Hissing from DCX2496
Printed From: Speakerplans.com
Category: General
Forum Name: Electro Frying Forum
Forum Description: Talk about drivers, processors and mixers
URL: https://forum.speakerplans.com/forum_posts.asp?TID=108215
Printed Date: 27 March 2026 at 7:52am
Software Version: Web Wiz Forums 12.08 - https://www.webwizforums.com
Topic: Hissing from DCX2496
Posted By: JRJ
Subject: Hissing from DCX2496
Date Posted: 06 December 2023 at 2:18pm
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My DCX2496 (from 2005) has a quite loud hissing on some channels. Input A - not so much Input B - pretty much Input C - too much Doesn't seem to matter that much how I route the inputs/outputs, it's the inputs that's making the majority of the hissing. Is it the common problem with the flat cables perhaps? Visually they look OK, and when bending them a bit back and forth the sound popped/sparkled a bit at first, but the hissing was still there. Also read some stuff about changing the caps on the power supply board? Seems to be a ton of problems with "frying egg" sound, but I'm not really sure what that is supposed to sound like...?
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Replies:
Posted By: Earplug
Date Posted: 06 December 2023 at 6:23pm
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I think that the "frying egg" noise is a general crackling and hissing on the unit. One of my DCX first lost Input A, which wasn't too big a problem, as I just swapped to B & C, but then O/P 6 started crackling, so I replaced the main flat cable and that seemed to cure all the problems, although it's been a while since I've used that unit. At the moment, it's just an emergency spare. So the bottom line is the main flat cable causing these issues. Best to replace - and solder in rather than use the multipin connectors. ------------- Earplugs Are For Wimps! |
Posted By: Conanski
Date Posted: 06 December 2023 at 11:20pm
How are you using or planing to use this processor? It does have a bit more self noise than some other processors but in use for PA applications it not a big deal once everything is setup. Also note that whatever channel is setup to pass high frequency content and has HF drivers attached will exibit more hiss, that could be some or all of the outputs depending how the processing is setup.
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JRJ wrote:Posted By: kedwardsleisure
Date Posted: 06 December 2023 at 11:32pm
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certainly I would check the power supply for the usual bulging or leaking capacitors especially if the unit has been used in an installation where it's spent most of its time powered up: capacitors lifespans are rated by a product of temperature and time. Also the obvious thing that creates spurious noise is liquid damage or corrosion. Replacing both ribbons and their IDC pluggable and pcb transition connectors is the next thing, if you're confident you can do it without damaging the pcb. Proper, branded cable and connectors eg fujitsu, 3M, harting. TE etc are the way, not generic rubbish from amazon, aliexpress or other outlet. The frying egg noise is due to imperfect contact between the IDC forks and the ribbon cores. Great for digital connections on IDE hard drives but for audio the contact must be consistently intimate. ------------- Kevin North Staffordshire |
Posted By: fat_brstd
Date Posted: 06 December 2023 at 11:33pm
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Remove and re-seat the ribbon cables on the inside of the unit. Often hissing/frying egg sound from these is due to corrosion on the contacts of the internal ribbon cables and taking them out and putting them back in will fix it. This is a known issue with these units. ------------- Melbournes Rootical Warrior Roots - Dub - Steppers http://www.facebook.com/adrians.wall" rel="nofollow - facebook page |
Posted By: JRJ
Date Posted: 07 December 2023 at 7:54am
Ok, so both input C and output 6 came back to life after that? Seems to be a ton of info about the flat-cable-issues with the DCX2496, so that can surely be my problem as well.
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Posted By: JRJ
Date Posted: 07 December 2023 at 8:02am
I'm just using it in my hobby-rig for garden parties, school-discos, and similar. 15" sub and 12"/2" tops so no hifi-rig but still annoying with the hissing. No I haven't isolated the inputs from the outputs, but when changing the routing between the inputs/outputs in the way it's possible in the setup menu, I got the impression it was more related to the inputs but I haven't done any more testing then that.
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Posted By: JRJ
Date Posted: 07 December 2023 at 8:04am
OK, I'll check the caps as well then. I bought it used so I have no idea how it has been used in the past.
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Posted By: JRJ
Date Posted: 07 December 2023 at 8:08am
I did remove the flat cable contacts and fiddled a bit with the cables, and it got a bit better but it's still hissing quite a bit. Stupid thing that you can't unplug both ends of it, I'll remove the PCB and see if I dare bring out the soldering iron...
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Posted By: Earplug
Date Posted: 07 December 2023 at 9:21am
Input A, but yes - changing the cable sorted out all the problems. Saying that, as Mr. Edwards mentioned, also take a look at the caps on the PSU. You never know... ------------- Earplugs Are For Wimps! |
Posted By: Xoc1
Date Posted: 07 December 2023 at 1:07pm
| Take care inside the DCX - as the Switch mode PSU has some exposed capacitor tops that are at high voltage. |
Posted By: Stigbergets_Sweden
Date Posted: 02 January 2024 at 12:19pm
| Has anyone bricked a eeprom with the Ultradrive Pro DCX2496? Mine seems to have stopped responding and won't boot, I have another unit and can swap out the memory chip then the unit starts without problem. |
Posted By: monkeypuzzle
Date Posted: 02 January 2024 at 4:46pm
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Yep, I fried one by upgrading the firmware to a version that the unit couldn't take. I have a vague memory that I got it going with a working eeprom and whilst it was live took the eeprom out,put the bricked on back in and loaded the correct firmware. Either that or there was a funny button press combination on startup. Sorry that wasn't helpful but I found all the info I needed to do it online. Sear h bricked dcx on here.
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Posted By: monkeypuzzle
Date Posted: 02 January 2024 at 4:58pm
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Here's the thread https://forum.speakerplans.com/have-i-just-bricked-my-dcx-2496_topic104450_post1034930.html?KW=Bricked+dcx#1034930" rel="nofollow - https://forum.speakerplans.com/have-i-just-bricked-my-dcx-2496_topic104450_post1034930.html?KW=Bricked+dcx#1034930 You'll need a laptop with a serial port on it and a 9 pin serial D cable to USB or a computer/laptop with a 9pin d on it. You can pick up a very cheap old toughbook. ------------- blah blah blah blah blah...... |
Posted By: APW
Date Posted: 02 January 2024 at 5:12pm
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If it’s the older version of the DCX (The one with the memory slot on the front under the Mute, Store and Recall buttons) you can only install up to firmware Ver 1.16, anything newer bricks the unit... |