Question about Crate FlexWave FW15 Guitar Amp Combo, 15 Watt Single 8 Speaker

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I have a Crate PA-8 4 ohm 150 watt PA head that I run to four Peavy 10" PA speakers (two per side in series). It was very good, clean sound, but the speakers were cheap and may have been pushed too hard - I get fuzzy sound from a few of them (hence my belief it's the speakers, not the amp). I want to run somewhat heftier speakers but can I also use the effects loop out (the only out besides L&R speakers, of course there's an effects in) into a another powered head to run monitors? The signal would be low - pre-amp at most - so it has to go to an amp to get pushed. Will I blow another powered mixed if I run it in? We play amped acoustics/bass up to electrics with drums/keyboards.

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150 watts should be easily handled by four Peavey speakers in the connection you described.. If the Peavey's are 8 ohms, then your total load was 8 ohms for the series/parallel arrangement which is well within the 2 ohm drive capability of the Crate according to specs.

I question if you really mean the speakers were in series? This requires a special cable to do this. Now if you mean they were "daisy chained" like the amp went to one speaker and another cable connected that speaker to another, then you REALLY had ALL speakers in parallel electrically which would be at the 2 ohm low limit of the amp... In either case, with only 1/4 of the 150 Watts to each, the speakers should NOT have been damaged. The amp MAY have been damaged. Try each speaker individually at a REASONABLE level to test.

If you plug into the effects loop out jack,OFTEN the connection to the internal power amp is broken so you might have to arrange a special cable as a wye to go back into the power amp as well as your external amp. In any case pwere ALL interconnected amps, etc from the same power source/receptacle for system safety.

Posted on Jul 16, 2010

  • cunghm Jul 16, 2010

    Thanks. Yes, I daisy chained x 2 - left speaker out from the amp into the in jack of one speaker, then out from that speaker into the next one. Repeat for the right speaker.

    I have never run anything out of the effect loops out - I was just wondering if it was doable/advisable.

    Sadly, the head - in service for many long years - may indeed be on its last legs. I tried it with two Kustom 15" speakers (250 watt 8 ohms) and got the same mushy, crackly sound. Time to look for a powered mixer that can push house speakers like the Kustoms and has a monitor channel for the Peavys.

    Thanks again - very helpful.

  • Fred Yearian Jul 16, 2010

    I am sure your unit can be repaired as likely one side of the power amp stage has probably been partially blown or possibly the filter cap for one polarity power supply has failed (easy cheap fix). Parts cost would be nominal given the symptoms you described. FInd a good local electronics tech... even if you get another unit, keep existing as a working spare or use to drive monitors as a lot of the powered mixers have an output jack BUT do not have a power amp for that which to drive speakers.



    With your speaker arrrangement you would probably want more power than 150 Watts total as you are probably driving the amp too hard.



    I have some Kustom monitor 15 inch units... I am NOT inpressed with the crossover arrangement in them... it is simplistic and really boosts the highs sent to the tweeter while leaving the highs to also go to the woofer.



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