[Newkid]

Congratulations on the circle, many knowledgeable members and lots of information.

I'm very interested on getting a pair of the 12" servo kits, but I have a few questions:

-On the PEQ servo amps, am I understanding right that the crossover can only be set at either 50 or 80 Hz?

-On the website it says that the knob marked 'crossover' is for fine tuning, does that mean it can be set a few Hz from those frequencies? If so, what would be the range?

-Is there a way to adjust the slope from 24 to 12 dB?

Thank you all for your help

[richidoo]

This closeup pic might help:
http://www.gr-research.com/images/A370PEQ_s[1].jpg
And Danny's writeup:
http://www.gr-research.com/index.asp?PageAction=VIEWPROD&ProdID=142

Danny has designed a speaker system crossing with open baffle midbass driver, so it's higher than 80Hz. He has said in the original thread that it can kinda go up to ~200Hz iirc.... it's been a while.

[Newkid]

This closeup pic might help:
http://www.gr-research.com/images/A370PEQ_s[1].jpg
And Danny's writeup:
http://www.gr-research.com/index.asp?PageAction=VIEWPROD&ProdID=142

Danny has designed a speaker system crossing with open baffle midbass driver, so it's higher than 80Hz. He has said in the original thread that it can kinda go up to ~200Hz iirc.... it's been a while.

Thanks for your response. I've checked through GR's website and the only thing that came up is:

"For those don't have HT receiver, or don't use the bass management function on receivers would require the plate amp implement this xover function and that is what this 50hz/24 and 80hz/24 are for. 50hz/24 means the plate amp implement a LP filter with a fixed 12db at 50hz, plus the 12db adjustable knob to make up a 24db total slope. Similarly for 80hz/24. The following shows the FR of this 50hz and 80hz fixed filter. "

and

"... one should always use the xover knob in the middle to fine tune the overlap between subwoofer and front speakers."


Rythmik Audio's site does not say much more about these controls, both mention that the slope is adjustable from 12 to 24 dB/Octave, but neither says how.

[Danny Richie]

It works like this:

It has a variable crossover that has a range of 25Hz to 120Hz. That slope is 12db per octave.

You can use that and that control only by leveling the control on the left hand side to Ext/12.

Or you can select an addition 12db per octave roll off by placing the switch in the 50Hz/24 or the 80Hz/24.