Hi Guys.

I have been working on a 4344 project for a while, and done some real engineering and 3D modeling for this project. The idea is to make a fully active speaker system based on Hypex UcD modules (http://www.hypex.nl), but be able to start out with a passive network and add amps and stuff later. The cabs have enough internal space to put all the network components, amps, powers, and transformers inside. The compartment for the electronics is part of the internal sub-structure, and can be accessed trough a door in the back panel.

I have constructed a sub-structure as a back-bone for the cabinets, and used a lot of bracings for the baffle and back plate. This should make the cabinet much stiffness and more stable than the original JBL.

The cabinets are deeper than the original 4344s due to the volume occupied by the amp/filter box, sub-struc and bracing, but the net volume is probably close to the original.

Some preliminary data:

Dimensions = 1050 x 635 x 410 mm (hwd)
Sub assy weight = 12,5 kg (fiber board with density 0,685 g/cm^3)
Braces weight = 3,25 kg (pine wood with approx density 0,25 g/cm^3)
Driver weight total = 23,5kg
Total weight = 81,55 kg

Total internal volume = 210,6 L
Dog box volume = 15,4 L
Filter box volume = 13,8 L
Sub assembly volume = 18,26 L
Bracing volume = 9,23 L
Net internal volume =153,91 L
Volume occupied by drivers and horn (except 2123) = 7,5 L (+-0,1 L)
Net internal volume with drivers in place = 146,41 L

Duct dia = 100 mm id

Parts used:
2235H, 2123H, 2420J with H-91 and Coral AL-603, 2405H

Take a look at the pictures and give me some feed-back on the design, construction, and baffle layout. The production drawings will be made later when I have necessary data for all the smaller parts.

I need some help with the duct length. I guess some of you guys out there know how to calculate this based on the given data.

You can find pics of the 3D-model in 1600x1200 here: http://www.designcut.com/4344