Well my buddy gave me a pa speaker for my birthday on Friday, and I can't seem to get the squeal out of it with out turning the dyna mike almost down to nothing. I've mounted it to the driver side fire wall, ran the wire through the fire wall up the A post across header liner trim to my roof mount Cobra 29 LTD Classic. The <a href="http://www.motorhaven.com/"><a href="http://www.motorhaven.com/"><a href="http://www.motorhaven.com/">head liner</a></a></a> trim on that side also shares the <a href="http://www.motorhaven.com/"><a href="http://www.motorhaven.com/"><a href="http://www.motorhaven.com/">antenna</a></a></a> co-axe for a Wilson Little Will mag mount. The power line is run on the opposite side.

When I crank up the dyna mike past the 2nd bar it squeals when I talk. If I bring it down to about a bar and a half it's clear but not as loud as I'd like it to be. There's no markings on the speaker to tell what brand it is, but it's about 8 inches long and 5 inches around at the end of the horn. It's not light, it has a good weight to it so I don't think it's a cheepy.( My buddy only buy's quality gear) My radio has a conax board and has been tuned and peeked. Could it just be too much feed from the radio? Too light a wire gage? Wire routing? Fire wall mount too close to radio?

I'm running an Astatic power mike but I had it turned right down.

Any thoughts on this folks I need it to be much louder so I can poke fun at bass boom ricers and nuns at cross walks

 

Unless it's the impedance of the speaker,I would say the problem is the MIC.

Go ahead move it.
Make a copy for electrical forum too.

 

This may seem like a *stupid* question, but which direction is the horn/speaker facing? It sounds like a feedback problem from your mic to me. Since you have a high quality Cobra 29LTD =), i imagine you have a mic with better sensitivity. I think your mic may be too sensitive, and therefore is producing a feedback loop.
You could try moving the speaker again, you could purchase a less sensitive mic, or you could take yours apart and lay some kind of damping over the mic to reduce your chances of feedback entering it. ( this would also however reduce the input level of your voice. Worth a shot though!

 

We used to run Cobra 29's clipped with Astatic D104M6B mikes set on about 7 and the Dynamike control on the radio at between 1-2:30 o'clock position. Your receive volume control on the radio controls the output volume of your PA,try the above settings on your radio and mike and adjust your volume control for the PA and see if that helps.

 

I have a 2970 galaxy 100amp built on linear mounted in my 1992 bronco. With the window rolled down(PA ON) i get a squeal, this radio at14.4 volts pushes 95 watts. My first sugg. is try moving it further away from the radio (mic). If this doesnt solve your problem let me know the model # of your mic and i can send u a schematic and tell you what size capacitor and resistor to put across the audio and shield wire .this, squeal is usually cause by rf feedback( comes with a power mic )simple terms some of your transmitting energy is getting back into your audio section of the cb--------------TR

 

Well it's 8 am (mental note to self, don't work on pa speaker before the rest of the family is up on Saturday morning)

I've got it working great now! I moved it to the front passenger side just behind the grill pointing down.

It's real loud, I tried it out and woke up just about every bird for a mile ( it was like a Hitchcock movie). My wife even got out of bed and came out just to call me names. And what do I do? I reply over the pa with a simple "good morning to you too honey"

Some how I don't think this will be one of her favourite toy's.

Lucky my nearest neighbour is over a mile away with lots of trees between us!

Thx for the input guy's