Common ground amps

leroyjr1
leroyjr1 Posts: 8,785
edited January 2009 in Electronics
Does anyone know if Rotel amps are common ground? Need to know how they'll work with SDA's?

Rotel

RB-1092 2 channel
RB-1080 2 channel
RMB-1075 5 channel
RMB-1095 5 channel

Thanks
Post edited by leroyjr1 on
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  • dorokusai
    dorokusai Posts: 25,576
    edited January 2009
    Got a multimeter? Super easy to figure that out.
    CTC BBQ Amplifier, Sonic Frontiers Line3 Pre-Amplifier and Wadia 581 SACD player. Speakers? Always changing but for now, Mission Argonauts I picked up for $50 bucks, mint.
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  • leroyjr1
    leroyjr1 Posts: 8,785
    edited January 2009
    dorokusai wrote: »
    Got a multimeter? Super easy to figure that out.



    I'm listening, keep going.
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  • strider
    strider Posts: 2,568
    edited January 2009
    Doro will hopefully correct me if I'm wrong, but AFAIK...

    Set the meter to check resistance, amp off, unplugged if it makes you feel more comfortable. Take off shoes and any metal jewelry.

    Set the probes on each of the negative binding posts, if it's open you'll get no reading (reads - - - - on my meter) and the amps non-common ground. If you get zero or close then the amp ground is common.
    Wristwatch--->Crisco
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  • ShinAce
    ShinAce Posts: 1,194
    edited January 2009
    Yep, check for resistance between the negative terminals. Zero resistance is common ground.

    Another way without a meter is to look at the bridging options. If the amp is bridgeable and you need to use the red terminals for the single speaker, it's common ground.
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  • leroyjr1
    leroyjr1 Posts: 8,785
    edited January 2009
    Thanks ShinAce & strider
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  • leroyjr1
    leroyjr1 Posts: 8,785
    edited January 2009
    strider wrote: »
    Doro will hopefully correct me if I'm wrong, but AFAIK...

    Set the meter to check resistance, amp off, unplugged if it makes you feel more comfortable. Take off shoes and any metal jewelry.

    Set the probes on each of the negative binding posts, if it's open you'll get no reading (reads - - - - on my meter) and the amps non-common ground. If you get zero or close then the amp ground is common.


    Will it be the same with my 5 channel amp as well?
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  • disneyjoe7
    disneyjoe7 Posts: 11,435
    edited January 2009
    ShinAce wrote: »
    Yep, check for resistance between the negative terminals. Zero resistance is common ground.

    Another way without a meter is to look at the bridging options. If the amp is bridgeable and you need to use the red terminals for the single speaker, it's common ground.


    I add a little to this. Now if you use 2 amps in this fashion (bridged) it's acts and is non common ground.


    Ok thats clear as mud. :(

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  • strider
    strider Posts: 2,568
    edited January 2009
    leroyjr1 wrote: »
    Will it be the same with my 5 channel amp as well?

    Should be.
    Wristwatch--->Crisco
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  • leroyjr1
    leroyjr1 Posts: 8,785
    edited January 2009
    Just an update. I emailed Rotel asking if there amps was common ground and they just got back with me .

    All amps are common ground except the new class d digital amps.
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  • BlueFox
    BlueFox Posts: 15,251
    edited January 2009
    strider wrote: »
    Take off shoes and any metal jewelry.

    Take off shoes? And do what, stand barefoot in a pan of water? If you are trying to reduce a path to gound you need to increase your resistence, not lower it.
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  • george daniel
    george daniel Posts: 12,096
    edited January 2009
    BlueFox wrote: »
    Take off shoes? And do what, stand barefoot in a pan of water? If you are trying to reduce a path to gound you need to increase your resistence, not lower it.

    LOL,, after you master this task,young Jedi,,,you will be asked to bias tubes with the power on.;)
    JC approves....he told me so. (F-1 nut)
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