lyons238
Member
I have a 12" fi Q that is fully loaded, except there is no extra spider option, and no high qts option. I also have a Sundown SCV-2000d, big 3, XS Power d3400, and an XS Power XP950 in the trunk for power. I figure after all losses/drops I should be getting around 1700w rms of clean power to the sub. For mide I have 2x 6.5" Sundown Neo Pro V2's and some Image Dynamics CTX65SC's for components up front. Hopefully having some dedicated mid bass drivers will work well with a bandpass enclosure, so that I can tune that to hit the low notes and roll off right into where the Neo Pro's will take over. Lastly, It is being installed in a 2013 Subaru WRX.
After some deliberation I think I have landed on a 4th order bandpass enclosure that is vented into the car cabin through the rear deck to maximize SPL, while retaining some good SQ in my car. However I have some questions before I move forward.
1. Will a 4th order bandpass enclosure that is vented through through the rear deck provide more SPL than a simple ported enclosure with the rear seats blocking? Does a 4th order bandpass enclosure provide more SPL without factoring in the loss from the rear seats? Also, will my sub with a ebp of 87 and a qts of .371 perform better in a 4th order over a normal ported enclosure?
2. What ratio should I use for this sub? I was thinking 2:1. 1.15 net cuft sealed : 2.3 net cuft ported. This is within the manufacturers recommended sealed/ported volume. With a bandpass box, are the manufacturer's recommended volume specs the way to go?
3. What should I tune it to? Also, what is the roll off amount per octave with a 4th order bandpass? Does volume, port area, etc affect this? I would like for this setup to be somewhat SQ oriented but to also maximize SPL with my given gear. I like to get low 25-30hz but also want it to be able to hit the higher notes.
4. Will a 6" aero port be effective in this application,? How much port area per cuft is recommended for a bandpass enclosure, is it the normal 12-16 sqin/cuft or is it more like 14-20 sq in/cuft? I believe a 6" aeroport has 28.26 sqin of port area, which is only about 12.3 sqin per cuft, is that enough considering its an aero port and not a slot? Or should I try and make or find a 8" aeroport? Am I calculating that correctly? Is length not considered when determining port area?
5. How do I calculate the port displacement to get the proper net volume of the ported chamber? In order to vent through the rear deck the aero port will stick out of the box. In order to calculate tuning and net volume, how would I figure out the volume of just the port that is inside the box, including the flare? Also, wouldn't that be contradicting because in order to figure out port length and tuning I need to know the amount of volume for that chamber, but I won't know that until I figure out the port area that is inside the box?
6. Will the non qts fi Q be best fit for this enclosure or is the qts option better?
7. Should I mount the sub with the basket in the ported chamber to reduce heat/coil issues? Also, would I need to reverse the wiring when mounting like this or is that only needed when your running multiple subs mounted opposite ways in the same sealed enclosure?
8. Will 1700w rms be too much? Does a 4th order bandpass reduce power handling or will it be similar to a ported enclosure?
9. Which is better for a 4th order bandpass the high qts option for the fi Q or no high qts option. My sub is the no high qts version which has a qts of .37 because I was originally planning on going ported. Will this be okay for a 4th order? What is the qts of a high qts fi q?
Any help is greatly appreciated as I want to make sure that I get this enclosure perfect for my application. Thanks!
After some deliberation I think I have landed on a 4th order bandpass enclosure that is vented into the car cabin through the rear deck to maximize SPL, while retaining some good SQ in my car. However I have some questions before I move forward.
1. Will a 4th order bandpass enclosure that is vented through through the rear deck provide more SPL than a simple ported enclosure with the rear seats blocking? Does a 4th order bandpass enclosure provide more SPL without factoring in the loss from the rear seats? Also, will my sub with a ebp of 87 and a qts of .371 perform better in a 4th order over a normal ported enclosure?
2. What ratio should I use for this sub? I was thinking 2:1. 1.15 net cuft sealed : 2.3 net cuft ported. This is within the manufacturers recommended sealed/ported volume. With a bandpass box, are the manufacturer's recommended volume specs the way to go?
3. What should I tune it to? Also, what is the roll off amount per octave with a 4th order bandpass? Does volume, port area, etc affect this? I would like for this setup to be somewhat SQ oriented but to also maximize SPL with my given gear. I like to get low 25-30hz but also want it to be able to hit the higher notes.
4. Will a 6" aero port be effective in this application,? How much port area per cuft is recommended for a bandpass enclosure, is it the normal 12-16 sqin/cuft or is it more like 14-20 sq in/cuft? I believe a 6" aeroport has 28.26 sqin of port area, which is only about 12.3 sqin per cuft, is that enough considering its an aero port and not a slot? Or should I try and make or find a 8" aeroport? Am I calculating that correctly? Is length not considered when determining port area?
5. How do I calculate the port displacement to get the proper net volume of the ported chamber? In order to vent through the rear deck the aero port will stick out of the box. In order to calculate tuning and net volume, how would I figure out the volume of just the port that is inside the box, including the flare? Also, wouldn't that be contradicting because in order to figure out port length and tuning I need to know the amount of volume for that chamber, but I won't know that until I figure out the port area that is inside the box?
6. Will the non qts fi Q be best fit for this enclosure or is the qts option better?
7. Should I mount the sub with the basket in the ported chamber to reduce heat/coil issues? Also, would I need to reverse the wiring when mounting like this or is that only needed when your running multiple subs mounted opposite ways in the same sealed enclosure?
8. Will 1700w rms be too much? Does a 4th order bandpass reduce power handling or will it be similar to a ported enclosure?
9. Which is better for a 4th order bandpass the high qts option for the fi Q or no high qts option. My sub is the no high qts version which has a qts of .37 because I was originally planning on going ported. Will this be okay for a 4th order? What is the qts of a high qts fi q?
Any help is greatly appreciated as I want to make sure that I get this enclosure perfect for my application. Thanks!
Last edited by a moderator: