[Size vs quantity help]

we don't know. you'd have to build it and find out for yourself. perfect world, the most cone area in the closest to ideal box out of those two options would "flex the roof better".

OK so that would be the 8" then if I go by cone area 150inches at 1800W rms.

12" sub is like 113inches at 1500W rms.

[Size vs quantity help]

OK I think I'm now officially torn between one havoc 12 or 3 sa-8's, after correct porting both boxes would have near 2 ft^3 of air with 6" or 7" diameter porting tuned 30-35hz (35hz for the 8" subs). 8s would be forward facing and the 12 would be down firing with about 1.5 inch off the carpet. What would flex the roof better?

[Size vs quantity help]

Hm you guys gave me lots to think about. Sounds like all of these setups could be adjusted for low volume SQ but it seems I become more concerned about spl. I'm not necessarily concerned about wattage efficiency or dollar efficiency as much as SPL to air space efficiency.

So maybe if I make a more specific question. If I were to focus on 35hz SPL, still with 2.5 ft^3 and a ported enclosure with proper porting. Should I shoot for a down firing sa-10" or sa-12. Or 2 x8 subs or 3 sa-8 subs (I'm assuming 3 sa-8 will be louder than 4 if I get the porting and airspace correct so I am abandoning the 4 sa-8 config if that is correct).

I'm open to other brands, I'm just naming sundown sub's because its where I did most of my reading. (8 inch sub's have no depth restrictions but 10's or 12's need to be in the ball park of 6" mounting depth and magnet profile starts to matter)

So far someone suggested ascension audio havoc subs, I think the 10 could fit but I haven't had a chance to go through the specs yet and fit it to my model to check clearances.

Edit: just looked up specs on more subs

I checked out most of the sub's on SSA and I'm thinking I could fit one of the following with proper space and porting.

I could fit ascendant audio's havoc 10 or possibly 12.

I could also possibly fit an icon 12 or 10

And also an xcon 10.

A DC lvl 4 10 is also possible.

Sundown sa 10 is possible.

[Size vs quantity help]

I just checked the link. It calculated I need an 8 inch port at 49 inches length. That's 1.5 ft^3 of my 2.5 available volume!!! How do I get around this?

[Size vs quantity help]

No prob.

When you are working on your design, make sure you use enough port area. It can be tricky to do with these smaller boxes. For a SA-8 on 750 watts I'd use no less than 15 sq in per sub.

O I was going by diysubwoofers.org and I though I wanted a 3 inch diameter port about 14 cm long if I recall correctly.

15 sq in per sub could be like having 4 separate 4" diameter ports or one 8" diameter port then, which is also doable. I like the aeroport idea because it will take less volume than a slot port. 15sqin per sub sounds excessive to me though, but if you are certain it will work I'll go for it.

[Size vs quantity help]

I've built quite a few enclosures out of 1/2" material, it works fine as long as you approach it correctly.

Good to know it can be done, I'll try to source some real Baltic birch and add bracing to the design, if it works well I may have a well drafted set of plans to share when I'm done

[Size vs quantity help]

Since this is going under the seat of a pickup that makes it a tougher choice. If you are going to be using a DSP, I'd be inclined to go with the four SA-8s. You can use the DSP to fix their biggest drawback, which is peaky response. An alternative would be to use a couple higher power handling 10"s. A pair of FI SSD 10's would work well too, but then they would have to be down firing, which complicates things.

I'll check out the fi ssd 10" subs maybe that could work too.

One more question. How bad would it be to go with 1/2 inch MDF instead of 3/4. I'm not being cheap it really has to do with available volume, 3/4 inch MDF requires me to lift the rear seat 2.5 inches where I can get away with a 2 inch lift with 1/2 inch mdf.

[Size vs quantity help]

Single Havoc 12 ported

I like the specs but I didn't see a mounting depth on the online store, I'll have to search from a PC I think. I also saw the mayhem, a 2500 watt 12 inch sub but I doubt I could make it fit. Would be sick though.

Would The havoc really destroy 4 sa8's? But the cone area of 4 8" is greater than a single 12. Too bad I can't borrow subs, boxes only cost one sheet of MDF for testing.

[Size vs quantity help]

Big question, how much power are you going to run? That is going to greatly affect what subs you should pick and how flat of response you can achieve.

I'm planning on buying a sundown amp to match subs, but due to electrical requirements I'm thinking of not passing 3000 watts RMS.

I just drew up my box a 3d model and calculated volume after MDF material displacement and I have about 2.5 ft^3. If I made the box more complicated to fit around seat brackets in my crew cab I can claim up to 3ft^3 after material displacement.

If I go with anything bigger than 8" sub then it becomes down facing instead of forward facing and mounting depth becomes important. If it is less than 6" depth it works, and works with 2.5 to 3 ft^3 of air. Its basically a custom truck box in a 2016 silverado crew cab with a rear seat lift of 2 or 3 inches, preferably only 2 inch seat lift.

Ported I can do 4 8" subs of any kind (assuming I have enough box volume)

Or I can do 2 10" subs or 1 12" sub.

Sealed I can still only do 4 8" subs and 2 10" subs, but possibly 2 12" subs if they are less than 7" depth and magnet isn't too wide.

What say you triticum? I was thinking 4 8" sa's would blow away a single 12 or 2 tens if I can handle the power demands.

And also I will be going full active with a DSP, I'm thinking audison bit one, so it is feasable to eq them flat for quality on one setting and then set it to dubstep dirty on another pre set.

[Size vs quantity help]

It depends on how peaky the box is too I guess. A big ported box will have a lot of peak and a smaller ported box will tend to be flatter.

I wonder of experimenting with polyfill could lower volume and flatten the peaks if I start towards the larger side of things. Or possibly shortening the port to raise tuning frequency might help the subs.

I did talk to sundown today and the said the x8 subs give mor punch and better range and would do what I'm looking for. The sa would be smoother at lower freq though. But the x subs need more airspace so I couldn't do 4 of them and sundown did say 4 sa8 are louder than 2 x8 subs. Sundown also sold said I would be happier with 8" than 10" or 12" for what I'm after. I forgot to ask about 6.5" though, but I bet 4 of the x6.5 would shame 4 sa8. I'm not sure I'm ready to do 6k watts though lol.

I think I'm gonna go with the sa 8

[Size vs quantity help]

Thanks for the info guys,

Generally if I tune my box to 35 how high do you think it would play?

How high would a sealed box play?

Sub's in question are the sa8

Jl audio offers a stealth box with two 10tw3 sub's and its ported. It has sound characteristics I like, but I'm not sure what frequency its tuned to. I'm hoping to cover the same range but louder

[Size vs quantity help]

Hi I have the space to put one ported sa 12, two 10" or 4 8" sa sub's. I could do 2 12's sealed or even two 10" sub's sealed.

My goal is to have a system with punch and quality for listening to rock, but can also crank the level up and get some good SPL around 35 hz give or take a few hz.

Its kind of dual purpose in that the rest of my system will be built full active and sq orientated.

I'm leaning towards 4 ported sa 8" tuned to 35 hz in a 2.5 ft^3 enclosure.

It needs to bang red hot chilli peppers up high and dubstep down low around 30 or 35 hz.

I also considered 2 boxes tuned different, each with 2 sa8". Maybe tuned 35 and 40 with separate channels?

I'm hoping for more SPL than my old 2 12 kicker l7 setup, without sacrificing the minimal sq it had.