dual 15" Reflex Sub help

Guys,
i was going to get a pair of these
http://www.fullcompass.com/common/files/2839-XP509 Community specs.pdf

at a pawn shop but they wanted 400 for the pair
and since the drivers seems to be in very bad condition i decided to build my own
ported boxed cabinets

what do you suggest, i prefer non trapezoidal as is it harder to do the cuts on the plywood, a rectangular box will be better
any pointers ?

i plan to furnish the box with neodymium drivers
and use 1/2 plywood with internal bracing
to make the box not too heavy
3015LF or 15NDL76 to say some in paralleled to get 4 ohms per cab

Thanks
 
What amp will you use?
What type of music?
What size of box.

The FatalPro 18" neo is not much more expensive.

Music is ballad/pop with 2 live singers, keyboards and drum machines
live electric bass sometimes, but mostly 2 singers with arranger keyboard and drum machines

the size of the box , i like the size of that dual 15 from community
so i prefer a dual 15 than a dual 18 ,,, too large
mostly indoor venues
i have 2 peavey pr12 and with the mid highs spl's i am ok
but i lack the low end ompth so thats why i am looking to make a sub
i have a crown XLS drivecore 2000
and dbx driverack PA... at last... Sigh!
 
I checked that plan. To me that's no sub. The response drops and there is no output below 30Hz. That is a PA bass cab to me.

You must decide by yourself, what kind of output you want. Music doesn't have much below 31Hz but movies with a LFE audio channel do.

How much spl do you want? Do you live in an apartment or a house. How big room, what material are walls? What size is the room? Do you want to scare the neighbors?

If you need a really low-going HT sub, it must be a really low-tuned BR or closed box system. Then give some max size and try to find driver elements that work well in that composition. Simulation are a good help here. With well matched parts you'll get lots of good sub-bass and bass (25-100Hz) with less than 100W.

Sorry, I don't want to give examples, there are milllion ways to go.

Please google for Sonotube sub or LLT sub (usually 1x15")

Personally I go the easy way with large closed cabs now. I'm not happy with BR-subs.
 
Juhazi,
i think you missed this info that i posted on an earlier post on this thread

Music is ballad/pop with 2 live singers, keyboards and drum machines
live electric bass sometimes, but mostly 2 singers with arranger keyboard and drum machines

the size of the box , i like the size of that dual 15 from community
so i prefer a dual 15 than a dual 18 ,,, too large
mostly indoor venues 100-250 people
i have 2 peavey pr12 and with the mid highs spl's i am ok
but i lack the low end ompth so thats why i am looking to make a sub
i have a crown XLS drivecore 2000
and dbx driverack PA... at last... Sigh!

No cinema sound.. PA sound
 
Welter can you paste the links to the right post
i tried to follow but filtering the info from 34 pages
is not easy
I prefer DJK's slot load designs to the 18 sound PP, which wastes too much space for the plenum, reducing effective cabinet volume and lessening the positive effects of PP.

DJK's plans are in the second and third post, with links to more designs:

High Efficiency Speaker Asylum

And you may want to read my comments in post #7 ;).

Art
 

jbell

Member
2003-04-02 4:34 am
.
If you really want a PPSL instead of a TH, like a SS15, I can whip up drawings a dual 15 on something cheap, like the dayton pa380, or something like that, in 200liters tuned to 40hz. It should do low to possibly mid 120's. The push pull slot load would be a ton cleaner than just a basic reflex cabinet, but not much more involved in construction.

You have a budget for neo drivers? and are planning on using one channel of your amp for subs, and one channel for your pair of tops?
 

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