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  1. #1

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    Default Aragon Amps with SDA speakers

    Hi All,

    New SDA owner here... I want to use either one of my Aragon amps 8008BB or 8008x3 to power my SDA-2Bs.
    I am aware of the need for common ground on the amplifier end.

    From my reading here...

    Do I need to take a measurement between the the two negative binding posts 1st?

    Can I simply connect a wire between the two negative posts on my 8008BB?

    With the 8008x3 amplifier ... do I connect all 3 negative posts?

    I want to ensure that I don't damage either the amps or speakers before I go any further.

    Thanks for any input.

  2. #2

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    Use an ohm meter and measure the resistance between the negative post of the two channels you want to use for your SDA's. It should read very close to zero ohms. If it does you are safe to use the amps. Or you can contact Aragon and ask them if they are common ground or maybe someone with some experience with these will chime in.
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  3. #3

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    Take a look at this article from Indy Audio Labs(new owner of Aragon & Acurus): http://www.indyaudiolabs.com/blog/20...lifier-designs ,3rd & 4th paragraphs
    Last edited by DaveHo; 04-14-2014 at 09:51 AM.

  4. #4

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    Looks like you will need a Dreadnaught or AI-1 interface for this amp
    Home Theater
    Onkyo PR-SC5508 Sharp LC-70LE847U
    Emotiva XPA-5 Emotiva XPA-2 Emotiva UPA-2
    Front RTi-A9 Wide RTi-A7 Center CSi-A6 Surround FXi-A6 Rear RTi-A3 Sub 2x PSW505
    Sony BDP-S790 Dishnetwork Hopper/Joey Logitech Harmony One Apple TV
    Two Channel
    Oppo 105D BAT VK-500 w/BatPack SDA SRS 2.3 Dreadnought Squeezebox Touch Apple TV

  5. #5

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    You can go ahead and measure resistance, but I've measured three 8008BBs, and they're all ~20 ohms between the channels on the negative terminals. They are semi-common-ground, or partial-common-ground, and they sound like sh!t with my 1Bs. I have every expectation that the 8008X3 is the same.

    Another member here has an 8008BB, and it actually shut down when used with his 3.1TL. (I think they were 3.1TLs.)

    A simple jumper wire between the negative binding posts of the two channels is all it took to instantly and completely fix the problem for me. The other member also tried a jumper wire, but ultimately preferred the Dreadnaught isolation transformer. The isolation transformer is not an option with my 1Bs. It is for your 2Bs. If you use the 8008x3, you'd jumper the two channels that drive your 2Bs. There's no need to jumper the third channel. If you choose to use the isolation transformer, you don't need the jumper wire.

    http://www.polkaudio.com/forums/show...t-Project-Pt.1

    The link above is the best start. There are many other threads but that's the one to begin with. Search for "Dreadnought" (proper spelling) and also "Dreadnaught" (commonly used spelling) on this site.

    For the record, Indy Audio Labs does not recommend the jumper-wire solution; but wouldn't tell me why except that it was "safety" related. I discount their concern, as I've been using the jumper wire for years without problem.
    Last edited by Schurkey; 04-14-2014 at 01:47 PM.

  6. #6

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    Quote Originally Posted by Schurkey View Post

    For the record, Indy Audio Labs does not recommend the jumper-wire solution; but wouldn't tell me why except that it was "safety" related. I discount their concern, as I've been using the jumper wire for years without problem.
    Likely because the purpose of the two 10ohm resistors is to tie each channels circuit ground to chassis "safety' ground separately.The resistance eliminates the potential for ground loops that could occur if there was a direct connection to the chassis.However jumpering the negative terminals does not negate the chassis connection ,it just changes the resistance due to them now being connected in parallel.

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