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I have a problem with my crate pa system. When I hook up everything and use my microphone the speaker distorts the sound and it is not a clean sound. I bought this system used and never hooked them up until now.

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Hiya, check that there is not a problem with the mic by using another mic/cd source first and also if you have another speaker then try that, even a small one at low volume. Just establish that the fault is with the amp (or elsewhere first) for definite. If it is the amp, then it could be as simple as loose wires/dry joints, but there is a possibility that a couple of the outputs may be gone also. Distortion is unfortunately a problem that could lie anywhere in the amp and if it is the amp, you will need to find someone in area that can repair. Best of luck

Posted on Jul 22, 2009


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I want to hook a mic into my police charger PA speaker but I don't know how to hook it up the speaker only has power and ground wire. It works but how do I hook in a mic to it and use it as a PA.

well a little knowledge of how amps and speakers work is required here ,

1st most speakers ive seen have two terminals on them one marked positive with a + symbol and one negative with a - symbol also most speakers have what is called an Impedance , this is measured in a form called 'OHMS" also most speakers today have an Impedance of 8 ohms but other impedances can be found in special equip too. hence if the speaker has an imp. of 8 ohms then its going to take something that is capable of delivering a current to it in the form of a wave form (sound) that sort of has same flow as a wave on a pond , this the speaker converts from electric to mechanical movement that moves air and then we hear it as sound . (this is way over simplification of this but hey ive only got so much room here )!!
2nd now microphones do the exact opposite of this by converting mechanical movement to electric current , but there needs to be a third part there in this device , one you've failed to mention , and that's the amplifier !! this part is very important and the system cant work without it , this device takes in the low level electric current from the microphone and AMPLIFYS it well it increases the current it does so that the speaker has the POWER to move , amps are rated in WATTS as to how much power they can add to signal the more watts it has the louder the speaker !!!

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sounds like an internal connection problem. open access panel and check the solder connection is not broken or loose. Be sure the metal mesh jacket is not touching the lead wire as that would cause a scratchy noise and feedback, or maybe near the internal cable causing feedback

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1 Answer

My pa system recieves signal but wont send any sound out

Check cables to speakers from amp if any. Possible crossover or channel failure.

Apr 08, 2014 | Audio Players & Recorders

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I have a Crate CR212 it started to hum/buzz today. It would not play out any sounds other than the noise. I unplugged everything and still it hummed. I unplugged the unit, check the fuse and replugged and...

Are all the tubes lighting up? they should glow like dim light bulbs. If not, replace them with the same model type (12ax7, or EL34 for example).

Often there are two fuses, one to protect the speaker and another to protect everything, it sounds like the latter fuse may be burned out. take it out and take it to radio Shack for exact replacement.

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I just bought a receiver, Turntable, and bookshelf speakers. Everything got hooked up but I have serious distortion coming from the speakers. Did I hook it up wrong? What could cause this and how should I...

Distortion using which source(s)? Keep in mind a turntable is basically a microphone for room-born vibrations and loud sounds so it may create feedback. And a TT without an onboard Phono preamp will require connect to one in your electronics. It will be labeled explicitly "PHONO" and only a TT should use it.

Fill in all the make and model details and how you have it connected.

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1 Answer

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 -...

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.

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I am getting some humming from the speakers when I

Yes, use balanced cable to the PA system and use a DI at the computer end.

The DI is known as a "direct box" or "direct input" and converts the UNBALANCED computer output to balanced to send toe the PA system.

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The problem is with the amplifier itself. Crackling is usually capacitor related and you will need to have the amp checked over to properly identify the cause.

Some amps are also prone to pick up static from other electrical items which can also cause these problems. I had a crackling issue with an old Crate amp of mine which turned out it was due to being too near a computer/monitor so it is worth eliminating these things as a possible cause before having the amp checked.

Hope this helps. Thanks for using FixYa.

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The 2 speaker jacks are wired in parallel. If your subs are 4 ohm rated the amp is seeing a 2 ohm load and may be trying to protect itself - hence the red light. I would suggest you unplug 1 of the subs and see if the problem goes away. You may have a problem with one of your subs. This amp is probably not the best choice for such demanding work as it is not fan cooled. Good luck.

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