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RE: MY Open Baffle Dipole Sub Results

Posted by emailtim (A) on November 11, 2024 at 18:51:23

In Reply to: RE: MY Open Baffle Dipole Sub Results posted by MarcL on November 10, 2024 at 12:28:24:

FWIW, when I did my test, I compared the Rythmik servo amp against B&O IcePower 1000ASP amps. "Better" amps may perform better than the amps I tested.

The 1000ASP amp measured better (REW) with faster dampening/setting than the servo amp using 2 drivers per side (no change in speaker, nor mic positions, just swapping amp feeds). That being said, I did not hear a difference.

I did not try this test with 3 drivers per side. The 1000ASP amp is stable to lower Ohm loads and has more power than the Rhythmik amp so I would assume 3 or 4 drivers per side would follow suit.

I used my own FIR dipole compensation filters. The dipole compensation filters in the Rythmik amp can't be defeated without a special control board from Brian D. Same goes for most all of the controls in the plate amp.

I spoke with Brian D about using the IcePower amps when they first came out. He said he tried to negotiate a deal with the OEM, but they would not add the hooks he needed to make it a servo unit. If they did, the resulting servo would probably benefit from a stronger amp.

For a while, Brian did have servo amps using a different amplifier, then they were discontinued. I haven't followed the progression since then.

Brian confirmed he made some one-size-fits-all engineering decisions for the servo amp. He also confirmed that those one-size-fits-all decisions may not be optimal for every application ( by definition ).

I bought a special board from him to get around this problem and in the end, decided to do all of my configurations in one place instead of playing dueling banjos in case a physical control accidentally got changed. Another dueling banjo was the upstream filters undoing unwanted changes in the plate amp filters (shortest distance between 2 points is a straight line, instead of tacking).

It also removed another layer of filters and circuitry from the signal chain while allowing more sub amp options. Sold off the plate amps.

Since the H-Frame cabinet has no backwall/cabinet induced waves, most all of the designs issues the servo was trying to address in a sealed cabinet does NOT exist in an OB/Dipole design.

If memory serves, the servo amp was designed for sealed and ported boxes, not OB/Dipoles without boxes. The latter application came after the former and required some modifications for that application.

A370PEQ Dampening Factor:

The A370PEQ is rated at 370 watts of power into a 4 ohm load.
Harmonic distortion is less 0.01% at 200WRMS @4ohms (-3 dB from full output).

Damping factor: 160 @ 4ohms. (Note: damping factor is speaker wires dominated. Without speaker wires, the native damping factor is >800).

ICEPower 1000ASP Dampening Factor:

1000W @ 0.01% THD+N, 100 Hz, 4 ohm

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2022/03/30 Historical Records CENSORED

• A370PEQ   (Open in New Window)

Edits: 11/11/24 11/11/24 11/11/24 11/11/24 11/11/24 11/11/24 11/11/24

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