Hi everyone,
I had some issue with SQ-7 32/16
There Are the spikes shown in all input suddenly during show
I did factory reset, and going normal for few days, and that issue happen again.
This issue happen when mostly use phantom power +48 for input instrument.
Anyone who have experienced about this issue or similar?
And What are a few things that are causing this?
Please advise, thank you.
Was there only the red blinking lights on the channel meters, or were there also audible distortions?
A reloading the show didnât restore the normal state?
If you can rule out the possibility that unintentionally received MIDI commands could have triggered any missettings, then itâs almost certainly a hardware problem, and you should contact your dealer.
Since itâs probably a fairly new console, hopefully, it will be a quick exchange/repair.
thank you for respons,
yes, there also audible distortions, very loud.
even use new show, still have spikes, and i was thinking this causing of phantom power +48
Do you have a stage box attached to the console?
If so, while the channels on the desk are still overloading, can you unplug the Cat 5/6 line going to the stage box to see if that stops the channels from spiking? Obviously make sure all channels are muted, as well as any amplifiers or powered speakers that may be connected.
If this returns the channels to a normal state, then that in theory rules out the console (though could be a problematic SLink port I guess) and points toward a problem with the stage rack or even just the Cat line itself (hopefully).
Also worth trying is running power from a completely different source if possible. Run completely different extension leads from a different room if you can. Something that in theory should be on a different electrical circuit.
Extra thoughtâŚ
Are you in a venue/establishment that might have anything come in here and there that could use a lot of power, such as catering? Any renovations happening? Iâve had strange issues before when either of those situations have occured. Nothing like what you are experiencing, but you canât rule anything out.
No we donât use any stage box, but we use local input and output on surface.
we did separate power and difference power breaker for every department, i was thinking use power stabilizer for this case, maybe this idea can help, is that correct?
Dang! So that rules out a problematic stagebox/multi then.
Although, in saying that, have you tried to see if the problem disappears when unplugging channels one by one from the back of the mixer? Outputs too if necessary.
Do you have access to a power stabiliser/smoothing device? If you have one already, or can borrow one to test, then I would recommend it. No harm in trying it out to see.
Iâd be reluctant to suggest purchasing one in case it isnât the problem, unless of course you have unreliable power wherever you are? In which case it is always good to have something that smooths the power to something more stable.
if unplug and i use input from USB - DAW to surface 32 channel work well, i did and i test 3-5 hours long, no problem, if input local surface especially use phantom power +48 then issue happen again.
we donât have it for now, in the future if after this issue solve will get it to have something more stable.
So, if you temporarily disable phantom power on all channels, the distortions wonât occur?
i try use USB input from DAW, that wonât occur for 3-5 hours repeat playing, but havenât try from local surface without phantom power one by one
If you suspect the problem might be related to phantom power, it wouldnât hurt to check this to narrow down the cause.
However, I still assume that even with this knowledge, you wouldnât be able to fix it yourself.
Have you only activated phantom power on the inputs where itâs needed, and are only microphones connected to those inputs?
we did phantom power to input what we need, one or two channel only, but spikes affect other channels input without phantom power.
Even though I still suspect itâs a hardware issue and an exchange/repair of your relatively new console would certainly be straightforward, I want to ask a few more questions.
So it really was only one or two condenser microphones that required phantom power?
What do you mean by âspikesâ: relatively high signal levels (peaks) from the two condenser microphones, or signals from them that are too high and already clipping?
And if you unplug these both microphones or turn off their phantom powers, do all the other channels work correctly and without any problems?
Is the problem only present in all other channels when these two channels have excessively high levels?
And is phantom power definitely disabled on all other connected input channels??
And are all inputs (especially those with phantom power enabled) connected exclusively to sources with properly balanced outputs, using correctly wired balanced XLR cables?
even i connect only one channel use phantom power affect to other channel input, yes spike means clipping mostly all blink red, if i disable phantom power back to normal input source without any problems.
we use XLR balance cable with properly ground, i contact support Allen & Heath about this case, and they will send part to solve this issue.
Thank you for this information - Itâs great that A&H can help you in this way.
And it even sounds like they knew right away what caused the problem.
It would be good to post the fix on here in due course for completeness.
Dave
Hi Dave,
Will update if the part will arrive and will do test for completeness, thank you
I am intruged as to what âuser replaceable partâ this could possibly beâŚ
Dave
