, with four of the subwoofer modules lined up together, I got 110.1 dB from 40 to 63 Hz and 89.3 dB from 20 to 31.5 Hz. The BGX-S6B has the same general characteristics I measured in its big brother, the BGX-S12B: solid punch in the second octave of bass but much less output in the bottom octave. The impedance phase curves of both speakers are moderate, never exceeding –35°. This is helped by the ribbon drivers, whose impedance runs fairly high and mostly flat. As is often the case with complicated, multipolar arrays, the response varied considerably at different angles.īoth speakers will be easy for practically any amplifier to drive because their sensitivity is high - in the low-90-dB range - and their impedance curves never dip very low. The averaged measurements showed a lot of treble rolloff. The SS-303's measurements were pretty jagged, as you might expect from the multidirectional driver array. The curve looked similar but tilted down on the right (treble) side I calculated ☑3.9 dB from 55 Hz to 20 kHz. In case you're curious how it measured from 2 meters, the treble rolloff was much more extreme. Off-axis response was great: At 45° and 60° off-axis, it looked quite similar to what you see here, just with more treble rolloff and the flattening of that peak at 11 kHz. There's a broad dip centered at 1.3 kHz, with small response peaks centered at 2.2, 3.7, 5.8, and 11 kHz. As I suggested, it's not as bass-heavy in a normal application as it appears in this graph. Given the measurement difficulties, the LA-550's frequency response looks fairly smooth. The LA-550 and SS-303 responses are normalized to 0 dB at 1 kHz, the subwoofer normalized so that its peak response shows as +3 dB. Again, measurements were made with the grille in place and using a BG-supplied enclosure with foam attached to the corners. ![]() The LA-550 was mounted in one of the enclosures BG supplied, with foam attached to the corners to prevent diffraction.įor the SS-303, I was able to run measurements much the same way I usually do with a multipolar surround speaker: averaged quasi-anechoic response at 2 meters from 0° to 60°, smoothed to 1/12 octave and spliced at 400 Hz to a close-miked measurement of the woofers. I ran all measurements with the grille in place. The splice point was 600 Hz, much higher than the normal ~240 Hz because of the greater measurement distance. Take these measurements as an approximation.įor this speaker, I spliced the close-miked response of the woofers to the quasi-anechoic measurements of the speaker, averaged from 0° to 30° off-axis and smoothed to 1/12 octave. As a result, the speaker probably shows more treble rolloff than you'd hear in a normal installation. So I ran them at 3 meters, the farthest I could get the speaker from the mike while still being able to remove reflections off nearby objects from the response. It's not practical with my equipment setup and available space to run measurements at this distance. The BG LA-550 proved extremely difficult to measure because its long driver array doesn't really "add up" acoustically until you're about 15 feet away. Sensitivity (SPL at 1 meter with 2.8 volts of pink-noise input)īass output, subwoofer (CEA-2010 standard) There's no denying that it's a niche product, but if you're in that niche, it's something you should hear. In the right setting - a very large living room or custom home theater with the wall space to accommodate 6-foot-high speakers - the LA-550/SS-303 combo delivers some of the finest movie sound you'll hear outside of, say, the Mann Village Theater in Los Angeles.
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