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Discussion Starter #1
I recently purchased ICIXSound.COM Forums - EHQS 12" OEM Subwoofer for $12. It was such a good deal that there was no way I could turn it down. Now i'm looking for an amplifier that will fit ontot he box I build for it. I found a few but i'm wondering what would sound best.

Parts Express:Dayton SA70 70W Subwoofer Amplifier
Parts Express:Dayton SA70 70W Subwoofer Amplifier

is 30 watts really worth the extra $35? I definitely don't want to underpower this, but people have reported that it works with as little as 50 watts of power.


If you have any input on if i should build a ported box please let me know! right now I'm going with a sealed box because the ported stuff looks fairly complicated to build and tune correctly.
 

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Discussion Starter #3
I see. now I'll have to find plans for them. Does this mean i have to buy a tuned port or can i just leave an open slot? when looking i see stuff tuned for certian frequencies, how do I know what I want?

Downfiring was in my plans. I intend to flush mount it as well.
 

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Allen
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You tune it by varying the dimensions of the port. If you make the port shorter, the tuning freq. will go up and longer it will make the freq. go lower. You want this box to be tuned between 26-30 hz

Here is all the formulas to get the exact freq. http://www.diysubwoofers.org/misc/portcal.htm

look around on that site lots of good info there.
 

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Allen
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Alrighty after about an hour and a half of calculations I think I got it figured out for you.

The box deminsions will need to be 14"w X 24"h X 15"d using 3/4" MDF. This will give you 2 cubic ft of air space.


For your port use a 3" round port that is 9 & 3/4" long, this will tun your box to 28hz. The port should be placed 6" from the top of the box on the front.

This amp.
http://www.partsexpress.com/pe/showdetl.cfm?&Partnumber=300-805

Either 4 of these
http://www.partsexpress.com/pe/showdetl.cfm?&Partnumber=260-774
or a set of these
http://www.partsexpress.com/pe/showdetl.cfm?&Partnumber=240-716 (I prefer the spikes)

And for your port
http://www.partsexpress.com/pe/showdetl.cfm?&Partnumber=268-322
http://www.partsexpress.com/pe/showdetl.cfm?&Partnumber=268-320
http://www.partsexpress.com/pe/showdetl.cfm?&DID=7&Partnumber=268-326 Need 2 of these
http://www.partsexpress.com/pe/showdetl.cfm?&DID=7&Partnumber=268-328 You will cut this to length needed.
 

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Discussion Starter #11
I should pay you for doing all of this for me, I had no idea it would take that long.

if the driver is only rated to 200w, why do you recommend a 240w amp?
is there an advantage to using the spikes for feet? I was sorta just going to use extra blocks of wood.
 

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Allen
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From what I read in that thread you linked to that sub is ideal for 200-250watts and parts express has that 240w on sale for $99. The spikes will keep it from walking around the room and help eliminate vibration noises.
 

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Discussion Starter #15
touché.

I'm gonna order that stuff tonight I think. Hopefully it'll get to my parents house when I'm around... It's not liek i can build it here. I have a circular saw(ick) and a power drill...feasible, but my dads table saw will be so much easier and produce less waste.

thanks again for your help. what's your paypal?
 

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Allen
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Yeah it will be a lot easier to do on a table saw, skill saws can be a pain unless you have used them alot. I just got a table saw a few weeks ago so I am hoping to build a new box for my 15s sometime soon. I don't have a paypal.
 

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Discussion Starter #17
Increddible. I got $125 from my grandparents to use for christmas(i was told to get nothing school related) And my bill is $124.58 :) Course I gotta buy the box material, but that shouldn't be more than $40ish.(I'm also building a box for a 8" car sub)
 

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Discussion Starter #19
at home, i have a camera..like 3 of them between all my siblings. I have a sneaking suspicion that my parents are gonna get me one for christmas as well. Build pictures(along with all injuries) will be included.

hurray fro free ups ground shipping and for it being shipped from ohio so it'll be here in a matter of no time!
 
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