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Would this work?

 

New member
Username: Maximum_boost

Columbia Heights, MN USA

Post Number: 1
Registered: Mar-10
I'm trying to buy two 18" subs for my room. Could I buy 2 car subs and put them in an enclosure?
 

Gold Member
Username: Jrbay

Livonia [Detroit area], Michigan USA

Post Number: 1159
Registered: Feb-08
Sure but you would need plate amps to drive them and would have to seriously ask yourself why that would be better than buying subwoofers from a reputable manufacturer.
 

New member
Username: Maximum_boost

Columbia Heights, MN USA

Post Number: 2
Registered: Mar-10
I'm just trying to be cheap.
 

Gold Member
Username: Jrbay

Livonia [Detroit area], Michigan USA

Post Number: 1160
Registered: Feb-08
Cheap doesn't sound good!!! Smart can, for sure!!! Why two subwoofers?
 

New member
Username: Maximum_boost

Columbia Heights, MN USA

Post Number: 3
Registered: Mar-10
Cause this is for a stereo, not a theater system. That's why I want 2. Unless there is a way to make stereo to mono?
 

Gold Member
Username: Jrbay

Livonia [Detroit area], Michigan USA

Post Number: 1161
Registered: Feb-08
If you look at a plate amp like this one:

http://www.parts-express.com/pe/showdetl.cfm?Partnumber=300-804

It has binding posts for speaker level ins and outs. You wire the left and right out of the amp to the sub then back out to the left and right speakers. In other words if you are on a budget then you only need one sub.

I would also downgrade your speaker size because an 18" sub just can't sound good, but I suspect that you are shooting for quantity WAY over quality.
 

New member
Username: Maximum_boost

Columbia Heights, MN USA

Post Number: 4
Registered: Mar-10
Yep your right!
 

Silver Member
Username: Magfan

USA

Post Number: 921
Registered: Oct-07
Properly done, with music in mind as opposed to just explosions, you will save SOME money with a DIY. Start with home components, not car. Most car subs have ungodly low impedance which home plate amps are generally not comfortable driving.
The money you save VS a pre-made will probably be worth about 2$ per hour.
Depending on the size of the room, a 12" would be about all that's needed. If I thought I needed more, or had a real large room, say over 5000ft/cubed I'd consider a pair of subs. (20x25x10)

What IS the budget?
 

New member
Username: Maximum_boost

Columbia Heights, MN USA

Post Number: 5
Registered: Mar-10
$400
 

Silver Member
Username: Magfan

USA

Post Number: 926
Registered: Oct-07
For 400$ you can buy a decent HSU or equal. Check out the HSU website.

For that same 400$ you can probably build about 500$ worth of sub.

Don't forget, you really only get cheap labor, not a real break on parts.

The 500$ HSU is real nice. Not shake down the walls loud, at least in my medium sized room of about 5000ft/cubed but it will play pipe organ and get all the notes correct or make the whole place shake when the T-Rex comes on scene in Geriatric Park.
I have it configured at 'maximum extension' while 'maximum output' may be worth a few db is I was inclined to try it.

If your room is say.....15x20x10 or smaller (3000ft/cubed) the 12" HSU or equal will kill. If you are an over achiever, save and add a second this coming Christmas! Best of luck with the neighbors, if you live in an apartment.

If you go DIY, take some pictures and make a list of what you used.
AND the result!
 

New member
Username: The_madman

Post Number: 4
Registered: Mar-10
On the cheap. I like it. Make it happen Cap'n ! If you fail , then you learned something , if you succeed , then you learned something ! WIN !

I did it ! I built SubZilla !The backstory is , I have a Yamaha HTIB and the sub was dissappointing. So I take an old 165W car amplifier , 500W computer power supply and the Sub output from the Yamaha , add them to a 12in cheap subwoofer in a 3cu ft ported MDF box. All components go in the box , add power cord and drop the works into an existing ottoman in the livingroom and BOOOM ! Instant incredible floor shaking sub. If I were to buy all the components Id be in for less than $200 , save for the Ottoman. $50 amp , $30 12 in Woofer , $30 500W P/S , One sheet 3/4 MDF $30 , one "Y" cable to separate the signal from mono to stereo for the amp input. Oh , and I opened up the bottom of the Ottoman to let the sound out.
Yes, cheap. Yes bragging. YES incredible booming sound.!





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Silver Member
Username: Magfan

USA

Post Number: 981
Registered: Oct-07
Pretty ingenious! and close enough to the listeners for some real effects......
 

New member
Username: The_madman

Post Number: 5
Registered: Mar-10
Thank you Leo.
It truly was an experiment that payed off. Now that the gears are whirring in my head , Ive added an "AudioEngine" wireless to get rid of the RCA cable ($99), and am considering going with a Pyle 75W rackmount amp to replace the 120V to 12V experimental model.. The THD is less than the plate amps typically are and pretty darn cheap too , at around $60. A Better woofer is also in the plan , but off in the future. I'll see how long this config lasts.
I have to say that I tested this on "Iron Man" and it was truly amazing. I felt every punch , blast off and explosion with explicit detail. As for music, Im not trying to kid anyone that the sound quality is anything near great. One system is definately not like the other.
 

Silver Member
Username: Magfan

USA

Post Number: 984
Registered: Oct-07
I don't know how important distortion is a very low frequencies in movies. I suspect the ear could tolerate up to 10% without even noticing.
Also, a 500 watt computer power supply may only put 200 watts to the 12v outputs. And than it may be divided up? I don't know, but to see if you get more / better out of your rig, try a car battery for a few minutes.
That will have unlimited power, given your situation. Be careful, car batteries are pretty dirty most of the time.
Got a meter? RatShack sells a few for cheap....try taking some measurements of the power supply and voltage drop from loaded to unloaded. If you can measure the current, so much the better.

And you're right, this wouldn't satisfy for music.
Keep an eye on the budget, too.
 

New member
Username: The_madman

Post Number: 6
Registered: Mar-10
Thanks for the advice ! I happen to be a "meter" kind of guy. The amp draws at maximum 5.63A@12.5VDC. From the power supply. Thats just 75 watts. I ran it for 2 full feature films and never had an overheat problem or a significant voltage drop. Like mentioned before , Im going to play "wait and see" to discover just how reliable this setup might be. It was great to play with an idea and see it come alive.

When talking about distortion , i suppose I meant "clipping". Driving the speaker beyond the capability of the plate amp or speaker itself was the issue . Hence the direction to the " bigger must be better" SubZilla.
Thanks again for the offer of your obvious wealth of experience.
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