Comment on my DIY Sub Design

[htgeek]

Well now I am confused. When I put my power rating in the velocity goes through the roof literally. It's off the ******* scale. See image

http://img.photobucket.com/albums/v160/lobo2401/airvelocity.jpg

I have also uploaded a new graph from WinISD pro seen here.

http://img.photobucket.com/albums/v160/lobo2401/Pro32in.jpg

The gray is the new graph and purple the old.

 

[DcibeL]

Your graph is showing ft/second instead of meters/second. The 53.8 ft/s that you are seeing at 16Hz translates to 16.4 m/s which is perfectly acceptable.

You should also look at your cone excursion graph with the 300W input and make sure that the driver will be below xmax. I am finding that *usually* the driver will reach xmax before its RMS input rating on ported designs. This is not a problem, as long as SPL when xmax is reached is acceptable for your needs. Theres a graph for that in WinISD too .

 

[simon5]

The gray is the new graph and purple the old. [/B]

I think it's the opposite hehe!

Yes most people accept 34 m/s (10% speed of sound) but people with higher standards get to 5% so 17 m/s.

16.4 is perfect.
Like Dcibel said, check excursion, you probably need less than 300W.