18" sealed sub 6.1 cft. - AVS Forum
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post #1 of 5 Old 06-17-2013, 03:54 AM - Thread Starter
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hi,

I am really considering building this sub here:

6.1cft 18" sealed sub

I have an empire right now and get it to about 18hz in my room. I would like to go lower than 18. But, I am limited by what I can buy here in the EU as we do not have parts express there. Would this combination work in that box size and give me more output than I have now? the wife won't let me buy a new sub, so if I can just piece one together bit by bit, it will make the asking for forgiveness much easier haha.

Behringer EPX3000

+
say...

RCF 18" woofer You can see the specs if you scroll down a bit to navigator (specs).


Any tips or pointing in the right direction would be really helpful.

my room is 12x15x8 and I am not overly concerned about what SPL I get below 18hz. If I could get it down to 12-15hz and have it feelable that would be ok smile.gif Also, it has to play nicely with my two sealed subs that I have already, so ported is not an option.

I have and am able to use a Mini DSP and REW as well.


Thanks in advance!
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post #2 of 5 Old 06-17-2013, 02:45 PM
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The RCF 18" driver you linked to is better suited in a vented enclosure tuned high, its a pro driver. If you want good spl at 12-15hz then you need 2-4 18" drivers with lots of power/xmax or a big enclosure be it a horn or ported.

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post #3 of 5 Old 06-17-2013, 05:12 PM
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The Epik Empire isnt a standard sealed box sub, there is boost applied to the low end, and a high pass filter below that. Essentially it has the response of a ported sub without the port (and free gain)



A regular sealed sub with no EQ will not match this sub.

Take this woofer

http://www.thomann.de/gb/eminence_kilomax_pro_18.htm

Put it in your 6 ft3 sealed box, get a Behringer NU3000DSP and add a boost of 10 db, Q 2.5, Fc 20hz with the amps EQ function, and you will basically match the response of your Empire



I would try to add more bracing then that box you linked shows also...
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post #4 of 5 Old 06-17-2013, 10:19 PM - Thread Starter
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Thanks for the advice guys! I have some work to do it seems...I will do some more homework and reconsider drivers and box sizes. I am willing to go to a bigger box. but I am not really willing to build an 18" sealed sub that only matches my Empire (which is not really a slouch but still)...
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post #5 of 5 Old 06-17-2013, 10:46 PM
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Quote:
Originally Posted by McStyvie View Post

Thanks for the advice guys! I have some work to do it seems...I will do some more homework and reconsider drivers and box sizes. I am willing to go to a bigger box. but I am not really willing to build an 18" sealed sub that only matches my Empire (which is not really a slouch but still)...

You really need to find a different source of subs, even car audio subs can work great for HT. Pro audio subs basically maximize output above 30-40hz , as it's practically impossible to reproduce frequencies below that in theaters/stadiums, and outdoors.

Your dual 15" Empire also has more cone are then a single 18" woofer. Approximately 1600 cm2 vs 1150 cm2. It definitely performs well for what it is.
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