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Old 29th March 2002, 06:38 AM   #1
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Question Sub Design?

Hi,

This is my first post so take it easy.... I would like to build a second sub to add to my current home theater system, (B&W DM300 series - front ,center, surrrounds and asw500 sub. Denon 1802 recvr.)

I am thinking of using the Dayton 12" Titanic MKII in a vented box , EBS.
The white paper posted for the MKII Vented gives the following:
Box Volume 4.83 ft3
Fb 19.47 hz.
Vent 4"D x 15.2" L

Anechoic Response
F3 21.43 hz
F10 15.1 hz
Output @ 20hz - 101.5db

Typical In-room response
F3 13.7
F 10 11.0hz
Output @20hz- 119 db


I am planning to use Model 50-6281 250 watt sub amp from MCM Electronics and use Sonotube for the enclosure with MDF top and bottom.

I used the Sonosub Construction Kit software to calculate .
The software says the 24" Sonotube will be 21.78" and the port will need to be 4"by 15.2"

This will be my first DIY speaker project and I would like some opinions or suggestions. I'm not a true audiophile but I am slowly learning.

Please let me know if I'm on the right track or out in left field.

Thank you.
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Old 29th March 2002, 07:55 AM   #2
griff is offline griff  Australia
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a similar project worth considering would be the 12" Shiva
http://www.adireaudio.com/Files/Vent...plications.PDF
page 20-24 is the project i refer too directly

im in the process of building one now, ive heard some wicked reviews on it though, ill let you know.
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Old 30th March 2002, 07:34 AM   #3
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The Shiva looks great. How close are you? Any pictures?

I ordered the amp from MCM yesterday. Not sure how long that will take, but I won't be able to get started for a couple of weeks anyway. If I don't decide on the speaker ,it may be a little longer.


Keep me updated on your progress....


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Old 30th March 2002, 08:27 AM   #4
griff is offline griff  Australia
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getting close. ill post complete pictorial when is complete, hopefully soon after my bookshelves are done.
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Old 30th March 2002, 02:28 PM   #5
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How some details on the bookshelves?????
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Old 1st April 2002, 06:54 AM   #6
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Default vents

Griff, howdy.
With the 142.5ltr vented shiva are u using flared ports, if so where did u get them from?
Im going build the 85ltr vented shiva but cant find the flared ports in australia, so I was thinking of making the box with a slot port any ideas?
Whats the go with correction factor on slot ports? something about friction of the air in the port?how do u work it out?I use Winisd which doesnt factor this in I've heard?
help!
thanks Rolfy72
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Old 1st April 2002, 07:06 AM   #7
griff is offline griff  Australia
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Slot port isnt really the way to go, from what ive heard if u dont stick to the plans pretty accurately then they will turn out a little less then anticipated.

There is a place in Melbourne that can do the Flared port and they have another nice trick that you might be interested in, i am looking for the same ports and i am going in tomorrow to pick up my SEAS drivers and looking at the ports. I will get pricing etc for you and be back in a day.
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Old 1st April 2002, 07:07 AM   #8
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Thanks keep us posted!
What is wrong with slot ports?
I've built a few car enclosures with slots and they work well, apparently if u dont use the correcting factor the port is tuned lower than estimated by Winisd/speaker simulators?(that's not bad is it, unless u are tuning really low)
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Old 1st April 2002, 07:25 AM   #9
griff is offline griff  Australia
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the only problem i would have is that it is untested with this particular system, and the flared ports are available so y not use them.
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Old 3rd April 2002, 04:58 AM   #10
griff is offline griff  Australia
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this is a stupid question i know, but i need it answered non the less.

can i have ported speakers with a sealed sub?

(sorry, having a mental blank here)
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