Installing a PA System in a Training Car

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Discussion Overview

The discussion revolves around the feasibility of installing a PA system in a training car, focusing on the components needed, specifically the amplifier and microphone setup. Participants explore various options for amplifiers and the legality of using such systems in different contexts.

Discussion Character

  • Exploratory
  • Technical explanation
  • Debate/contested

Main Points Raised

  • One participant suggests a simple setup of mic, car amplifier, and speaker, questioning if any mono car amplifier can be used.
  • Another participant indicates that a pre-amp is necessary to bring the mic output to line level for the amplifier and critiques the suggested amplifier as unsuitable, recommending a full-range amp instead.
  • There is a mention of CB radios having built-in PA functions as a potentially cheaper alternative for the setup.
  • One participant notes that old CB radios typically output 30-40W, which may not meet the power requirements of 150-200W for the intended use.
  • Another participant argues that 30-40W would be sufficient for a horn speaker, citing the efficiency of horn speakers and comparing them to bullhorns that operate at lower wattages.
  • A later reply challenges the power output of CB radios in PA mode, suggesting that it is likely much lower than previously stated.

Areas of Agreement / Disagreement

Participants express differing views on the power output capabilities of CB radios and the adequacy of lower wattage for the intended application. There is no consensus on the best amplifier choice or the legality of using PA systems in various contexts.

Contextual Notes

Participants mention legal considerations regarding the use of PA systems on public roads, but clarify that the intended use is on a closed driving course. There are also unresolved questions about the specific power requirements and the efficiency of different speaker types.

marinpa
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Hello,

Can someone tell me if my idea is workable or not.
I need to install a PA system in one of my training cars. Just the PA. No sirens, horns or whistles.

My idea is to use a simple setup: mic- car amplifier - speaker (100W)

The question is, can any mono car amplifier be used for this project?

I am thinking of this one in particular
http://www.fixya.com/recommendations/p75473-jbl_bp150_1_car_audio_amplifier
 
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You can use a car amplifier, but you would need a pre-amp to bring your mic output to line level for the amplifier to use. Also, the Amp you have in your link won't work at all, its a subwoofer amp, you need a full range amp. If you look at a few CB radios, most of them have a PA function built in, it would probably be cheaper. Also, in case you didn't know in most places its illegal to use a PA system on the street.
 
famousken said:
You can use a car amplifier, but you would need a pre-amp to bring your mic output to line level for the amplifier to use. Also, the Amp you have in your link won't work at all, its a subwoofer amp, you need a full range amp. If you look at a few CB radios, most of them have a PA function built in, it would probably be cheaper. Also, in case you didn't know in most places its illegal to use a PA system on the street.


Thank you for your answer. I will keep in mind your advice.
As for the the PA system, is not to be used on public road but closed driving course.
 
Old CB radios often had a PA output, I bet you could buy one on eBay for next to nothing, the speaker output is 8 ohms so you can go right to a PA speaker
 
fizz_it said:
Old CB radios often had a PA output, I bet you could buy one on eBay for next to nothing, the speaker output is 8 ohms so you can go right to a PA speaker

The CBs don't put out more than 30-40W to the speaker. We need 150-200W
 
marinpa said:
The CBs don't put out more than 30-40W to the speaker. We need 150-200W
Not with a horn speaker. Horns are amazingly efficent, trust me 30-40W will be plenty. Just for reference, one of those bullhorns they use in sports etc. are only around 10-15 watts and they will make you go def.
 
I SERIOUSLY doubt any CB ever put out more than 3 to 4 watts on PA mode. 30 to 40 is unlikely.
 

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