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Old 04-24-2016, 10:20 AM
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Recommendations on PA Horn for CB

Looking for Recommendations for a PA horn for a CB ( Cobra 29LX )

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Old 04-25-2016, 11:57 AM   #2
Knows a couple things...

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The key is to get a PA speaker whose power/wattage requirements match your CB's PA output jack's power output ability. So if you plug in a 100 watt cop car PA speaker into your Cobra's PA jack, you'd be lucky to hear anything at all since that Jack is lucky to put out 3-4 watts. Get a PA speaker designed to work with low power and you'll have the most volume out of it. Go for a PA speaker made for CBs like from Cobra, Uniden, Midland, or perhaps an MFJ communications speaker like ham shops carry. They're designed to put out decent volume with not much power. Don't expect too much though, they're not going to be a useful as a serious PA... there's just not enough wattage available from the CB's PA speaker jack for that.

I plugged a PA speaker into my CB years ago that was a good match power-wise for it but the volume available was still pretty much a joke so I ended up removing it. There's not much need for a PA on a Jeep anyway.

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Old 04-28-2016, 11:50 PM   #3
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I put a flat style speaker rated for 300 watts behind the grill.

It was nowhere near loud enough and also had significant distortion on the low end of the voice frequencies.

I put a really cheap subwoofer mono amp between the cb and the speaker and also put a RCA high pass filters at 150hz on the input to the amp.

Now it works really well. It's "loud loud", but it isn't "cop car loud". Since I use it to communicate with people on trails it does not need to be that loud.

My parts list is in my garage profile.
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