subwoofer amp with crossover/phase control
parts express sells a decent one - it's actually used in the "Storm" subwoofer array system. https://www.parts-express.com/dayton-audio-sa1000-subwoofer-amplifier-rack-mountable--300-811 |
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Check with Danny at GR Research he is the supplier of the amps that Rythmik uses for their subs. http://gr-research.com/a370peq.aspx |
Actually @jackd, you have it backwards. Brian Ding of Rythmik Audio designed the patented Direct Servo-Feedback circuit and amplifier found in the Rythmik plate amps, and has those plate amps manufactured in China. They all come into the U.S. through Rythmik, Brian then sending Danny Richie of GR Research some to sell with his sub kits. Danny was already offering a sub kit when he learned of Brian and his new Servo-Feedback design. It occurred to Danny that Brian’s S-F circuit combined with Danny’s idea for an OB/Dipole sub would produce a new state-of-the-art sub. They got together (both are located in Texas) and came up with the finished design of an OB/Dipole sub, as well as some sub drivers. Brian offers complete subs (sealed and ported) and the OB/Dipole Sub kit, Danny DIY sub (sealed and the OB/Dipole) kits only, as well as many loudspeaker kits. |
@ricred1 The slope is to match the roll-off of your speakers. Ported and passive radiator speakers roll-off at 24dB/oct, sealed speakers at 12dB/oct. After finding what frequency you want to cross over at (80Hz for instance), next you find the phase; play a sine wave at the frequency you cross over at, you can find clips on YouTube or on websites (like this one), and adjust your phase/polarity until it registers the loudest in the seating area (so it requires two people or leaving a SPL meter in your seating area), you want the loudest as that’s when the phase is alligned, any misallignment causes a reduction in output, and fully opposite in phase completely negates the sound. |
@zipost There is no universally correct polarity option, it’s all system dependent. The same directions apply, flip the switch until the sine wave is louder at the listening position. I’ve also never dealt with subs that need external amplification, so I can’t help you there. However, DSP is usually a huge part in both subwoofers that come with their own plate amp and even DIY subs, I’ve never heard of a sub where you can just add any amp and it’ll work optimally. |
