On 24/05/2017 03:16, Phil Allison wrote:

snipped for readibilty.

After asking the guy for more info about the speakers, as you asked what
there were, I now suspect the problem is his end* and he's getting it
back as it is.

But details anyway, since you asked.

If I feed it a 0.8v pp sinewave from my sig gen it doesn't clip at full
volume and doesn't go into protect.


** Are you using a dummy load ?

Please describe.

I was using a pair of 8 ohm 100W standard metal cased cermet WW
resistors on a big metal plate. One for each channel, obviously.

But it does the same with a pair of cheap Gale 3010S speakers as well.

Other than it being a touch quick to go into protect, does this sound
like it's actually working properly? Or at least as it was designed?


** Depends on that mysterious load.


See answer above

Where it's normally installed, it's paired with some very expensive
speakers


** And we are not allowed to know their identity either?

I have been told they are Kef R300, so not that expensive, but I
wouldn't like to be buying them. I don't know if they are good speakers
or not.

He runs them bi-wired, apparently. Personally, I fail to see why running
two pairs of cables to the same speaker from a paralleled pair of output
posts on the *same channel* makes any difference. But I'm sure it must
or they wouldn't do it
I have asked the guy to double check the wiring for problems**.



*assuming my sig gen is accurate, of course.

** Your scope should be accurate enough.

That a secret too?

The one I'm using for this is an old analogue Leader LS8050 50Mhz crt
scope. I do have a modern Rigol digital 'scope as well fwiw.


*Apparently, according to the guy, it's been "trigger happy" from new,
but it's been "more sensitive" after a recent speaker move.

** So I suspect the speaker wring, but he's plenty capable of sorting
that out.

I'm not interested in trying to deal with a potential design/build
issue. If he wants it modified he can find someone else to do that.