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In Reply to: RE: DIY DWM? posted by RickeyM on November 01, 2020 at 11:50:26
Here are his OB/Dipole Servo Subwoofer kits.https://www.gr-research.com/diy-subwooofer-kits.html
His DIY forum is here. You can build your own H-Frames (the schematics and wiring diagrams are provided), have someone else build them for you (e.g. local carpenter or cabinet shop to save on shipping) or buy some CNC flat packs from some of the guys on his forum, glue them up and paint them.
https://www.audiocircle.com/index.php?board=16.0
You can buy the drivers and use your own amps if you don't want to go servo immediately to save money. You will have to provide your own XO's and DSP.
People make them in duals, triples, quads and 6 driver towers. Singles are far and few in between.
HTH
Edits: 11/01/20 11/01/20Follow Ups:
One thing to be aware of is that the Rythmik plate amp included in the OB/Dipole Sub has a dipole cancellation compensation network (Rythmik's Brian Ding calls it a shelving circuit) that you won't have if you run the woofers with a non-Rythmik amp. You can read about it and the entire sub design on the Rythmik website.
That is why I wrote, "You will need your own XO and DSP if you use your own amp".
Do you use the servo function?
Agilist, Musician, Photographer, Audiophile
Magneplanar: 3.7, CC5, MC1, DWM; Outlaw: UltraX12, LFM-1C; Emotiva: XMC-1, PA-1; Nord: Nord One NC500DM; Outlaw: Model 7500; OPPO 205
Edits: 11/02/20
In short, not any more.If you read Brian Ding's description of his Rythmik Servo amp from his webpage, the servo was designed to counteract the sound wave reflected off the back of an enclosed speaker cabinet which distorts the cone's movement from the back. The cabinet configuration basically has 2 "motors" (1 real voice coil, 1 reflected) acting against each other driving the cone's signal.
With an OB/DIPOLE configuration, there is no "cabinet back" to reflect the back wave, thus the Servo appears to be a solution without a problem for this application, potentially more of a niche marketing tool for OB/Dipole.
I originally bought their base RCA/Single ended servo amp and played with that. Once I had upstream DSP capabilities, I tried my ICEPower 1000ASP amps with my own dipole compensation and extension filters and XO. I discovered that I could not tell the difference. Using REW and a calibrated miniDSP UMIK-1, the 1000ASP amps actually dampened the drivers slightly quicker than the Servo amp. The ICEPower 1000ASP's amps strong point are low frequencies where it has lower noise than mids and highs.
I also had issues with the base servo amp in my specific application because I wanted to push the drivers higher in frequency. The basic Rythmik amp has an undefeatable low pass XO, so my controls upstream were battling with the controls in the plate amp. If you buy the XLR (balanced I/O) version of the Rythmik Servo OB/DIPOLE plate amps, you can completely defeat the plate amp's XO if desired. This is not an issue for most users because they were not trying to push the subs flat to 250Hz.
The Rythmik Servo plate amp is a SWISS ARMY KNIFE for most users because the users do not have upstream XO and DSP capabilities (or don't want to deal with them). It has an XO, phase, 1 Boost/cut PEQ as well as 3 extension filters so it definitely has its value for the majority of its intended audience.
One other note for the servo amps. For the servo to work, they need to be in close proximity to the subs. The servo sensor wires have to be short so no long subwoofer cables which is no different than any other powered sub with a plate amp.
HTH
Edits: 11/02/20
Thanks! I thought I remembered this about the servos. Makes sense.
Agilist, Musician, Photographer, Audiophile
Magneplanar: 3.7, CC5, MC1, DWM; Outlaw: UltraX12, LFM-1C; Emotiva: XMC-1, PA-1; Nord: Nord One NC500DM; Outlaw: Model 7500; OPPO 205
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