Sound card calibration with 1-channel Volt audio interface and PC+Amplifier

thoraxe

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Main Amp
Yamaha RX-V379
Computer Audio
PC soundcard
Front Speakers
Definitive Audio
Subwoofers
Definitive Audio
My PC drives a Yamaha AV receiver (2.1 setup) and I'd like to use REW to calibrate for my room. I don't have any sound treatment so the success will be limited, but sound treatment is coming, so why not start now?

The thing I'm trying to understand is how to do the sound card calibration with this particular setup. Since my audio interface is not driving the speakers, and is only used for the microphone (Dayton EMM-6), it seems that I would have to take the output from my PC soundcard before it goes into my AV receiver and run that into the input of the Volt.

This presents its own set of challenges:
* The PC sound card only has 1/8"-type outputs
* The Volt-1 has a TRS/XLR input with +48V phantom
* Using the EMM-6 requires enabling the +48V phantom
* I don't think I can use the +48V when running the PC speaker into the Volt
* I would need to convert the 1/8" connector to a 1/4" TRS, and the cable would end up being relatively long (~8-10'), and I'm not sure I can use a balanced cable in this setup

Can someone explain to me what the best thing to do is here? It seems like at a minimum I need to adapt the 1/8" output on the PC sound card to the 1/4" TRS input on the Volt.

* Is that all I need to do?
* Is it a problem that the +48v won't be used when plumbing the PC out into the Volt?
 
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