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-   -   How to tune a sub box (http://www.diyaudio.com/forums/subwoofers/74128-how-tune-sub-box.html)

Hayden 16th February 2006 11:41 AM

How to tune a sub box
 
Iím totally new to this whole speaker design thing.
I have a setup their car subs but for home use see photo below itís the box with the 2 12Ē subs in it, the box was designed for 2 10Ē subs but I put 2 12Ē in it and it sounds crap how do I tune it? Is it possible for the 2 12Ē to work? Do I just start adding cloth to get the box volume smaller? Itís a sealed box with no chambers.
Thanks

http://img206.imageshack.us/img206/262/cimg23097vp.jpg

richie00boy 16th February 2006 11:56 AM

There's not a lot you can do really in all honesty other than adding EQ circuits or build another box.

Please clarify what your issue with the sound is - there is an extremely small chance that venting the box may help.

Hayden 16th February 2006 12:53 PM

I could get over 40mm peak to peak travel out of them at low frequencies but playing bass cdís and techno the cones move allot but not much bass my black 10" there in the photo has nearly as much bass as they do.

Hayden 16th February 2006 12:55 PM

Iím not really after sound quality just low bass. the box has no bass.

richie00boy 16th February 2006 01:20 PM

Maybe you wired them up out of phase then. Make sure + and - are wired the same way on each speaker.

Iron-Wizard 17th February 2006 06:30 AM

You may infact be running everything out of phase so you will get no bass at all,

check all the woofers cone movment with a small voltage source, you only need say 5 volts and mark the positive and negative terminals on all your speakers.

one question, Why do you have so many woofers in your room?

If you want more bass just replace the 10 inch cones in your 3 way floor stanind speakers or run one woofer in a corner.

The more speakers you run from one amplifier the worse the sound quality gets and you will only fry the amplifier.

from the looks of things you have a 0.5 to 2 ohm load on your poor amplifier.

Hayden 17th February 2006 10:07 AM

It sounds like its out of phase but its not.
Iím a bass freak after low bass lol you cant kill my Yamaha amp:)
Iím going for one sub Iím selling them and making a real subsonic woofer low frequencies like 10hz or so.
I have reversed the phase it also depends on the signal you get good bass at a certain hz; then at another you donít but you can reverse the phase and get it good again its weird, I used a frequency sweep and test tones I made.
4 ohm loads just using rears and canter for the subs

Hayden 17th February 2006 10:09 AM

lol should cut them out and put 2 15" in there. See how that goes

kinser 17th February 2006 10:15 AM

Hayden,
You siad that you are running the subs from the rear and center speaker outputs, thats the problem!
You have to run the subs through a seprate amp with a low pass filter. maby get a plate ampfrom www.partsexpress.com they dont cost much.

BTW how old are you?

Kinser

Hayden 17th February 2006 10:34 AM

Iím turning 21 soon, Iím running the second cd player to the third device which is a amp to drive the towers and a 10Ē sub on the rear channel then it goes into the bottom amp to feed the 2 12Ē subs they all get good power.

But when I hook up the single 12Ē in the mdf box it has more bass then the whole setup, it is strange.


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