Speaker design

[eitanwaks]

I've been wanting to build the speaker for very long time now. I finally have my drivers (Morel MW 267 and Morel supreme 110).

I've attached a file with my design. I would love to get some input. Preferably critiques of that I can improve my design to make it sound as best as possible.

The specifications for the drivers are as follows:
MW 267:
suspense compliance - 926 uM/N
mechanical Q. factor - 2.5
electrical Q. factor - 0.5
total Q. factor - 0.42
mechanical resistance - 2.01
moving mass - 26.7 g
equivalent case air load (VAS) - 62.5 L
effective piston area - 219 cm^2
net weight - 1.35 kg

the specifications were taken from the manufacturer's web site.

What do you think of my design?

[RobWells]

Just my opinion but I'd lose 'section C-C' and change it to this, adding in section D-D.. (Same as 'new' section C-C)

Cheers,

Rob

[trusound]

looks like you have been looking at the magico site

[eitanwaks]

Rob,
I think you misinterpreted the drawing. The portion of the drawing to you propose to remove isn't actually part of the cross-section rather it is one of three axial rods that connect the front plate and the backplate.

trusound,
isn't that speaker just a beauty. In fact, before modeling my speaker I saw an advertisement for the magico speaker on a web site. I don't recall which. Prior to modeling this speaker I was thinking about trying to copy a Wilson Alexandria. I do believe that copying existing speakers greatly enhances the chances of success. If somewhat along the lines of standing on the shoulders of giants.

Back to the subject at hand, what do you think the total enclosure volume should be? I would greatly appreciate the help.

Eitan

[johngalt47]

Eitan,
Do you use any speaker modeling software like LspCAD?

[eitanwaks]

Johngalt47,
no, I didn't use LspCAD. I model everything using a professional CAD software called Solid Works. A use this software because as a student of mechanical engineering I have been trained to use it. The only reason that I modeled my speakers using software is because I planned to cots the pieces using a homemade CNC machine (which is another topic altogether).

For the general box enclosure I'm not sure that the time taken to model the enclosure would give any benefit. Also, I'm not familiar with LspCAD. I do not know what it's capabilities are regarding modeling or anything else for that matter. I was under the impression that it is a program that helps you choose proper enclosure size and model crossovers and things of the like.

Eitan Waks

[Lionel]

Hi Eitanwaks,

Seems to me that John was asking you if you have used a speaker design sofware to calculate ideal volume and xover corresponding to the drivers you have chosen.
LspCAD would help you to do that not to draw the design your speaker. For that Solidworks is a top class software.

Wish you a lot of fun, your project looks very nice.

[johngalt47]

Yes, that was what I meant. There are several software packages available that will help you arrive at a more or less reasonable design from an electrical/mechanical/acoustic standpoint.

[RobWells]

Originally posted by eitanwaks
Rob,
I think you misinterpreted the drawing. The portion of the drawing to you propose to remove isn't actually part of the cross-section rather it is one of three axial rods that connect the front plate and the backplate.

Eitan

Ok Sorry - the drawing wasn't too clear. The design looks a fair bit like my old speakers, which is why I took an interest.

which type of stuffing?


Good luck with your project,

Cheers,

Rob.

[eitanwaks]

RobWells,
after browsing through the thread that you provided I can only hope that my project turns out half as good as yours. How did your speakers sound at the end?

Lionel, johngalt47,
if I recall correctly when I designed the speakers I had someone who has a program called "Bassbox" give me the proper parameters for the volume of the enclosure. The problem is that he used the wrong speakers to calculate the size. This is why I'm asking the question now. It is fairly easy for me to add to the volume. This would only require adding more layers of MDF thus increasing the height and volume.

Regarding the crossover, I have a different thread that I started regarding this topic. Would you suggest joining both threads? Which type of crossover would you suggest? First-order, second order, third order etc.? How can I get a proper schematic for a good crossover?

Once again, thank you for all your help,
Eitan Waks