CB PA not loud with amp?

Did you get the radio tuned to the amp?
If so they probably really lowered the mic input and radio output to under 1watt, makes it less distorted running through the amp.

Disconnect your amp, borrow a power mic from someone, and try it that way.

 

Squelch and RF only adjust incoming radio signals...
@rabbiporkchop?

 

My advice would be to try some else's CB. The uniden is only a 50$ radio, you don't have s gain control or good mic on it.
Find a local cb shop and have them show you the difference with a better radio.

 

squelch puts a wall up that incoming signals have to jump over before you're capable of hearing them and RF gain pulls a curtain down which filters out noise but still allows you to hear distant signals

 

You all need to learn how to read his statement and the question, you all got it all wrong.



Nick, Read my post carefully, it will give you an idea of what's going on.


There are a couple issues I see with this, but not being there it is hard to determine which it is.

I assume that you got a Plye PLMRA120 amp, that's what it looks like. AND you got the speaker have.

First issue is with your wiring diagram, it is wrong.

DO not split the input to the amp, go directly from the CB to the amp with one input.

BUT don't do anything yet until I explain what's going on.

You have what appears to be an impedance mismatch on the input of the amp.

The CB is looking for an 8 ohm load and it is seeing 100 ohm load on the amp which will cause the problems you have.

The reason that the Iphone sounds good is because the iphone can driver up to an 80 ohm load without an issue, the ear buds are 40 to 70 ohms impedance depending on the manufacturer.

The mismatch is where the distortion comes from and trying to drive the high impedance load with only 4 watts of audio power further aggravates the issue.

My suggests are really not the best one I can think of not being there.

You can get a cheap preamp with a matching circuit and put that behind the CB to adjust the system for the right impedance into the amp.

You can get a matching transformer to bring down the impedance n the radio side or in other words boast the impedance up.

There are a couple tricks that can be used with resistors and chokes to do this but that's complicated.

Those are all things I can't help explain and don't think they would help out right away, they don't make an 8 to 100 ohm matching transformer that I could find doing a quick search and a pre-amp you really have to search for one that works like that.

SO here is another go to a good mobile audio shop and see what they have for a solution, because your issues are all on the input side of the amp, no where else.

Hope that helps you out.

 

I wasn't talking about the CB power, you can use any source because both of them are tied to the same system within the vehicle. I am talking about you splitting the output of the PA jack on the CB to the input of the amp as it is illustrated on your diagram, if it is accurate, that is a problem because you have split between channels and then use on channel on the output to the speaker. use just one input and one output.