dr_hypothesis

I'm looking to redo my wall for my BTL 18s. I'm currently using a Cactus 5kw, running it at .7. My electrical consists of a 200amp alt, XS d3400 under the hood and a d3100 in the trunk. I'll be adding a second d3100 during the rebuild of the wall. How big would you guys go for the amount of power I'm using? My current wall is 14 cubes (after displacement), 35hz tune, with 192" of port. The design was bad, hence why I'm redoing it. It's only doing a 151.5 at the headrest with the passenger door wide open. The way I have the port and subs I'm having some phase issues and I think I can get much louder then I am. This is just for daily driving with some competing on the side. I do MECA right now as it's the only comp org around these parts. Here's a pic of the current wall, the port is on the passenger side (this was before it was all the way sealed up, didn't know this design would be bad): With the rebuild I'll be doing the port across the top, so that should take care of most of my issues I hope. I was thinking of staying with 14 cubes, 35 or 34hz tune and bumping the port area up to about 240". Just trying to get a super loud daily driver with some tremendous low end. It does bang now, but I know it should be louder. Any suggestions?

I'll be redoing mine first or second week of august I think. Gotta schedule a week of vacation time right before school starts and get it done. I'm usually on Termpro the most, same name as here. Pretty sure I've seen you on there. Steve Stern was running the show we had up here May 31st, so he judged my car and it's M5. Might fuse in the future and see if I can go to lower class. I did a 124.7 in drive-by spl at the last show. That's with both windows down. I was told to have the driver's window up and passenger's side down to direct all the air at the mic. Is this usually louder?

I'm in Modified 5. Could go lower, but I'm unfused in the back at the amp right now. I also do the drive-by spl. My peak frequency right now is 39hz. It's a solid 150 at 35 to 40hz.

Alright, first post here, but I'm not a newb. Been building boxes and installing for 9 years or so. I just ripped my wall out of my 01 Implala (4 RE SX 15s, Mojo 4000d, 5 batts...) and I picked up a pair of Q18s from a friend of mine. The following equipment is being used: Alpine 9886, ID Chameleon Components, old school Orion 2500d (the all silver one) and an old Orion 300.2, alt is an Iraggi 200amp. After I ripped my wall out I ran just the 300.2 on my components and ended up with some horrible alternator whine. I've never had whine before. I used some muting plugs and think I narrowed it down to either the deck or the RCAs. I also cannot turn my deck up to my normal listening volume (26 out of 35) without it skipping no matter what disc is in there. This only happens when the sub amp is hooked up, I don't think it's caused from vibrating, because well there just isn't much bass. I have the 18s in an 8 cube sealed box (after displacement), running the 2500d at 1 ohm. When setting the gain on the amp, even if I turn it all the way up, I can't drive them into distortion. It's like the Alpine cannot drive the 2500d at all. This amp has always been like that, but never to this extent. It sounds like I have a couple of 8s or 10s in the trunk. I just purchased an Eclipse 8053 and I'm hoping it solves some of my problems, but maybe I'm expecting too much from the Qs? Just looking for some input/advice, as I'm stumped as to where to go right now.

Well, I'm at my parents right now. The Eclipse is in and all my problems are solved. No more alternator whine to start off with. I haven't tweaked amp settings yet, but I turned the gain all the way down on the 2500d and there is damn near as much bass now then there was with the gain maxed out with the Alpine. The Alpine must be FUBAR. Can't wait to turn it up and see what the Qs can do. I've been debating whether to build a new box. I know I can squeeze another 1.5 cubes in there, possibly 2 cubes. Anybody experiment with sealed boxes? I'll post my impressions when I get done tweaking amp settings in the afternoon. Maybe throw some pics up as well.

I do realize they're in the minimum recommended for a sealed box. The Eclipse arrived today, looks to be in damn near pristine condition. I'll be throwing it in either friday night after work or saturday afternoon. Have to go out to my parents to use their garage. It's only 2 degrees outside right now.

I realize it's not going to be like my wall was, that thing was pretty brutal. I'm looking for more sq then spl this time around. When I first got this car, I had a single 18 ported in the trunk and it wanged pretty good. At one point I had only a pair of SXs ported in the trunk and those seemed easily twice as loud as the Qs are right now. I know these are good subs, they shouldn't be this quiet. I'm ditching the Alpine and putting in an Eclipse 8053 and some new RCAs friday night or saturday afternoon. If everything is still crap, I might try one ported before I go back to the SXs (which I really don't want to do).