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Anyone ever tried a down firing sub in a suv? Just wondering, for I am thinking about going to a larger enclosure (width-wise), but I'm still trying to keep as much hatch space as possible. Replies (32) ttocs on 06/25/2006 16:57:52 They sound as good as any other sub in a sport utility. You will need to leave space below the box so I don't know how you think you will have more space? swez on 06/25/2006 17:55:15 Sure, this will work fine as long as you have adequate clearance between the sub at max excursion and the flooring. If the sub is angled so you have more clearance at the front of the passenger's seat, then at the rear, all the better as we get a scoop type effect to allow more sub frequencies out into the cabin, as opposed to reflecting back into the woofer cone. Swez Ash on 06/25/2006 19:01:27 Thanks. Sounds like a plan in the making. Actually Ttocs, it will be more usable space by means of not having to worry about baggage blocking the sound. I'm going larger to get a little lower F3 with less thump. Instead of more cubic, the box will be low profile (rectangular) as possible with the width making up the difference. By rear facing the output I still should get good output with less phase issues. Another advantage will be when putting in baggage, it could actually be put on top of the box without blocking the sound. Thus more room hypothetically speaking. Make sense? MrBrownstone on 06/26/2006 14:30:45 The nice part about an SUV is ...unless it's one of those girl-sized ones...they don't have a whole lot of issues wherever you place the box. dkh on 06/27/2006 12:03:45 Off topic but please define a girl size suv. I drive a 94 chevy s-10 blazer and i jacked it up 6 inches, i really dont consider it girlish but i geuss to the guy that drives an expedition with a 10 " lift on it with 48" super swampers then yeah i geuss i am not quite at the same level. However, the chevy vibe does get 40 - 50 mpg if you can handle the jeering and laughing and pointing from your coworkers and general public. nuff sed. dkh on 06/27/2006 12:13:32 Sorry if i offended anyone, actually my dad keeps telling me to buy the vibe just due to simple economics, we are scottish. Back on topic, i just mounted my sub downfiring yesterday after reading this post a couple of days ago. It has alot of benefits, since now i dont have it sitting on the rear seat and also the ability to stack things on it seems logical. As for the sound quaility I havent figured that out yet as my sub is still being broke in but when it is done later on I will poste my experience. I also mounted the box utilizing two thick sheets of plywood on each side of the enclosure (parrallel to the sides of the vehicle). With this setup I can play around with the angle of deflection to attain maximum sound quaility if the need arises. I currently have it at approx 15-20 degrees with the floor and I aimed it at the rear so that hopefully the waves will bounce off the floor, hit the rear glass then hit the front windshield and then hit me in the face. Anyone know if this will actually work? Cheers, Dave cplkittle on 06/28/2006 20:31:02 had to take the back seat out of my girl-sized kia sportage to make room for more of those big round loud things. swez on 06/29/2006 09:16:26 Hehe... this is getting pretty funny. Transportation is neither Macho or Fem. However, a "Pink Blazer" would send some mixed signals if a dude was driving it. GRIN Swez Ash on 06/29/2006 18:36:56 Oookkaaay. Umm kinda speechless at the moment. Anyway, after listening for a while with this mega watt sub beating down the back of my auto, I finally realized after some retuning to a lower crossover point and gain setting that I don't need it. It's was nice and loud but I'm getting too old to "boom the block". I'll leave that to the "Jitta Bugs". I went back and finally ordered some eights that I've been working through WIN ISD for a good while now. The minimal required space and available F3 (36hz) ported will be enough for me as I continue to strive towards a low profile SQ setup. Was just tyring to implement new ways to maximize my install. dkh on 06/29/2006 19:05:31 Im pretty sure that we are all straight men here, (and possibly a couple of coked out strippers as well), so it really shouldnt be a big deal to joke around about faggy pink vehicles. Unless of course someone is intolerant? Which of course being a redneck oil patch mfer... im all over the intolerance like white on rice. MrBrownstone on 06/29/2006 19:24:56 If you have to remove the back seat to put in a woofer box, it's a girl-sized Sport Futility Vehicle. I'm sorry, but I live in Southern California. Unlike DKH, women in southern california are substantially smaller than the men--hence the term 'Girl-Sized' SUV as it's understood in this part of the country that women are smaller than men. Evidently in DKH's neighborhood, they don't have belly rings, they have trailer hitches. GIT-R-DONE!!! USFLAG swez on 06/29/2006 20:56:19 Easy there DHK... this site is rated PG. We don't need profanity or colorful commentaries to get the point across. The Boss is pretty mindful of this board and we don't want to mess with his excellent reputation. Thanks for your full cooperation, Swez dkh on 06/29/2006 21:56:54 Ok, sorry i dont want to offend anyone and I am fully capable of following the rules. Sometimes inititally people are offended by me and my style because i have to admit i do work and live in a pretty redneckish environment and somtimes rather than overcoming it i succumb to it. Again I apologize, I do not mean to offend anyone. Peace DKH Ash on 06/30/2006 13:04:07 No sweat. We all get a little carried away at times. Just remember that behind the keyboard people from all walks of life maybe sitting, but here we all have one thing in common. Ash on 07/1/2006 13:56:44 One question before I begin this project. I've noticed on other down fire boxes (mainly trucks) that only the sides was touching the floor (for lack of better words). Should this be done or would you leave one side open (front or rear) to concentrate the output into one direction? dkh on 07/1/2006 17:18:16 I left approximately 2 inches open on the one side and about 3-4 inches on the other that faces the rear most part of my vehicle so that the sound will bounce off the back and get to the front. It is working pretty good. swez on 07/1/2006 17:42:57 Right...this allows the sub wave energy to escape with minimal direct reflections, back at the cone. This is a very good thing to consider in a truck mounted, down-firing sub box and close airspace tolerances. Swez Ash on 07/2/2006 10:40:13 Oooppsie! Ran across a stumbling block yesterday. With all the confusing data from P.E., WIN ISD, and the subs recommended box on the included paper; somehow I came up short on my airspace. Now I'm going to have either start over or augment what I have to attain what I want. The tech claimed 2.3 cft including displacement of drivers and port of 4" x 14.25. When I ran the numbers my self, I got totally different (1.729). Not sure what program he was looking at, but I did mention to him I was working off WIN ISD. In the meantime, I now have a almost useless box except that it somehow winded up being a perfect fit for the other 8"s I had lying around. I guess this would be a good time to see what changes downfiring will make seeing that I already know the response of the Credences in a standard vented box. My advice to you guys: don't work with a tired mind and starved belly! Take plenty of breaks so you will have time to monitor any progress. Lol! Ash on 07/2/2006 18:02:52 Okay!!! The results are in! First let me describe the box at use: The box is 40" wide by 8" tall (10" with legs) by 10 deep. The legs are integral to the sides and front (looking back from the front of the cab). The sub's outlet is a 2" by 38.5" "gap" underneath where the subs lay. With a total of 1.23 cft minus driver basket & vent displacement (.17), I was left with no choice but to tune the vent to around 41-42hz. Both sub's are located to the furthest most corner of the passenger side while the 4" x 14.25" length round port is located adjacent. The port is firing directly at the driver's side rear quarter panel with about 4-5" from paneling. I used this technique as I thought it would help improve both the subs' and port's output. As I am currently using a USB2150 for sub power and the Credence subs are 4 ohm; I found it imperative to wire them in series to an 8 ohm load. This was done as there can be no divider with a single port in the box, so I had to insure they we seeing the closely the same signal at all times. Now they are only being fed up to 225rms total. This also helps as they are in a larger than recommended box which will reduce power handling somewhat. At first I used about a 1/2 pound of stuffing only directly behind the drivers. This produced an odd effect as the sub closest to the port played looser on some boom tracks. Seemed like the stuffing was choking off the sub farthest away from the port. After removal, both subs acted accordingly, so there is no stuffing to this enclosure. As for sound, you would think that high tuning (40 hz) would make for a thumpy sub with no low end. Not! Low end was definitely present with a smooth fullness. Thank goodness for transfer function! In fact this setup blended better than the 12" I was using. Bass is more upfront without an overly exaggerated rolloff. Now there is a nice smooth punch rather than a hard snap with a overbearing midbass. It almost resembles that of a bigger sub in a low to mid Q sealed box but without the low end overhang. Very musical. I must note that there is some need for a subsonic filter, but only on the lowest of boom tracks. Some Fmods should take care of that. I audittioned them on some jazz, hip hop, and electronica as well with good results and no need for a SSF. As for a daily driver, this fits the need very nicely. I was impressed so much by the turnout that now I am sending back the unused Quattros and the 12" will be stored for a rainy day project. I know this was rather long, but I figured some of you wanted to know how it would turn out. swez on 07/3/2006 19:26:22 Good feedback here Ash!!! This project seems to have brought your old Credence 8's back to life with very good results. This is probably worth marking as an FAQ topic or summerize and add to CK's DIY article list. Well done sir!!! Swez dkh on 07/3/2006 20:17:49 I have some pictures of my downfiring sub enclosure / 6x9 rack and my other non powered (thus far) sub on top of the rack. Check it out, I get real good sound from the contraption and the look of it might enthuse you (frighten some no doubt). http://photos.yahoo.com/dakota_kawasaki_hybrid Cheers DKH Ash on 07/3/2006 21:56:57 Thank you Swez. Any encouragement is a help. While my lady was asleep, I sneaked out and traded her ported 10" for the downfire setup in the van. I rewired it to a 2 ohm load and set her SSF. Sounds pretty good in the Safari with the music she listen's to (southern rap, blues, and r&b). She can't be an audiophile for she had to see her old box on the porch, but never said a word?!!! dkh on 07/3/2006 23:20:10 Hey man, kudos on you for sneaking that by the wife, just dont get caught or she won't trust you anymore. Good relationships require trust though, so you may want to tell her what you did anyways. I am glad that you have an even better stereo system, there aint enough audiophiles in the world. Cheers DKH Ash on 07/4/2006 22:18:00 Nah, she won't mind. She knows I'm always trying different ideas. Actually she probably feels lucky in that she gets free stuff. My next project with the downfire will probably be something more compact with a decent performance. Always looking for something new, ya know. dkh on 07/5/2006 00:05:25 My type r alpine ten inch is pretty compact, the box is only like 1 cf sealed. It is pretty decent and i find with it bolted to the floor and being solid that it helps alot as the sub is then rigid to the body and i think the effect of the woofer is better on the "big box" (rear end of my entire suv). It may not be what your looking for though as you have a lot more experience with car audio than i do. I am a relative newbie, but this sub is the best thing i ever did to a vehicle... other than rolling my 87' dodge dakota, but thats another story. DKH Ash on 07/5/2006 19:22:00 The one factor that you will have to get past is the amount of SPL that you have become accustomed to as that will be the main sacrifice in a compact system. Think about it DKH. As you get older and then start to realize that regardless how clean it sounds; it is the excess levels that will irreversibly harm your hearing. You should only need enough to overcome roadnoise and such in order to hear the full available range. What other way can you still enjoy full sound without having to pump it up so loud or use "mega subs" ? This points in way of not so much concentration into power, but how much can you make the auto environment quiet so gobs of power is not needed to attain good results. That is a tough task alone. Once you accomplish that, then you can begin to scale down a system to be more efficient. Sounds like a "pipe dream"? Well it's not, and car manufacturers are already on this idea, but charging big bucks for it. dkh on 07/5/2006 20:24:22 Well I know for a fact my sisters ford taurus with her stock stereo probably has better sound than my system in my rattly ol' blazer thats jacked up, has carpet removed from the rear, windshield doesnt seal properly and gets water shooting in like a fountain right in the front of the stereo when driving in the rain or using the wiper nozzle sprayers. But my blazer i dont worry about it, i can run over a deer a couple times and have the quarter panels enialated an i probably wouldn't even fix it, cept if the ol' lady complained about the mulee guts an blood all over it..... thats why i love my blazer. No offence spl is not of huge concern to me at this stage in my life but worth considering. Cheers DKH DKH BgDustin4 on 07/6/2006 12:19:57 OT i would drive a pink cadillac escalade lol swez on 07/6/2006 16:33:23 That... I would pay to see. Keep on truckin there Big D!!! Think BIG, hang on to your pocket change and someday, you'll have that Escalade. 8-) Swez Ash on 07/6/2006 18:21:33 If it's SQ you're craving in the blazer then carefull attention will have to be paid to what route to take. You could waste a lot of money and time trying to get it right without eliminating what's holding you back first. Blazer's are noisy! Take it from me, cause I'm living proof! bgmikeseay on 03/9/2008 07:58:33 I'm not sure exactlly how it will sound in a SUV, I've been really curious though. I have a down-fire in my Dodge and for only being 2 tens poeple are generally surprised. I'm really happy with the whole set-up, and not to mention it looks so clean not being able to see the subs, or anything for that matter. A friend of mine has a 99 Mustang and we were going to build a down-fire to put in it, but it just has'nt became a priority yet. Personally I would try it, and see what you end-up with, you never know it could sound better than you ever imagined! Ash on 03/9/2008 08:18:22 The main thing in this hobby BG' is don't be afraid to experiment. Yes there are some hard fast rules to the science, but there is an art form to it as well that requires some venturing out in order to find out. Down firing is nothing new and does have cons as well as pros. The advantage to any particular setup will not be known unless tried.... Copyright ClubKnowledge 2009 * All Rights Reserved |