trjohnst Posted May 7, 2011 Report Share Posted May 7, 2011 Ok, so I have a 5.87 ft^3 box for the trunk of my car and I just bought 2 AQ HDC3 copper 15's. The box is for 2 15's and is sealed. I am trying to get the best out of this box and make it the loudest possible. I will run 2 JL 500/1 for 1 HDC3. Im thinking that I will cover the extra hole on the box from the outside, use 1 15, and try to add some port tubes. I know nothing about how to use port tubes and how to calculate the diameter and length and where to put them. My box is 20.5" deep, 32.5" wide, and 15.5" tall. I was told somewhere in the range of adding 2 4" port tubes beside each other with length of 19", but the only place I could put these would be on the side of the box. So, I need some help on this box re-build with anyone who has ran these AQ HDC3 15's!!! Quote 1991 Accord Audioque HDC3 15" (Copper)<--Sub Audioque HDC3 15" (Copper)<--Backup Sub Crescendo BC2000D<--Amp Big 3 1/0 Knu<--Wiring Eonon 3.5" DVD<--Headunit Infinity Kappa Perfect<--Mids & Highs 2nd Stock 80Amp alt. 1991 Mustang 5.0 Too many mods (Sold) 1991 240sx SR20 Red Top Too many mods (Sold) 2004 GTO Just starting mods Link to comment Share on other sites More sharing options...
iceman1575 Posted May 7, 2011 Report Share Posted May 7, 2011 (edited) Ok, so I have a 5.87 ft^3 box for the trunk of my car and I just bought 2 AQ HDC3 copper 15's. The box is for 2 15's and is sealed. I am trying to get the best out of this box and make it the loudest possible. I will run 2 JL 500/1 for 1 HDC3. Im thinking that I will cover the extra hole on the box from the outside, use 1 15, and try to add some port tubes. I know nothing about how to use port tubes and how to calculate the diameter and length and where to put them. My box is 20.5" deep, 32.5" wide, and 15.5" tall. I was told somewhere in the range of adding 2 4" port tubes beside each other with length of 19", but the only place I could put these would be on the side of the box. So, I need some help on this box re-build with anyone who has ran these AQ HDC3 15's!!! Given dimensions = 4.77 cubes gross. As for cylindrical ports, you'll have to ask someone with more experience. Edited May 7, 2011 by iceman1575 Quote POTATO! Link to comment Share on other sites More sharing options...
bosshogg95slt Posted May 7, 2011 Report Share Posted May 7, 2011 well firstly with the dimensions u gave the box is only 4.8 f3 inside, dual 4" ports at around 19" will tune you to about 34hz and yes you could put them on the side you could also put them on the front but would require you to build out the area where the other cut out was patched up tuning is a matter of preference I like them low usually no higher than 34 but usually 30 or so these subs will play below tuning the hdc3 is a very well built sub a few factors are gonna be whats ur ride do you have the d1 or d2s and id be a bit wary of runnin 2 amps on one sub ill be bummin around a bit tomorrow any questions hit me up also excuse my puntuation lol or lack thereof im tired and its late for me ill have a bit more time tomorrow to post stuff Quote Link to comment Share on other sites More sharing options...
trjohnst Posted May 7, 2011 Author Report Share Posted May 7, 2011 You mean gross as in with the subwoofer in it? Sub has a depth of 8.875", so.... Quote 1991 Accord Audioque HDC3 15" (Copper)<--Sub Audioque HDC3 15" (Copper)<--Backup Sub Crescendo BC2000D<--Amp Big 3 1/0 Knu<--Wiring Eonon 3.5" DVD<--Headunit Infinity Kappa Perfect<--Mids & Highs 2nd Stock 80Amp alt. 1991 Mustang 5.0 Too many mods (Sold) 1991 240sx SR20 Red Top Too many mods (Sold) 2004 GTO Just starting mods Link to comment Share on other sites More sharing options...
iceman1575 Posted May 7, 2011 Report Share Posted May 7, 2011 well firstly with the dimensions u gave the box is only 4.8 f3 inside, dual 4" ports at around 19" will tune you to about 34hz and yes you could put them on the side you could also put them on the front but would require you to build out the area where the other cut out was patched up tuning is a matter of preference I like them low usually no higher than 34 but usually 30 or so these subs will play below tuning the hdc3 is a very well built sub a few factors are gonna be whats ur ride do you have the d1 or d2s and id be a bit wary of runnin 2 amps on one sub ill be bummin around a bit tomorrow any questions hit me up also excuse my puntuation lol or lack thereof im tired and its late for me ill have a bit more time tomorrow to post stuff Then why bother replying if you can't use a language we can all understand? You mean gross as in with the subwoofer in it? Sub has a depth of 8.875", so.... Gross as in before any measurements are taken out, ports, etc. Even with that as a net space, you'd be much better off with a single 15, because two would be asking for air that isn't there. What are you putting this in? Maybe you have more space to work with so you can fit two 15's... Quote POTATO! Link to comment Share on other sites More sharing options...
trjohnst Posted May 7, 2011 Author Report Share Posted May 7, 2011 Yes, this is gross dimensions, only considering about half the thickness of the wood, which is 3/4 inch. Thats what I am trying to run, a single 15. Thats why I was seeing if patching over the other hole, and using one 15 with 2 4" ports at 9" length would be best. Quote 1991 Accord Audioque HDC3 15" (Copper)<--Sub Audioque HDC3 15" (Copper)<--Backup Sub Crescendo BC2000D<--Amp Big 3 1/0 Knu<--Wiring Eonon 3.5" DVD<--Headunit Infinity Kappa Perfect<--Mids & Highs 2nd Stock 80Amp alt. 1991 Mustang 5.0 Too many mods (Sold) 1991 240sx SR20 Red Top Too many mods (Sold) 2004 GTO Just starting mods Link to comment Share on other sites More sharing options...
trjohnst Posted May 7, 2011 Author Report Share Posted May 7, 2011 Also, if I add the 2 4inch ports at 9" length, do I keep the flare in the inside or take it off, having a straight pipe with no flare in the inside of the box? Also, since I can only put the ports 1 way, on the side because the box is about 30 inches long, where do I start to measure the 9" at? Quote 1991 Accord Audioque HDC3 15" (Copper)<--Sub Audioque HDC3 15" (Copper)<--Backup Sub Crescendo BC2000D<--Amp Big 3 1/0 Knu<--Wiring Eonon 3.5" DVD<--Headunit Infinity Kappa Perfect<--Mids & Highs 2nd Stock 80Amp alt. 1991 Mustang 5.0 Too many mods (Sold) 1991 240sx SR20 Red Top Too many mods (Sold) 2004 GTO Just starting mods Link to comment Share on other sites More sharing options...
94retta(219) Posted May 7, 2011 Report Share Posted May 7, 2011 Cut a circle out of wood to plug the hole for the other 15 then buy 3 4in areo ports and make them external. Keep them close together. Someone will need to tell you the length. Im on mobile. But 3 4in should be about right Quote BUILD LOG Link to comment Share on other sites More sharing options...
bassrace Posted May 7, 2011 Report Share Posted May 7, 2011 If you did 3 4" ports tuned to 34hz with 4.8 ft3 of box space they would need to be 16.38" long but i dunno if you need 3 that seems like alot of port area for 1 15 but i might be trippin there a great calculator for aeroports on. psp-inc.com Quote 145.9@40hz 145.3@34hz big 3 X2 group 34 Deka Group 31 All 0/1 awg jl meta wire Alpine CDA 7894 Orion HCCA D5000 2 AQ HDC312's Crunch gpv1100.2 (for 6.5"s only) AQ pro audio 6.5" - 3 sets AQ supertweeters - 2 sets 2000 Slamry Link to comment Share on other sites More sharing options...
94retta(219) Posted May 7, 2011 Report Share Posted May 7, 2011 How much port area would that be? Like i said im on mobile so i cant do it. Should be around 16per cubic foot right? If you did 3 4" ports tuned to 34hz with 4.8 ft3 of box space they would need to be 16.38" long but i dunno if you need 3 that seems like alot of port area for 1 15 but i might be trippin there a great calculator for aeroports on. psp-inc.com Quote BUILD LOG Link to comment Share on other sites More sharing options...
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