Help with PA system

[beavis195]

Just bought a Cobra DX 19 III CB radio and a PA speaker. Hooked the PA speaker up, tried it out and all I get is tons of feedback. I put the speaker in the cargo area and tried it and still got all feedback. If I mount the speaker outside will the feedback go away? If I get a noise cancelling microphone will that solve it? I want a cheap fix before I go and buy another microphone. Thanks for the help.

 

[kilroy]

you need to get the speaker as far away from the mike as possible, and if you can turn the gain down on t as well, that will help.

 

[beavis195]

What do you mean by the gains? The squelch?

 

[kilroy]

some radios you can increase the mike output so you sound louder. Its whats called modulation. You can over modulate a CB and sound like crap, but if you get the modulation just right you can sound boomin on the other end. Power mikes like a D104 you can increase or decrease the gain on them right on the mike, while some radios do it internally. I have a Cobra 148GTL Peaked & Freaked with a mobile D104 and that baby can kick some royal butt, but with a PA speaker I have to almost turn the mike gain off to stop the feedback, and that is with the speaker as far out from the mike and the windows rolled up.

 

[Alec]

I mounted the PA speaker in the grille of the truck. It's hooked to a Cobra 19 DX II. I just put a headphone jack on the end of the speaker cable and plugged it in, no problems. I don't know if the speaker polarity has anything to do with it though.

My next project with my CB is this: I got a $14 40W amp at Radio Shack. I'm going to hook it up to be ignition controlled, and use it to amp my PA speaker.

 

[tac0meat]

Dead Link Removed

cheesy pic but it gives you an idea where i mounted my PA speakers(one on both sides) mine are also powered by a 200 watt amp, its kinda of complicated how i hooked it up but if your interested just let me know and ill do my best to explain

 

[espnfreak]

so are you going to talk to people

 

[beavis195]

Good news, it works now, but I got the cable caught either in the fan shroud or in on the steering because when I turned, the cable snapped. Tacomeat, how did you attach yours, and did you have to drill holes? Thanks.