Keep in mind if you get 2 woofers that are d4 you'll end up wiring to 1ohm and need a diff ampoh yea get D4, its how you wire the sub to your amp. since the ppi does most power at 2ohms youll want a D4 to wire down to 2 ohms at the amp
mine have been awesome so far. all tho im on the phantom series. i have the ppi p600.2 and p1000.1Pp amps worth a ***?
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