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- 230 Watts RMS x2 (4 Ohms)
- Not Stable at 2 Ohms
- Not Stable at 1 Ohm
- 460 Watts RMS Bridged (4 Ohms)
With these specs, you can't even power one Alpine Type-R properly. In my opinion, I suggest taking the Boss amplifier back, and looking into something different that can do the job better.
However, if you have the DVC 4 Ohm versions of the Alpine Type-R's, you can wire your Subwoofers in a Series/Parallel circuit to create a 4 Ohm load. This way, you can use the Bridged option on this Amplifier. Below is a link on how the connection should look:
If you purchased the DVC 2 Ohm version of the Alpine Type-R's, then im sorry to say but you are SOL. Unless you purchase an Amplifier that is 2 Ohm or 0.5 Ohm stable, I suggest just taking everything back and starting over.