how to split the audio signal to multiple chip amps?

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wrybread

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Joined 2018
#1
I'm building out the sound system in an RV, and using multiple Breeze Audio amps:

TPA3116 HIFI Class 2.0 Stereo Audio Digital Amplifier Advanced 2X50W Breeze Amp | eBay

They work beautifully individually, but I'd like to split the audio from the master input so it sends an audio signal to each of the two other amps, so I can have individually controllable sound simultaneously in other areas of the RV. Using a passive audio splitter such as this hasn't worked well:

Amazon.com: LP Headphone Splitter,3.5mm Headphone Earphone Audio Splitter 1 Male to 2 3 4 5 Female Cable (Green): Kitchen & Dining

There's a predictable drop in signal strength with each new line plugged into it.

Does anyone know of a good way to handle this, ideally in a compact way?

I was thinking about taking a Boosteroo and hard wiring it's power, which is an active headphone splitter, but haven't had any experience with it.

Amazon.com: Upbeat Audio T613-BNC Boostaroo for All Audio Application: Home Audio & Theater

Or maybe this guy:

Amazon.com: MT-VIKI 4 Port 1 In 4 Out 3 RCA AV Audio Video Splitter Amplifier for Cable Box DVD DVR Analog TV: Electronics

Does anyone have any advice for how to achieve this?
 
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#2
I guess you are looking for a ready made solution......

The diy way to do this would be to use a simple opamp buffer circuit but you don't say whether you would be happy with diy construction.

A ready preamp suitable for the supply voltage you have available would also stand multiple loading on its output.
 
#6
> the master input

Which is what? A headphone jack and...??

Those power amps are specs-free, but it is hard to imagine that 2, 3 or 30 of them is any strain on a modern headphone jack. That headphone splitter may have "stuff" in it causing your drop. Me, I would just twist all the wires together (left, right, ground), though I understand wanting to RV and not wanting to do wiring.
 
#7
> the master input

Sorry that was vague. For simplicity call it the headphone jack of an iPhone. The behavior is the same no matter what I use (the output from a bluetooth receiver, or my Kindle, or iPad, or whatever).

> those power amps are specs-free, but it is hard to imagine that 2, 3 or 30 of them is any strain on a modern headphone jack

Me too, but there's a noticeable drop in sound level. It's tolerable with two amps connected, but once I add the third it's a serious issue. I suppose I could boost the signal with an inline amp, but I'm wondering if a powered splitter like the Boosteroo (link in my original post) would overcome that. Or that other distribution amp (also linked above).
 
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