Active cross-over for Apogee Stages - diyAudio
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Old 19th May 2011, 10:57 PM   #1
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Default Active cross-over for Apogee Stages

My dad has upgraded and I have received his "old" Apogee Stages. They are from before when they were shipping them with the bass units.

Any ways, I have been scouring the internet in hopes that someone, somewhere, had made an active cross-over for them. Specifically, when it comes to bi-amping. I can easily find the original cross-over schematic of what's inside the speakers and some other after market variants.

But, I'd really like to go active on them.

If anyone has any links or resources in regards to this that'd be great.

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Old 21st May 2011, 07:05 PM   #2
Itsmee is offline Itsmee  England
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I was thinking of using a couple of (Nelson Pass) B1 buffers to sandwich a passive 12dB RC filter with my Stages; or maybe a variation of this one with 2SK170BL JFET's and a crossover freq @ 600Hz

JFET Active Crossover
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Old 21st May 2011, 10:56 PM   #3
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Hrmm... that sounds interesting. I know the original crossover was a 6db one which then tapered off into a 12db one. Or, maybe it was 6db on the low-pass and then 12db n the high-pass.

I wanted to biamp then and toss out that internal x-over.

I was maybe thinking of a tube based variant as well somewhere in there.

Thanks for that forum link. It's hard finding some Stage stuff
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Old 22nd May 2011, 02:42 AM   #4
Davey is offline Davey  United States
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The original Stage crossover is a 12db/octave alignment with filter section Q's equal to approximately 0.4. The "seamless 6db tapering to 12db" was just Apogee marketing-speak for filter sections with the lower Q.



P.S. (got your PM and responded.)
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Old 30th May 2011, 01:30 AM   #5
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Location: Toronto and Delray Beach, FL
I have no knowledge of your system but I do have some strong opinions about feasible way to handle crossover. First, waste of effort to try to tinker with low-level crossovers - even on the odd occasion when theory and construction match, you still need to fudge a lot to make it sound right.

High road is to buy a $150 Behringer CX3400. Has all the controls and flexibility anybody could possibly want for almost any configuration you can think of. Amps are cheap and a lot of reasons to bi- or tri-amp.

Then you get a Radio Shack sound level meter and free plotting software and the Radio Shack correction curve. I use REW for the Mac. Waited 50 years to be able to plot so easily (except for the period when I had access to the Bell Labs anechoic chamber).

Then you tinker till you like it by ear.
HiFi aspirations since 1957. Currently working on motional feedback again... the final frontier in audio

Last edited by bentoronto; 30th May 2011 at 01:32 AM.
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Old 31st May 2011, 09:44 AM   #6
bentl is offline bentl  Norway
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Hi, check out the Home | miniDSP

This board with a x-over plugin should solve your problems. Make a nice box for it ;-)

DIY-style crossover. I have one and I like it!

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Old 10th September 2011, 04:39 AM   #7
tmblack is offline tmblack  United Kingdom
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How do you upgrade an Apogee Stage with an ESL57 electrostatic?
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Old 10th September 2011, 12:18 PM   #8
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Originally Posted by tmblack View Post
How do you upgrade an Apogee Stage with an ESL57 electrostatic?
A very good question! Hahahaha
You can't and You won't.
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Old 16th September 2011, 06:00 PM   #9
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Rich Murry at True Sound Works in Minden Nevada, does just that; rebuilds Apogee speakers and adds Pass Labs XVR-1 crossovers.

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Old 18th September 2011, 04:41 AM   #10
a.wayne is offline a.wayne  United States
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Does he have stages or mini grands ..?
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