5K Mobile Electronics Posted January 14, 2011 Report Share Posted January 14, 2011 I've been in the business for the past 12 years, I've done my fair share of big builds.., but I've been roaming the SMD forums for the past week and checking out some of the builds going on here. I see one reoccurring theme(besides the big subs, lol), layer upon layer of mdf and 2.4's for the walls. I've never done a spl build, so seeing all those layers is completely new to me. One of my questions is, is there actually a noticeable gain in output from building them that way? Vs maybe using 1" MDF well braced internally? I've always been the type of installer who thought I should build everything so if this guy decides the get rid of the car/truck, we can yank it all back out and put it back to stock with minimum hassle, but after seeing some of the builds on here, I'm thinking of picking up a car to do one of these crazy spl perma-builds in. They've got me pretty curious. Another question was about the wiring, I've seen multiple alternators, but haven't really seen multiple 0awg's ran to the back, there's the possibility that I overlooked that part in some installs. Quote Check out our Youtube Channel and "Like" us on Facebook! Link to comment Share on other sites More sharing options...
STEvil Posted January 15, 2011 Report Share Posted January 15, 2011 There can be big gains when its done right, but when you go overboard with the mutli-layer baffle its not doing anything. About 3 layers of 1" is usually enough for a wall, assuming you add a bit of internal bracing too. Maybe 4 layers if you're doing a 4x18 or something more.. As to the multiple 4/0 2/0 1/0 0/0 etc runs, yeah you've missed them. They're there. Some people go a little overkill with them though, and i've seen a lot of them improperly insulated (read my sig). Quote MickyMcD - "Capable of making some serious trouser flapping volumes at where's-my-testicles frequencies, the Servo-Drives used to be fairly jaw dropping..." Any time you have have a power wire next to your frame put some rubber hosing (or cut up an innertube) around it. The wire is bound to wiggle (due to driving or flex) and the casing will eventually wear through. Hammerdown... 1% no links to outside websites, business related FB/YT pages allowed. Link to comment Share on other sites More sharing options...
Freshman6969 Posted January 15, 2011 Report Share Posted January 15, 2011 using trippi's hummer as an example, ric used i think 2 or 3 layers of 3/4 or 1" thick wood, not mdf, pine is alot more light weight and alot stronger and gives off better sound to some people, so ive heard at least, anyways that wall does not even vibrate what so ever even when playing low notes, that wall is build like a damn ROCK Quote Legal TL scores145.6 on the dash sealed up in the low 40hz area with the port out145.5 on the dash sealed up @30hz with the port inless then 1k clamped on a 3.5k! Why would you EVER WANT flex?huh?...flex is what can make the lows lower and more air being pushed correct? My FeedbackJeep-BuildlogPT LOSER buildlog Link to comment Share on other sites More sharing options...
StrongmanDesigns Posted January 15, 2011 Report Share Posted January 15, 2011 The layers are usually done as a precaution for playing very loud and very low. With a high tuned spl build you could get away with thinner walls without having to worry as much about stuff breaking. But the newer trend is to reach very high pressure levels at very low frequencies which is extremely destructive. Quote Link to comment Share on other sites More sharing options...
5K Mobile Electronics Posted January 15, 2011 Author Report Share Posted January 15, 2011 Thanks for the info guys, gives me some understanding about the layers, and now that you mention it, those low notes are pretty destructive, I ended up using fiberglass reinforcments inside the last big system I did because even with 1"mdf glued and screwed, it still managed to break apart the ports from the inside walls. Quote Check out our Youtube Channel and "Like" us on Facebook! Link to comment Share on other sites More sharing options...
n8ball2013 Posted January 15, 2011 Report Share Posted January 15, 2011 spl builds? These are daily drivers in a lot of cases. lol Quote THERE IS NO BUILD LOG! 1998 Chevy Silverado ext cab Alpine CDA-9887 4 Team Fi 15s 2 Ampere Audio TFE 8.0 2 Ampere Audio 150.4 3 Digital Designs CS6.5 component sets Dual Mechman 370XP Elite alternators inbound! 8 XS Power d3400 6 XS power d680 Second Skin Stinger Tsunami Wiring Sky High A Real Voltmeter not a piece of shit stinger. Link to comment Share on other sites More sharing options...
HHR Ed Posted January 16, 2011 Report Share Posted January 16, 2011 I've been in the business for the past 12 years, I've done my fair share of big builds.., but I've been roaming the SMD forums for the past week and checking out some of the builds going on here. I see one reoccurring theme(besides the big subs, lol), layer upon layer of mdf and 2.4's for the walls. I've never done a spl build, so seeing all those layers is completely new to me. One of my questions is, is there actually a noticeable gain in output from building them that way? Vs maybe using 1" MDF well braced internally? I've always been the type of installer who thought I should build everything so if this guy decides the get rid of the car/truck, we can yank it all back out and put it back to stock with minimum hassle, but after seeing some of the builds on here, I'm thinking of picking up a car to do one of these crazy spl perma-builds in. They've got me pretty curious. Another question was about the wiring, I've seen multiple alternators, but haven't really seen multiple 0awg's ran to the back, there's the possibility that I overlooked that part in some installs. Most of the builds on here are ground pounders and daily rides. So for pure SPL the techniques are going to be slightly different. Usually 2x4s are good for the ground pounders, but For SPL its better to weld in a steel cage using square steel tubes, and fill the tubes with a polyester resin/sand mix to reduce resonance. Then using Birch (not MDF) or Oak is preferred. Multiple layers is used for strength, and density. You can even use steel plates sandwiching concrete. But 4 layers of Birch on the sides, top and bottom work well. For the baffle, usually 6-9 layers of .75" works the best. Not only for rigidity and density, but for acoustic purposes. It gives the port it's length and keeps some back pressure from building up on the rear of the woofer cones. When all done right. In a Super Street car, these types of enclosures are good for 170+ dB if you can manage to ever get that high. The other types with 2x4s you have been mentioning are 160 dB boxes. Quote Ed Lester ShowtimeSPL Host Showtime Electronics Video MarketingMy old Build Loghttp://www.stevemead...08/#entry511451http://www.youtube.com/showtimespl 5 time dB Drag Finalist Last ride 2007 HHR, current dB 153.5 and bass race 149.4 dB. 153.0 dB on music New Ride, 2008 HHR SS. Build under way. Loudest score ever = 171dB 2009 dB Drag Racing, North American Points Champion Link to comment Share on other sites More sharing options...
HHR Ed Posted January 21, 2011 Report Share Posted January 21, 2011 resin/sand/cement mix is for 170+ cars Quote Ed Lester ShowtimeSPL Host Showtime Electronics Video MarketingMy old Build Loghttp://www.stevemead...08/#entry511451http://www.youtube.com/showtimespl 5 time dB Drag Finalist Last ride 2007 HHR, current dB 153.5 and bass race 149.4 dB. 153.0 dB on music New Ride, 2008 HHR SS. Build under way. Loudest score ever = 171dB 2009 dB Drag Racing, North American Points Champion Link to comment Share on other sites More sharing options...
AMI CUSTOMS Posted January 21, 2011 Report Share Posted January 21, 2011 I have multiple runs of 0/1 in my daily driver. I only used 2 layers of 3/4 mdf, that it most cases is way more then enough strength. Some people on here kill trees using 2x4 for bracing, it is quite frankly a waste of wood. Sure 2x4's will brace, but there are far better ways to brace a ground pounder. Quote TEAM SOUNDQUBED -- TEAM SOUTH TEAM S.O.B. - Founder & Captain 3x Streetbeat World Record Holder 2017 MWSPL 1st place Mayhem & 4th Xtreme 4 2016 MWSPL 1st place Mayhem/2nd Adv 4/2nd Xtreme 4 2015 MWSPL 2nd place Mayhem & 4th Xtreme 4 2014 USACI 2nd place Streetbeat 5 - 162.6 db 2014 MWSPL 2nd place Xtreme 4 - 144.9 db 2013 USACI 1st place Streetbeat 4 - 161.9 db 2013 USACI 1st place Street Q+ - 162.8 db 2013 MWSPL 3rd Kaos2 & 4th Xtreme 4 2011 USACI 2nd place MOD 1001-2k - 160.0 db 2011 MWSPL 4th place: Adv3 - 157.8 db, Kaos2 - 150s db, Xtreme4 - 140s db 2010 ARSPL 1st place 501-750 - 160.3 db Arkansas loudest Best score to date 164.4 db - Termlab Outlaw Streetbeat 4 - 161.9 db Streetbeat 5 - 162.6 db MWSPL on Dash Legal door open (Music) - 162.5 db Sealed on dash Legal (Music) - 161.1 db - Termlab THE BLACK NASTY CURRENT BUILD & FAB The Black Nasty (6) 15 Rebuild Log 2012 (4) 15 Walled Sierra Build Log Evo X build log Facebook page The Black Nasty Link to comment Share on other sites More sharing options...
audioanonymous Posted January 22, 2011 Report Share Posted January 22, 2011 Ed don't be telling everyone how to get loud. lol Quote Cactus Sounds USA Team Captain Multiple World Record Holders Link to comment Share on other sites More sharing options...
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