Help with design for EV Pro-12B Coax

[botrytis]

I have a pair of these coax's and would like to build cabinets for them. The speaker parameters are:
VAS 150.1 liters
QTS 0.5295
FS 40
QES 0.552
Qms 13
Re 5.5
SD 0.0506
Xmax 3.3
Pmax 25
Mms 30
Le 1.75
I have modeled, using Unibox 4.04, and both a sealed and a prted enclosure. the sealed system has an enclosure of 108.3 liters with an F3 of 58 Hz or the ported box of 280 liters with an F3 of 26 Hz. Which would be more preferable? If the ported box is preferable would it be better to have one big diameter port or 2 smaller ports.

Any input would be appreciated.

Dave

[GM]

What's preferable depends on your listening 'tastes' and the room's acoustics, so don't have a clue. Personally, I design/build for all the acoustic gain I can get for a given space and if it winds up being too much, then dial it back rather than having too little and increase distortion through EQ gain.

WRT vent size, a single large one is the most efficient, but sometimes using two or more smaller ones can be a damping tweak.

WRT to your sims, these specs assumes you will be driving them with an SS amp. If tube driven, then the effective Qes/Qts will go up based on the amp's output resistance, increasing cab Vb/lowering Fb.

GM

[djdan]

Try this ( unefortunately only in romanian laguage ) but you can make an opinion .

I've made this cabinet and the sound is great .

http://www.difuzoare.ro/modules.php?...=article&sid=4

[kelticwizard]

Don't forget that a box of 280 liters is about 10 cubic feet.

If you use 1 in thick building material, that would be 60 in high, by 18 in wide, by 25 in deep, approximately.

Are you prepared to deal with a couple of boxes that large?

You can build ported boxes somewhat smaller, but they will have a hump in the bass. You might not mind that. You might be able to go down to 5 cu feet, if you don't mind a 2 dB hump in the bass.

Are you planning to use these for home or PA use? If home use, do you want the sound to resemble something like what you would hear in a club?

[kelticwizard]

Here are three setups using your speaker, from WinISD.

Red is 5 cu ft, vented, tuned at 40 Hz
Orange is 10 cubic feet, vented, tuned to 28 Hz
Blue is 5 cu ft box, sealed.

[botrytis]

Well, I have been working with a friend off od AudioKarma.org to design boxes for these speakers. We basically came up with a 170 Liter box tuned to 30 Hz The green line is 150 liter tuned to 34 Hz and the yellow line is 170/30 Hz. There is still a small bump in the bass, but I am not sure I will actually notice it.

[botrytis]

This is a pic of the box design and we are still working on it.

Dave

[botrytis]

My next task is working on the crossover. I have a schematic of the Galante crossover used for these drivers in their 6K -*K speakers they used to sell. The attached pdf is a copy of the the crossover (sorry it is upside down - that is the way I got it and I don't have Adobe to fix it!!).

Anyway, my problem is two-fold. 1. I can't seem to find all of the parts in the schematic - what could I use as replacements. 2. I noteced that the tweeter is hooked in out of phase but where would it hook in - before or after the 8 ohm 50 watt resistor.

Any and all comments are appreciated.

Dave

[GM]

What can't you find? The 8 ohm 50W 'resistor' is a potentiometer so you can adjust the tweeter's level, and looks like it's connected in-phase.

GM

[botrytis]

I am not good at reading these diagrams, so thanks for pointing that out!


I am having a hard time finding sources for the parts. I guess I should have been clearer. This will be my first real speaker build so please bear with me.

Dave