QuestionO.k. first off I do want good sound quality but I really want that loud low bass that thumps you in the chest!I have a Pioneer hp860 (I believe) flip down head unit with stock Pioneer door speakers.I figure as soon as I get these subs in I'll cop a 4ch.amp and replace the doors and such for better mids and highs.but for right now I just want to get the right box so that the subs can perform at their best.I actually have a friend at a shop I was gonna have build it but I wanted to get your advice on the box first.
AnswerFollowing up, just wondering how it's going. Wondering if you took some measurements and what you decided to go with on this.
Love to hear from you.
ok, well actually the kick in the chest beat is up higher in the bass range around 90 hz or so. By deep I mean around 30 hz. at 30 hz my stering wheel shakes up and down about 1/2 inch, my sunroof moves about 1 inch, all the exterior door pannels visibly are moving, your vision even blurs.
These subs are made for ported boxes. so your port tuning could be as follows:
40hz VERY loud, punchy bass, but poor bass below 30hz
35hz still very loud, usable bass down to 30 hz
30hz loud and deep bass, less punch, usable bass to 25hz
25hz flattest responce, very deep, less punchy usable bass to about 21 hz
Basically the higher you tune the louder it will be while sacrificing deeper bass. the lower you tune the less loud but the deeper it will play.
I have my mofo tuned to 30hz and it's so loud at 30 that i have the eq about 5db down at 30! Power acoustik recomends the tuning to be at 40hz because it is designed to be an SPL sub not a SQ sub so to get the most SPL this is about where it should be. since you are looking for a balance between quality and quantity I would recomend tuning to 30hz.
Since your amps have a subsonic filter set to 30 hz this may be good or bad. Some manufacturer's assure that their amps are flat to the subsonic rating and fall after that. some list the subsonic rating at the 3db downpoint. Even if the amp is 3 db down the port being at 30hz will be about 3 db up so you will get a nice flat responce. (remember mine sounds flat with 5 db down). you will need the subsonic filter turned on to prevent the sub from trying to make 20hz sounds that would make it flop around out of control.
for the best box design the bigger the better, these things can move a ton of air. I'm calculating that using 2 4" ports with flared ends at a 1.2" flare radius (as large as you can buy) you will have audible port noise just starting with only 200 watts on each sub. you will reach terminal air velocity inside the ports with 1000 watts on each sub so they simply wont get any louder with more power. If you could build each sub into a 5.5 cubic foot box you could use 3 4" ports and air turbulence would be reduced dramatically plus it would be almost twice as loud 2.3db with the same power from the amps!
sorry I'm going on and on. to sum this up I would tune the box at 30hz by what you are telling me.
The smaller your box is the longer the ports have to be to acomplish this. there will be a point where the box is so small and the port is so big it wont even fit in the box.
but the larger you build the box the louder and the deeper it will play and the shorter the port will be (so its easier to build as well)
You must leave at least 4 inches of space from the back of the port to the inside wall of the box.
Take some measurements and let me know. This thing would be SICK in an 11 cubic foot box (5.5 cubes each) and 3 flared ports each.
