Some design help please

[Ling Gowa]

I have some Dynavox LW6004PMR 6-1/2" woofers. I would like to create an MTM with the Vifa DX25TG-05-04. Idealy I would like to use a 1 cu/ft ported box.

[Ling Gowa]

Hmm, I guess not.

[DcibeL]

It's Do It Yourself Audio, not Do-It-Someone-Else.

I find posts like this mildly offensive. Is there something specific you would like help with, or just want someone to do all the design work for you?

[picowallspeaker]

Why not ?
If you have four of them ,you can try a compact push-pull . If the tweeter has enough sensibility ,92 dB at least ,it should match .
I'm having difficulties in finding a tweeter for such configuration ,since it has to be 96 dB and LITTLE...was thinking of some-same ring radiator with a waveguide.

[DcibeL]

Hi Picowallspeaker,
Vifa BC25SC06-04 is rated 96dB@2.83V (but it's 4 ohm), but really only about 95dB. See Zaph's measurements, it's an excellent tweeter, and really inexpensive as well.

I think you'll not find much for what you're looking for without a waveguide/horn.

[Inductor]

Originally Posted by Ling Gowa

I have some Dynavox LW6004PMR 6-1/2" woofers. I would like to create an MTM with the Vifa DX25TG-05-04. Idealy I would like to use a 1 cu/ft ported box.

Why you need your 1 cu/ft box. It doesn't work like that. You should have, at least, a 40L interior volume enclosure (+ vol. of drivers, port, wood), instead of the 1cuft/28L interior you ask.

Dynavox LW6004PMR 6-1/2" Woofer
Vifa DX25TG-05-04 1" Fabric Dome Tweeter

Now with a 30L/45Hz BR, and a 10L closed box for the second driver you get an interesting MTM loudspeaker.

[Inductor]

MTM Xover for 2xDynavox 6 1/2" Woofers and Vifa DX25TG-05 1" Tweeter.
For simulation, gave the approx. dimensions for the front baffle (HxW): 500x220mm
(Good that the f/z data files where available for simulation)

[Inductor]

This is the freqs. after I reset the settings from previous drivers that were on. You see a little change on the LF and F3.

[Ling Gowa]

Originally Posted by DcibeL

It's Do It Yourself Audio, not Do-It-Someone-Else.

I find posts like this mildly offensive. Is there something specific you would like help with, or just want someone to do all the design work for you?

Yes, I can see how you would take it that way. Sorry about that. I may have tried to be cute by keeping the thread bumped and was definately not meant to offend.
I've been having a bit of trouble with this one because I'm moving from X-Over-Pro to PCD. I'm aware of the learning curve and my Excel is giving me some headaches but I'm determined to make the change.
I've heard that the Dynavox sounds better ported. I have a set of 1 cu/ft boxes and that's the reason for my preference. I realize that it may not be ideal for these drivers but I needed some confirmation. I will build new ones.
I have heard both the Dynavox and the Vifa in seperate systems and liked what they produced. They can certainly take a licking.

I also tried to model the box in BassBox-Pro but sadly I'm still at point zero.

[Inductor]

Originally Posted by Ling Gowa

I've heard that the Dynavox sounds better ported.
...

Yes, the Dinavox is ported (BR), the second one is closed box (mid-woofer).
The best reassurance is if you can make a successful design, and test it (for you and for us). Now that was one, between a few different, of the possible MTM designs. You can see that it looks like a 3-Way design. You can also go for a pure MTM, but I will leave that at your discretion, since this design seems to work very well (with difficult/not-so-easy drivers), and a good way to start-up your project. If you leave the xover outside you can make adjusting more easy, but have in mind that, in this case, the enclosure is different/separated for both woofer/mid-woofer.