Well after a LOT of messing around with the amps i already had, and eventually just buying another one, a six channel power amp, to tri-amp with...
I have FINALLY fired up the speaker I have built...
And it sounds......
Great! full, tight bass, and definitely plenty loud!!
Or maybe I am just high from so much time and finally getting a reward. Makes you want to listen to everything!
By ear, been listening to some nicely produced music and so far i am happy (glenn adams - 'a beat for you' sounds amazing, the drum fill at the beginning really made me happy). Took me a while to figure out the DSP, I have just used the original Xover points, none of the more advanced functions yet. Also took a while to remember to mono my laptop, thought something was 'missing' for ages, only using one speaker... d'oh...
Will use the reference mic I bought to do some real tests for you over christmas, if I can figure that all out.
There is an issue with noise coming from somewhere, which starts sounding like a light storm and then would progress to a raging hurricane, loud with lots of interference-y fuzz, had to turn off a few times but now i've had music playing for a while it seems to have stabilised. When nothings playing/music is quiet you can definitely hear it though. Goes away when you turn off the DSP, does that mean its coming from DSP or before in signal? Grounding problem? I am going from laptop to audio interface to DSP to amp.
Got a big party to play tunes at on these on new years eve, so I better get on with building the next one....
I have FINALLY fired up the speaker I have built...
And it sounds......
Great! full, tight bass, and definitely plenty loud!!
Or maybe I am just high from so much time and finally getting a reward. Makes you want to listen to everything!
By ear, been listening to some nicely produced music and so far i am happy (glenn adams - 'a beat for you' sounds amazing, the drum fill at the beginning really made me happy). Took me a while to figure out the DSP, I have just used the original Xover points, none of the more advanced functions yet. Also took a while to remember to mono my laptop, thought something was 'missing' for ages, only using one speaker... d'oh...
Will use the reference mic I bought to do some real tests for you over christmas, if I can figure that all out.
There is an issue with noise coming from somewhere, which starts sounding like a light storm and then would progress to a raging hurricane, loud with lots of interference-y fuzz, had to turn off a few times but now i've had music playing for a while it seems to have stabilised. When nothings playing/music is quiet you can definitely hear it though. Goes away when you turn off the DSP, does that mean its coming from DSP or before in signal? Grounding problem? I am going from laptop to audio interface to DSP to amp.
Got a big party to play tunes at on these on new years eve, so I better get on with building the next one....
so i have been using my saffire pro 40 interface for about 10 minutes this morning, all was well until the snowstorm just came back. bad fuzz, some popping and squeaking, eventually dropping out, coming back. worrying!
turning off the interface doesnt do anything, but turning off the behringer does.
it seems to be something that gets worse after a bit of use, heat related? bad connections?
will wait and see if it reduces again as it did yesterday
turning off the interface doesnt do anything, but turning off the behringer does.
it seems to be something that gets worse after a bit of use, heat related? bad connections?
will wait and see if it reduces again as it did yesterday
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.
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!
Will annoy my family all christmas with sweep tests and be posting them soon once I understand whats going on.
thanks for the help!
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.
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!
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...
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...
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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