i started with the PBR 300x4. It was ok, but it was not as flexible as the 300x2 in setup. The 300x4 has only a fixed high pass setting of 80Hz or a fixed low pass setting of 120Hz. The 300x2 has adjustable high and low pass settings.
Once I added saddlebag lid speakers, I sold my 300x4 and bought two 300x2's. You can hear a difference between the 300x4 and 300x2, but it is subtle and at speed most will not know the difference.
There were many that had issues with the reliability of the 300x4. I had no problems with mine, but I made sure that I set the gains properly and didn't drive the amp hard for long periods of time.
If you do plan on running more than 2 pairs of speakers, then I don't recommend the 300x4 mainly because it is not stable running at 2 ohms. But if you plan to run 1 or 2 pairs of speakers and you are getting a good price, then it is worth considering. If you are getting it used, then I would make sure that you can return or get your money back if it doesn't work.
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2009 - FLTR - SE 110, RC Componets slip-ons, Alpine/Polk/HAT/RF audio, RC Component Imperial Wheels 21/17 combo, 12” DNA Monster bars, TopShop rear fender and bags, More to come... JuicedHD...