Okay...ready to build a new enclosure...need to some tips.

[Whitey80]

Have a Dayton Titanic MKIII 15" currently....considering building a large vented enclosure now to up the output slightly for the theater.

Based on the driver (which I do not have specs for) and the HPSA1000 plate amp that I have with it, what is going to be the ideal dimensions to tune for very low frequency?

 

[GranteedEV]

Very large extended bass shelf tuned just about at the drivers resonant frequence. Bear in mind that this is a sound quality type ported box so it wont have much punch but shouls be capable of nice overall output and minimal ringing

 

[GranteedEV]

I went and modeled the sub for you with the 18hz 3rd order HPF on the amp.

Here's what I would probably build

300 L box
12" x 6" x 39" slot port for a 20 hz tuning

You might go slightly over xmax at the most extreme transients below and above the tuning frequency. Just try to listen 2-4 db below reference and you'll be fine.

One thing I would certainly do is EQ down any measured room gain and modes.

 

[dkane360]

I think this is the driver:
http://www.parts-express.com/pe/showdetl.cfm?Partnumber=295-420

I would remove the driver from the enclosure it's in now and check to be sure though.

 

[Whitey80]

I went and modeled the sub for you with the 18hz 3rd order HPF on the amp.

Here's what I would probably build

300 L box
12" x 6" x 39" slot port for a 20 hz tuning

You might go slightly over xmax at the most extreme transients below and above the tuning frequency. Just try to listen 2-4 db below reference and you'll be fine.

One thing I would certainly do is EQ down any measured room gain and modes.

Thanks an absolute ton Granteed, I really appreciate it.

In theory, will this sound much different that the current sealed box that it already came in? What will be the benefits/drawbacks of the new design

I think this is the driver:
http://www.parts-express.com/pe/showdetl.cfm?Partnumber=295-420

I would remove the driver from the enclosure it's in now and check to be sure though.

Thats the one. I pulled it and checked.

 

[GranteedEV]

P

Thanks an absolute ton Granteed, I really appreciate it.

In theory, will this sound much different that the current sealed box that it already came in? What will be the benefits/drawbacks of thed.

It's not as large and low tuned as i would have liked because of the high driver fs and fixed high pass filter. It definitely wont be as dry and tactile as a properly designed ported box using an lms-r or tempest x2 iumo. eqing flat to you room is very important. The box i suggested would actually start to rise in lower bass response in anything but the largest rooms which is undesirable. Ideally you want a natural rolloff so that it matches room gain.

I do think you would experience a a change in sq. i know nothing about the original box so i cant comment further.

 

[lsiberian]

P

It's not as large and low tuned as i would have liked because of the high driver fs and fixed high pass filter. It definitely wont be as dry and tactile as a properly designed ported box using an lms-r or tempest x2 iumo. eqing flat to you room is very important. The box i suggested would actually start to rise in lower bass response in anything but the largest rooms which is undesirable. Ideally you want a natural rolloff so that it matches room gain.

I do think you would experience a a change in sq. i know nothing about the original box so i cant comment further.

It would still be better than most commercial offerings. SQ and SPL wise.

 

[GranteedEV]

It would still be better than most commercial offerings. SQ and SPL wise.

I still wonder what other types of boxes this driver could work well in.

 

[Whitey80]

I still wonder what other types of boxes this driver could work well in.

Its currently in the sealed box which came in its kit from parts express. 20x20x20 http://www.parts-express.com/pe/showdetl.cfm?Partnumber=300-764

 

[Whitey80]

Ive also found out that I can easily shift hpf down to 12hz with a capacitor changeout on the preamp board.

 

[Whitey80]

Granteed...
The space it's in currently is definitely too small for that, but will be moving mid-january, and the space it will go in is 18x30 with 20ft ceiling, so definitely need the extra output.

 

[lsiberian]

Granteed...
The space it's in currently is definitely too small for that, but will be moving mid-january, and the space it will go in is 18x30 with 20ft ceiling, so definitely need the extra output.

The folded slot port will give you the greatest output outside of a horn loaded build.