[Red Dragon Audio]

I am thinking about making a pair of subs to replace my el cheapo KLH subs I bought from Costco.  They are great and all for what I paid but they don't have the very low end response I would like as well as other features.

I want to use the http://www.partsexpress.com/pe/pshowdetl.cfm?&PartNumber=295-560&DID=7"> quattro series 15inch sub from Dayton Audio either in a sealed or ported box.  

Here are the suggested boxes from Dayton:
http://www.partsexpress.com/pdf/295-560s.pdf

My question about the ported box is this:  Can I lengthen the port to lower the tuning frequency to 20Hz safely?  The speaker says it is rated to 20Hz so I figure it's okay.


The sealed box states an F3 of 38Hz; how much lower in SPL will it be at 20Hz?  12dB?


I want to use this http://www.partsexpress.com/pe/showdetl.cfm?&DID=7&Partnumber=300-804">amp

[ooheadsoo]

Here's a tool for you: http://www.pvconsultants.com/audio/boxmodel/subsim.htm

Or you can use unibox from that same site.

WinISD is an easy to use backup but has some issues, I forget what they are though.

Now you can play around with all sorts of drivers and boxes to your heart's content.

Two designs I'd be looking into myself: Rythmikaudio's directservo sub and gr research's new sub and passive radiator.

[Red Dragon Audio]

Thanks ohead,


I was looking at the sub system from GR Research and I even messed around with the idea of putting two of them in a 7.5cuft box with a port tuned to 20Hz.  Large box yes.  Monster bass.  Probably too much since I want two seperate subs.  Though I could just do a pair of the passive radiator versions for each front corner.

I've never heard of Rythmikaudio's directservo sub.  Going off to do some research.

[markC]

I've been thinking of swapping out my cheap ass Yamahaha subs for some serious air movers too. The GR setup looks good at first glance and I plan on doing some resurch and DIY in the future.