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View Full Version : Help me build a home 15" sub, paypal :)



vario
12-01-2008, 03:40 PM
I just bought this sub: http://www.parts-express.com/pe/showdetl.cfm?Partnumber=295-470

t/s specs:
*Power handling: 250 watts RMS/350 watts max *VCdia: 2" *Le: 2.30 mH *Impedance: 4 ohms *Re: 3.1 ohms *Frequency range: 20-500 Hz *Fs: 20 Hz *SPL: 92 dB 2.83V/1m *Vas: 9.70 cu. ft. *Qms: 4.00 *Qes: .50 *Qts: .44 *Xmax: 8.5 mm *Dimensions: A: 15", B: 14", C: 6-3/8".

and this amp:http://www.parts-express.com/pe/showdetl.cfm?Partnumber=300-805

Bass Boost 6dB @ 30Hz
* High power/low distortion
* Adjustable low pass crossover
* High and low level inputs/outputs
* Auto On/Off
* Phase reversal switch
* Power output: 170 watts RMS @ 8 ohms 240 watts RMS @ 4 ohms
* S/N ratio: 90 dB (A-weighted)
* Dimensions: 9-13/16" W x 9-13/16" H x 5" D




I am thinking about building a vented box, but I am also considering sealed. Main things I am looking for are accuracy and sound quality. This is for my room, not my trunk. I am willing to paypal $5-10 if someone can give me a really nice plan. Should I go vented or sealed? I have already bought these parts so that is what I will be using. If I go vented, I would either go slot port or flared pvc.

Prefered size range is 2 cubic feet to 4 cubic feet, possibly larger if I like the design.

Material is birch plywood, not mdf. I don't like cutting mdf. I will reinforce of course.

Will a slot port give me the accuracy I need for home audio?

vario
12-01-2008, 03:42 PM
I would also like to add that for aesthetics i am thinking having the driver top, then the slot port below, front firing.

jdawg
12-01-2008, 03:54 PM
thats a nice sub but is it for music? movies? Thats would determine the tuning

vario
12-01-2008, 04:08 PM
I appreciate prompt reply. Music mostly (classic rock, some rap, metal) and a mixture of movies as well. Id like a tight, accurate, hard hitting response. You could bring a person in and they could say " **** that sounds good"

if it helps, I am running what could be called a stereo setup I guess. Two rear 2-way KLH Model 17's, two front technic sb-l71 3 way's in front and a sub(this one after its built :) ). The fronts and rears are bridged off two channels on my behringer ep1500 dj amplifier, 450 watts per channel at 4 ohm.

mlstrass
12-01-2008, 07:17 PM
check the DIY section on AVSforum and hometheatershack as there's a LOT of HT sub builds. Probably with the PE sub you have...

vario
12-01-2008, 07:22 PM
cant find any builds for this particular sub.

here is my wip, am I on the right track atleast?

http://i36.tinypic.com/2m67tyh.jpg

vario
12-01-2008, 07:34 PM
Port length is 107.71" long, how do I calculate that when i am making the mockup?

here is a photo of the mockup so far http://i36.tinypic.com/2uz6mpe.jpg

vario
12-01-2008, 09:07 PM
i gave up, $10 to anyone who makes me a good slot port, 4 cu ft

mobeious
12-01-2008, 09:10 PM
i can help ya out PM me

vario
12-01-2008, 09:12 PM
pm sent :)

bamaboy
12-01-2008, 09:13 PM
cant find any builds for this particular sub.

here is my wip, am I on the right track atleast?

http://i36.tinypic.com/2m67tyh.jpg

that response looks like garbage for movies :crap:

vario
12-01-2008, 09:28 PM
yeah thats why i gave up

IDSkoT
12-01-2008, 09:29 PM
I would also like to add that for aesthetics i am thinking having the driver top, then the slot port below, front firing.

Negative. If you're going for aesthetics, I say you have a down-firing sub, and have the space in between the legs covered in grill cloth.

That would look the best.
It would just look like a piece of furniture. As for the port, however, you can have port down, or aeroport facing anywhere, and paint the box a nice black.

IDSkoT
12-01-2008, 09:30 PM
that response looks like garbage for movies :crap:

Not really. It's just not as peaky.

116 dbs isn't too bad.

vario
12-01-2008, 09:31 PM
i dont want a downfiring sub, want driver to fire front i have wood floors and i run full sized vintage speakers so it would match my aesthetic lol

edit: forgot to mention, amp has bass boost 6db at 30 hz

SSS 18734
12-01-2008, 10:01 PM
If this is going to be a home theater sub, you're going to want better low-end extension.

vario
12-01-2008, 10:16 PM
90% music 10% home theater

jdawg
12-01-2008, 10:18 PM
then it wont do bad

vario
12-02-2008, 11:57 AM
Should be getting sub and amp today im so excited ill post some pictures lol

splferrell
12-02-2008, 02:26 PM
i will be doing the same sub but 18'' after x-mas, let me know what you think of this sub

vario
12-02-2008, 05:02 PM
i will be doing the same sub but 18'' after x-mas, let me know what you think of this sub

Its big. Makes my old 10's look wimpy. Small magnet, huge cone. Should make a lot of noise with not too much power. I don't know how well it will work for a car. Should be fine for my application.

mlstrass
12-02-2008, 08:19 PM
You might want to tune mid 20's if it's mostly for music as you'll get some decent room gain down low, especially if the sub is in a corner.

Port length seems insane, but all my HT subs are tuned in the teens with sonotube round port. Single 6" port should be plenty and would probably cut down on the length.

mlstrass
12-02-2008, 08:22 PM
4 cubes @ 25Hz with a single 6" port that's 26" long should be doable. Front firing sub and port out the top or bottom.

Or a 4" aeroport would only need to be 17.25" long for a 21Hz tune.

vario
12-02-2008, 10:07 PM
bump still need a good plan