in all honestly, the bass vents through the old holds in the parcel shelf, its tight and sealed. If your free one weekend your more than welcome to organise a time to come and have a listen... I can't comment for BNO but if I was to add something, it would have to be that having a side firing sub setup would more likely give you a higher dB. I had experimented with various configurations and found that layout to yield better results when seeking volume. side firing is the way to go to be honest, plus, it comes down to box side and what your trying to go for. See im an sq audiophile (note all my work bar a **** load of sound deadening was done by northfield) but the big thing comes down to final tuning as well. Im about to upgrade processors from the pxa100 to the h800 which will correct a few things. ARC on here knows his stuff about sound as he used to work in the audio install industry, but in my opinion and NO PLUG to these guys eihter, ring drew at northfield and speak to him, those guys know their stuff. Tweeter location in the aurion stock is steller for a 2 way set up, i cant really fault mine at all, only thing i have to fix is a bit of fine tuning with centre chanel to the driver seat not direct centre. it was the only thing that let me down at the last measq comp. If you got any questions just pm me :) on a side note, was involved in a minor front on acco yesterday THANK GOD my vip grill hasnt been ordered yet, but i need a new bonnet, and front bar.. god damn hayfever, had a sneezing fit whilst in bumper to bumper traffic. between that and the hail dammage plus work cancelling my contract ending next month its been a **** week. but hey lol. cheers Dan