KiKaZz74 Posted August 13, 2013 Author Report Share Posted August 13, 2013 Any of the iso boxes look badass I think. Dont gain anything with them really tho. My SPL to SQ Build Log Vehicle:1997 Dodge Dakota Ext Cab 4x4 2009 Dodge Journey SXT5.2L V8 Magnum 3.5L V6 Stock AltEquipment: Headunit- Alpine CDE-147BT Mids/Highs Amp- JL Audio G6600 Class AB 6 Channel Sub Amp- Hifonics BRZ1700.1D @ 2 Ohms Taramps DSP3000.1D Sub- Hertz Hi Energy 12" HX300D SounDrive SDA3 12 Tweeters- Rockford Fosgate Power Series Silk Domes Hertz Hi-Energy Mids- Dayton Audio Reference 4" Full Range Drivers Midbass- Silver Flute 6.5" Hertz Hi-Energy 6.5" Processor- MiniDSP 2x4 RCA- 6 channels of SounDrive HF series Wire- EB Flex 2/0 -Member of Team SounDrive Link to comment Share on other sites More sharing options...
bigmizzle99 Posted August 13, 2013 Report Share Posted August 13, 2013 Can anyone tell me....What does the "8th" in 8th order mean? What does the "order" in 8th order mean? Camaro SS Build Altima build 2.0 Altima build 1.0 Link to comment Share on other sites More sharing options...
Karkov Posted August 13, 2013 Report Share Posted August 13, 2013 2007 Chevy Tahoe (SOLD) 12 ~ FI Audio X series 10" w/BP option 2 ~ DC Audio 5.0K @0.67 3 ~ DC Audio 5.0K @1.0 2 ~ PPI 3 way sets (not installed yet) 1 ~ RF T400-4, 1 ~ RF T600-2, 1 ~ RF T600-4 4 ~ CT Sounds 5.25" Strato comps (rear fill only) 1 ~ XS Power D4800 1 ~ XS Power D3400 8 ~ XS Power XP3000 160 stock alt, Mechman 370 Elite, 185 DC Power 320+ Sq. Ft. Sound Deadener Pioneer AVH-X5500BHS Youtube: https://www.youtube.com/user/knfjdkghjudfhsgkjdhf/videos?sort=dd&view=0&shelf_id=0 Link to comment Share on other sites More sharing options...
TaylorFade Posted August 13, 2013 Report Share Posted August 13, 2013 The "order" of a box actually refers to the rolloff. It has nothing to do with the alignment really. Like a 4th order crossover rolls off at 24db per octave, a "4th order bandpass" rolls off at 12db per octave below tuning AND above (hence the 4th order designation). Just as an aside... a regular ol' ported box is actually a 4th order. A 4th is more accurately a "single reflex bandpass". The box pictured is just a aperiodic bi-chamber. It's not really an "8th order". And ABC's aren't any bigger than a standard vented. They're just parallel tuned in octaves. And 8th would be like a "6th order" inside of a 4th order. And yes... it would be hyooooooj. Link to comment Share on other sites More sharing options...
Krakin Posted August 13, 2013 Report Share Posted August 13, 2013 Can anyone tell me....What does the "8th" in 8th order mean? What does the "order" in 8th order mean? Taylor beat me so if his is better (most likely is) use his. A fourth order has a sealed back chamber with a vented front. A sixth order has rear vented and front vented chambers. An eighth order has three chambers. All three are vented. With the front and rear chambers of the sixth order vented into another chamber. 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...
Afficionado Posted August 13, 2013 Report Share Posted August 13, 2013 some good info developing here. in for more. If you have any questions relating to nutrition, lifting, or health in general, feel free to give me a PM and I will give you straight forward advice with no BS involved. Link to comment Share on other sites More sharing options...
bigmizzle99 Posted August 13, 2013 Report Share Posted August 13, 2013 Yes, I do know that a 4th order is a ported box. I didn't realize it was because of the rolloff slope. I don't think people understand that, then. Why would anyone want a subwoofer with an 8th order rolloff slope? Just for SPL competition? if you had no subsonic filter, maybe that would be handy. But any amp today has a subsonic filter. My personal choice is to extend low frequencies as far below tuning as possible without over excursion or unloading of sub. Camaro SS Build Altima build 2.0 Altima build 1.0 Link to comment Share on other sites More sharing options...
TaylorFade Posted August 13, 2013 Report Share Posted August 13, 2013 Yes, I do know that a 4th order is a ported box. I didn't realize it was because of the rolloff slope. I don't think people understand that, then. Why would anyone want a subwoofer with an 8th order rolloff slope? Just for SPL competition? if you had no subsonic filter, maybe that would be handy. But any amp today has a subsonic filter. My personal choice is to extend low frequencies as far below tuning as possible without over excursion or unloading of sub. An "8th order" would have a retardedly small bandwidth but have enormous gain/efficiency. If you could do it right, it'd be an SPL monster. Incidentally... if you also add a crossover to your 4th order (or whatever) you add an order. Add a 2nd order crossover to your ported box and voila'... you now have a 6th order and you're cool. An 8th order's rolloff would be 24db above and below tuning. Not 48db either way.. LIke... a 6th is 24db per octave below tuning but only 12db above tuning. Link to comment Share on other sites More sharing options...
Krakin Posted August 13, 2013 Report Share Posted August 13, 2013 I been looking at the Bose Acoustimass design and from what I can see this is the outcome. with Qts=.42, Vas=.46 ft^3, Fs=56you should getV1= .68 ft^3 Fb1=78.85 HzV2= .35 ft^3 Fb2=39.77 HzV3= 2.98 ft^3 Fb3=Fs=56 HzF3Lower= 36 HzF3Upper= 87 Hzbandwidth= 51 Hz 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...
TaylorFade Posted August 13, 2013 Report Share Posted August 13, 2013 I been looking at the Bose Acoustimass design and from what I can see this is the outcome. with Qts=.42, Vas=.46 ft^3, Fs=56 you should get V1= .68 ft^3 Fb1=78.85 Hz V2= .35 ft^3 Fb2=39.77 Hz V3= 2.98 ft^3 Fb3=Fs=56 Hz F3Lower= 36 Hz F3Upper= 87 Hz bandwidth= 51 Hz That's all well and good... but can you extrapolate the calculations? Link to comment Share on other sites More sharing options...
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