Joe X
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Posts posted by Joe X
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right on, is 1 cu ft each for 2 alpine type r 10's tuned to 31 hz a good place to start as far as box goes for that car? These are the subs available to me at the moment.
1.2-1.5 cubes per sub. 33Hz at least I'd say.
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6 in would be ok, and yes net internal volume maximizes the way is drawn right now. You just need to figure out a seal off plan, will your back seats fold down?
OK, i figured that would be the reason for the front subs.. And Yes my seats will fold down.. Is there a way you could provide me a cut out sheet for the design you gave me?
I will consider some improvements, check calculations and then provide you a cutsheet by tomorrow.
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Can you go a little deeper or wider, guessing this is a trunk car.
I could go 6" wider but I would like to keep my current dimensions instead of having to buy all new wood
Here is a suggestion, took the 6" wide and 1" deep to reach the spec, hope you can fit that:
Enclosure Specifications:
Fb = 36 Hz
Vb = 2.5 ft^3
External Height = 13.5 in
External Width = 36 in
External Depth = 17 in
Port Width = 3 1/2 in
Cut Sheet List:
* All Dimensions in Inches.
* Wood Thickness is 3/4 for all Parts.
External Enclosure Parts:
2 x Front & Back (3 parts) = 36 x 13 1/2
Left & Right Sides = 14 3/4 x 12
Top & Bottom = 36 x 14 3/4
L Port Internal Assembly Parts:
Front to Back = 11 1/4 x 12
Extension = 10 13/16 x 12
Assembly guide (generic dimensions):
Let me know any questions.
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Draw your box, does the port fire sideways?
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how much would i be looking at for a TC coil for it? im kinda bummed now that it seems this thing wont perform like it should. and 3.5 cu ft net im assuming?
Gross volume is meaningless figure for spec use, a brand new LMS-R 15" sub is $433.
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Can you go a little deeper or wider, guessing this is a trunk car.
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You just don't have the space for 4 15s
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6 in would be ok, and yes net internal volume maximizes the way is drawn right now. You just need to figure out a seal off plan, will your back seats fold down?
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Break in period varies among subs but usually 200 Hrs (effective) at around 2/3 of xmax will loosen things out enough to make a t/s reading.
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If you are getting a custom built sub specs are anyone's guess, it needs to be broken in and then measure t/s params, or take a guess, if that's the exact unit you are getting you should ask the guy to tell the specs they gave him. They took off the LMS coil so it won't perform linear as the original 4000 hope that's what you are wanting.
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No it does not have to be pushed against the seat at all in fact some airspace in front of the sub is beneficial, the idea of sealing off is that gets done air tight so you pressurize a smaller volume. There a number of improvements that can be done but you need to carefully consider your space and then it gets modified to a final spec.
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Here is another suggestion it achieves about 7.8 cubic feet @ 33Hz and two subs fully front firing:
Some improvements pending.
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Ive decided to go solo 15" for my build, which will allow me ALOT of box volume for it (between 5-6 cuft max). i was wondering if anybody has had any experience with this brand and what box this sub might like to see? Ive been thinking between 4-4.5 cu ft, but i wanted to see what you guys would recommend me to try and measure for? Ill be using about 2k-2.5k watts. thanks
Seriously off:
http://web.archive.org/web/20061112053902/www.tcsounds.com/lms4000.htm
Would need to model to see how smaller it can be done
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no man and hell i only payed 150 for them alpines i work at a gas station far from rich my latest sub was a m.a. audio 15 but it was doa bad spider
back to the original ? is a rd alpha 15 worth $400
Well I would recommend any number of other subs over that and more so at $400, your new box seems a faulty design and if you have a trunk car you should only use a 15" sub if it can fit vertically installed (to fire frontwards or backwards) for efficiency and to avoid the trunk lid rattling. Lastly I wouldn't find any fun in seeing my hard earned stuff blow up but I guess each to his own....
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box might have been a lil small im kinda new at the high level stuff i was basically a dumb ass and wired it wrong on one then i woofer cooked the other lol.. this sub will be setup right
im am going threw a shop now cool guy i think http://www.ahoaudio.com/ is who im using hes been blowing up with business lately
i have a new box right now about 5 cubes 2 3in pvc ports 32x28x12 my entire trunk lol
btw i had two 12's @ first now im going to one 15
no pics yet i need to do a build log
Sounds to me like you have fun blowing up stuff.. guess you are rich.
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ok so ive been threw some subs lately and im getting another my ? is a rd alpha 15 worth $400 or should i be getting something else
A list of the subs you have used, and why you didn't keep the would be interesting. And a description of your system.
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okay so i did the precision port calculator, and for a 6 inch port it would be around 12.5 inches for 34hz. is that enough? i want the most efficency i can get.
Is way below the port area necessary for optimum efficiency.
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Okay so i have 2 sa 12s on the way and a brz1700amp, i am trying to design a box for my audi a4 that will be sealed off from the trunk into the cabin, i have never done this before and i am still learning about box rise, to combat box rise i would like to do an 8 inch areo port, as well as 45s and fiber resin. the space i have to work with is 35" wide, 17" tall, and 20 inches deep. i am aiming for about 4.2 cubic feet ( is that enough?) and around 35hz tuning. i just need a kick in the right direction!
The 8" port would need to be about 21" for a 35Hz so it would need to be firing sideways.
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Do it 2 1/2" - 3" wide.
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is that 2 pieces of wood on the top?
Overkill if you wish but yes, the cutlist shows that also.
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Ok so here is a suggestion:
Enclosure Specifications:
Fb = 34 Hz
Vb = 4 ft^3
External Height = 22 in
External Width = 36.5 in
External Depth = 15 in
Port Width = 4 1/4 in
Cut Sheet List:
* All Dimensions in Inches.
* Wood Thickness is 3/4 for all Parts.
External Enclosure Parts:
2 x Top & Bottom (3 parts) = 36 1/2 x 15
Left & Right Sides = 13 1/2 x 19 3/4
Front & Back = 36 1/2 x 19 3/4
L Port Internal Assembly Parts:
Top to Bottom = 15 1/2 x 13 1/2
Extension = 3 x 13 1/2
Assembly guide (generic dimensions):
Let me know any questions.
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Ok are you removing the backseats?
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will someone make me a good box design for 2 sa-12s, i gonna hook it up on a Rockford fosgate r.750.1 (934 watts rms) i no thats small but gonna have to do for now.need any more info let me no
Ok what's your vehicle, type of music you listen and the maximum dims for the box (height, width, depth).
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Well, I did round the corner a bit, just not a 45. It's not going to affect the performance without that 45 in the corner?
If you have not rounded the corner and not done the 45 in the port turn, never mind it will work regardless.
You are ok.. don't worry.
New enclosure, need help
in Subwoofers / Enclosures
Posted · Edited by Joe X
Your port area is off and your net volume high, for your vehicle I would suggest the following if you can fit the small increase in external dimensions:
Enclosure Specifications:
Fb = 35 Hz
Vb = 2.24 ft^3
External Height = 17 in
External Width = 26 in
External Depth = 15 in
Port Width = 2 in
Cut Sheet List:
* All Dimensions in Inches.
* Wood Thickness is 3/4 for all Parts.
External Enclosure Parts:
Top & Bottom = 26 x 15
Left & Right Sides = 13 1/2 x 15 1/2
2x Front = 12 x 15 1/2
Back = 26 x 15 1/2
Shared Port Internal Assembly Parts:
2 x Front to Back = 12 1/2 x 15 1/2
2 x Extension = 9 1/4 x 15 1/2
Let me know any questions.