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Old 09-18-2015, 04:51 PM
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Default Setting gains for discrete drivers/channels in a fully active system.

Full disclosure: I posted this question in another forum, but didn't get much of a response, so I will give it a try here....

I am planning on running my 3-way front stage fully active with a DSP. My question is what is the best way to set the amplifier gains, especially considering amplifier Power and driver Power don't necessarily match up. I will be using two 100x4 amplifiers. Tweets and 3" midrange will get 100 each from amp #1, midbasses will see amp #2 bridged at 260x2. It seems there are several possibilities on how to do this.

1. I could simply match all amplifier gains using the DMM method for rated power. I could then adjust the levels in the DSP.

2. I could set all amplifier gains to the rated driver power, using the DMM method. Levels would then be adjusted in the DSP.

3. Set amplifier gain to match power level of lowest power driver, setting other amplifier gains to bring levels down to said driver.

4.

Any comment or suggestions appreciated!
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Old 09-18-2015, 08:09 PM
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Start with the amplifier guys at minimum. Levels should be adjusted in the DSP to roughly align with the target you want to reach in terms of overall balance. Do your time alignment, crossovers, and EQ. After you've got the system sounding good it's a matter of turning up all gains the same amount if the system doesn't play loudly enough.
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Old 09-18-2015, 09:30 PM
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Quote:
Originally Posted by trumpet View Post
Start with the amplifier guys at minimum. Levels should be adjusted in the DSP to roughly align with the target you want to reach in terms of overall balance. Do your time alignment, crossovers, and EQ. After you've got the system sounding good it's a matter of turning up all gains the same amount if the system doesn't play loudly enough.
I think the DSP being used may be an issue in this equation though.
I have a PPI DSP 88R and all channels start out @ 0dB and some can't be boosted. If I turn all my gains to minimum I'd have to almost clip my HU to make measurements. I'm learning DSP though so I could be off base.

To the OP, was the no response forum DIYMA? Those guys are DSP fiends.
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Old 09-19-2015, 01:45 AM
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The 88r does start out individual channels @0dB Andythey can only be cut from there. However there is a master gain than can be boosted or cut.

I did post at Diyma. I thought I would have gotten a better response. Maybe all those guys have their installers set the gains for them!
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Old 09-19-2015, 02:32 AM
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I roughly set the gain for each channel at around 50% for mids and midbass and 25% for tweets. Then I implemented some basic crossovers in the DSP and took measurements of each speaker separately, making sure to maintain the same source volume. Once I started taking measurements and overlaying them to see how speakers looked relative to each other I adjusted the amp gains again just to get close. I ended up bumping everything up a bit when I was doing this too because I knew I would be cutting gain and EQ in the DSP. Once everything was very roughly set on the amps I did the rest of the level adjustment via DSP. I don't use a DMM for setting gain but if I was I would set all the channels for maximum gain, take some measurements, and adjust down from there on the amps and leave the DSP for fine tuning.
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