MT-130 with PD.12SB30 driver up to 250Hz?

Hi

First post and all, just wanted to say you have an excellent forum here.
I can read french so I get alot of useful information from the other pages also.

And also thanks to Marc.O for the many awesome plans that you have produced over the years.

But to the question at hand.
I already have the PD.12SB30, they are from a project that never took of so to speak.
And now I have my eyes set on the MHB-46 that I will make 2 to begin with and maybe at least two more in the future.
And the MT-130 is a perfect match to that sub box.

I also have som Turbomid horns with B&C drivers in them that will take over from 250-300Hz, so I need something like the MT-130.

So to begin with will the PD driver work?
It's very hard to find som hornresp data out there, tried to do it from the drawings.
But the result came out with hardly nothing below 200Hz at all, must be something i'm doing wrong I guess.

And also the width of the front, as it is now it's 60cm outer dimension.
I would like to change this to 50, but the transition between the outer wall and the horn would be cut with a steep angle on the saw so you wouldn't see the ends of both pieces just the outer wall.
It's hard to explain in text what I mean.

The mouth surface area would be almost the same, and it would look better together with my top system.

Thanks

Patrik J
Sweden

The 12SB30 is a bass driver. You must use a low Qts speaker, dedicaced low mid, in the MT-130.

The MT-130 has comparable low end to the MT-121, and is perfect for cabs like MHB-46 or MHB-4818.

You can't change dimensions of MT-130 like this, it will need to make a new design to works.

Thanks for the reply

Yes you are probably right about the 12SB30, guess i'll make some MTH-30 or something like that for those.

You are right in that it would be a new design, but I drew it up in solidworks and compared the dimensions of the one I was talking about and the difference is.
MT-130 original width hornmouth 1676,4cm2
MT-130 with my changes hornmouth 1583.5cm2

I did some simulations in hornresp and compared the two, there is hardly any difference in response with the PS.121.
But I still get nothing below 180Hz from the simulations, and since it's hard to find hornresp input parameters posted online maybe i'm missing something in the sims.
What's your input on this?

Best regards
Patrik