From Newsgroup: uk.rec.audio

Got one of these X-overs driving my modified LS5/8.

RH LF output has developed a hiss/crackle. When I first heard it thought
it was rain outside. So beneath the wanted audio, level wise, but very annoying.

Mute all (inputs and outputs) makes no difference to this noise. And there
does appear to be more hiss than usual on the MF and HF. And the other
three outputs.

So wondering if it is on a PS rail? When the mutes don't kill it? Can't
find a schematic for it.

It's quite a pricey item (for Beyringer) Anyone recommend a decent repair place? I'll have a look inside for any obviously popped caps etc, but
since it's likely surface mount stuff about my limit, fault finding wise.
--
*Frustration is trying to find your glasses without your glasses.

Dave Plowman dave@davenoise.co.uk London SW
To e-mail, change noise into sound.
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From Newsgroup: uk.rec.audio

On 20/09/2022 14:08, Dave Plowman (News) wrote:

Got one of these X-overs driving my modified LS5/8.

RH LF output has developed a hiss/crackle. When I first heard it thought
it was rain outside. So beneath the wanted audio, level wise, but very annoying.

Mute all (inputs and outputs) makes no difference to this noise. And there does appear to be more hiss than usual on the MF and HF. And the other
three outputs.

So wondering if it is on a PS rail? When the mutes don't kill it? Can't
find a schematic for it.

It's quite a pricey item (for Beyringer) Anyone recommend a decent repair place? I'll have a look inside for any obviously popped caps etc, but
since it's likely surface mount stuff about my limit, fault finding wise.

https://www.synthxl.com/behringer-dcx-2496/
--
Adrian C
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From Newsgroup: uk.rec.audio

On Tue, 20 Sep 2022 14:08:13 +0100, "Dave Plowman (News)" <dave@davenoise.co.uk> wrote:

Got one of these X-overs driving my modified LS5/8.

RH LF output has developed a hiss/crackle. When I first heard it thought
it was rain outside. So beneath the wanted audio, level wise, but very >annoying.

Mute all (inputs and outputs) makes no difference to this noise. And there >does appear to be more hiss than usual on the MF and HF. And the other
three outputs.

So wondering if it is on a PS rail? When the mutes don't kill it? Can't
find a schematic for it.

It's quite a pricey item (for Beyringer) Anyone recommend a decent repair >place? I'll have a look inside for any obviously popped caps etc, but
since it's likely surface mount stuff about my limit, fault finding wise.

Matter of course with Behringer. Replace all the electrolytic caps in
the power supply with decent ones. Nichicon, Rubycon and Panasonic
will be the ones to go for.

d
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From Newsgroup: uk.rec.audio

Dave Plowman (News) wrote:
=========================

Got one of these X-overs driving my modified LS5/8.

RH LF output has developed a hiss/crackle. When I first heard it thought
it was rain outside. So beneath the wanted audio, level wise, but very annoying.

Mute all (inputs and outputs) makes no difference to this noise. And there does appear to be more hiss than usual on the MF and HF. And the other
three outputs.

** Google " DCX2496 frying noise ".

It's a common fault due to a bad ribbon cable and or lack of insulation under one of the PCBs.


..... Phil

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From Newsgroup: uk.rec.audio

How is it powered. I find anything powered by USB directly from a puter is incredibly noisy. A separate good quality psu usually is a good move.
Brian
--

--:
This newsgroup posting comes to you directly from...
The Sofa of Brian Gaff...
briang1@blueyonder.co.uk
Blind user, so no pictures please
Note this Signature is meaningless.!
"Dave Plowman (News)" <dave@davenoise.co.uk> wrote in message news:5a2ae68defdave@davenoise.co.uk...

Got one of these X-overs driving my modified LS5/8.

RH LF output has developed a hiss/crackle. When I first heard it thought
it was rain outside. So beneath the wanted audio, level wise, but very annoying.

Mute all (inputs and outputs) makes no difference to this noise. And there does appear to be more hiss than usual on the MF and HF. And the other
three outputs.

So wondering if it is on a PS rail? When the mutes don't kill it? Can't
find a schematic for it.

It's quite a pricey item (for Beyringer) Anyone recommend a decent repair place? I'll have a look inside for any obviously popped caps etc, but
since it's likely surface mount stuff about my limit, fault finding wise.

--
*Frustration is trying to find your glasses without your glasses.

Dave Plowman dave@davenoise.co.uk London SW
To e-mail, change noise into sound.

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From Newsgroup: uk.rec.audio

Brian Gaff PITA wrote:
==================

How is it powered.

** The Behringer unit is built into a 1RU box with a decent size SMPS module outputting +5V and +/-15VDC.



..... Phil





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From Newsgroup: uk.rec.audio

Thanks guys - worth me having a look inside, then.
--
*I can see your point, but I still think you're full of shit.

Dave Plowman dave@davenoise.co.uk London SW
To e-mail, change noise into sound.
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From Newsgroup: uk.rec.audio

Some with nothing better to do might remember I had a problem with one of these. It's an active three way speaker crossover. Started hissing and crackling on all outputs - and the mutes made no difference.
It was confirmed to be most likely the power supply - so changed all the
caps. Which sorted it. For about a few months. Now back again - same
fault. Most likely problem is the +/- 15v rails feeding the balanced
output stages?
I'd found a schematic for the unit online, but didn't include the PS. So
did some more Googling and found that in an article on upgrading it. So
I've ordered up the parts needed to do this.
Another article said it might be overheating. There are no vents to the
case - but it's hardly a high current unit. And in my case not near
anything that gets hot.

Other thing that was said is Behringer use crap caps - branded XUNDA. But
the replacements I used were all Panasonic FM series.

What I didn't do was replace the ceramics in parallel with the caps on the outputs of the two 15v regs. So will do this time.

The article on updating showed some impressive improvements in ripple and
noise on the PS rails. So hoping that makes things better - the unit did
add some noise to the power amps.
--
*Why is a boxing ring square?

Dave Plowman dave@davenoise.co.uk London SW
To e-mail, change noise into sound.
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