Active cross-over for Apogee Stages

electronbee · 19th May 2011, 10:57 PM

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.

George

Itsmee · 21st May 2011, 07:05 PM

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

electronbee · 21st May 2011, 10:56 PM

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

Davey · 22nd May 2011, 02:42 AM

George,

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.

Cheers,

Dave.

P.S. (got your PM and responded.)

bentoronto · 01:32 AM

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.

bentl · 31st May 2011, 09:44 AM

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!

Regards
Bent

tmblack · 10th September 2011, 04:39 AM

How do you upgrade an Apogee Stage with an ESL57 electrostatic?

JarreYuri · 10th September 2011, 12:18 PM

Quote:

Originally Posted by tmblack

How do you upgrade an Apogee Stage with an ESL57 electrostatic?

A very good question!

Hahahaha
You can't and You won't.

cyclotronguy · 16th September 2011, 06:00 PM

Rich Murry at True Sound Works in Minden Nevada, does just that; rebuilds Apogee speakers and adds Pass Labs XVR-1 crossovers.

Cyclotonguy

a.wayne · 18th September 2011, 04:41 AM

Does he have stages or mini grands ..?

19th May 2011, 10:57 PM	#1
electronbee diyAudio Member Join Date: Mar 2005 Location: Virginia Beach, VA	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. George

30th May 2011, 01:30 AM	#5
bentoronto diyAudio Member Join Date: Jan 2008 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. __________________ Dennesen ESL tweets, Dayton-Wright ESL (110-3200Hz), Klipschorn mixed-bass woofer w/param. EQ plus 1954 AR-1W or giant OB HiFi construction since 1956 Last edited by bentoronto; 30th May 2011 at 01:32 AM.

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21st May 2011, 07:05 PM	#2
Itsmee diyAudio Member Join Date: Feb 2009	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

21st May 2011, 10:56 PM	#3
electronbee diyAudio Member Join Date: Mar 2005 Location: Virginia Beach, VA	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

22nd May 2011, 02:42 AM	#4
Davey diyAudio Member Join Date: Dec 2001 Location: Bremerton, WA.	George, 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. Cheers, Dave. P.S. (got your PM and responded.)

31st May 2011, 09:44 AM	#6
bentl diyAudio Member Join Date: Apr 2009 Location: Norway	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! Regards Bent

10th September 2011, 04:39 AM	#7
tmblack diyAudio Member Join Date: Jan 2005 Location: UK	How do you upgrade an Apogee Stage with an ESL57 electrostatic?

16th September 2011, 06:00 PM	#9
cyclotronguy diyAudio Member Join Date: Sep 2001 Location: Northern California	Rich Murry at True Sound Works in Minden Nevada, does just that; rebuilds Apogee speakers and adds Pass Labs XVR-1 crossovers. Cyclotonguy

18th September 2011, 04:41 AM	#10
a.wayne diyAudio Member Join Date: May 2008 Location: Front Row Center	Does he have stages or mini grands ..?

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