Hopefully this is the correct StackExchange site for this sort of question, I have been pulling my hair out trying to figure this out.
I have a projector with RCA out which I have attached to a Bluetooth transmitter via an RCA to 3.5 jack, which in turn connects to a battery powered Bluetooth speaker (A Denon one if applicable). The problem is the volume, it so quiet. The projector has no volume control on the RCA out (as RCA is supposed to be plugged in to an Amp of some kind I have since learned). The Bluetooth transmitter also has no volume control on it. And if I turn the Denon up full, it is still really quiet.
Clearly I need to amplify the sound between the RCA and the Bluetooth transmitter, but I am not able to find anything takes in RCA or 3.5 plug, and then spits out either RCA or a 3.5 plug as well. All the mini amps I can find spit out left and right speaker cable to connect to speakers. Like this one on Amazon
So then I went looking for left/right speaker cable to RCA or 3.5 and couldn't find anything except high to low converters for splitting the base out for sub-woofers (in cars etc..)
I am in the UK which may be limiting my hardware choices?
The crux is, how do I amplify my RCA out, so it can still plug it in to my Bluetooth transmitter via 3.5 plug?