natemikegray Posted June 21, 2016 Author Report Posted June 21, 2016 I'm thinking that may be wrong but im not sure 2001 Tahoe No system. Not even aftermarket headunit.
Joe X Posted June 21, 2016 Report Posted June 21, 2016 The official Xmax for the RE SEXv2 12 is 20 mm but 1.1 inches is about 28 mm so I wouldn't be sure the parameters belong to your sub.
natemikegray Posted June 21, 2016 Author Report Posted June 21, 2016 I was thinking the same thing. So I'm going to try and get those spread sheets from the one guy and I'll let you know. 2001 Tahoe No system. Not even aftermarket headunit.
natemikegray Posted June 21, 2016 Author Report Posted June 21, 2016 The official Xmax for the RE SEXv2 12 is 20 mm but 1.1 inches is about 28 mm so I wouldn't be sure the parameters belong to your sub. The guy that gave me those parameters said that the website was underrating it and that 1.1 inches is the Xmas. 2001 Tahoe No system. Not even aftermarket headunit.
Joe X Posted June 21, 2016 Report Posted June 21, 2016 Let's say those params are good, here's how the theoretical in-car response looks: -Red is a 4th BP 1 cf sealed 2 cf ported @47Hz -Yellow is a 2cf ported@34Hz
Joe X Posted June 21, 2016 Report Posted June 21, 2016 .. and here are the cone displacement and vent airspeed for that rule of thumb designed bandpass: Airspeed for 40 square inches of port area: So that's where the rule of thumb method leaves us but there's room for improvement which you will miss if you don't go by better methods.
natemikegray Posted June 21, 2016 Author Report Posted June 21, 2016 .. and here are the cone displacement and vent airspeed for that rule of thumb designed bandpass: Airspeed for 40 square inches of port area: So that's where the rule of thumb method leaves us but there's room for improvement which you will miss if you don't go by better methods. What would you suggest then. I think I understand those diagrams but then again Im not sure. I really want to do this right but my air space is limited to a total 6.48cuft. And I can't thank you enough for helping me out. 2001 Tahoe No system. Not even aftermarket headunit.
Joe X Posted June 21, 2016 Report Posted June 21, 2016 Ok just bear in mind the first plot: 4th order BP vs Ported (frequency response), did you try a ported box and the box failed your expectations?
natemikegray Posted June 22, 2016 Author Report Posted June 22, 2016 No it didn't. I have a ported box in my trunk tuned to 35 hz. Not saying that I couldn't build another one, I just wanted to try the 4th Order for the supposedly increased efficiency and SPL. 2001 Tahoe No system. Not even aftermarket headunit.
Triticum Agricolam Posted June 22, 2016 Report Posted June 22, 2016 No it didn't. I have a ported box in my trunk tuned to 35 hz. Not saying that I couldn't build another one, I just wanted to try the 4th Order for the supposedly increased efficiency and SPL. Bandpass boxes let you trade efficiency for bandwidth. While you may be able to get more efficiency with a bandpass box than your current ported box, you are going to pay the price in bandwidth, and the box will have to be much larger than your current ported box. In car audio everything is a tradeoff. "Nothing prevents people from knowing the truth more than the belief they already know it.""Making bass is easy, making music is the hard part."Builds:
Recommended Posts
Archived
This topic is now archived and is closed to further replies.