I bought my amp (Alpine MRP-F550) over a month ago, but finally got it
installed only 2 weeks ago. At turn-on, I've noticed it has a LF hum
(70hz?) that slowly damps out (10-40 secs). It happens whether I turn
the key to start or accessory and is not dependent on volume. I also
found that it doesn't happen every time I turn it on, only if it's been
sitting off for a few minutes.
Has anyone experienced this or have any theories as to why it's happening?
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Any time that there is a rattling sound from the subs, that indicates that they are probably blown. How were the subs tested ok? If the resistance of the subs is still close to OK, that is good, but it doesn't necessarily indicate that they are working properly. Try using different subs at a lower volume, or turning down the gain slightly.
It sounds like the amp is at max power and is saving itself from frying.Different makers have different methods.If you want to you could call Alpine to verify it if you want but I bet they will say about the same thing.Good luck! Greg
as far as it staying on it may have been wired to your hot unstead of your remote on your radio
when it runs wide open it gets hot
how are your gains
I have an alpine and I just hooked up jl 12 w3s and it kinda j did what yours did
it played.. hit hard then no subs.. my mids and highs platyed, but until I would turn off the car and restart the radio the subs immediately came on and the subs are only connected to this aplpine mrp m 650 amp
what speakers and what ohm did they wire it too?
i think my problem was I was overloading my amp feeding it a 2 ohm load or a one ohm load and it was shutting down my subs.. protectection I suppose?
im having the same problem with my amp, I took it to best buy and they said the amp was recieving power and recieving signals from the deck and i had everything hooked up right but that in the circuit board all the connections were blown, meaning i have a blown amp, i hope this isnt your problem but it definetly sounds like it. GOODLUCK