In article ,
tony sayer wrote:
In article , Dave Plowman (News)
scribeth thus
In article ,
Fredxx wrote:
On 21/04/2019 00:15, Dave Plowman (News) wrote:
In article ,
tony sayer wrote:
I can't be certain the Behringer unit is faulty. The amplifiers
are home made, and it could be some interaction I've not fathomed
out.


Right!, so the crossover then goes to some home-brew amps if so
what are they and are they bal or unbal inputs?..

Balanced. Using THAT1240 ICs. The whole idea being to avoid ground
loop problems...

They have some serious CMRR.

I doubt the X/O has anything like that?

I didn't recognise the number on the balance ICs in the X/O.

I have loads of SSM 2143 I could try, though, on the amp. But I've not
had problems with either before.


Wouldn't surprised if they were pin compatible!..

They are. I was led to believe the THAT had a better performance than the
SSM.

Because the cable run is so short, I've just used the most basic
circuit for the THAT1240.

But

It really shouldn't matter those sorts of chip can take balanced lines
up to miles long if need be!..

Quite. I've used them for lots of things with no problems. I have 5 stereo
pairs of audio running round the house. Cable is multicore telephone cable
- no screens at all. Driven by SSM2142, and picked up in several locations
by either SSM2143 or THAT1246. Can have 8 sitting across the same line
with absolutely no problems at all.


I've got/getting rather then theres something odd with the power supply
for these somewhere?..

Can you describe it in more detail?..

Mains ground goes to the closest chassis point. All the DC grounds and
signal grounds go to a star ground point which is in turn grounded to the
chassis at only one point.

--
*Just give me chocolate and nobody gets hurt

Dave Plowman London SW
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