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Frankensoundsystem Bodge - Is it worth it?!
Frankensoundsystem Bodge - Is it worth it?!
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Old 23rd December 2017, 11:40 AM   #71
dokkodo is offline dokkodo
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having done a bit of reading around seems this problem could go deeper than my powers to fix it...


edit, gave it a whack, noise went away. will open it up and check connections manually...

Last edited by dokkodo; 23rd December 2017 at 11:56 AM.
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Old 23rd December 2017, 08:01 PM   #72
conanski is offline conanski  Canada
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Did you buy the DCX new or used? Earlier models has a problem with the ribbon connectors but re-seating them usually fixes that, and in some of those same early boxes people sometimes found some leads not cut short enough on the main PCB and they were touching the chassis. Again it's an easy fix, clip the leads and/or add a piece of plastic or mylar between the PCB and case.
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Old 23rd December 2017, 10:42 PM   #73
dokkodo is offline dokkodo
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It was second hand. It seems the noise has settled down so my feeling is it is a mechanical issue, Ill have a go at what you recommend anyway, worth making sure it doesnt come back mid-event.

Will annoy my family all christmas with sweep tests and be posting them soon once I understand whats going on.

thanks for the help!
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Old 24th December 2017, 10:07 AM   #74
bob4 is offline bob4  Germany
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Awesome!!! Happy to see you making progress!!
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Old 24th December 2017, 03:02 PM   #75
dokkodo is offline dokkodo
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I made a graph. Dont know if i did it right, or what it means, but i made one...
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File Type: jpg graph 1.jpg (64.5 KB, 38 views)
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Old 25th December 2017, 01:22 PM   #76
bob4 is offline bob4  Germany
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the scaling should be readjusted to -50 to 50 dB vertical, Horizontal boundaries 30 Hz to 20 kHz.

the cab seems to go down to 60 Hz flat.
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Old 26th December 2017, 07:52 PM   #77
conanski is offline conanski  Canada
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That graph looks reasonably good. I'd suggest adding some light smoothing until the graph looks like a single continuous line, the super detailed response fluctuations are not something you want or need to correct. And I would also suggest setting the vertical scale to something like 0-120 or 130dB.
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Old 28th December 2017, 04:24 PM   #78
bob4 is offline bob4  Germany
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Quote:
Originally Posted by conanski View Post
I'd suggest adding some light smoothing until the graph looks like a single continuous line, the super detailed response fluctuations are not something you want or need to correct.
may I politely disagree, and suggest two versions:

1) one without smoothing, scaling as I proposed
(purpose of this graph is to examine the crossover points, how the slot loaded 12s and the midhigh horn interact)

2) one with smoothing as proposed by conanski
(to get the big picture)

while we're at it, some measurements of the other, original cab to see which one works better!
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Old 28th December 2017, 06:51 PM   #79
dokkodo is offline dokkodo
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im afraid the original cabs are long gone! but ill be able to test both of these soon.

I have done some research but there doesnt seem to be any simple how-to articles, guess its a specialist field where everyone mostly knows what they are doing. whats the best measurement practice and setup, microphone distance etc... one cab at a time? both?

i guess the individual channel gains on the amp and all the DSP magic give me a certain amount of control too so it would be good to get measurements and adjust for best results...
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Old 28th December 2017, 10:18 PM   #80
conanski is offline conanski  Canada
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Quote:
Originally Posted by dokkodo View Post
whats the best measurement practice and setup, microphone distance etc... one cab at a time? both?
First thing you need to understand is that if you measure indoors you are always measuring the speaker and the room and there is no way to separate them. That is fine is these will always be used in the same room and won't move once installed, in that case put them where they are going and then decide if you want to setup for a single sweet spot listening position or for a more general full room response.
If however these will be mobile then you need to get them outside away from buildings and then you can accurately develop some baseline correction which will time align the drivers and correct response anomolies.
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