If you look at the review by Stereophile

Posted by Timbo in Oz (A) on October 5, 2016 at 00:29:20

In Reply to: RE: Bi-Amping - Horizontal and Vertical posted by erik_sq on October 4, 2016 at 14:32:35:

You will find that there is a low-pass filter for the Base Module but with the OP's items it's inside the Base Module and not in an external box.

The real flaw in the EOS design is that the main module is tuned to 40hz by a port but there is no HP filter to the main module.

So the design is prone to excursion overload below the port frequency, by high level (full power -3db) low bass (below 40 Hz signals going to the main module. Adding to this problem is the low sensitivity of the design.
You can either

i) fix that problem somewhere in the wide band-pass between the two modules and go with active low-pass alone, in the existing band-pass between the two modules. Plus a line-level passive HP to the amps driving the main module, 1st or 2nd order is doable.

(Because the MM is time & phase coherent, I think a 1st order PLL feeding the Main Module amps would retain more of its designed in impulse response. The response would cascade to 5th and cone bounce would fall enough to help.) OR

ii) get rid of the existing passive LP xover that is inside the Base Module and actively bi-amp 4LR at say 70 Hz. System headroom would increase even more dues to the higher xover.

Adding a 20Hz HP filter would avoid overloading the Base Module. There's a 40Hz subsonic add-on in the DBX xover which 'might' be convertible to 20Hz. Which would give even more headroom.

Warmest

Tim Bailey

Skeptical Measurer & Audio Scrounger

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Follow Ups Full Thread

Topic - Bi-Amping - Horizontal and Vertical - Lifer 16:41:02 10/02/16 (25)

RE: Bi-Amping - Horizontal and Vertical - SgreenP@MSN.com 21:18:20 10/04/16 (1)

Problem is teh main module a 2-way is port tuned to ~ ) 40 Hz but no HP filter - causing overload/cone-bounce - Timbo in Oz 21:58:46 10/04/16 (0)

Same approach I take with my HT - E-Stat 06:04:25 10/04/16 (1)

RE: Same approach I take with my HT - Lifer 12:31:01 10/04/16 (0)

Perhaps that is why I find the adjustment of frequency (now at 70 HZ) and the .. adjustments .. very finicky" - Timbo in Oz 23:16:57 10/03/16 (3)

RE: Perhaps that is why I find the adjustment of frequency (now at 70 HZ) and the .. adjustments .. very finicky" - Lifer 12:30:01 10/04/16 (2)

a correction, to use the Active crossover you would need to bypasss the passive LP crossover that is inside - Timbo in Oz 20:34:06 10/04/16 (1)

RE: a correction, to use the Active crossover you would need to bypasss the passive LP crossover that is inside - Kal Rubinson 05:56:33 10/05/16 (0)

RE: Bi-Amping - Horizontal and Vertical - A.Wayne 20:45:55 10/03/16 (1)

RE: Bi-Amping - Horizontal and Vertical - hahax@verizon.net 20:28:22 10/04/16 (0)

Sounds like horizontal to me. As far as I know, the term... - jeffreybehr 15:45:59 10/03/16 (1)

Review? - Timbo in Oz 23:37:20 10/03/16 (0)

RE: Bi-Amping - Horizontal and Vertical - erik_sq 08:48:17 10/03/16 (9)

RE: Bi-Amping - Horizontal and Vertical - Lifer 12:38:51 10/04/16 (3)

RE: Bi-Amping - Horizontal and Vertical - erik_sq 14:32:35 10/04/16 (2)

If you look at the review by Stereophile - Timbo in Oz 00:29:20 10/05/16 (0)

If you look at the review by Stereophile - Timbo in Oz 00:15:29 10/05/16 (0)

Review? - Timbo in Oz 23:39:06 10/03/16 (0)

RE: Bi-Amping - Horizontal and Vertical - pictureguy 20:02:45 10/03/16 (3)

RE: Bi-Amping - Horizontal and Vertical - erik_sq 20:17:11 10/03/16 (2)

RE: Bi-Amping - Horizontal and Vertical - pictureguy 20:52:41 10/03/16 (1)

Bi-amping with planars? - Timbo in Oz 00:06:56 10/04/16 (0)

Artemis Eos!!!!! - Kal Rubinson 06:45:00 10/03/16 (2)

See above? - Timbo in Oz 00:10:09 10/04/16 (0)

We took a pair in trade - Awe-d-o-file 09:17:42 10/03/16 (0)

Follow Ups

If you look at the review by Stereophile - Timbo in Oz 00:29:20 10/05/16 (0)

If you look at the review by Stereophile

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