Bi-amping 1.2TLs

hearingimpared
hearingimpared Posts: 21,137
edited October 2006 in Basic Hookup/Wiring Questions
This post was originally written to Univera in another thread. I thought I'd get more hits starting a new thread.

Please, help me out here. I have the opportunity to snag two 2200 PE's from a local guy doing a garage sale. I have two Adcom GFA 565 mono block's with the Musical Concepts upgrades and power cord upgrades. I read all your posts and others concerning the NADs (I've owned 2200 PEs a long long time ago and liked them) and Adcoms. I'm thinking I would go with the Adcoms on the low freqs of the 1.2 TLs and bi-amp the 2200 PEs on the highs. I need help on how to actually wire them coming out of the preamp. I have a Spectral DMC 10 and am going to use the AC coupled outputs for this rig. I spoke to Spectral and they suggested using the AC coupled outs with this rig because the DC coupled outs would reek havoc with anything less in quality than a Spectal amp . . . whatever . . . don't think I'm spending $25K on a Spectral power amp to find out how the DC coupled outputs sound. But who knows when the obsession takes an irrational turn. My wife would leave me in a heartbeat and in the divorce procedings win all my audio/video equipment . . .back! back! back! on topic here.

Now I know I can tie the grounds & chasis of the Adcoms together. I believe I don't need to tie the NADs grounds together for the high freqs . . . is that correct?

After coming out of the preamp do I use a Y connector to split the signal to each channel, one to the left Adcom the other to the left NAD and visa versa? I would then connect each left amp to the proper posts on the left 1.2 TL and visa versa . . . does that sound about right????

Hope I didn't confuse ya here. . . I probably need to know by Thursday night whether I am going to pull the trigger on the PEs. . .BTW it looks like they are in near mint condition. . . very clean . . . no cigarette residue anywhere, the guy let me pop the top, very clean inside. He's checking the used prices on the website before commiting to a price. . . so I'm holding my breath here.

How would I bi-amp with just one amp for the high frequencies?

Thanks,
Joe
Post edited by hearingimpared on
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  • hearingimpared
    hearingimpared Posts: 21,137
    edited October 2006
    Heeeeelllllloooooooo!!!!

    ANNNNNYYYYY

    BBBOOOOOOODDDDDYYYY

    OOOOOOUUUTTTT

    TTTTTHHHHEEEEEERRRRREEEE?????

    Please help.

    Joe
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  • madmax
    madmax Posts: 12,434
    edited October 2006
    You need to find this fellow named "Dude". :)
    madmax
    Vinyl, the final frontier...

    Avantgarde horns, 300b tubes, thats the kinda crap I want... :D
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  • hearingimpared
    hearingimpared Posts: 21,137
    edited October 2006
    madmax wrote:
    You need to find this fellow named "Dude". :)
    madmax
    I couldn't find Dude so I asked "Please.":D
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  • amulford
    amulford Posts: 5,020
    edited October 2006
    That sounds right. You split the L & R signals and feed those split signals to the respective amps. Then connect the amp to the respective binding post.

    Now if you can somehow filter the signals before you send it to the amps, it would make it even more efficient.

    One question, are they similar in power? If they aren't, you may not like the result.
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  • hearingimpared
    hearingimpared Posts: 21,137
    edited October 2006
    How about this. The guy who was selling the NADs was so impressed with my enthusiasm that he decided to keep them for a future rig. I gotta calm down dammit!!!

    Going to the Spectral Audio show at Overture Audio in Wilmington, Delaware tomorrow. . .my wife is going with me, she actually volunteered!!! How about that!!!
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  • hearingimpared
    hearingimpared Posts: 21,137
    edited October 2006
    amulford wrote:
    Now if you can somehow filter the signals before you send it to the amps, it would make it even more efficient.

    How would I accomplish that?
    One question, are they similar in power? If they aren't, you may not like the result.

    They are similar in power. . . the Adcoms are 300 wpc mono blocks, the NADs 400 wpc bridged mono.

    Thanks,
    Joe
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  • schwarcw
    schwarcw Posts: 7,340
    edited October 2006
    Just my personal opinion, but I would biamp these with a pair of Parasound Halo A21 (250 wpc at 8 ohms, much more at 4 ohms). These run about $1,150 - $1,200 each.

    If you can afford it (who can) get a pair of Krell KSA-250. The results will be stunning. These run $3,000 and up each.
    Carl

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  • JKnPA
    JKnPA Posts: 41
    edited October 2006
    Philly Guy,
    amulford wrote:

    Now if you can somehow filter the signals before you send it to the amps, it would make it even more efficient.[\QUOTE]
    *******************************************************
    I don't own this unit, but I'm thinking of buying one in the future!
    Many different units/parts to choose from; located in NY............
    http://www.marchandelec.com/xm9.html

    * Another link........ used by other posters in this forum....:rolleyes:
    See figure 1. .............................
    http://sound.westhost.com/bi-amp.htm
    ** I'll be the middle man .... Philly/ Pottsville/Pittsburgh

    JK.
    Denon 1906AVR
    Polk... M40s, Cs1
    JVC DVD player XV-SA600
    Sharp LC-37D6U
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  • univera
    univera Posts: 848
    edited October 2006
    If you still want to go the 2200PE route and pick up another elsewhere, I am parting with mine. Don't know the ratings system, but has a few minor scratches on the top edge. I'd say 7/10 due to age/scratches. Nothing major. Need to free up some cash...as I have gone buy crazy of late. IM if interested.
    UNIVERA
    Historic Charleston SC

    2 Channel:
    SDA-SRS's RDO tweets
    Biamped Anthem 2 SE's w/1970's NOS Siemens CCA's
    Anthem Pre 2L w/E.harmonix platinum matched 6H23's
    CDP- NAD C 542


    HT setup:
    AVR: NAD T 773
    Rears: Polk LC80i
    DVD: Toshiba 3109 dual tray
    Subs: Velodyne and M&K
    T.V.: Sony KDL-52XBR4 w/Vans Evers Clean Line Jr.
    Conditioner: Panamax M5100EX

    Master Bedroom Sony 40KDL-XBR3

    "I love it when a plan comes together." Hannibal Smith, The A-Team
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  • amulford
    amulford Posts: 5,020
    edited October 2006
    I was thinking about trying these filters called FMods, but have gotten around to it. Go to Parts Express and search them.
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  • hearingimpared
    hearingimpared Posts: 21,137
    edited October 2006
    JKnPA wrote:
    Philly Guy,
    amulford wrote:

    Now if you can somehow filter the signals before you send it to the amps, it would make it even more efficient.[\QUOTE]
    *******************************************************
    I don't own this unit, but I'm thinking of buying one in the future!
    Many different units/parts to choose from; located in NY............
    http://www.marchandelec.com/xm9.html

    * Another link........ used by other posters in this forum....:rolleyes:
    See figure 1. .............................
    http://sound.westhost.com/bi-amp.htm
    ** I'll be the middle man .... Philly/ Pottsville/Pittsburgh

    JK.

    In the SRS 1.2 TLs user manual, Polk recommends using a crossover as a second option for bi-amping hmmmmm.
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  • hearingimpared
    hearingimpared Posts: 21,137
    edited October 2006
    univera wrote:
    If you still want to go the 2200PE route and pick up another elsewhere, I am parting with mine. Don't know the ratings system, but has a few minor scratches on the top edge. I'd say 7/10 due to age/scratches. Nothing major. Need to free up some cash...as I have gone buy crazy of late. IM if interested.

    I'm wondering if just one 2200 would be enough to do the job when bi-amp to the high frequencies. 2200s boast a clean 200 wpc/8 ohms. Maybe I'm just being obsessive and going overkill by wanting to use one NAD per channel??? Hell for the price you can't beat the NADs. Any thoughts???
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  • hearingimpared
    hearingimpared Posts: 21,137
    edited October 2006
    JKnPA wrote:
    Philly Guy,
    amulford wrote:

    Now if you can somehow filter the signals before you send it to the amps, it would make it even more efficient.[\QUOTE]
    *******************************************************
    I don't own this unit, but I'm thinking of buying one in the future!
    Many different units/parts to choose from; located in NY............
    http://www.marchandelec.com/xm9.html

    * Another link........ used by other posters in this forum....:rolleyes:
    See figure 1. .............................
    http://sound.westhost.com/bi-amp.htm
    ** I'll be the middle man .... Philly/ Pottsville/Pittsburgh

    JK.

    Thanks JK very very informative sites. The westhost site goes into extensive technical detail. Thanks again,
    Joe
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