Cj Kumz Posted July 15, 2014 Report Posted July 15, 2014 Just a thought here. Ok the general rule for slot ports is 12-16 in2 per cube. So what are the effects on the sound if you closer to 12 in2 per cube versus being closer to 16 in2 per cube? Also here some go above to like around 18 or more. Any thoughts over this Vw Polo Pioneer Deh-6050UB Sundown Saz-3500d DD Audio 9500 15'' 5.5 cubic feet box with 10 inch port @ 38hz I live to hear the Bass drop!!!
audiofanaticz Posted July 15, 2014 Report Posted July 15, 2014 It comes down to numerous things. More port area will make the enclosure more efficient and also help a little with impedance rise. Typically more port area will be louder, look at some of the walled vehicles that burp at a high frequencies and dont play music just test tones. But at the same time more port area is going to sacrifice more box volume, and if your working with a strict enclosure that cant be made bigger that added port displacement may hurt the over all performance. You also have to worry about your woofers unloading due to the spiders not being too loose in stiffness. You also have to remember things such as a box that has 50sq inches of port that is tuned to 35hz is going to need a way longer port than a box with 30sq inches of port tuned to 35hz. Ultimately its a juggling act that is going to come down to your woofers their powering handling and how stiff of a suspension they have, your amplifiers and how much power your giving them or if your giving your woofers more than their rated rms power, your box size is going to have a huge play in it as well, as well as what your wanting to get out of your system and the type of music you listen too or the type of competitions you may compete in. There is no right or wrong answer and a lot of it is going to come from experience, which means a lot of trial and error. By trial and error I mean by physically building boxes testing boxes etc, Not just "designing" box after box after box without actually building them to get a feel for what the changes your making on a box calculator are doing. One thing to keep in mind is just because it looks great on paper does not automatically mean it will sound great once built and put in a vehicle and have things such as cabin gain drastically change the way the enclosure performs, and sometimes performs for the worst!
Omega5002 Posted July 15, 2014 Report Posted July 15, 2014 It's not about how much port you have per cube, it's about total port area. Total port area is actually independant from volume. What Brian said was a very good and helpful explanation. 2003 Kia Sorento Team Subsonic LowsTeam Bassin' on a Budget2016 Rebuild Under Construction Best score: 150.2 at 40hz (3k, 2 Custom HDC3 15's) Usaci style(door open, in the kick)
fecupe2001 Posted July 15, 2014 Report Posted July 15, 2014 nice write up brian! Wanted to add, it also depends on the bandwith you want to play, bigger the port smaller the bandwith and viceversa I´m the SPL Gains topic creator!! wanna get louder?? check this: SPL Gains. Panamenian 2009 & 2010 & 2014 Bass Race 149.9 Champion! 2 15" subs and a 2K wired at 1 ohm, http://www.stevemeadedesigns.com/board/topic/167788-fecupe2001-2-15s-on-a-2k-video-on-page-3/ 8 Massive 15" subs and small power, http://www.stevemeadedesigns.com/board/topic/179296-fecupe2001s-8-15s-4th-order-bandpass-wall/
gckless Posted July 15, 2014 Report Posted July 15, 2014 Nice. Also to add, you can generally get away with less port area the lower you tune. "Clipping" is the biggest forum boner now. It's like witchcraft... it automatically explains just about everything people don't understand. My build log: http://www.stevemeadedesigns.com/board/topic/200295-gckless-2011-chevrolet-impala/ High resolution photos: Gilbert Kless Photography
Cj Kumz Posted July 15, 2014 Author Report Posted July 15, 2014 Very interesting points. Never knew alot haha. Thanks alot guys Vw Polo Pioneer Deh-6050UB Sundown Saz-3500d DD Audio 9500 15'' 5.5 cubic feet box with 10 inch port @ 38hz I live to hear the Bass drop!!!
audiofanaticz Posted July 15, 2014 Report Posted July 15, 2014 It's not about how much port you have per cube, it's about total port area. Total port area is actually independant from volume. What Brian said was a very good and helpful explanation. Its one in the same really, as your port area gets larger so does the port area per cubed. While port area maybe independent from volume, the actual port length, height, and width effects the box volume and must be included when subtracting displacements from your box just like you would with bracing, subwoo0000000000fers, 45s and so on
Krakin Posted July 15, 2014 Report Posted July 15, 2014 ^ I saw that.. 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.
MrSkippyJ Posted July 15, 2014 Report Posted July 15, 2014 It's not about how much port you have per cube, it's about total port area. Total port area is actually independant from volume. What Brian said was a very good and helpful explanation. Its one in the same really, as your port area gets larger so does the port area per cubed. While port area maybe independent from volume, the actual port length, height, and width effects the box volume and must be included when subtracting displacements from your box just like you would with bracing, subwoo0000000000fers, 45s and so on but the cubic feet of the box doesn't determine port area right? That is determined by the actual subwoofers and power running them right? Ports and enclosures in general are something I don't understand much of. F150: Stock 2019 Harley Road Glide: Amp: TM400Xad - 4 channel 400 watt Processor: DSR1 Fairing (Front) 6.5s -MMats PA601cx Lid (Rear) 6x9s - TMS69
fecupe2001 Posted July 15, 2014 Report Posted July 15, 2014 It's not about how much port you have per cube, it's about total port area. Total port area is actually independant from volume. What Brian said was a very good and helpful explanation. Its one in the same really, as your port area gets larger so does the port area per cubed. While port area maybe independent from volume, the actual port length, height, and width effects the box volume and must be included when subtracting displacements from your box just like you would with bracing, subwoo0000000000fers, 45s and so on but the cubic feet of the box doesn't determine port area right? That is determined by the actual subwoofers and power running them right? Ports and enclosures in general are something I don't understand much of. T/S Parameters on the subs, power running, bandwith you want to play, cabin, etc etc I´m the SPL Gains topic creator!! wanna get louder?? check this: SPL Gains. Panamenian 2009 & 2010 & 2014 Bass Race 149.9 Champion! 2 15" subs and a 2K wired at 1 ohm, http://www.stevemeadedesigns.com/board/topic/167788-fecupe2001-2-15s-on-a-2k-video-on-page-3/ 8 Massive 15" subs and small power, http://www.stevemeadedesigns.com/board/topic/179296-fecupe2001s-8-15s-4th-order-bandpass-wall/
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