Help with driver choice.

unitgain · 2nd March 2004, 04:09 PM

I'm totally new to this DIY stuff. Please bear with this newbie.

I want to build a subwoofer (wow, how original) and pretty much the only reasonable drivers I can find are these:

1. KEF B139 plus a matching passive radiator
2. Shiva MkIII

The price for both units is the same. Which would be the best choice, and in what enclosure?

Thanks!

sreten · 2nd March 2004, 04:22 PM

Utterly no contest, at all.

The B139 does not make a good sub, especially a PR one.

I can't find the Mkiii specs as yet but I be very surprised if they
were not vastly more suited to a sub. will keep you posted,
but I believe the Shiva suits around a 50L sealed box and a
100L to 150L reflexed / vented box.

Just can't find the parameters.

sreten.

unitgain · 2nd March 2004, 04:29 PM

KEFs are used in the Perfectionist Audio subwoofer and a number of other respectable designs, that's why I didn't dismiss this unit out of hand. All of them are TL designs without the PR though (but then there's always an option to ditch the PR...)

Timn8ter · 2nd March 2004, 04:55 PM

Shiva MkIV specs shouldn't be different from the MkIII.

Re 2.9 ohms
Le 2.12 mH
Qms 6.5
Mms 125 grams
Qes 0.40
Cms 0.47 mm/N
Qts 0.38
Rms 2.54 N*s/m
Fs 21 Hz
Sd 481 cm^2
Vas 151 liters
BL 11.30
Xmax 16.6 mm one way
EBP 51
SPL 87.3 dB @ 1W/1m
No 0.37%
Pmax 375W per voice coil; 650W total to the driver

The Perfectionist Sub looks a lot like this one. Maybe 'cuz it's the same design based on the Fried Model H sub.

sreten · 2nd March 2004, 05:34 PM

THe B139 specs are here :
http://homepage.mac.com/tlinespeaker...139B_newer.gif

I don't think its much of a contest.

Details of designs and boxes for the shiva can be found here :

http://www.adireaudio.com/tech_papers/shiva_apps.htm

sreten.

5th element · 2nd March 2004, 10:18 PM

The shivas xmax is more then four times the kefs, alsmost 5 times! I know that old kef driver is/was highly regarded, but nowadays it just cant keep up.

2nd March 2004, 04:09 PM	#1
unitgain diyAudio Member Join Date: Jan 2004 Location: northern israel	Help with driver choice. I'm totally new to this DIY stuff. Please bear with this newbie. I want to build a subwoofer (wow, how original) and pretty much the only reasonable drivers I can find are these: 1. KEF B139 plus a matching passive radiator 2. Shiva MkIII The price for both units is the same. Which would be the best choice, and in what enclosure? Thanks!

2nd March 2004, 10:18 PM	#6
5th element diyAudio Member Join Date: Oct 2002 Location: England	The shivas xmax is more then four times the kefs, alsmost 5 times! I know that old kef driver is/was highly regarded, but nowadays it just cant keep up. __________________ What the hell are you screamin' for? Every five minutes there's a bomb or somethin'! I'm leavin! bzzzz! Droggon Attack!

Thread Tools	Search this Thread
Show Printable Version Email this Page	Search this Thread: Advanced Search

Similar Threads
Thread	Thread Starter	Forum	Replies	Last Post
tri-amped driver choice	13814044	Multi-Way	6	6th February 2008 06:37 PM
Bass guitar driver choice	bremen nacht	Multi-Way	9	14th April 2007 05:03 PM
Driver choice - Dayton or B&C in Singapore?	MBK	Multi-Way	3	6th November 2006 02:51 PM
Choice of driver for El Pipe-O	Nicwix	Multi-Way	14	1st July 2003 09:18 PM
Choice of driver for El Pipe-O	Nicwix	Pass Labs	3	16th June 2003 04:40 AM

New To Site?	Need Help?
Register to Participate Search Privacy Statement Contact Us	Frequently Asked Questions Did you forget your password? Mark Forums Read


	Please consider donating to help us continue to serve you. Ads on/off / Custom Title / More PMs / More album space / Advanced printing & mass image saving

2nd March 2004, 04:22 PM	#2
sreten diyAudio Member Join Date: Nov 2003 Location: Brighton UK	Utterly no contest, at all. The B139 does not make a good sub, especially a PR one. I can't find the Mkiii specs as yet but I be very surprised if they were not vastly more suited to a sub. will keep you posted, but I believe the Shiva suits around a 50L sealed box and a 100L to 150L reflexed / vented box. Just can't find the parameters. sreten.

2nd March 2004, 04:29 PM	#3
unitgain diyAudio Member Join Date: Jan 2004 Location: northern israel	KEFs are used in the Perfectionist Audio subwoofer and a number of other respectable designs, that's why I didn't dismiss this unit out of hand. All of them are TL designs without the PR though (but then there's always an option to ditch the PR...)

2nd March 2004, 04:55 PM	#4
Timn8ter diyAudio Member Join Date: Jul 2003 Location: Seattle, WA	Shiva MkIV specs shouldn't be different from the MkIII. Re 2.9 ohms Le 2.12 mH Qms 6.5 Mms 125 grams Qes 0.40 Cms 0.47 mm/N Qts 0.38 Rms 2.54 N*s/m Fs 21 Hz Sd 481 cm^2 Vas 151 liters BL 11.30 Xmax 16.6 mm one way EBP 51 SPL 87.3 dB @ 1W/1m No 0.37% Pmax 375W per voice coil; 650W total to the driver The Perfectionist Sub looks a lot like this one. Maybe 'cuz it's the same design based on the Fried Model H sub.

2nd March 2004, 05:34 PM	#5
sreten diyAudio Member Join Date: Nov 2003 Location: Brighton UK	THe B139 specs are here : http://homepage.mac.com/tlinespeaker...139B_newer.gif I don't think its much of a contest. Details of designs and boxes for the shiva can be found here : http://www.adireaudio.com/tech_papers/shiva_apps.htm sreten.

Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)