New sub

For my line-array I was looking for a good sub.
I tried punishers but they didn't go low enough.
I tried B2's, they go low enough but they didn't sound good enough and they are very big.
I tried front-loaded 18" BR, they are to big and not loud enough.
Finally I start drawing, calculating, simulating and building a complete new double 18" sub. This sub is loaded with two Beyma 18G550 and tuned on 35 Hz. Today I finished the first prototype in MDF and it sounds very good.
The cabinet is 60*70*90 cm and loaded with two 18" Beyma speakers.
Next project is building 4 of these cabs in 18mm birch plywood.

Hi, Is yhis like the EV T18 or Beyma's new sub plan or something a bit diff????VECTORDJ

Its certainly nothing like the EV T18, even just judging from the pics of both cabs.

It looks very much like beyma's new sub cab, but doubled up. so same principle (advanced reflex loading, or tapped-horn-ish, or whatever its fashionable to call this these days).

Design seems to be similar with EAW SB1000 without 4 round ports in corners. 

Jake_Fielder wrote: is the port coming out between the drivers? What method did you use to tune this? cheers

The port comes out between the drivers, the tuning was the biggest problem, normal calculation programs didn't work.
I did a lot of trial and error with different port length and every time I listend and measured with a sine wave and watch the cones for the X-max.

Jake_Fielder wrote: cool, how long is the port? or does it just end at the end of the drivers?

The port is 23 cm but it is difficult to say where the port starts.