2. Either one will work. You just don't want to over power the sub if you get the 2 ohm DVC model.
Alpine states the SWR-1223D to be 600 watts. I hope that is 300 watts each coil. My reason for not spending extra money on XLS-2000 or XLS-2500 is that I think I can get more power from XLS-1000 if I power the voice coils individually. Coz this amp can do 550 wpc at 2 ohms in stereo mode if I run both the channels without bridging. OK let's not be over optimistic and assume XLS-1000 does 330 wpc at 2ohms (60% power at full frequency spectrum) and I power each voice coil individually, I still get 660 watts collectively. Alternatively, I can wire the sub in series (4 ohms) and run crown in bridged mode i.e. 1100 watts at 4 ohms (1 khz), which still equates to 660 watts at 4 ohms (60% power at full frequency spectrum). So, the only difference is the choice between running the sub at 2 ohms or 4 ohms. Is there any sonic benefit I get by running it at 2 ohms compared to 4??? If not, shall I stick with wiring the sub in series and run it off crown in bridged mode?? It will save me from cutting two holes to accomodate two sets of binding posts. Another very important question, shall I go sealed or ported?? I eventually want to get rid of Klipsch SUB-12, and add another DIY after this. Can I still achieve depth in sealed box i.e. close to 20 hz?? Can I get away with not using SSF if I go with ported design i.e. I tune the port below the lowest LFE in most movies?