My subwoofer :D

The Brick

The Brick

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It's been a long project (mainly due to long times of doing nothing), but I finally finished it today. :D


20070207202635aaja6.jpg



Passive subwoofer (no internal amplifier)
10" Peerless XLS-10 8 ohm + XLS-10 passive radiator (600g)
30 liter enclosure
22mm MDF wood
Freq response: 18 - 200Hz
20Hz @ 100dB @ 120W
Total costs: 365,50 eur, wich is almost 100 eur less than my budget :D
mom pissed off upstairs-time: 18.2s
carpet finish

edit- High quality, high performance HOME THEATER subwoofer.

I must say I'm quite proud. :D
 
mine...they may be small, but they're plenty of boom...
seats down:
img1631px2.jpg


seats up:
img1632fo3.jpg
 
Mythbusters made a 52" one. From metal. Powered by a diesel engine. That is hardcore.


Anyway, car subwoofers are a world apart from home theatre subwoofers.


edit - also, it's not as lightgrey as it looks on the pic. It's the cameraflash making it so light. It normally looks as dark as the cone.
 
and them ya will put da spoiler and da bling blbing spining rims, eye burner green and lot of stickers yo!

and dont forget da fart can that make it go 300hp yo!
 
The Brick said:
It's been a long project (mainly due to long times of doing nothing), but I finally finished it today. :D

Passive subwoofer (no internal amplifier)
10" Peerless XLS-10 8 ohm + XLS-10 passive radiator (600g)
30 liter enclosure
22mm MDF wood
Freq response: 18 - 200Hz
20Hz @ 100dB @ 120W
Total costs: 365,50 eur, wich is almost 100 eur less than my budget :D
mom pissed off upstairs-time: 18.2s
carpet finish

I must say I'm quite proud. :D
Click to expand...

Nice work, looks to have very sound construction. :thumbs: I'm guessing its sealed since I don't see ports in any of the usual places? ... unless they're on the back... Anyways, it looks professional :D
 
Nope it's a passive radiator box. One speaker has a voice coil, and the other is moved by the airpressure caused by the active speaker. Practically it serves the same purpose as a bass port but it's perfectly tuned.
 
The Brick said:
Nope it's a passive radiator box. One speaker has a voice coil, and the other is moved by the airpressure caused by the active speaker. Practically it serves the same purpose as a bass port but it's perfectly tuned.
Click to expand...

That's interesting, I don't think I've ever heard of that before. But if one speaker is moved by the air pressure caused by the other, wouldn't they be moving out of phase?
 
Only an idiot thinks a bigger sub speaker is better. 12" is probably the upper limit on size. Anything over this, and the cone can't travel fast enough to keep up with the frequency - so it just distorts itself. Having 2 or 4 10" speakers is the ideal scenario. The same amount of air is shaken, but there's no distortion.
 
Sweeeeet is it part of your PC speaker setup?
Pics of final setup!11
 
lePobz said:
Anything over this, and the cone can't travel fast enough to keep up with the frequency
Click to expand...

That doesn't make any sense.... if the cone couldn't travel fast enough, it wouldn't be making the frequency to begin with. That's what frequency response is all about.

Larger woofers are practical in larger sound applications, like live sound. 15/18/+ inch woofers are used all the time in sub enclosures for live sound. When I used to play bass, I had 2 enclosures - a 4x10 cab and a 1x18 cab. The 4x10 was usually more than enough, but at bigger venues i'd use both of them because the 1x18 filled out the lower end better with larger crowds and bigger rooms.
 
DreamThrall said:
That's interesting, I don't think I've ever heard of that before. But if one speaker is moved by the air pressure caused by the other, wouldn't they be moving out of phase?
Click to expand...

Yeah basically, but it's not like they are perfectly out of phase. I and my dad (audio technician) tested it thoroughly. Here's the fase pattern.


fasesubyr4.png



The solid line from the top right is the active speaker, the ------ line is the passive speaker, and the third line is the phase. As you can see it's not that dramatic.
 
I mean the required frequency of the music / sound that is being played. It's what happens when your sub distorts. Smaller speakers are better for faster paced music. If you want good deep slow bass for RnB then 12"ers are the best.
 
lePobz said:
I mean the required frequency of the music / sound that is being played. It's what happens when your sub distorts. Smaller speakers are better for faster paced music. If you want good deep slow bass for RnB then 12"ers are the best.
Click to expand...

Ah, I see what you're saying. Yes, it gets muddy... just the way you explained it at first sounded funny. Though, I'm not sure there's really that much of a difference between 10" and 12".

The Brick said:
Yeah basically, but it's not like they are perfectly out of phase. I and my dad (audio technician) tested it thoroughly. Here's the fase pattern.

[snip]

The solid line from the top right is the active speaker, the ------ line is the passive speaker, and the third line is the phase. As you can see it's not that dramatic.
Click to expand...

Cool. I'm guessing its due to air compression? I didn't even think of it at first because I was just thinking of basic displacement, but I guess it would make sense.
 
DreamThrall said:
That doesn't make any sense.... if the cone couldn't travel fast enough, it wouldn't be making the frequency to begin with. That's what frequency response is all about.

Larger woofers are practical in larger sound applications, like live sound. 15/18/+ inch woofers are used all the time in sub enclosures for live sound. When I used to play bass, I had 2 enclosures - a 4x10 cab and a 1x18 cab. The 4x10 was usually more than enough, but at bigger venues i'd use both of them because the 1x18 filled out the lower end better with larger crowds and bigger rooms.
Click to expand...

This is not a PA speaker. You try to make a good square or triangle wave with an 18" speaker... Doesn't work (easily).
 
The Brick said:
This is not a PA speaker. You try to make a good square or triangle wave with an 18" speaker... Doesn't work (easily).
Click to expand...

Yeah I know... was just saying that larger speakers aren't completely impractical.
 
DreamThrall said:
Ah, I see what you're saying. Yes, it gets muddy... just the way you explained it at first sounded funny. Though, I'm not sure there's really that much of a difference between 10" and 12".
Click to expand...
Yeah i'm crap at describing stuff. I just think it's funny when chavs spend loads on huge subs then wonder why they sound crap. I'm doing a custom boot build in my vectra when i've got enough money... and it's a big boot :D
 
lePobz said:
Yeah i'm crap at describing stuff. I just think it's funny when chavs spend loads on huge subs then wonder why they sound crap. I'm doing a custom boot build in my vectra when i've got enough money... and it's a big boot :D
Click to expand...

Don't you mean TRUNK? ;)
 
Nope I said home theater in the first post.


edit: uhh nope lol. my second post.

edit2: now I have
 
lePobz said:
Yeah i'm crap at describing stuff. I just think it's funny when chavs spend loads on huge subs then wonder why they sound crap. I'm doing a custom boot build in my vectra when i've got enough money... and it's a big boot :D
Click to expand...

Hahaha sorry but that made me laugh.

You have a Vectra - sorry but that = chav
 
Its a boy racer car. Therefore, chav ride :D

Proof. PROOF!!

vectra_front_spoiler.jpg


*cackles, then cries as he looks at his useless piece of **it out the window*
 
What the hell are you doing with a Oscilloscope, a waveform Generator and maybe even a spectrum analyser?? You don't need that to build a Subwoofer!! That's some Hardcore shit!! :p

Hope it sounds to your standards.
 
That's all my dad's. I just used the desk (oh yeah and the tone generator to screw around), which is right here in my room when I look to the left. :D
 
What material is the cone made from, and does the interior use a transmission tunnel to delay the pressure waves from the main cone to the secondary cone?
 
lePobz said:
Only an idiot thinks a bigger sub speaker is better. 12" is probably the upper limit on size. Anything over this, and the cone can't travel fast enough to keep up with the frequency - so it just distorts itself. Having 2 or 4 10" speakers is the ideal scenario. The same amount of air is shaken, but there's no distortion.
Click to expand...

Silly person. You clearly know very little about acoustics.
 
That middle panel might be stronger with some bracing at the front (presuming you've not already done that), but other than that well done :)
 
? I don't see what you mean. The middle panel is also glued to the front panel.






And cheers ;)
 
The middle panel will flex slightly due to the pressure differential between the two halves of the cabinet. Bracing it should reduce that flex, and improve the linearity of your response chart.
 
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