SPL heavy-hitters and recognized box designers, come hither please

[jerryrobinson 10+ year member]

can i stop by and check out you and your buddys system ?? my set up is almost the same pm me or call 773-655-3405

 

[tommyk90 5,000+ posts]

wheres the best place to buy cheap aeros?

http://www.partsexpress.com

Search for the manufacturer "precision sound"

 

[iamamp3pimp 5,000+ posts]

i havent done any testing at all, and idk what i hit, so there

 

[AudioXtremes 10+ year member]

i along with double baffling, with kind of other supports work best. i have heard tie rod threading is a good choice. i had triple baffle on my last box, but i think it was a little unnecessary and added alot of weight.

Threaded rod. Dowels are ok. Big pieces of mdf bad.

I also have a 1990 dodge grand caravan. what is the best way to fire into these. sub up port back? sub back port back? sub up, port up? sub and port towards front of vehicle? sub back, port firing towards front? who has had some good numbers in any of these positions.

Sub up port back. Subs side by side width wise. Subs positioned on box as close to back door as possible. Trust me.

also, how much does fiberglass resign help, and if im going to do it, should i do whole box or jus corners?

Resin helps when you sand it smooth to lower air drag. Or to seal leaks. Not to strengthen. When used to strengthen in fart boxes it generally looses db because you made the box more rigid which lowers the resonance and isn't good when burping at 68hz.

45 degree corners, help at all or not?

Maybe, if there is a big problem with standing waves. I have generally found that they don't hurt and usually do it in daily boxes.

wud a port per woofer, in almost separate chambers be better than one big box with one port, for less cancellation, it it becomes a problem?

Common chamber. 3 6" aeros minimum. I would like to see 4.

I am looking to tune at 30 hertz.

Why? On a MT tuning below 34ish isn't going to gain much in the sub 30hz frequencys. Trust me.

Also, I am running MTs, who has had the best numbers at lower 30's freqs, and it what amount of cubic feet boxes were these MTs in. ive seen so many different sizes, looking to do research for volume now.

SPL 3cf each. Daily 8cf each.

Also, slot port to Aero ports, differences in both, and which one is better for higher numbers?

If you have the money do aeros.

also, rounded port corners everyone always suggests. I have been doing this on my last 7 boxes, but never really understood why except for better air flow, any other reasons?

Airflow

which is the best tightening solution when it comes to wood glue, i use liquid nails but am looking for something different, that may hold better.

Titebond III and screws.

also, i see SPL competitors dont use rubber gaskets around their subs, and some even go to the length of duct tape, im guessing to hold in air, anymore explanations. why dont some people use rubber gaskets?

The gaskets, while they look nice for daily, can leak. Bad. Not a perfect seal.

Next, which way is the best way to lay out subs in a box, although this may go hand in hand in positioning of subs.

Having subs length-wise in a vehicle such as you have laid it out doesn't work best. Keep subs away from large port openings and evenly spaced from them as well.

i was told by a knowledgeable competitor, to do a box, with a port across the bottom of the whole box, so no cancellation occurs as long as subs are side by side. im thinking bout this heavily, any other way to do it? is there any other way to manipulate air movement.

That works ok. But don't neglect the 9 to 1 rule. For every 9 inches of width you need 1 inch of height.

 

[pioneerpimp 5,000+ posts]

****, that was a lot of well informed answers. so 3cf a piece for SPL? and daily is 8? what if i wanted to do 6 a piece? that would be ok as well, right? and how do you figure out how many aeros you need and the length of each one as well. and waht is the difference in 3 long aeros and 4 shorter ones that equals the same length as the 3" longer ones? i am thinking about tuning higher now also.

 

[pioneerpimp 5,000+ posts]

i havent done any testing at all, and idk what i hit, so there

ok

 

[AudioXtremes 10+ year member]

****, that was a lot of well informed answers. so 3cf a piece for SPL? and daily is 8? what if i wanted to do 6 a piece? that would be ok as well, right? and how do you figure out how many aeros you need and the length of each one as well. and waht is the difference in 3 long aeros and 4 shorter ones that equals the same length as the 3" longer ones? i am thinking about tuning higher now also.

down to 5cf is ok for daily. But you might want to tune a little lower. Say 32hz.

As for sizing aeros I like a 1/4 of the surface area.

18" sub figure 17" cone and 2 subs.

17/2=8.5

8.5x8.5x3.14=226.87x2subs=453.74

453.74/4=113.44sq inches of needed surface area.

6" aero is 28.26sq inches

113.44/28.26=4.02

So 4 6" aeros is best.

 

[pioneerpimp 5,000+ posts]

what is all that **** calculation? any easier way to put it? so if tuning between 35-40 hertz, how many cubes should be good for daily? 6.5 or so?

 

[pioneerpimp 5,000+ posts]

justin, did u do any shipping today?

 

[AudioXtremes 10+ year member]

How much power are you running. Also, forget the calculations. Just try and run four 6" aeros. matter of fact give me your dimentions and I'll work it up.

 

[pioneerpimp 5,000+ posts]

around 6k to each, for comps, but 3.5k for daily a piece. dimensions i do not know yet as i am trying to figure out how to build a nice box.

 

[AudioXtremes 10+ year member]

I meant max dimentions and I'll work up the box.

 

[pioneerpimp 5,000+ posts]

44 long by 32 deep by 22 high

 

[pioneerpimp 5,000+ posts]

so whats up audioextremes? any anybody have any aeros for sale? 6" ones?

 

[matrxx dude 5,000+ posts]

44 long by 32 deep by 22 high

thats the same outer dimesions as my box