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Splitting a signal 40 ways
Old 4 weeks ago
  #1
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ELI-173's Avatar
 

Splitting a signal 40 ways

Hey guys,

A friend is doing an installation of vintage boomboxes (35-40 of them) and we're looking for the best way to split a single stereo signal and output it to the rca line inputs of all of the boomboxes at once.

So basically:
iPod or DJ mixer (most likely the balanced outs of a DJ mixer) --->40 boomboxes via RCA inputs.

Any advice would be greatly appreciated!
Old 4 weeks ago
  #2
Gear Addict
 
Murky Waters's Avatar
 

5 x RDL ru-ada8d

or

4 x Kramer VM-1610
Old 4 weeks ago
  #3
Lives for gear
Or one reasonably clean 10w hi fit amp, and a 10k buildout resistor for each boom box.

Make sure you have some iso transformers... either audio, or AC. Neither my solution nor the pro DAs will protect you from ground loops. But you won’t know which boxes need iso until you hook it up.
Old 4 weeks ago
  #4
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ELI-173's Avatar
 

Thanks so much for the help on this, guys. It's much appreciated! I think the RDLs look like a good choice. This needs to be assembled in a couple of weeks or so.
Old 4 weeks ago
  #5

It might be easier to use an FM transmitter....



-tINY

Old 4 weeks ago
  #6
Gear Addict
Assuming a worst case 10k input impedance per boombox (47-50k more likely, but just in case), 4 groups of 10 driven in parallel would be 1k per group, which an NE5532 or LM4562 would drive just fine, plus another one for bal to unbal, so 5 opamps and a few resistors and caps in a small proto board plus a PSU, which could be a wall wart (say 12V) to keep things cheap and simple.

On the other hand,
Quote:
Originally Posted by tINY View Post
It might be easier to use an FM transmitter....
This is a great idea, no cables so cleaner looking and more flexibility placing the boomboxes.

Edit: also, can you tell us more about the installation? 40 boomboxes, sounds like fun!
Old 4 weeks ago
  #7
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nucelar's Avatar
 

FM transmitter is the best solution, provided the boom boxes have a radio, but you may run into legal issues.

https://www.amazon.com/Retekess-Tran...dp/B01D44EP4K/
Old 4 weeks ago
  #8
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why not use a few splitters? are the boom boxes very far apart? - can recommend the xta.
Old 4 weeks ago
  #9
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emrr's Avatar
Rent or buy a press mult.
Old 3 weeks ago
  #10
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brianroth's Avatar
 

A FM radio TX was the best idea I saw in this thread. Wireless!

Bri
Old 3 weeks ago
  #11
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ELI-173's Avatar
 

We’ve purchased the transmitter recommended above and so far it’s working really well!

I want to thank everybody who contributed ideas and information here, it’s much appreciated.


P.S. will share info once the project is up a month or two from now.
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