recommended 12" and high for empty box

Hi,

still love this forum, what a great ressource !!

well I got those empty boxes on ebay:






They are unloaded at the moment, there is a 12" hole and I can cut to size for the high.

I would like to use them as Mid/top over some HD15 (to play hardtekno, tribe and psytrance)

Three questions:

-Will I have problems using none ported mid over HD15 ?
(the porn horn are too expensive/not available for now)

-Would those boxes loaded with P.audio C12 300MB and 1"+horn, crossed at 180Hz be suitable?

-I know that the volume of a box is important to choose the driver in order to have bass, but those boxes will be crossed at 180Hz, does it mean that my choice can be easier? (please don't laugh at my newbieness )   

If you have any suggestion for tweeter+horn from thomann
(I have to order T.amp+ultradrive from them), or any other 12" with a good SPL don't hesitate.

thank you for your help.


Edited by GIVEorTAKE - 12 July 2006 at 6:16am

thank you for your answer.

I have set the box design and P.audio driver parameters in Bassbox, and I have those outputs:


*sorry for the size*

I tried different configurations, and ended with a vented box with two ports (calculated by the soft!().

What do you think of the results?

Should I stick to that, or do you see any mistakes?

two outputs:



This software actually raises other questions like : damping from none to heavy and the vent end type (one/two flushed/flared) it seems that
changing those settings does not end up on the graph.
So what are the recommendations for this type of box+driver based on your experience ?

Knowing that this box will be crossed around 180Hz, do I really need to bother about all of that?

that you for the feedback, I think I'm getting somewhere by learning big-time !

Edited by GIVEorTAKE - 24 June 2006 at 4:01pm

Now it's all fixed for the drivers ! thank you.





Edited by GIVEorTAKE - 27 June 2006 at 4:18am

I would recommend a shelf port across the bottom if you can fit it, otherwise ports as large as possible on the front.

The larger the port, the lower the velocity of the air in it, this reduces compression in the port and noise caused by turbulance.  You can mount ports in the back but that tends to be more for hi-fi cabs.  For PA you are probably better off with the port on the front and in phase with the cone.

Still got no pics, but the result is brilliant!Thank you.

I just bought one new cabinet that will be used with them,but I have a few questions(for a change :).

I wonder how to load and set it up (still based on the fact that all three boxes will be used on top of 12 HD15):

-Should I use the two previous boxes as by example left,
and this new one as right channel (but in that case one
high frequency horn will be missing).should I look for one coaxial and one C12 300MB (just saw the post on the P Audio BM 12 CX38)?

-or should I use the previous two as left and right, and use this new box as a center(sum of left and right medium on 2 C12 and sum of highs for the high horn).

here is the cabinet:


Thank you

Edited by GIVEorTAKE - 18 October 2006 at 3:56am