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Pa System

Started by texastrucker , Aug 31 2004 05:44 PM

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17 replies to this topic

#1 texastrucker

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Posted 31 August 2004 - 05:44 PM

I put a pa speaker in my cb radio and mounted it under the hood just so i could have somethin fun to play with goin down the road. :o)

but after i had it hooked up i noticed that it is not nearly as loud as others, such as police cars ones. And when turning the pa volume anywhere passed half way it starts making a high pitched scream... at about the loudness i want it to be, but i cant talk then... i dont understand whats goin on! Any suggestions and comments would help

Turner

:)>-

#2 bluesman17

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Posted 31 August 2004 - 09:24 PM

The only thing i can think of is some sort of interferance or maybe negative and positive crossed?

#3 Shadow_D

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Posted 01 September 2004 - 05:57 AM

What you are getting is feedback. This is a common problem with "PA" systems. The main cause is the microphone being too close to the speaker. Another problem that you might have is the "PA" is coming through the CB speaker as well as the outside speaker causing the feedback. Did you install the speaker by wiring it inside the CB or did you use the plug that should be on the back of the unit?
On the back of the unit there should be 2 plugs, one marked "PA" and one marked "EXT. SPK". If you have in the the second one do you have a "talk back" feature built into the "CB" i.e. when you talk into the microphone in CB mode, do you hear yourself?
Yet another problem could be the speaker you are using. Is it a true "Outside, weatherproof PA speaker"?
If not let me know, I will have to look but I think I have something that will work for you. I have had a problem lately trying to find stuff I know I have that I want to sell so give me a few days to look.

90 Bronco Full Size
Police Package
351W
E4OD
31" Tires
Going through a complete restore

http://fullsizebronc...ail.php?id=1650

#4 texastrucker

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Posted 01 September 2004 - 10:41 AM

It is in the PA jack, not the ext speaker, that was the first thing i checked

. But i did have it wired up to where it was only about 3 feet from the microphone.. maybe this is causing the interference :-"

, lol i shoulda known better. But it is a true outdoor Marine/Car pa speaker, waterproof and the whole works...

Turner

:)>-

#5 Shadow_D

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Posted 01 September 2004 - 11:04 AM

Ok mount it out near the front of the truck and see if that takes care of it

90 Bronco Full Size
Police Package
351W
E4OD
31" Tires
Going through a complete restore

http://fullsizebronc...ail.php?id=1650

#6 texastrucker

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Posted 01 September 2004 - 11:13 AM

will do when i get home. Thanks for the help. Ill let yall know how it goes when i get home.

Turner

:)>-

#7 Ktomek06

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Posted 01 September 2004 - 01:47 PM

PA's are sweet im going to get one on mine eventually!

1994 Eddie Bauer Bronco
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#8 texastrucker

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Posted 01 September 2004 - 01:48 PM

Ya it didnt work... still squeals!!!!!

Turner

:)>-

#9 Shadow_D

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Posted 01 September 2004 - 07:54 PM

The final in the radio may be going on the PA side. If you have a friend that will let you borrow his / hers, try it out to see if it fixes the problem. If it doesn't then you may have bad wires and or a bad speaker.

90 Bronco Full Size
Police Package
351W
E4OD
31" Tires
Going through a complete restore

http://fullsizebronc...ail.php?id=1650

#10 texastrucker

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Posted 01 September 2004 - 07:57 PM

ya thats waht im gonna try, hopefully i dont need a new 10 dollar speaker! lol :wacko:

Turner

#11 sweepersrgr8

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Posted 02 September 2004 - 04:53 PM

A lot of CB shops run a resistor from the PA to the EXT speaker on the circuit board. This is so you can have talkback with a regular speaker. If you use a PA or talkback speaker it will squeal. Open the case, and look at the board on the bottom, you may find a resistor soldered across the PA and EXT circuit, if so, simply cut it out. Problem fixed.

1989 EB Bronco
351W HO EFI
3 Speed Auto

#12 texastrucker

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Posted 02 September 2004 - 05:37 PM

okay... will do, hopefully it works... [-o<

Turner

#13 texastrucker

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Posted 02 September 2004 - 05:49 PM

Saw no such thing... dont know what to think... <_<

Turner

#14 sweepersrgr8

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Posted 04 September 2004 - 05:36 PM

This may sound stupid...but did you try turning your MIC-GAIN down?

1989 EB Bronco
351W HO EFI
3 Speed Auto

#15 texastrucker

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Posted 04 September 2004 - 06:14 PM

IVE DONE IT! it works, the wire i was using was to small and was making to much resistance, once i tried some thicker wiring its LOUD and im PROUD!! I always wanted mty truck to be as loud as the police cars, but now... i think its LOUDER. thank yall for all your help and helping me be more obnoxious! :))

Turner

#16 Shadow_D

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Posted 05 September 2004 - 10:12 AM

Glad to hear you got it working. All I can say no is be careful around the cops, they might not like it too much.

90 Bronco Full Size
Police Package
351W
E4OD
31" Tires
Going through a complete restore

http://fullsizebronc...ail.php?id=1650

#17 texastrucker

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Posted 06 September 2004 - 04:24 PM

ya i know, but half the time they cant find out where its comin from ><img src=

<' /> , but i dotn think ill be taking that chance, im keepin my cb lol. Its real fun goin to friends houses that you havent seen in a while and yellin over hte pa actin like a cop... its made some good laughs a few times :-"