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View Full Version : Just finished building my home subwoofers. Wicked!


contoursvt
Nov 30, 2008, 01:17 AM
18Hz baby! Anyway I'm very happy with the way they turned out. 10" Vifa woofers from about 12 years ago in just the right cabinet is giving me some very detailed, clean, deep and tight bass. Not boomy home theater type bass. Very nice bass that blends well with the main speakers.

Anyway I'm happy and want to share the results. If anyone wants to build their own or has questions, you can feel free to ask me. By the way,they are driven with a really cheap 125wpc amplifier by Nexxtech (also sold as Optimus, Pyle and Pyramid). Normally these brands are junk but surprisingly this amp had some good reviews online regarding its sound quality. Its really only 80wpc but bass is controlled and accurate. Cant ask more. Picked it up for $129 :) I have a dedicated electronic crossover at 47Hz.

http://powerthings.com/pics/newsubs_finished.jpg

Big-TDI-Guy
Nov 30, 2008, 01:30 AM
Nice job, bud! The fact you made it adds another 10db to your s/n ratio, lowers THD by .1% and gives you 10 more Wrms! At least, it always does when I do. ;)

My last enclosure (which is still going strong) I made last summer. Got sick of having no bass in my Golf, but I did NOT want a box b/c I NEED the hatch space. I saw a "stealth box" for my car - and once I saw the price tag (650 for the box - NO sub or amp included) I decided to get all home depot on things.

Scrap plywood, 3/8" threaded rod, some fender washers, wing nuts and some tape-backed foam stripping - and I've got one of the best setups I've ever heard. (I cut the plywood into 2 circles the same size as my spare, and bolted them through it - threw in a 12" sub - and it pounds. (accurate too) Best of all, I got my space AND a spare tire to boot. (pun intended)

Project7
Nov 30, 2008, 01:58 AM
Nice one!
I'm actually going to do this myself, got a pair sitting in the garage at the moment but have no idea where to start.

Did you know how to make them, or did you get a guide from somewhere? Because I believe the boxes have to be a certain size (depth/width etc).
I don't know how to find out what the dimensions need to be according to the subwoofers.

Any help will be appreciated, thanks.

They look good too ;)

Take care.

jmann
Nov 30, 2008, 02:14 AM
They look awesome! :)

contoursvt
Nov 30, 2008, 02:24 AM
Thanks for the comments guys :) I'm totally hyped and listening to all my music again. I cant believe some of the astonishingly deep bass in songs I had no idea had ANY bass. LOL

Project7, if you can, find the make and model of the woofers you have and I will contact you and give you some pointers :) Its fun to build your own. Also placement of speakers are critical as well. Even a great speaker can sound terrible if its not placed well - food for thought :)

bartelby
Nov 30, 2008, 02:27 AM
Thought they were a little on the large size until I remembered this (http://www.royaldevice.com/custom.htm#THE%20REAL%20TOTAL%20HORN).


See if you can spot the glaring error in the last photos...

TK B$K
Nov 30, 2008, 02:48 AM
goddd this really makes me want to bring my two 15's in from the back of my Escalade and put them right in front of my tv...... damnnn

Nice work!

dalvin200
Nov 30, 2008, 02:50 AM
wow.. look really nice!!

bit big for the size of room? (just going by the pic)..

lovin the donald duck btw :p

Project7
Nov 30, 2008, 04:53 AM
I have found a few guides online, but will take any input you have.
Ok, here goes.


Brand: Rockford Fosgate
Part name: 8" Punch WooferPart number: SP-88

Nominal diameter: 8.00 in (203.2 mm)
Magnet weight: 22.00 oz (624.8 g)
Frequency range: 40 - 4,200 Hz
Nominal impedence: 8Ω
DC resistance (RE): 7.3Ω
Resonance frequency (fs): 40 Hz
Mechanical Q factor (QMS): 2.28
Electrical Q factor (QES): 0.55
Total Q factor (QTS): 0.45
Effective cone area (SD): 34.10 in^2 (0.0220 m^2)
Equivalent air volume (VAS): 1.978 ft^3 (56.0 L)
Compliance (CMS): 0.00081 m/N
Moving mass (MMS): 0.67 oz (19.1 g)

Voice coil diameter: 2.00 in (50.8 mm)
Voice coil winding height: 0.55 in (14.0 mm)
Voice coil former material: 5 Mil Aluminium
Voice coil inductance: 0.85 mH

Force factor (BI): 7.9 Tm

Linear excursion (Xmax): 0.17 in (4.3 mm)
Sensitivity (SPL): 90 dB W/m
Operating power (PE): 100 W


Width: 8-5/32" (207.2 mm)
Depth: 3-19/32" (91.3 mm)


Hmm, probably a lot of unnecessary information, but there you go.

I plan to ask my woodwork teacher for some help with the wood, will tell you how I go.

Thanks,
Project7.

contoursvt
Nov 30, 2008, 01:40 PM
Hi Project7,

Hmmm looking at the specs of that speaker, I'd say it will be tough to do a proper subwoofer. Will it be used for home or for a car? Would you be more insterested in turning it up loud or do you listen to your music are a more mellow volume?

I'd actually recommend the following.

Buy one of these 10" woofers
http://www.parts-express.com/pe/showdetl.cfm?Partnumber=295-368

Place it in a 3 cubic foot enclosure and tune it to 25Hz. That would be approximately a 8" to 9" long 3" diameter port. I'd line the back, top, bottom and sides of the cabinet (inside) with some kind of sound dampening material. Fiberglass insulation works but there is a risk of fiberglass fibers getting into the woofers. Home depot should have specific material for sound dampening.

Oh and this amplifier looks to be great for the $$ :)
http://www.parts-express.com/pe/showdetl.cfm?Partnumber=300-802

That will give you the amp and crossover so you wont need seperates.

deorg
Dec 9, 2008, 09:14 PM
18Hz baby! Anyway I'm very happy with the way they turned out. 10" Vifa woofers from about 12 years ago in just the right cabinet is giving me some very detailed, clean, deep and tight bass. Not boomy home theater type bass. Very nice bass that blends well with the main speakers.

Anyway I'm happy and want to share the results. If anyone wants to build their own or has questions, you can feel free to ask me. By the way,they are driven with a really cheap 125wpc amplifier by Nexxtech (also sold as Optimus, Pyle and Pyramid). Normally these brands are junk but surprisingly this amp had some good reviews online regarding its sound quality. Its really only 80wpc but bass is controlled and accurate. Cant ask more. Picked it up for $129 :) I have a dedicated electronic crossover at 47Hz.

http://powerthings.com/pics/newsubs_finished.jpg


Love the setting, the painting its just perfect and it must sound amazing.....

descartes
Dec 9, 2008, 09:54 PM
nice work. they look great

ravenvii
Dec 9, 2008, 10:04 PM
Looks insane!

How much did you pay for them altogether?

dmw007
Dec 9, 2008, 10:27 PM
Very nice contoursvt! :)