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  1. #1

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    Default Bi-amping SDA SRS

    Good morning everyone, I have a pair of SDA SRS's I would like to bi-amp. I have a Adcom GFA-565 SE for the bottom end. I have several amps to choose for the highs. What I have to choose from is, Yamaha M-45, M-60, and M-70. A Sansui B 2102. Adcom GFA 545 ii. Heath AA 2500 and an Adcom GFA 1. The last time I bi-amped I used the Yamaha M-45 and M-60. It was ok for low volume but that was it. No mods to the speakers. Thanks for and input.
    N8
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    How do you plan to get the treble volume matched to the bass volume?

    First Guess: You'll have much better sound quality by NOT bi-amping, put the time, money, effort, and enthusiasm into freshening the crossovers and the various other recommended mods.

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    I use the GFA-565 SE right now. Its 300 wpc at 4 ohms. I'm not sure I understand your question matching treble volume to the bass.
    When the music's over...turn out the light.

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    Vertical bi-amping: One amp drives the bass. One amp drives the treble. Unlikely that both amps have the same gain. Therefore, you're going to have to manually match the treble volume to the bass volume. How are you going to do that?

    Thus my suggestion to concentrate on improving the speakers vs. adding additional amplifiers.
    Last edited by Schurkey; 02-25-2013 at 02:04 PM.

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    IMO, bi-amping gets you little to nothing. No advantage and it makes things more complex with gain matching etc.

    Been there with dual Carver amps.

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    You could match the bass and treble by using the gain knobs on the amps. But I agree with the others after trying out vertical bi-amping for myself. There's very little if anything to be gained here. Buy one really nice amp and you'll soon forget all about bi-amping.
    main set up; modded polk 1.2tl's, recapped mcintosh mc2500, restored yamaha c4, clearaudio emotion, nano +beta woodbody, restored sansui tu9900, sony dvp 9000es, def tech pf18 sub, dedicated listening building

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    Quote Originally Posted by motorstereo View Post
    You could match the bass and treble by using the gain knobs on the amps.
    Nope....Name:  adcom-gfa-565se.jpg
Views: 142
Size:  82.1 KBNo gain knobs
    Home Theater:Samsung8000-55LED,Pioneer SC35, Pioneer DV-79AVi, Sunfire TGA7201, LSi25, LCi RTSc, LC80i
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    Very few amps come with gain controls.
    'Political Correctness'.........defined

    "A doctrine fostered by a delusional, illogical minority and rabidly promoted by an unscrupulous mainstream media, which holds forth the proposition that it is entirely possible to pick up a turd by the clean end."

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    I guess I'll try at least one just to say I did.
    When the music's over...turn out the light.

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    Don't bother, it will never sound right with mis-matched amps.
    'Political Correctness'.........defined

    "A doctrine fostered by a delusional, illogical minority and rabidly promoted by an unscrupulous mainstream media, which holds forth the proposition that it is entirely possible to pick up a turd by the clean end."

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    that is a mess. how about sell most of the unused amps and buy another Adcom GFA-565 SE?
    or just sell everything and buy an emotiva amp

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    or just sell everything and buy a high quality amp
    Fixed it for ya.
    'Political Correctness'.........defined

    "A doctrine fostered by a delusional, illogical minority and rabidly promoted by an unscrupulous mainstream media, which holds forth the proposition that it is entirely possible to pick up a turd by the clean end."

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    I was thinking the yammys he mentioned have gain controls if he wanted to go that route. The adcoms don't even have speaker relays let alone gain controls.
    main set up; modded polk 1.2tl's, recapped mcintosh mc2500, restored yamaha c4, clearaudio emotion, nano +beta woodbody, restored sansui tu9900, sony dvp 9000es, def tech pf18 sub, dedicated listening building

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    I would normally agree with the others on this and say buy one good quality amp, or two of the same amps to biamp. However if you already have a bunch of amps lying around, and you have two pairs of matching ICs and speaker cables, give it a try just to see for yourself. You never know, it may workout. Of the combos you mentioned above I would try the Adcom 565 on the lows and the 545 on the highs because they would most likely sound the most alike and have similiar gain characteristics.

    The reason I'm telling you to give it a try is because I decided to do just that on my SRS 2s and I was surprised with the results. I was running my SRS 2s with a Rogue Magnum 88 and I bought a Primaluna Prolugue 4 to use on another system. Just for grins and giggles I decided to try the Primaluna on the highs and the Rogue on the lows. It sounds awesome! To my ears the balance between the lows and highs is perfect and it sounds great. I was really expecting it to sound like a mis-matched mess, but instead it sounds perfect to my ears. Needless to say, I'm keeping it this way and I'm not moving the PL to the other system. I lucked out in that the gain characteristics between the two amps is very similiar. YMMV, but I say if you have the equipment, give it a try for yourself and see what you think. You'll never really know until you try.

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    I think I'll take F1nut's advice for now and just leave it. It does sound good. I don't have the funds for another amp and I don't want to sell any of my other amps.
    When the music's over...turn out the light.

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    Well I had some time before work so I hooked my M 60 up to the highs and wow I never thought it would have made such a difference. Makes low volume listening much better.
    N8
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    Quote Originally Posted by F1nut View Post
    Very few amps come with gain controls.
    While true there are a bunch out there that are not too hard to find, almost all used like Carvers x series amps (AV-705x, 505x, 404x), and B&K has a bunch (including the one FS in the flea market currently).
    Advice is free, the Flea Market is earned - F1Nut

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    or just sell everything and buy a high quality amp
    Quote Originally Posted by F1nut View Post
    Fixed it for ya.
    Thank you.

    Emotiva = Chinese bottom-feeder. NOBODY goes to China to improve quality. Companies source from China and other Communist countries to improve profit margins.

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    Quote Originally Posted by Schurkey View Post
    Thank you.

    Emotiva = Chinese bottom-feeder. NOBODY goes to China to improve quality. Companies source from China and other Communist countries to improve profit margins.
    want to guess where they make LsiM? Iphone, and most things that you're using now?

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    Quote Originally Posted by nhhiep View Post
    want to guess where they make LsiM? Iphone, and most things that you're using now?
    Exactly right. Improved (obscene) profit margins on all of the above.

    Buying Chinese when there's still American, North American, or Free World alternatives is both very silly, and very harmful.

    The Chinese and the Communist Collaborators in this country have already destroyed enormous swaths of (North) American Industry, and put the American economy on a downward spiral. Don't encourage them to destroy even more.
    Last edited by Schurkey; 02-26-2013 at 05:29 PM.

  21. #21

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    so, why are we still buy Polk speakers? My pt is it's all about QC, regardless where it's made. Everywhere I read, Emotiva is the best bang for buck. Same with Polk. But here we're supporting Polk, yet say Emotiva is junk?

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