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let me make sure how you installed the amp. You taped the speaker level signal from the wires running from oem amp speaker output to subs. Since your alpine mrp-m500 provides with speaker level input therefor you don't need hi-low adpater. If all that are correct, then
1. did you cut down the oem speaker wires where you taped the signal from for your mrp? These speaker wires should be connected to your mrp amp output.
----------- ----- pos.1 --------- -----------
| oem amp | -- speaker wires --> | mrp amp | -- speaker wires --> speakers
----------- --------------------- -----------
2. If your installation was correct as described above, disconnect the speaker wires of pos.1 to test whether you still have the noise. If you still have the noise then your mrp amp is bad.
good luck
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