Please specify types of all of
and type of cables used between them, along with any input / output gain control settings on the last 3.
This type of PA mixer would have been operated by trained professionals back in its day. If you have some prior experience operating a typical compact portable mixer (Behringer, Mackie, whatever), you should be able to figure it out using the manual (including studying the block diagram), but if you don't you may be in for a bit of a learning curve indeed.
Also, being an old PA mixer, it's not exactly the last word in noise, so proper gain staging will have to be observed. If the other equipment is similarly dated, Pin 1 Problem issues may also crop up.
My plan of action:
1. I would suggest using one of the stereo input pairs provided for simplicity's sake. If you USB DAC will output +8 dBu or less, engage the "-10" switch (which increases input sensitivity to consumer line level).
2. Make sure that all unused inputs are turned down.
3. The MASTER fader will be your main volume control. For normal listening levels, it should be at around -30 dB, maybe -40 (sort of depends on whether volume normalization like ReplayGain or similar is in use). Otherwise gains downstream may need adjusting.
Why this awfully complex setup anyway? EQ is perhaps best handled in the digital domain today, for example.
Hi, AnalogSteph
Thanks for your detailed answer!
I am using below audio eqipmenets.
Toppin E-30 (USB-DAC)
Spirits live 4 (Mixer)
DOD SR231Q Graphic EQ
Peavey V4X ELECTRONIC CROSSOVER
Several amps maded by S.Korea
JBL Speakers
I use RCA to TRS cable from DAC to Mixer and all others use TRS or XLR cables (Blanced).
Also i am not using Stereo as Input. I am using input and output like the screenshot below.
The EQ and XO gain(level) are set to 0, and the amp is set to maximum output.
XO is controlled frequency as 2 way (MF, HF).
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1.
Output of DAC (E30) is set to 0 dB by default. - dB is possible, but + dB is not possible.
I was turned on "Line -20dB button" becasue if not enabled that no sound.
Will enabling this button affect the noise?
2. All of unused input channel was disabled already.
3. -30 or -40dB is too low volume for me.
However, if i set it to -30 or -40db, there is still noise, but it can be minimized.
So, as a temporary measure, I raise the input gain to about 20, set the input fade to 0, and set the output fade to -30db.
But still the noise is not resolved.
4. I run a dance salon, and I bought all of these systems in bulk from another closed salon.
And even though the broken amplifier and woofer have been repaired,
noise of the speaker still has not been resolved.
I don't want to use such a complicated system, but there are different Woofer and Tweeter Units from different manufacturers.
So, I have no choice but to use it to keep the relatively identical output.
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I'm sorry my English is not good.
But I really want some advice. and happy new year!