So, I don't have any problem with multiple subs. The SB16 Ultra is VERY ambitious and 3 of 'em should about rattle your fillings out in anything less than
a Very Large space......
My question was aimed more at a 'do you know WHY you did that' rather than the potential benefits. If somebody just wanted LOUDED or DEEPER than you might find an easier way or for less $$$
Magnepan MG1.6qr HSU Research VTF-2 MK3 2x Parasound A23 Parasound P5 Cambridge Audio DACMagic Plus Sony PS3 x4 @3foot runs of 10ga Belden speaker wire. GRADO SR80e on-ear headphones iMac as music server (2009) Panamax 5510 w/) ISO transformer LG 65" B6 OLED display