configure amp 4 or 8 ohm to drive 6 ohm speakers

Thanks for the input. I just got through opening up the amp and did some re-wiring. I added some internal connectors so I can switch between 4 and 8 ohms a little more easily but you still have to take the bottom off to do it, so not a very quick thing.

Sonically, I'm not sure how the switch came out. I had been using it on the 8 ohm tap for the last couple of years on these speakers. It sounded great on the 8 ohm tap, and it sounds great on the 4 ohm tap. I wish my memory was better for comparisons like this but I have a hard time in that area. I do belive my volume control is higher now for the same speaker output. That sounds right, doesn't it? I am only going by what the seller told me to think it was on 8 ohm in the first place. What I encountered inside was the green wire taps were connected and I swapped to yellow, in case anyone is familar with these transformers.

I'll live with it this way (4 ohm) for now and maybe try a comparison back to 8 again someday.

Rrog, I found one review online where the measured output imp with the 8 ohm tap was 4.4 @1khz. There was no measurement for the 4 ohm tap, maybe it would be around 2.2 or so.

Anyway, I've had 2 listening sessions since switching to the 4 ohm tap and midway through the 2nd I was convinced the soundstage was smaller and some dynamics were lost. OK, I'm no expert with these reviewer terms but to me it just didn't sounds as good. I powered the amp off and turned it on it's side, gee it's heavy, took off the bottom and switched it back to the 8 ohm tap. Just as I thought, I like the sound better.

It seems the more I read on the internet about audio equipment the less I know. In this case I believe I increased the damping factor when I tried the 4 ohm tap. It should have been basically doubling it, from 1.36 to 2.7. When I read certain articles this should have been goodness, and I should have found it superior. Why do I like the sound of the music better with a lower damping factor? And also, according so some things I have read either of these low damping factors is abysmal and should sound like crap. I suspect there are many complicated factors going on here and there may be others that outweighed the damping factor. And I do understand the impedance of my speakers may be all over the charts across the audio spectrum. I'll keep trying to learn this stuff. Nothing better to do.