Hypex NC400 - everything is high pitched?

[infy]

I've got the amps assembled and out of standby. However, everything played back is high pitched. Sounds like it's playing from an awful cellphone...

But coming out from the Klipsch towers.

There's almost no bass... it's there when you put your ear up to the woofers but not much else.

When I take the same source and connect it to another amp - it sounds normal. But when I connect the NC400 it's awful again.

Sounds like something isn't wired up quite right.

I'm going from:
DAC to RCA -> RCA to XLR adapter -> NC400 Amp

XLR to amp pins:
Shield, White, Blue

Both left and right channels are behaving the same. Both NC400 modules are affected.

The XLR adapter looks like the photo attached.

Any thoughts?

 

[brig001]

The Hypex inputs are balanced, so it will only amplify the difference between the signals on the XLR. The lead you have looks like you are feeding stereo to the XLR, so you will only get the difference between left and right, and bass is usually mono so there won't be any. Try unplugging one phono plug and shorting the pin to the sleeve on it

Brian

 

[TNT]

Yes, thats most likely the wrong adapter. You need 2 of these, one for each channel.

https://encrypted-tbn0.gstatic.com/...KX2U-rZYvcXeYA3di8y1Gk5_Da1burPowiSw&usqp=CAU

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[infy]

Try unplugging one phono plug and shorting the pin to the sleeve on it

Before I go shorting wires on expensive gear.. is the attached image accurate?

I think you guys are right about the adapter.

Is there a name for the cable type I need? Or do I need to build one?

I just ordered one of these to try. I'll return it if it doesn't work.
Amazon.com: Monoprice XLR Male to RCA Male Cable - 6 Feet - Black with E21Gold Plated Connectors | 16AWG Shielded Twisted Pair Oxygen-Free Copper Braid Conductors - Premier Series, 104777: Home Audio & Theater

 

[Koifarm]

The amazon cable will do the job.

See also rca to xlr adapter below

 

[TNT]

No, skip any cable with 2 RCA. To my recollection there is no standard connection for such cable. A three pole XLR is always for one channel.

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[infy]

Bingo. Thats' the cable you need for anyone browsing in the future.

Thanks for the advice. I've learned something today.