Help with modeling Titanic MK3 15" and Dayton 1000w plate amp

[jmillerdoc]

Hello,
I recently purchased a single Titanic MK3 15" sub, Dayton 1000w plate amp with parametric EQ, and a pair of Precision Port 4" ports.

I need some help modeling the best tradeoff between size and performance in a BR enclosure. My listening room is pretty large as it spreads out into the kitchen and dining, probably half of my floorspace of a 1900sqft house.

I was looking at a few other threads and saw about 6cuft was a god tradeoff but they didn't go into porting for this size.

I was thinking about making an 18"x18"x35" external dimension box using 1.5" MDF. That should be pretty close to the volume I need, I think.

Any help with adjustments to this size and of course porting using what I have on hand would be appreciated.

Just out of curiosity, what could I expect using a 16" internal dimension sealed cube with this sub and plate amp? Could it be EQ'd enough to get the bottom end below 30hz?

Thanks for your help!
Jeff

[Homeboydeluxe]

Hi there,

I did a quick model for you, with the dimensions you choose and wood thickness you are only getting around 4 cubic feet, not good for a ported design with this driver.

A 16" cube with 1.5" wall thickness is only 1.5 cubic feet, very small for a 15" driver, 8 cubic feet tuned to 23Hz looks pretty nice, you will need a HPF @20Hz and 3 four inch ports to keep port air speed down.

.75" walls will be ok as long as its well braced, maybe a 20" cube sealed might be a nice trade off, but i would make room for ported if i were you.

Orange is 8 cubic feet.
Grey is 4 cubic feet.
Yellow is 1.5 cubic feet.

HPF at 20Hz on both ported subs.

[bjorno]

Originally Posted by jmillerdoc

Hello,
I recently purchased a single Titanic MK3 15" sub, Dayton 1000w plate amp with parametric EQ,....Just out of curiosity, what could I expect using a 16" internal dimension sealed cube with this sub and plate amp? Could it be EQ'd enough to get the bottom end below 30hz?..Jeff

Hi Jeff,

A sealed enclosure would IMO be a good choice and of course a T-TQWT too.

b

[jmillerdoc]

Originally Posted by bjorno

Hi Jeff,

A sealed enclosure would IMO be a good choice and of course a T-TQWT too.

b

Bjorno,
I am having a hard time reading that pic, the resolution is poor on sizing it up. Can you give me the dimensions of the TWQT as well as driver placement and anticipated stuffing? I think I read on your picture that it tunes around 19hz at Fb?

What about using this woofer in an H frame open baffle? Can it work well? I recently listen to my first OB setup a few days ago at Danny Richy's place and the bass from the OB os truly amazing.

Jeff

[bjorno]

Originally Posted by jmillerdoc

Bjorno,
I am having a hard time reading that pic, the resolution is poor on sizing it up. Can you give me the dimensions of the TWQT as well as driver placement and anticipated stuffing? I think I read on your picture that it tunes around 19hz at Fb?

What about using this woofer in an H frame open baffle? Can it work well? I recently listen to my first OB setup a few days ago at Danny Richy's place and the bass from the OB os truly amazing.

Jeff

Hi Jeff,

First: Try to open the pictures in another window, click on the thumbnails,click on the lower left corner to magnify the pictures.

You can use the Titanic in a H frame OB but the possible SPL for sub frequencies would be far lower if compared.

Agree that OB-bass sounds good but compared with what?

If you play an OB speaker just below x-max and compare using the same driver in a T-TQWT equalized to copy the OB FR and levels , you will find the latter to have almost benign IMD/THD while the OB by definition would have at least 10% THD and much higher levels of IMD colorations.

You can look at the level differences in your next thread where I show a H-frame template simulation using the titanic driver.

b

b

[jmillerdoc]

Originally Posted by bjorno

Hi Jeff,

First: Try to open the pictures in another window, click on the thumbnails,click on the lower left corner to magnify the pictures.

You can use the Titanic in a H frame OB but the possible SPL for sub frequencies would be far lower if compared.

Agree that OB-bass sounds good but compared with what?

If you play an OB speaker just below x-max and compare using the same driver in a T-TQWT equalized to copy the OB FR and levels , you will find the latter to have almost benign IMD/THD while the OB by definition would have at least 10% THD and much higher levels of IMD colorations.

You can look at the level differences in your next thread where I show a H-frame template simulation using the titanic driver.

b

b

Ok, I think I got the dimensions but wanted you to verify.....the res was still a bit low.

18"x18"x35" (internal or external with ? Thick material??)
driver centered on bottom part of enclosure with vertical center at 10"

What about stuffing and where?

Thanks,
Jeff

[bjorno]

[QUOTE=jmillerdoc;2455076]

...the res was still a bit low..

? Maybe someone else can help you, I have no problem when looking at the pictures.

..18"x18"x35" (internal or external with ? Thick material??)
driver centered on bottom part of enclosure with vertical center at 10"..

The closed box external dimensions using 3/4" wood are: 18" x 18" x 35" and the driver is centered 10" from the bottom.

..What about stuffing and where?...

You need about 2lb = ~2kg stuffings(Polyfill) evenly distributed to cover the entire internal volume.

Ultimate Polyfill Subwoofer Enclosure Resource - AudioJunkies


b

[jmillerdoc]

Thanks, perfect.....not sure why I can't get those pics to show as sharp as you, maybe it's my old failing eyes. I can see most everything but the "8's" are hard to be sure.
Anyways, thanks...that enclosure is sealed or open somewhere? Didn't see where the ports would be called for, maybe I am not looking hard enough. It's not too big and that's good, didn't want a monster of a piece of furniture the wife would fuss about.
Thanks again for your help.
Jeff

[jmillerdoc]

Oh, I see now at the very top....closed transmission line enclosure.....
Thanks,
Jeff

[bjorno]

Originally Posted by jmillerdoc

Oh, I see now at the very top....closed transmission line enclosure.....
Thanks,
Jeff

Yes, If a closed transmission line is made compact it really behaves as an ordinary closed box but when simulated you have control over the stuffings opposed to all the simpler simulation programs used here at DIYaudio.

b