Al, thanks - now I got it. I forgot that this power amp is fully balanced. In that case this amp is in the signal path for RCA input, but not for the XLR.
SE vs Balanced volume
With my tube amp, when I switch between RCA & XLR, the XLR is louder. With my SS amp, when I switch between RCA & XLR, the volume is the same. The specs for the SS amp state that the amp is fully balanced. Here’s a photo of the innards behind the RCA & XLR inputs of the SS amp. XLR is on the left, RCA on the right, the yellow wires go to the external toggle switch. Why the different results? Thx.
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If you guys look at the shielded cable soldered connection you'll see it's one live and two connections to the ground plane making it single ended. https://onedrive.live.com/?authkey=%21AGcHA6Bqk4TpTLo&cid=31799128EF335049&id=31799128EF335049%2127368&parId=31799128EF335049%21117&o=OneUp Cheers George |
That’s could be right also Al, didn’t look at it from that angle, just saw the shielded cable going to that point. In any case I wouldn’t like to have that single ended INA134 in the signal path on my amp/s. And as I said before if the amp was full balanced they would have used the INA2134 to get balanced output from the opamp even then, yuck!. Cheers George |
- 48 posts total