Common ground amps

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

Got a multimeter? Super easy to figure that out.

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Originally Posted by dorokusai

Got a multimeter? Super easy to figure that out.

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I'm listening, keep going.

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.

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.

Thanks ShinAce & strider

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Originally Posted by strider

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.

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Will it be the same with my 5 channel amp as well?

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Originally Posted by ShinAce

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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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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Originally Posted by leroyjr1

Will it be the same with my 5 channel amp as well?

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Should be.

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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Originally Posted by strider

Take off shoes and any metal jewelry.

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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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Originally Posted by BlueFox

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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LOL,, after you master this task,young Jedi,,,you will be asked to bias tubes with the power on.;)