Another stupid question: I'm using a QSC PLX1804 (550 @ 8 ohms/ 800 @ 4 ohms) with two Yamaha S115v's on channel 1, and two Peavey PR-12's on channel 2. The Yamahas are rated at Power handling 500 watts program, 1,000 watts peak, and the PR-12 are rated at 400 watts program/ 800 watts peak. Since they are daisy-chained, two per channel, the amp is seeing a 4 ohm draw, correct? Mike Pyle, who sold me the QSC, said it was a great match for the Yamahas, which it is. My concern is for the Peaveys – I don't want to blow the tweeters (again*). I usually run the gain on channel 1 at about 1 O'clock, and the monitors at about noon. The LED cluster in the amp never shows clipping, it occasionally shows at the -10 dB meter mark. Are these levels safe for my speakers? We're never sick loud or anything, and only vocals and backing tracks through the system. Is there a better way to do this, or should I get a separate amp to run the monitors?* p.s. - Could I have blown the Peavey tweeters at that power level? I didn't think they were getting too much signal, but they were blown when the talking monkey at Guitar Satan "tested" them (with a 9-Volt battery across a 1/4" phone plug, which I understand will blow tweeters)Thanks,Bob
The PR12 peaveys have a light bulb inside that is supposed to protect the tweeters. Are you sure the tweeter is blown and not just the bulb?
I probably should have checked that, but was afraid of voiding the warranty. The tech I took them to yesterday said it might just be the light bulb. Fingers crossed. Any advice on the power vs. wattage?Thanks.
I would go a step further and ask what 1/4" jack attached to what. That type of test isn't reliable, and at the very least needs to be run with a tap of the leads attached directly to the compression driver.Remove the back plate and check for a "bulb" safety device. If you find one take your meter and check for continuity. Open = bad, closed = good. If that's not enough then take the cabinets to a speaker shop that has a signal generator. Have them test through the crossover, and then through each driver.400 watts isn't enough to kill those cabinets if you can keep them from clipping and the system is powered off and on properly. Keep in mind though that not enough power can be a worse condition than too much power. 2x times the long term rating is a good rule to follow.
The power thing - those PR-12 are getting 800 watts at 4 ohms, daisy-chained. I'm asking if it's safe to run them at 1/2 the amp level (400 watts?).Thanks.
The power thing - those PR-12 are getting 800 watts at 4 ohms, daisy-chained.
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