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Here's how I would check that out. Pick a test tone in the lower range which tends to take alot of power to produce. Establish the max volume you dare play, without letting the sub play more than a few seconds at a time. Next, measure line voltage (meter plugged into the same circuit as the sub amp) with the sub off as a reference. Leave the volt meter set up where you can read it. Then, play the test tone at a level which is as loud as you dare. AS mentioned earlier, you must be careful with this but if you just let it run for a few seconds then take your reading, then turn the test tone source off you should have a fair reading. All you are trying to do is get the amp's power supply to a point where it's at equalibrium, not just a quick hit supported by the caps (if it is going to sag you want to see the sag). This is the procedure, what you are looking for is a drop in voltage, I've used this for car audio as well. So your question is going to be, what is acceptable? Maybe others here can help with that. But do know, that sag in the voltage equates to heat in the wiring.I am able to clip the EP2500 on music fairly easily. I am wondering if my wall AC is getting taxed too much? I am going to EQ the subs soon after I get them upstairs into the living room. I am thinking of another EP2500 too. Will I have to run a dedicated outlet to them? If so, it will be very difficult.
With good wiring and proper breakers, it's tough to get it to sag much without tripping a breaker, at least without extended playing (the breaker will heat).