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Can I get some advice on subs


Shouldn't I try to match the RMS as closely together as I can?
yes


And again i ask, would a homemade box be better than a pre enclosed?

good premade boxes or custom boxes made from 3/4 inch MDF are ok. but there normally not the right size/ shape you need. making them your self is easy. just gotta do the math.

http://www.the12volt.com/caraudio/boxcalcs.asp

^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
a good clicky to get you started seeing how much space it would take up in relation to your truck
 
Sundown Audio is fixing to release (should be shipping in the next couple weeks) there new 8 inch sub.....the SA-8. Presale is around 100 i think. SUPER nice subs triple stack motor and a 12 spoke basket that handles 400 rms. i think this would be PERFECT for your purpose.
 
yes




good premade boxes or custom boxes made from 3/4 inch MDF are ok. but there normally not the right size/ shape you need. making them your self is easy. just gotta do the math.

http://www.the12volt.com/caraudio/boxcalcs.asp

^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
a good clicky to get you started seeing how much space it would take up in relation to your truck


Well, if i make it myself i would want it to be perfect, I would have no excuse for poor bass.

Are there any secrets to making it, or do i just use the special wood (what wood exactly?), some silicon glue, and some screws? If I'm making it myself I'd be happy to buy the best materials, so I'll take all advice you can offer to make the best sub encloser ever, lol :icon_cheers:
 
3/4 inch MDF or birch. Use titebond 2 or 3 woodglue. Get a countersunk bit for the screws and regular deck screws are fine.
 
3/4 inch MDF or birch. Use titebond 2 or 3 woodglue. Get a countersunk bit for the screws and regular deck screws are fine.

+1 to everything but birch. anything with wood grain can crack and you start to beat on it. the grain of the wood will start to split down the natural seams..used 3/4 mdf unless your getting into the 15+ range then you want go wiht 1'' or 5/4.
 
go with a 10in kicker cvr,they are around $80-$100 thats what i have in mine, i only have a 300watt amp but i have a really big box and switched to bucket seats. my box is behind the passenger seat though and its scooted up pretty far....with bass you want to create as much air space as possible. mine isn't the loudest you will ever hear but it sounds good and you'll hear me before you see me for sure.
 
+1 to everything but birch. anything with wood grain can crack and you start to beat on it. the grain of the wood will start to split down the natural seams..used 3/4 mdf unless your getting into the 15+ range then you want go wiht 1'' or 5/4.

Birch is stronger than MDF when using only 1 layer FYI. and its a TON lighter. But for his application 3/4 inch MDF would be great. But if you get a nice higher end (companies such as RE, DD, Fi, AQ, Sundown, DC) 8" or 10" youll be SUPER pleased.
 
you want to use the required air space need per the specs of the sub

I'm almost leaning to a good 12 now, ve been researching like crazy lol. The only thing, do you think a 12 will overpower my speakers, I pretty much want a good balance. I also really want to match up the RMS and I have found a few subs which match pretty good...

So, if you think these wouldn't overpower my ride which would you pick:

Polk Audio MM1240
power range: 100-425 watts RMS
peak power handling: 850 watts
frequency response: 22-200 Hz
sensitivity: 92 dB

Boston Acoustics G212-4
power range: 75-300 watts RMS
frequency response: 20-350 Hz
sensitivity: 89.6 dB

Infinity Kappa 120.9w
requency response: 23-400 Hz
power range: 50-350 watts RMS (1,400 watts peak power)
sensitivity: 91 dB

Or would you add another? This question goes out to all! :icon_idea:



Just for the heck of it my favorite 10s so far are:

JL Audio 10W3v3-2
power range: 100-500 watts RMS
peak power handling: 1000 watts
frequency response: 25-250 Hz
sensitivity: 85.37 dB

Infinity 100.9w
requency response: 25-400 Hz
power range: 50-350 watts RMS (1,400 watts peak power)
sensitivity: 89 dB

Kicker Solo-Baric L5 Series 08S12L54
power range: 50-600 watts RMS (300 watts per voice coil)
peak power: 1,200 watts
frequency response: 20-100 Hz
sensitivity: 86.9 dB
 
and now for my longest post ever lol

But if you get a nice higher end (companies such as RE, DD, Fi, AQ, Sundown, DC)

maybe a lil to deep for the pockets of a noob lol:icon_surprised:

So, if you think these wouldn't overpower my ride which would you pick:

there all good and prolly the infinity. and do you know that polk is a marine sub???? i wouldnt plan on making use of that feature.

Birch is stronger than MDF when using only 1 layer FYI. and its a TON lighter.

some handy reading

The following properties are all based on 18mm sheet materials:

Birch faced ply:-
Eb = 2700 N/mm^2 perpendicular to grain
4600 N/mm^2 parallel to grain
Density = 11.6 kg/m^2

Birch ply:-
Eb = 3400 N/mm^2 perpendicular to grain
4600 N/mm^2 parallel to grain
Density = 12.4 kg/m^2

MDF:-
Eb = 2200 N/mm^2
Density = 10.8 kg/m^2

It can be seen from the above, that the plywood properties are directional depending on the orientation of the grain. For the purposes of this analysis, we can assume the stiffest properties as sub box panels are generally supported on all four edges. MDF is a homgeneous material and the mechanical properties are identical in any direction.

Comparing the Eb values given above it can be seen that the birch based plywood is over twice as stiff as the MDF. Therefore, if two identically sized sub boxes were fabricated, one from 18mm MDF and the other from 18mm birch ply, the MDF box would flex twice as much as the birch ply box.

That’s quite an improvement from simply using a different material for your enclosure.

Thickness vs. Material stiffness:-

Birch ply is expensive and MDF is relatively cheap.

It’s often asked, ‘Do I use 18mm Birch ply or 25mm MDF for my new sub box?’

As discussed above, birch ply is a stiffer material than MDF. It’s just over twice as stiff. However, the thickness of the material has a far greater effect on the overall stiffness than the actual material stiffness.

Example:-

It is common to ‘double up’ on the baffle thickness of a sub box from 18mm to 36mm.

You’d imagine that by doubling the thickness, you’d double the stiffness and effectively half the flex of the baffle. However, this couldn’t be further from the truth…

By doubling the thickness from 18mm to 36mm you in fact increase the stiffness by a factor of 8. The 36mm baffle will be 8 times stiffer than the single 18mm baffle.

This is derived from the second moment of area of the section given by Ixx = (bd^3)/12

Where d is the depth, or thickness in this example. The thickness value is cubed to arrive at the section stiffness.

For the full increase in stiffness to be exploited, the baffles should be glued together so the two layers act together in unison under load.

A double 18mm baffle is 8 times stiffer than a single 18mm baffle.

A triple 18mm baffle is 27 times stiffer than a single 18mm baffle.

A quadruple 18mm baffle is 64 times stiffer than a single 18mm baffle.

And so on….

By simply increasing the thickness of the material the stiffness overall is increased dramatically. Remember that birch ply is twice as stiff as MDF. H

In this case, the increased thickness of the 25mm MDF will far outweigh the increased material stiffness of the 18mm birch ply. The panels of the 25mm MDF box will be 28% stiffer overall than the 18mm birch ply box.

In general, the thickness of the material is king to minimise flex. The thickness will increase the stiffness far more than a stiffer material would. However, by doubling the thickness you also double the weight of the box.

For ultimate performance, the stiffer birch material should be used in multiple layers. You will then get the best of both worlds. But it is worth keeping in mind that double the layers of material and the weight of the box will also double.

does your brain hurt yet lol
 
Cool well I'm leaning towards the Infinity too, I found one new on ebay for $150 including the shipping. The price is a bit higher than i was planning on spending but I think I'd be willing to take the dive.

Any advice as to how i should construct the box, I think I'll use MDF... lmao, but other than that?

Does it make a difference what my design is, I think im going to go with something like this design.

wedwdh2_.gif


The recommended cubic inches for that infinity is 1 cubic foot, should i aim to get as close to this number as i can or is it fine to go over?

Oh and one more thing, where is the best place to get the MDF? Is lowes alright?

I probably wont buy it for a week or two so if anyone else has any last wishes/advice speak now or forever hold your peace.
 
The recommended cubic inches for that infinity is 1 cubic foot, should i aim to get as close to this number as i can or is it fine to go over?

Oh and one more thing, where is the best place to get the MDF? Is lowes alright?

I probably wont buy it for a week or two so if anyone else has any last wishes/advice speak now or forever hold your peace.

just get close the closer the better, dont forget to add room for driver displacment. lowes is cool but a few quick phone call could save a few bucks.

and if thats the shape you want you can most likely get one like that from an audio store. for like 50 bucks and its all ready carpeted. just fyi. thats a power wedge or truck box, just turned on its side.

good luck:icon_thumby:
 
just get close the closer the better, dont forget to add room for driver displacment. lowes is cool but a few quick phone call could save a few bucks.

and if thats the shape you want you can most likely get one like that from an audio store. for like 50 bucks and its all ready carpeted. just fyi. thats a power wedge or truck box, just turned on its side.

good luck:icon_thumby:

Oh lol, will one of those 50 dollar boxes be good enough, because hell, i'd definitely take the short cut if you think they would be, i dont have much time and as long as the box delivers.

Thanks for all your help and I'll make sure i get some pics up evetually, after I wreck havoc on my truck. :D
 

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