Can someone doublecheck my DIY sub design?

[cucamelsmd15]

Driver: Dayton RSS390HO-4
Amp: Dayton SA240
Box: 20x20x20 cube, double baffle front, internal brace. 3.61 cu ft airspace, minus .12 cu ft for port and 0.26 cu ft for driver. Final airspace is 3.23.

Win ISD plots:



Thoughts and concerns? This is for mainly HT usage in a 13.5wx18dx8.5 high room, so I expect the room gain to fill out the ~20Hz area nicely.

[ThomasW]

Room gain won't fill in below the 25Hz Fb since there will be no output below that frequency.

I'm not familiar with that amp, if it doesn't have a hi-pass around 21-22Hz you'll need to buy one otherwise the driver will unload trying to play frequencies below Fb

[cucamelsmd15]

PE says the high pass is F3 at 18db. Is that sufficient?

Other than output below 25Hz, is the design solid? Should I tune for a lower frequency?

[ThomasW]

PE says the high pass is F3 at 18db

This statement makes no sense where did you read it?

[cucamelsmd15]

This statement makes no sense where did you read it?

Parts Express. Here:

http://techtalk.parts-express.com/showthread.php?p=1557165

[ThomasW]

Ok so you meant to post F3 is 18Hz, not 18dB?

I'd tune it lower (say 22Hz) if you can live with a larger box

[kevinp.]

Or go with a 12" since you're giving up so much extension by underpowering

[cucamelsmd15]

Interesting, I modeled the 12" Titanic against the HO, and this was the result.


Looks like significantly better low end in the same size box.

Based on this, should I stick with the HO or go with the Titanic?

Edit: I may step up to the Bash 300w as well.

[ThomasW]

Probably want to compare apples to apples as far as box tuning is concerned.

Given it's Pmax the 500 watt Bash amp is a better match for any of the drivers being considered.

If there's an additional $20 in the budget for the driver you might consider the Shiva-X

[cucamelsmd15]

The Shiva looks like it will require a larger box than the Titanic. Since Im on a budget (and have a wife :lol: ), the Titanic and the 300W Bash looks like its my best bet.

And of course, I have to leave room for upgrades.

[cucamelsmd15]

Pulled the trigger on the Titanic 12" and the Bash 300w this morning! :B