SDA 2's With Carver M1.0t amp

tshagg
tshagg Posts: 21
edited March 2009 in Vintage Speakers
Hopefully someone can shed some light on this for me. I have a pair of SDA 2's and I purchased a carver M1.0t amp. I understand that I must use a common ground amp to utilize the interconnecting cable. Here lies my problem
the positive connector on one channel is common to the negative connector on the other. One channel is inverting the other is non inverting. Before I blow something up, if someone knows how I am supposed to connect this to my speakers your help would be greatly appreciated.
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  • ben62670
    ben62670 Posts: 15,969
    edited March 2009
    Are you talking about on the amp, or speaker? The amps grounds need to be common. In the speaker the terminals are flipped at one end. No problem.
    Please. Please contact me a ben62670 @ yahoo.com. Make sure to include who you are, and you are from Polk so I don't delete your email. Also I am now physically unable to work on any projects. If you need help let these guys know. There are many people who will help if you let them know where you are.
    Thanks
    Ben
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  • tshagg
    tshagg Posts: 21
    edited March 2009
    I am sorry I was talking about the terminals on the amp. The positive on one channel is common with the negative on the other channel. Does this make sense? One channel says inverting the other non inverting. I thought polarity was a big thing with speakers and amps.
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  • gdb
    gdb Posts: 6,012
    edited March 2009
    Hi tshagg, the guy who really knows those M1.0T amps is RichP,go to his forum and describe your amp to him and he'll tell you whether or not it can work safely with your SDAs. IIRC there were two or more versions and one was common ground. Good luck !!:)

    http://thecarversite.com/yetanotherforum/default.aspx?
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  • zingo
    zingo Posts: 11,258
    edited March 2009
    If the two negative terminals aren't common, then I would say no. But I would definitely check with the gent at the Carver Forum.
    Jake
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  • tshagg
    tshagg Posts: 21
    edited March 2009
    Thank you everyone, I will check with the Carver forum
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  • tshagg
    tshagg Posts: 21
    edited March 2009
    I checked with the Carver forum, they said to check with the Polk forum. Can anyone help me with a definite answer on this?
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  • F1nut
    F1nut Posts: 50,746
    edited March 2009
    The positive on one channel is common with the negative on the other channel.

    In that case, the negative outputs cannot be common and therefore you cannot use the SDA cable.

    RichP is a liar and a **** bag.
    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 t-u-r-d by the clean end."

    President of Club Polk

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  • CTTE
    CTTE Posts: 183
    edited March 2009
    It sounds like it depends on which version of the amp you have.

    Check out post #25 from this thread:
    http://www.polkaudio.com/forums/showthread.php?t=75298
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  • thsmith
    thsmith Posts: 6,082
    edited March 2009
    Yep, it seem pretty clear "The M-500 and M-500t are NOT common ground, and the early version of the M-1.0t is NOT common ground. Later serial numbers of the M-1.0t ARE common ground, and if the back of the amp has a stereo/mono switch, it IS the common ground version (also known as non-inverting)."
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  • tshagg
    tshagg Posts: 21
    edited March 2009
    This is depressing!! Well I guess I will have to sell this one and buy another one.

    Thank you all for your help.
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  • nooshinjohn
    nooshinjohn Posts: 25,461
    edited March 2009
    tshagg wrote: »
    This is depressing!! Well I guess I will have to sell this one and buy another one.

    Thank you all for your help.

    look or the TFM series Carvers as they are nice sounding amps and all are common ground
    The Gear... Carver "Statement" Mono-blocks, Mcintosh C2300 Arcam AVR20, Oppo UDP-203 4K Blu-ray player, Sony XBR70x850B 4k, Polk Audio Legend L800 with height modules, L400 Center Channel Polk audio AB800 "in-wall" surrounds. Marantz MM7025 stereo amp. Simaudio Moon 680d DSD

    “When once a Republic is corrupted, there is no possibility of remedying any of the growing evils but by removing the corruption and restoring its lost principles; every other correction is either useless or a new evil.”— Thomas Jefferson
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  • Schurkey
    Schurkey Posts: 2,104
    edited March 2009
    First Guess: One of the lesser-known Carver "innovations".

    He used to run one channel with backwards polarity; and then label the speaker terminals backwards on that channel. "Two negatives equal a positive". The speakers both saw correct polarity.

    The amp channel was backwards polarity since Carver figured that bass notes were likely to be in-phase in both channels, and that way one channel could draw from the negative power rail, and the other channel could draw from the positive power rail; overall the power supply could be smaller, lighter, less expensive since the power rails only had to support 1/2 of the total bass output.

    Second Guess: That IS a common-ground amp; and it'll work just fine if you use it with SDA speakers having an interconnect cable--but--I'm not buying you replacement equipment if you do let the smoke out of what you have.
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  • tshagg
    tshagg Posts: 21
    edited March 2009
    I am not going to take any chances, I really like these speakers.
    A really nice person on the Carver forum is going to trade amps with me.
    Thanks to all
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