Solved! Pre-amp board connection.

Varun_27

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May 18, 2017
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I have a 7.1 pre-amplifier and have to connect 8 different mono amplifiers to it (as i couldn't find a 7.1 amplifier for it), one for each channel like FL, FR, BL, BR, SL, SR, Centre and and Subwoofer.
Every input for amplifier needs one + terminal, one - terminal and/or one GND terminal but my pre-amplifier has outputs BR, BL, CEN, SW, SL, SR, FL, FR and one GND only. How to connect them?
 
You're at this again? The ground is shared by all the outputs so you treat them as unbalanced outputs.
If your preamp is unbalanced (RCA outputs) and your amp is balanced (XLR) you can get a cable with RCA at one end and XLR or TRS at the other.
https://www.amazon.com/Monoprice-Connectors-Shielded-Oxygen-Free-Conductors/dp/B001VLW398
There are also converters
https://www.neutrik.com/en/product/na2f-d2b-tx
https://www.parts-express.com/art-cleanboxpro-stereo-balanced-unbalanced-converter--245-868
It would have been easier to buy an amp with unbalanced inputs.
Have fun.
 

Varun_27

Prominent
May 18, 2017
52
0
580
0
MERGED QUESTION
Question from Varun_27 : "Pre-amplifier board connection."

I have a 7.1 pre-amplifier and have to connect 8 mono amplifiers to it (as i couldn't find a 7.1 amplifier for it).
My problem is that every amplifier input signal needs one + terminal, one - terminal and/or one GND terminal. But my pre-amplifier output has BR, BL, SW, CEN, SR, SL, FR, FL and GND (GND one only).How do i connect them?
 
You're at this again? The ground is shared by all the outputs so you treat them as unbalanced outputs.
If your preamp is unbalanced (RCA outputs) and your amp is balanced (XLR) you can get a cable with RCA at one end and XLR or TRS at the other.
https://www.amazon.com/Monoprice-Connectors-Shielded-Oxygen-Free-Conductors/dp/B001VLW398
There are also converters
https://www.neutrik.com/en/product/na2f-d2b-tx
https://www.parts-express.com/art-cleanboxpro-stereo-balanced-unbalanced-converter--245-868
It would have been easier to buy an amp with unbalanced inputs.
Have fun.
 
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