I bought some drive-in movie speakers which I restored by cleaning up and replacing the old 4" drivers.The two drivers are 4" in size, 4 Ω and 5 W (dee pictures).
I bought a mini Bluetooth amplifier to hook up these two speakers so that I could play '50s tunes from my phone via Bluetooth cast out in mono.
It worked great for the short test runs I did but yesterday I lost all output from the mini amp (see picture of mini amp) which had an output of 50 W per speaker. I put both speakers onto just one output on the amp so it would be 10 W on that output leg.
The amp company through a very broken English email is telling me that the speakers are not large enough and it backed up the amp and overheated it. That may be true, but the amp was only on for less than 15 minutes and it was not hot when I went to see what was up with it.
The only advice from the amp company (they say they won't warrantee my purchase) is to buy another amp but hook bigger speakers up to it. I can't do that due to the nature of what I am trying to do with the drive-in speakers.
My question here is: Is there a way to put some kind of circuit/resistor in this mix somewhere that could fool the amp into thinking there are larger speakers and thus dissipating any output power that might otherwise back up and blow out the amp?
Please note with this request that I know NOTHING about wiring and circuitry so your answer would have to be very specific of what I should buy and where to place it in the mix (a drawing would be helpful). If any of you with a more technical side would wish to help me I would be so appreciative. I was supposed to show off this system at the end of the month at a drive-in which no longer uses real speakers. I was going to Bluetooth the radio broadcast of the movie onto my speakers.