Join Date: Apr 2011
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Amps rated at 4ohms per channel are stable and will operate with 2ohm speakers with no problem. As a rule of thumb cutting the ohms in half will double the power output, so make sure the speakers in question are designed to handle that much power.
There is an option with most amps to bridge two of the channels with one speaker (connect the positive wire from the speaker to the possitive terminal of one channel, and the negative wire from the same speaker to the negative terminal of the second channel, hence the "bridge"). This however will drop the rated impedence of the speaker by half as well. Thus if you have a 2ohm speaker and you bridge 2 channels, the amp will be seeing 1ohm of connected impedence. There are very few (and quite expensive amps) that are rated to function under those conditions.
So the long story short is, the amp you have will work fine, but only connect each speaker to their own channel and leave the other two channels of the amp alone. Your other option is to get new speakers rated at 4ohms and bridge one across channels 1&2 and bridge the other across channels 3&4.
According to the manual for the rockford PBR amplifier page 7 4 OHM STEREO LOADS ONLY. if you have the boosted rail technology amp it will overheat and shut down at two ohm.
also this amp is not bridgeable.
great amp but limited cofigurations
Rockford Fosgate® - RFTECH Support