Hey, picked up some support from Elemental Designs... looking at 2 of their SQ10 10" subs... 3" deep, sweet 10" subs for my kicks, with some 4" Peerless drivers beside them for mids, and 2 19ov.2's... (18" subs) for the trunk, mounted IB just to hit under 30 Hz....

once I get some cash and start the build.. I'll keep everyone updated!

anyone have thoughts?

 

way too much effort o put a 10 in the kick. getting the correct airspace and a solid baffle is difficult enough and just the fact that an 18 is still needed makes it a little pointless. remember that the midbass position is the critical element in a good soundstage, especially if you arent band iading with time delay and want 2 seat performance. i would put more effort into location than size.

 

Why? 10" in the kick..... hope its an automatic, sorry just dont see the reasoning here

 

18's?? why so big?

ive just always herd that the smaller the sub the better sq.

then again i cant really talk about sq, cuz everytihng i have is audiobahn... but still does anyone know if thats true?

 

Well I, for one, can't wait to see the project get underway...and finished!

On a side note, I don't know if you saw that my Lancer was broken into, but I have some new eD goodies on the way as well! My new stuff will be a bit (ok, a lot) more low key, but let the new projects begin!

Good luck!!

 

The 10's I'm using are 3" thick, and need 0.3 cubic ft of airspace... they're going to play between approx 30 and 180-250, then the mids will take over.

the 18's are there just for some authority below 30 Hz... got some tracks on the IASCA discs that get super low... the one ends in an 18 Hz note, but there are some lower notes in there too. plus the SPL portion of Iasca was killing me with a single 12, so I figure 2 18's should get me over 135 easy with 1200 RMS to them.

 

Why not put those shallow mount 10's under the front seats? Would make for a lot nicer install, and I don't see sound suffering that much from it in all honesty.

 

Reading this makes me wish that dB Drag was still in the northeast.

 

FIR SQ PURPOSES THE MIDBASS LOCATION IS THE MOST CRITICAL ELEMENT. IN EVER CAR I HAVE MEASURED THE MIDBAQSS ARRIVAL WAS FIRST IN A 3 WAY SYSTEM. THIS INCLUDES FORD DOOR MOUNTED MIDS THAT ARE HALF THE PHYSICAL DISTANCE THAN THE KICK PANEL. THE SURFACE AREA, RADIATING PATERN AMD SLOW RESPONSE WILL MAKE THIS DIFFICULT TO TUNE.

THE 18 IS A GOOD IDEA. THERE ARE MANY PRO AUDIO SUBS THAT CAN GO DOWN TO 18HZ AND PLAY TO 150HZ IN A 10-12 CUBIC FOOT ENCLOSURE (EVO TRUNK FREE AIR). I BULT A RANGER BACK IN THE DAY THAT USED 3 18" FREEAIR AND WOULD HIT THE 135DB CAP FROM THE SEAT AT 14hz. we used a single 18 for sq and even though it was a standard cab pickup it sunded good enough to be 2 points shy of world champion. some big subs sound excellent if used properly.

sorry aboutt the caps, i dont feel like retyping this on my BlackBerry

 

blackberries rock... they make them about 5 minutes from here at RIM in waterloo.

Alpine PXA-H700's rock too... the car will be a 1 seat wonder for this year, but hopefully I'll be able to get it rocking for 2 seats as well.

I'll be doing 90% of the tuning with the install... speaker placement, aiming, phasing etc. and the rest will be with acoustical treatments and the H700.

The subs I'll be using are from http://www.elementaldesigns.com a small company that makes great subs and amps (if you remember the Tsunami amps of a few years ago, they're identical to the original ones, plus they've added a couple, with more to come)

the SQ10 is one of the best slimline sub ever made... Xmax of 18mm (9mm one way) FS of 25, 0.3 cuft sealed enclosure required, and very light. and the 19Ov.2 is a great 18" sub, that can go in any cabinet, and doesn't hog the airspace. but IB, I figure it'll be pretty flat below 10 Hz.

The vifa tweeters and Peerless mids will be powered with 200 RMS each, for killer headroom, as will the 10's in front, the 18's will get about 600 RMS each... but considering downsizing to 1 18, with 600 on it.

2 18's in a trunk will be a first for a lancer I think.

 

I doubt there is enough room for the two of them. The free air idea that bill ace was talking about I think may be the only solution for a single 18.... they are just too big man....

 

Typically you would want to add delay to the entire front stage in order to match the slow arrival of the sub. Its easy up front bass with the baby F1. you might run out of available delay for good W seat performance without some serious chassis modification. I know the Lancer is a little different than an Evo but I don't recall much more than rook for an 8. I only went 6.5 to use the stock kick panel and i still enlarged them.

 

THe sub(s) will be free air. that's what IB (or infinite baffle) means. and there's LOTS of room.. I've already removed the torsion bars and mounted a gas shock to take the weight of the trunk. there's almost 21" of height. and there's 38" of width at the floor

Bill: this is Iasca... the front seats will be modified to basically sit in the back seat, so the delay won't really be an issue, the 18's will be about 1 ft away from the listener, and the front stage will be about 6 ft away

 

Don't be fooled by the physical distance from the sub. The wavelength of some of the frquencies you plan to play is over 56' long Your midbass drivers will arrive much slower than the other speakers. I wouldn,t be surprised if the drivers side mid has a longer arrival time than the passenger tweeter. The passenger midbass will likely be way behind the rest ofl the front stage. Your big obstacles will be mounting a 10 with enough of a physical differencr in distance, and the broad dispersion pattern the speaker will have. There will be a lot of midbas reflection to deal with because of this and the wavelength of midbass frequencies. It can be done, it will be a lot of work that may not be worth the end result but there is only one way to find out. You will need plenty of delay, don't go by what a ruler tells you.

 

I'm planning to treat my footwells, and the underside of the dash with some pretty heavy acoustical treatments. keep the reflection down as much as possible, mount some baffles under the dash, and behind the center console, as well as carpeting as much of the plastic as I can, with some foam behind to absorb most of the acoustical energy instead of letting it reflect.

I never tune by numbers, I always tune by ear, and use high end home systems as a reference.

my main goal is to have a front end with some authority, and to be able to listen on a daily basis to it, as well as pound anybody local into the ground at stoplights LOL.