bkolfo4 Posted March 17, 2014 Report Share Posted March 17, 2014 I still don't understand how it could be free-airing if it is still in an enclosure and still has a first and second resonance. Current system: 1997 Blazer - (4) Customer Fi NEO subs with (8) American Bass Elite 2800.1s Previous systems: 2000 Suburban - (4) BTL 15's and (4) IA 40.1's = 157.7 dB at 37 Hz. 1992 Astro Van - (6) BTL 15's and (6) IA 40.1's = 159.7 dB at 43 Hz. Link to comment Share on other sites More sharing options...
Seymore Posted March 17, 2014 Author Report Share Posted March 17, 2014 This is actually really interesting. So, it's perfectly fine to have a huge port as long as you can set your subsonic/gains right? it'd actually be a really good idea for those watt limit competitions. 2001 Civic LX SedanPioneer DEH-7500HD Big 3 in 1/0 Knu CCARockford P500-4RF Punch P165-S in doorsRF Punch P165 in rear deckFront doors deadened with DamplifierNextSQ's new HDS208 8" in a T-line whenever it FINALLY COMES OUT I CAN FINALLY AFFORD IT Bend over and I'll show ya. how is it 2 days work? half a day at most, i may be an idiot, but im not an idiot. Link to comment Share on other sites More sharing options...
Seymore Posted March 17, 2014 Author Report Share Posted March 17, 2014 "2 18"s walled on 500 watts hitting 151.3" 2001 Civic LX SedanPioneer DEH-7500HD Big 3 in 1/0 Knu CCARockford P500-4RF Punch P165-S in doorsRF Punch P165 in rear deckFront doors deadened with DamplifierNextSQ's new HDS208 8" in a T-line whenever it FINALLY COMES OUT I CAN FINALLY AFFORD IT Bend over and I'll show ya. how is it 2 days work? half a day at most, i may be an idiot, but im not an idiot. Link to comment Share on other sites More sharing options...
Krakin Posted March 19, 2014 Report Share Posted March 19, 2014 I want to go back and correct myself when I said "5 m/s port velocity". I was just rereading the paper by Richard H. Small and he said that it should be near 5% the velocity of sound. I messed the first time I read this and read it as 5 m/s, I'm not sure how, but I did. So now to correct myself I should have said 17m/s (at sea level) not 5. Krakin's Home Dipole Project http://www.stevemeadedesigns.com/board/topic/186153-krakins-dipole-project-new-reciever-in-rockford-science/#entry2772370 Krakin, are you some sort of mad scientist? I would have replied earlier, but I was measuring the output of my amp with a yardstick . . . What you hear is not the air pressure variation in itself but what has drawn your attention in the two streams of superimposed air pressure variations at your eardrums An acoustic event has dimensions of Time, Tone, Loudness and Space Everyone learns to render the 3-dimensional localization of sound based on the individual shape of their ears, thus no formula can achieve a definite effect for every listener. Link to comment Share on other sites More sharing options...
bushroot Posted March 21, 2014 Report Share Posted March 21, 2014 The smoothest low end you'll ever hear. At 17hz, my power meter slaps the side of the house! How does it compare to IB? I'd say it's similar, but I would say the same speaker on the same output power would give you more output. How much? I couldn't tell you. Someone once suggested nearly 3 db, since you're effectively doubling cone surface area. I've never measured to be honest and my "test box" is still sitting in my living room. That's not because I've been lazy, but because it sounds pretty damn good and no one I know is willing to put the thing in their home theater due to SWMBO factor. It's ginormous! I'd hate to cut it apart, since there's nothing wrong with it. I even offered it to my buddy for $100 (much less than the cost of wood), but his wife said "hell no!" Link to comment Share on other sites More sharing options...
Aj11 Posted March 21, 2014 Report Share Posted March 21, 2014 great thread! wish i understood a Lil more of this. I've been into car audio for 13yrs now but only got interested in the enclosure part a months ago. i was all about the electrical side of this addiction. i knew boxes were important but never cared to learn. then boom its all i want to know and learn about! from reading this looks like i have allot of research ahead of me today! jvc deck stinger 1800 front hc 2000 kinetic rear 2 runs of 1/0g big 3/4 ct 60.4 2 ct 1400.1 ct EXO 15 d1 lots of deadner type r comps front stage 6 kicker tweets rear stage lots of great stuff coming soon ho alt more bats ct comps for front stage more deadner sweet amp rack lots of L.E.D lights new deck (thinking 80 prs, or flip out) Link to comment Share on other sites More sharing options...
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