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  • Behringer DCX 2496

    From Dave Plowman (News)@dave@davenoise.co.uk to uk.rec.audio on Tue Sep 20 14:08:13 2022
    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.
    --- Synchronet 3.21d-Linux NewsLink 1.2
  • From Adrian Caspersz@email@here.invalid to uk.rec.audio on Tue Sep 20 18:44:36 2022
    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
    --- Synchronet 3.21d-Linux NewsLink 1.2
  • From spam@spam@spam.com (Don Pearce) to uk.rec.audio on Tue Sep 20 18:33:39 2022
    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
    --- Synchronet 3.21d-Linux NewsLink 1.2
  • From Phil Allison@pallison49@gmail.com to uk.rec.audio on Tue Sep 20 15:28:32 2022
    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

    --- Synchronet 3.21d-Linux NewsLink 1.2
  • From Brian Gaff@brian1gaff@gmail.com to uk.rec.audio on Wed Sep 21 09:32:28 2022
    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.


    --- Synchronet 3.21d-Linux NewsLink 1.2
  • From Phil Allison@pallison49@gmail.com to uk.rec.audio on Wed Sep 21 01:43:43 2022
    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





    --- Synchronet 3.21d-Linux NewsLink 1.2
  • From Dave Plowman (News)@dave@davenoise.co.uk to uk.rec.audio on Wed Sep 21 13:59:42 2022
    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.
    --- Synchronet 3.21d-Linux NewsLink 1.2
  • From Dave Plowman (News)@dave@davenoise.co.uk to uk.rec.audio on Wed Jan 11 18:55:40 2023
    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.
    --- Synchronet 3.21d-Linux NewsLink 1.2