Short bandpass

lonesouth · 08:53 PM

I'm designing a center console for my early bronco and wanted to incorporate a sub. I decided on a bandpass as a way to protect the sub from sticks, branches, elbows, etc, but am starting to question if I have enough room.

I was planning to keep the width to 8", however, while working on my cad design, i've found that I can not keep the 8". The sub has a mounting depth 5 13/16, so to keep the end of the sub off the wood, I'm making that 6". Using 3/4 MDF, I've only got .5" between the sub mounting surface and the opposing wall. Problem is the xmax of the sub is ~.55". So I am pushing the opposing wall out .5", as I am constrained on the mounting surface. This will make the whole console 8.5", but it will give me 1" gap from the sub mounting surface to the opposing wall, .45" between xmax and the opposing wall.

The sub is an Infinity Kappa Perfect 10.1

The question is, is 1" enough? There will be more to the console that the port will expand into.

This picture may help understand what I mean.

OscarS · 10th February 2013, 05:42 PM

would help if the picture worked

weltersys · 10th February 2013, 08:16 PM

Quote:

Originally Posted by lonesouth

I Using 3/4 MDF, I've only got .5" between the sub mounting surface and the opposing wall. Problem is the xmax of the sub is ~.55".

The question is, is 1" enough?

If 1" is more than Xlim or Xmech, it is plenty.
If less, not so good, but you will be able to hear when the cone exceeds Xmax

.

lonesouth · 10th February 2013, 08:54 PM

Quote:

Originally Posted by OscarS

would help if the picture worked

DOH!

Now I feel like a noob. Fixed the picture and added a link to the sub.

Thanks.

Patrick Bateman · 11th February 2013, 04:40 AM

Instead of doing a bandpass, I'd simply do a slot loaded box.
Due to your tight space, it's going to be hard to squeeze the front chamber and the port into that space.

If you're trying to protect the sub from damage, slot loading will work well. Keep in mind that slot loading will limit your bandwidth, but as long as the volume of air in the slot is small, you should be good up to 200 or even 400hz.

10th February 2013, 01:16 PM	#1
lonesouth diyAudio Member Join Date: Nov 2009	Short bandpass I'm designing a center console for my early bronco and wanted to incorporate a sub. I decided on a bandpass as a way to protect the sub from sticks, branches, elbows, etc, but am starting to question if I have enough room. I was planning to keep the width to 8", however, while working on my cad design, i've found that I can not keep the 8". The sub has a mounting depth 5 13/16, so to keep the end of the sub off the wood, I'm making that 6". Using 3/4 MDF, I've only got .5" between the sub mounting surface and the opposing wall. Problem is the xmax of the sub is ~.55". So I am pushing the opposing wall out .5", as I am constrained on the mounting surface. This will make the whole console 8.5", but it will give me 1" gap from the sub mounting surface to the opposing wall, .45" between xmax and the opposing wall. The sub is an Infinity Kappa Perfect 10.1 The question is, is 1" enough? There will be more to the console that the port will expand into. This picture may help understand what I mean. Last edited by lonesouth; 10th February 2013 at 08:53 PM.

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10th February 2013, 05:42 PM	#2
OscarS diyAudio Member Join Date: Jan 2011	would help if the picture worked

11th February 2013, 04:40 AM	#5
Patrick Bateman diyAudio Member Join Date: Oct 2006	Instead of doing a bandpass, I'd simply do a slot loaded box. Due to your tight space, it's going to be hard to squeeze the front chamber and the port into that space. If you're trying to protect the sub from damage, slot loading will work well. Keep in mind that slot loading will limit your bandwidth, but as long as the volume of air in the slot is small, you should be good up to 200 or even 400hz.