subbass horn design

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   so i've been meaning to create my self a nice subwoofer horn for a home surround sound system. the drivers i used were a pair of Tang Band W8-740C which can be found on www.partsexpress.com. drivers are wired in series too compliant with a Dayton 500watt amp. 300watt rms between the two drivers but i only modeled 250watt as they are two 8" drivers hiting high 20s. spacing wise, it's in between 1/8 space and 1/4 space in the area that this will be used in according to the dimensions of the finished project. 

Sensetivity:
28hz-100hz flat 107db @ 1watt/1m *1/8 spacing* 
28hz-100hz -3db 103.5db @ 1watt/1m *1/4 spacing*
28hz-100hz -5db 100db @ 1watt/1m *1/2 spacing*

the white area  the images below is the intended response range that i will be using. you'll also notice that it's a big horn which will be perfectly fine because it's a big entertainment center . i'll probably be using a Sony 32" wega LCD TV to go with it so magnetic feilds wont bug the image quality . as sensetivity shows, inteded use will be 28hz-100hz.

Inputs:

Phase response:

1/8 space output with 250watt 8ohm 1w/1m:

1/4 space output with 250wat 8ohm 1w/1m:

1/2 space output with 250watt 8ohm 1w/1m:

Edited by NeverWinter - 10 December 2006 at 9:23pm

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Jay Lawless Members Profile Send Private Message Find Members Posts Add to Buddy List Old Croc Joined: 22 August 2005 Location: United States Status: Offline Points: 1702	Post Options Post Reply Quote Jay Lawless Report Post Thanks(0) Quote Reply Topic: subbass horn design Posted: 10 December 2006 at 9:21pm
	so i've been meaning to create my self a nice subwoofer horn for a home surround sound system. the drivers i used were a pair of Tang Band W8-740C which can be found on www.partsexpress.com. drivers are wired in series too compliant with a Dayton 500watt amp. 300watt rms between the two drivers but i only modeled 250watt as they are two 8" drivers hiting high 20s. spacing wise, it's in between 1/8 space and 1/4 space in the area that this will be used in according to the dimensions of the finished project. Sensetivity: 28hz-100hz flat 107db @ 1watt/1m 1/8 spacing 28hz-100hz -3db 103.5db @ 1watt/1m 1/4 spacing 28hz-100hz -5db 100db @ 1watt/1m 1/2 spacing the white area the images below is the intended response range that i will be using. you'll also notice that it's a big horn which will be perfectly fine because it's a big entertainment center . i'll probably be using a Sony 32" wega LCD TV to go with it so magnetic feilds wont bug the image quality . as sensetivity shows, inteded use will be 28hz-100hz. Inputs: Phase response: 1/8 space output with 250watt 8ohm 1w/1m: 1/4 space output with 250wat 8ohm 1w/1m: 1/2 space output with 250watt 8ohm 1w/1m: Edited by NeverWinter - 10 December 2006 at 9:23pm
	Previously known as NeverWinter Background: Automotive, Live and Home Custom Design. mid/high level based design and feild experience. Bass specialist

Jay Lawless Members Profile Send Private Message Find Members Posts Add to Buddy List Old Croc Joined: 22 August 2005 Location: United States Status: Offline Points: 1702	Post Options Post Reply Quote Jay Lawless Report Post Thanks(0) Quote Reply Posted: 11 December 2006 at 7:12am
	i've also been able to cut the size down by half. length stays about the same, but segments are half the size with F3 at 30hz instead of 28hz.
	Previously known as NeverWinter Background: Automotive, Live and Home Custom Design. mid/high level based design and feild experience. Bass specialist

Jeroen Members Profile Send Private Message Find Members Posts Add to Buddy List Registered User Joined: 11 December 2006 Status: Offline Points: 4	Post Options Post Reply Quote Jeroen Report Post Thanks(0) Quote Reply Posted: 11 December 2006 at 11:04am
	i have built something similar, but with a Visation TIW250XS woofer: Lots of fun watching movies! f3 : 28 Hz Edited by Jeroen - 11 December 2006 at 11:06am
	JVsound

Mark James Members Profile Send Private Message Find Members Posts Add to Buddy List Old Croc Joined: 15 January 2006 Location: rig side Status: Offline Points: 5309	Post Options Post Reply Quote Mark James Report Post Thanks(0) Quote Reply Posted: 11 December 2006 at 4:08pm
	plans???
	me so horny me love you long throw horn loaded for her pleasure

TDA-Audio Members Profile Send Private Message Find Members Posts Add to Buddy List Registered User Joined: 11 February 2005 Location: Russian Federation Status: Offline Points: 294	Post Options Post Reply Quote TDA-Audio Report Post Thanks(0) Quote Reply Posted: 11 December 2006 at 4:58pm
	super! spl/w/m ??? what driver? plans?

Jay Lawless Members Profile Send Private Message Find Members Posts Add to Buddy List Old Croc Joined: 22 August 2005 Location: United States Status: Offline Points: 1702	Post Options Post Reply Quote Jay Lawless Report Post Thanks(0) Quote Reply Posted: 11 December 2006 at 5:30pm
	an outrageously big C bin haha! nice work though!
	Previously known as NeverWinter Background: Automotive, Live and Home Custom Design. mid/high level based design and feild experience. Bass specialist

Jimbo Members Profile Send Private Message Find Members Posts Add to Buddy List Registered User Joined: 07 March 2005 Location: United States Status: Offline Points: 420	Post Options Post Reply Quote Jimbo Report Post Thanks(0) Quote Reply Posted: 11 December 2006 at 7:32pm
	@NeverWinter. That's a lot of path! Reading threw your post, you state "drivers are wired in series". Somebody correct me if I'm wrong, but I think that would only equal 150RMS. I also read somewhere that it can introduce some distoration. @Jeroen. With it painted it looks more like an ice box! Nice build! Jim

Jay Lawless Members Profile Send Private Message Find Members Posts Add to Buddy List Old Croc Joined: 22 August 2005 Location: United States Status: Offline Points: 1702	Post Options Post Reply Quote Jay Lawless Report Post Thanks(0) Quote Reply Posted: 11 December 2006 at 8:06pm
	alot of path, but the horn expansion isn't all that big and is very easy to manage after the mods i made. as for the RMS, that stands for amp output, not drivers. two 4ohm drivers wired in series to make for 8ohm to the amp and 300watt RMS rating though only 250watt at most will be seen. the horn it's self will be split in half after the first couple hundread centemeters so that each mouth fires off to the sides.
	Previously known as NeverWinter Background: Automotive, Live and Home Custom Design. mid/high level based design and feild experience. Bass specialist

Mark James Members Profile Send Private Message Find Members Posts Add to Buddy List Old Croc Joined: 15 January 2006 Location: rig side Status: Offline Points: 5309	Post Options Post Reply Quote Mark James Report Post Thanks(0) Quote Reply Posted: 12 December 2006 at 7:28am
	plans??? any uk drivers thatl work???? i can see a new home sterio for our lounge somewher
	me so horny me love you long throw horn loaded for her pleasure

Mark James Members Profile Send Private Message Find Members Posts Add to Buddy List Old Croc Joined: 15 January 2006 Location: rig side Status: Offline Points: 5309	Post Options Post Reply Quote Mark James Report Post Thanks(0) Quote Reply Posted: 12 December 2006 at 7:57am
	hmmm would it fit in a vw camper???? looking for a sub plan to play 30<100hz under some 6x9s for some silly in car entertainment.... please post plans!!!!!
	me so horny me love you long throw horn loaded for her pleasure

Jeroen Members Profile Send Private Message Find Members Posts Add to Buddy List Registered User Joined: 11 December 2006 Status: Offline Points: 4	Post Options Post Reply Quote Jeroen Report Post Thanks(0) Quote Reply Posted: 12 December 2006 at 8:48am
	It hits 110 dB at 30 Hz (2pi) and moves to 115 dB at 90 Hz (max simulated SPL). Required amp power: not more than 250 watts. Driver: Visaton TIW250XS (10") www.visaton.com Dimensions: 1651800430 (mm) Edited by Jeroen - 12 December 2006 at 8:53am
	JVsound

Dave Slater Members Profile Send Private Message Find Members Posts Add to Buddy List Registered User Joined: 28 February 2004 Location: United Kingdom Status: Offline Points: 373	Post Options Post Reply Quote Dave Slater Report Post Thanks(0) Quote Reply Posted: 12 December 2006 at 9:10am
	those tang bands are nice drivers i've been mucking around with a few designs for them myself got a 5.1 system in the pipeline as soon as funds allow centre and rear - CSS FR125S in sealed boxes mains - Adire Extremis 6.5 + CSS WR125S +unknown tweeter sub - Tang Band W8-740C in either a horn or BP6 behind my sofa all powered off gainclones - 56W/ch chip amp cloned off a japanese audiophile amp that originally sold for $2000 and DIY'd for about �100 per stereo amp the audio will be coming from an entertainment pc affair with a soundblaster running kx project software allowing me to crack the dsp and setup my own filters and eq etc