MTH30 Questions : Complete Noob!

[ghettosynth]

Originally Posted by Brian Steele

I'd go for something in-between . The FR curves suggest that the THAM12 is too small and the MTH30 is too large for the driver you modelled.

Ah, yes, me and goldilocks, looking for the solution that's just right.

[tb46]

Hi kornnylike,

Thanks for the additional data. I assume, that the overall dimensions are correct (I derived them from the manufacturers data/drawings)?

Regards,

[KMossman]

Originally Posted by ghettosynth

1) I see that the MTH30 calls for MDF. I would rather use plywood for weight, is this a good idea? If so, does it require changing the plan in any substantial way? Any experiences with plywood vs mdf would be helpful here.

I recommend MDF - it is stiffer, and less likely to resonate. If you use plywood then use the thickest you can, and consider more bracing,and stiffeners.

Keep the internal dimensions the same.

Don't know where you dwell or the conditions but you might to consider using marine grade - less likely to 'fall apart' when the humidity is high.

MDF is heavy! I built a mini-platforms [with casters] for when I had to move my LH transmission line speakers.

[tb46]

Hi Y'all,

Here is an updated drawing of the B&C 12PS100 showing the dimensions for the cone, and the area needed for cone correction in the middle of the driver.

Regards,

[kornnylike]

Originally Posted by tb46

Hi kornnylike,

Thanks for the additional data. I assume, that the overall dimensions are correct (I derived them from the manufacturers data/drawings)?

Regards,

Tb46
I recheck all the measurements of the b&c 12ps100 cone dimension several times to make sure that they are all correct.

[Djim]

Originally Posted by Chaps

There were purchased from thomann in january. Guess they are the new model.

Hi Chaps,

Looks like you can test the same volume correction (first stage) of post#131 together with a centre brace, for the Tham12. It counts for both models of the PD.12SB30, old and new.

[Djim]

Originally Posted by kornnylike

Tb46
I recheck all the measurements of the b&c 12ps100 cone dimension several times to make sure that they are all correct.

Hi kornnylike,

How did you measure the depth from the front to the centre of the dome and the depth from the edge of the dome to the front?

The reason I ask is because TB46's model, based on your measurements seems odd. When I checked my own drawing it looks like you measured the depth from the edge of the cone (where the cone ends and the surround begins) instead of using the real front See picture;

[kornnylike]

Djim and Tb46

After reading Djim post I recheck all the measurements and found that few of them was a little bit off. This one I make sure it was measured correctly.

Please let me know if you guys need anything else

B&C_12PS100_drawing_06.jpg

[tb46]

Hi Djim and kornnylike,

What is the dimension from the mounting edge of the speaker to the triple roll surround (tip of the rolls and approximate center)? That still looks a little deep based on kornnylike's data in Post #159 (15/32" - 0.46875" [11.9mm]).

Regards,

[kornnylike]

Originally Posted by tb46

Hi Djim and kornnylike,

What is the dimension from the mounting edge of the speaker to the triple roll surround (tip of the rolls and approximate center)? That still looks a little deep based on kornnylike's data in Post #159 (15/32" - 0.46875" [11.9mm]).

Regards,

Tb46
Post a drawing of what you asking and I will measure it for you.