Multiple radios to one speaker
Moderator: Queue Moderator
- Elroy Jetson
- Posts: 1158
- Joined: Mon Sep 03, 2001 4:00 pm
You can't do that safely without special
electronics.
By the way, in case you hadn't thought about it, communications speaker usually work
just fine under the seats of the car. Or
they can be tucked up under the dash in many
cases. Be creative. You'll figure out a
way to use a separate speaker for each radio.
Elroy
electronics.
By the way, in case you hadn't thought about it, communications speaker usually work
just fine under the seats of the car. Or
they can be tucked up under the dash in many
cases. Be creative. You'll figure out a
way to use a separate speaker for each radio.
Elroy
My speakers are between the door and the seat in the car - there seems to be enough room. I have found this allows for the audio to go up towards the celing, and get reflected better throughout the car.
Just an idea. You can buy smaller speakers too, you don't need to use the larger motorola ones, but the audio quality is quite nice from the Motorola ones.
-Alex
Just an idea. You can buy smaller speakers too, you don't need to use the larger motorola ones, but the audio quality is quite nice from the Motorola ones.
-Alex
That's an easy one. Go to Radio Shack and get an audio transformer with 8ohm/1000 ohm windings. One trans. for each radio.
The one radio's output goes to the 8 ohm side of trans. #1
The second radio's output goes to the 8 ohm side of trans #2
Both of the transformer's 1000 ohm windings tie in parallel and go to the single speaker.
I use this frequently and it works just fine.
The one radio's output goes to the 8 ohm side of trans. #1
The second radio's output goes to the 8 ohm side of trans #2
Both of the transformer's 1000 ohm windings tie in parallel and go to the single speaker.
I use this frequently and it works just fine.
-
- Batboard $upporter
- Posts: 2884
- Joined: Mon Sep 03, 2001 4:00 pm
-
- Posts: 259
- Joined: Fri Sep 14, 2001 4:00 pm
You can load the speaker output with the right value resistor of 16 ohms at five watts. That will make the push-pull output of the audio amp happy. Then tap off with a 1000 ohm resistor to a mixer input set to line level input. The other side on the input to the mixer will be at ground level.
this will isolate the speaker output and pad it down a bit. The mixer to use is up to what you can find. The output of the mixer is then connected to a single audio amp and matching speaker. You then adjust each input on the audio amp for the radios you have.
You can use a switch box instead of a mixer to feed the one audio amp/speaker.
DO NOT SHORT OUT THE RADIO AUDIO OUTPUT. Pulling the audio amp in a Spectra is a :o.
Mike
this will isolate the speaker output and pad it down a bit. The mixer to use is up to what you can find. The output of the mixer is then connected to a single audio amp and matching speaker. You then adjust each input on the audio amp for the radios you have.
You can use a switch box instead of a mixer to feed the one audio amp/speaker.
DO NOT SHORT OUT THE RADIO AUDIO OUTPUT. Pulling the audio amp in a Spectra is a :o.
Mike
Using any type of a switchbox makes no sense at all- that will allow only one radio to work at a time. The idea of 1 speaker/2 radios is to use 1 speaker on 2 radios SIMULTANEOUSLY, not one at a time.
And no, the transformer offers no distortion. You will, however, notice a very slight lowerin of the volume which you compensate by turning it up louder. This isn't a problem unless you're in a REALLY noisy environment. I just did this circuit again Monday and it works just fine.
And no, the transformer offers no distortion. You will, however, notice a very slight lowerin of the volume which you compensate by turning it up louder. This isn't a problem unless you're in a REALLY noisy environment. I just did this circuit again Monday and it works just fine.
If your Radio Shack has them, try one of their "Universal Speakers". They come in 5x7 or 4x10 sizes. What makes this work is that they have 2 seperate 8 ohm coils so they can be connected to 4 , 8, or 16 ohm outputs depending on how you hook up the jumpers. I have hooked 2 radios to them without any problems.