Just curious if someone might be able to explain this odd phenomenon I’m experiencing with my Directstream. For whatever reason it almost sounds like there’s a low pass filter, if you will, that cuts off sub bass frequencies when using the XLR output. When I switch back over to the single ended RCA output, I notice far deeper more extended bass. I don’t have anything to measure, but it’s as if anything under ~40hz doesn’t end up being sent out if I’m using the XLR output.
I’ve tested this two ways. I have two different speaker set ups. I’ll only explain how my desktop PC audio set up is, as I believe it reveals more about the issue. The Direcstream normally feeds a Parasound A21 via XLR, which powers a pair of Bowers & Wilkins PM1s. On the back of the A21 there is a “loop out” RCA connector if you wanted to send a single ended signal to another amp or, how it’s set up in my case, it’s feeding a pair of Bowers & Wilkins PV1D subwoofers (one for each channel). I simply set a low pass filter on the DSP of each sub to take over where the PM1s roll off. If I’m using the XLR output to feed the A21 I notice there’s a lack of sub bass. If I switch over to the RCA outs on the Directstream to the A21 things work as they should with full frequency output and deep bass extension. Alternatively, instead of using the loop out connectors on the back of the A21, I can use the RCA outs to feed the subs directly from the Directstream and use concurrently the XLR outs to feed the A21 for my PM1 speakers. Same results as if I were using the loop outs; nice deep extended bass as it should be.
It just seems like the smoking gun here is the XLR outs causing some sort of issue. Does anyone have an explanation? Has anyone else experienced the same issue?