Hi Bill -

They are not Speakerlink 8ks, though I suppose I could swap channels 1/2 per your advice to see if it makes any difference.

I was also thinking of swapping the heads on the two 8ks, thinking this might be able to give me an idea of where the problem is located.

They are almost definitely not under warranty. I received these as a gift from my father when he upgraded his system, and M came over to calibrate these. They told me that these were the first pair of 8ks sold in the US, so I guess there are sentimental reasons to get these working as well smile

Anyhow, if I am looking at a board replacement, or something along those lines, anyone have any ideas of what the costs involved are?

Speaker Systems:
1. 2xDSP 8000s, DSP 5500C, 861v4, HD621
2. 2xDSP 6000s, HDMI Switch > Atlona HDMI De-embedder
Headphone Systems:
1. Audeze LCD 3, Stax 009, Chord 2Qute > Violectric 281 > Stax 717
2. Audeze LCD XC, Fostex TH900, Bel Canto Reflink > Chord Hugo > CI Audio Passive Pre, Auralic Taurus
Sources:
Oppo BDP 93 and 83, Project Carbon TT, J River