I've got a ppi 900.4 on a pair of rev 8's and they scream... They are so loud that we were asked to turn them down the last time at the lake... A guy came over on a jetski that was having a family gathering on their dock (radio playing, cooking out) the lake is about 250-300 yrds long on this stretch between turns, he stated they couldn't hear anything over my revs until we made a turn around the bend in the lake... And even then they could still hear them... I tuned them with a dd1 and they are clear, clean and loud.
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