I can't understand the song and dance your audio dealers were making,
either, unless they thought it was entertaining enough for you to want to
pay for it..
I have had new radios installed in the presence of a hidden amp (sound going
to four speakers). When previously the output was too low the new radio was
connected to the amp.
More recently this was not necessary because the radio's amp was more
powerful than before, so I asked the dealer to bypass the amp and disconnect
it from the battery (my old set-up left the system working with the ignition
off at my request).
Installation costs were not particularly high.
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