15 inch subwoofer set up

[coldsteel]

I have a 15 inch down firing subwoof i plan on using over a cement floor purely for music, i have 18 inches of space to work in what should the dimensions of my cabinent be to get the best sound out of it?

 

[mazersteven]

Are you asking a question about building a subwoofer enclosure (cabinet)?

 

[allargon]

I have a 15 inch down firing subwoof i plan on using over a cement floor purely for music, i have 18 inches of space to work in what should the dimensions of my cabinent be to get the best sound out of it?

Are you asking how to build your sub enclosure, advice on bass traps, or other stuff?

Are you asking about something like this?

http://store.audioholics.com/product/1398/66199/auralex-subdude-trade--subwoofer-flotation-device

Cement for music? Ouch... Are you adding some treatments to the room?

If you're building your sub enclosure, are you using any software to design the cabinet around the particular driver you're using?

http://www.linearteam.dk/default.aspx?pageid=winisdpro

 

[TLS Guy]

I have a 15 inch down firing subwoof i plan on using over a cement floor purely for music, i have 18 inches of space to work in what should the dimensions of my cabinent be to get the best sound out of it?

I don't understand your post at all. If the woofer is down firing, I have to assume it is already in some type of cabinet. There is nothing unique about a driver that makes it "down firing". If it is not in a cabinet, then the cabinet volume and porting, if required, are going to be determined by the Thiel/Small parameters of the woofer.

So if it is a cabinet you want to build for that driver, it is impossible to help you without knowing the T/S parameters of your driver. I have to tell you the enclosure size will be dictated by the driver parameters and NOT your space limitations.