Mixer or multiple speakers

[Dewey]

I still needed to use the isolators.

Thanks again, that's enough for me to make a decision. Now, I just need to search for the cheapest ground loop isolator that I can find that physically keeps the input grounds isolated from each other. This way, I'm still hoping that a single stereo isolator with one scanner into the left and one scanner into the right will do the job.

 

[ofd8001]

I find it most helpful to use multiple speakers, each in a different location. That way, where the sound is coming from helps me to differentiate who is transmitting and how much attention to pay.

 

[mass-man]

I've used these guys in the past, but most of their stuff is 24volts, if you wanted to deal with that:

Mixing - RDL®

Microphone-level and line-level audio mixers and passive audio divider / combiner products

rdlnet.com

I can't begin to count the RDL products that are throughout the TV station where I work. Many of the stick up series!!!

 

[RFI-EMI-GUY]

I have been looking at this specific mixer for installation in my truck so I can have audio from 4 sources, has balanced inputs and a pan function so that I can place certain receiver's audio spatially in the cabin. On the output two powered Motorola speakers.

Rolls MX124 ProMix IV Four Channel Stereo Microphone Mixer | eBay

Find many great new & used options and get the best deals for Rolls MX124 ProMix IV Four Channel Stereo Microphone Mixer at the best online prices at eBay! Free shipping for many products!

www.ebay.com

 

[RFI-EMI-GUY]

this one as well.

Rolls MX401 4-channel XLR Mic/Line Stereo Mixer | eBay

Rolls’ Potent, Portable XLR Mixer The Rolls MX401 4-channel XLR Mic/Line Mixer is an elegant, compact XLR mixer with robust tools for live and studio mixing. The MX401’s prime advantage is its wide-ranging independent controls for each channel. Each of the four XLR inputs offers individual...

www.ebay.com

 

[RFI-EMI-GUY]

Thanks again, that's enough for me to make a decision. Now, I just need to search for the cheapest ground loop isolator that I can find that physically keeps the input grounds isolated from each other. This way, I'm still hoping that a single stereo isolator with one scanner into the left and one scanner into the right will do the job.

Cheapest is not best. The ones you want will have a large physical transformer inside. Usually two transformers because they are for stereos, so you get the bonus of two radios. The cheap ones either have tiny transformers designed for very low levels of AC and DC or simply have a pair of capacitors blocking low frequency response.

 

[Ubbe]

That MX124 doesn't use galvanic transformers on its inputs, so might not be as effective to prevent groundloop issues. That C107 high pass filter are liniar, it will have an impact on 500Hz and gradually attenuate the lower it goes in frequency but will have most effect when both pan and volume are in their middle position. If either or both controls are at their end the filter effect will be almost non existing. It has a low production cost and low performance by only using transformers at its output.



/Ubbe