megamond Posted December 25, 2016 Share Posted December 25, 2016 7 hours ago, davewantsmoore said: These type of enclosures are incredibly difficult to design well IMHO. Yes, the Nexo/Speakerplans 6th order BP design doesn't seem to change much, I assume pros have time and materials to tinker to get it just right and AFAIK if you get it wrong, you DO get HF products distortion (c/- subwoofer builder) Red Spade Audio has post on the subject re the 6th order BP being hard to locate sonically in a room due to this low distortion. I still maintain that it's the pure Helmholtz cavity resonance in both cases eliminating the driver/room direct interface that's at issue - the driver is not merely 'slapping' the room air, there is a transition of solid/gas sound medium as in a TL or horn loaded woofer. Link to comment Share on other sites More sharing options...
almikel Posted December 28, 2016 Share Posted December 28, 2016 On 12/25/2016 at 3:01 PM, megamond said: I still maintain that it's the pure Helmholtz cavity resonance in both cases eliminating the driver/room direct interface that's at issue - the driver is not merely 'slapping' the room air, there is a transition of solid/gas sound medium as in a TL or horn loaded woofer. Hi MM, you may be correct, but in a 6th order design it adds to the complexity of the design to ensure the air velocity is low enough to avoid chuffing/port noise through any ports. IME, any sub (or subs) designed with low distortion will produce similar results "in the room" with good integration. The "type" of sub matters less. YMMV. cheers Mike Link to comment Share on other sites More sharing options...
Silent Screamer Posted January 6, 2017 Share Posted January 6, 2017 Had too many failures with subs, upcoming sub will be one 18" pro driver with two 18" passive radiators. Link to comment Share on other sites More sharing options...
davewantsmoore Posted January 6, 2017 Share Posted January 6, 2017 Unless you need insane SPL, then I would just use an 18" driver and EQ.... Unless you need the extra output capability of a vented system (or a PR), then it will just reduce the performance in 90% of cases. 1 Link to comment Share on other sites More sharing options...
megamond Posted January 14, 2017 Share Posted January 14, 2017 On 28/12/2016 at 4:37 PM, almikel said: IME, any sub (or subs) designed with low distortion will produce similar results "in the room" with good integration. Understandable, given the (fundamental of many instruments') frequencies involved, but it's probably a matter of whether one has 'cloth ears' - it may only essentially be 'rumble', but the distortion is in the audible, not tactile, frequencies above this. That said, I should listen to a few more TL/horns as a comparison. Link to comment Share on other sites More sharing options...
megamond Posted January 14, 2017 Share Posted January 14, 2017 On 06/01/2017 at 11:10 AM, Silent Screamer said: upcoming sub will be one 18" pro driver with two 18" passive radiators. Something to be reckoned with, and again reportedly very low distortion. Link to comment Share on other sites More sharing options...
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