Horn enclosure for Altec 604 Coaxial

ericimage · 31st May 2004, 04:26 PM

Hello,
I'm designing a horn cabinet for a pair of new 604-8k.

Please take a look at the Image attached and please post your comment, this is only a concept I'm not really sure how it would sound or if it will be better than a bass reflex enclosure.

Sincerely

Eric

ericimage · 31st May 2004, 04:31 PM

There is the pic

GrahamnDodder · 31st May 2004, 07:21 PM

Wouldn't you need a more defined compression chamber?

I like that it is non parallel, but the transition from the compression chamber to the throat of the horn would have to be more abrupt, no?

GND

BillFitzmaurice · 31st May 2004, 08:47 PM

The concept is fine but you don't need to go to the trouble of using curved surfaces with a rear loaded horn. Curved bends are critical to smooth response above 300-400 Hz or so, but those aren't the frequencies that your horn will be passing. With the long wavelengths that the rear loaded horn passes curved surfaces are of no advantage. They don't hurt, but they don't help either.

ericimage · 31st May 2004, 10:03 PM

I’m using it curved because I'm planning to build the enclosure in MDF layers and sandwich them together the only problem will be the weight.

BillFitzmaurice · 1st June 2004, 02:23 AM

That's fine. although you may find bending MDF a major chore. Curved surfaces have the advantage of being very vibration resistant, but you still may find the effort not worth the benefit.

GM · 1st June 2004, 04:44 AM

>Wouldn't you need a more defined compression chamber?

I like that it is non parallel, but the transition from the compression chamber to the throat of the horn would have to be more abrupt, no?
====
For the appropriate BW, no, no. What matters is net Vb, St. That said, if the drawing is reasonably accurate, the rear chamber is much too large, St too small, and the pathlength way too short to perform well. Better to stick it in a tweaked 825/828 design, or probably best, a chopped down 210/211 with a 416 helper woofer. A pair of these would suffice for an art house cinema.

GM

ericimage · 1st June 2004, 01:31 PM

where can I find the 825/828 design and the 210/211 design

GM · 1st June 2004, 03:01 PM

http://www.lansingheritage.org/html/...970s-plans.htm

GM

31st May 2004, 04:26 PM	#1
ericimage diyAudio Member Join Date: May 2004 Location: Ocala, FL	Horn enclosure for Altec 604 Coaxial Hello, I'm designing a horn cabinet for a pair of new 604-8k. Please take a look at the Image attached and please post your comment, this is only a concept I'm not really sure how it would sound or if it will be better than a bass reflex enclosure. Sincerely Eric

31st May 2004, 07:21 PM	#3
GrahamnDodder diyAudio Member Join Date: Jun 2003 Location: Near Baltimore, MD	Wouldn't you need a more defined compression chamber? I like that it is non parallel, but the transition from the compression chamber to the throat of the horn would have to be more abrupt, no? GND __________________ I had the right to remain silent. I just didn't have the ability. (Comedian Ron White)

1st June 2004, 04:44 AM	#7
GM diyAudio Member Join Date: Jun 2003 Location: Chamblee, Ga.	>Wouldn't you need a more defined compression chamber? I like that it is non parallel, but the transition from the compression chamber to the throat of the horn would have to be more abrupt, no? ==== For the appropriate BW, no, no. What matters is net Vb, St. That said, if the drawing is reasonably accurate, the rear chamber is much too large, St too small, and the pathlength way too short to perform well. Better to stick it in a tweaked 825/828 design, or probably best, a chopped down 210/211 with a 416 helper woofer. A pair of these would suffice for an art house cinema. GM __________________ Loud is Beautiful if it's Clean! As always though, the usual disclaimers apply to this post's contents.

1st June 2004, 03:01 PM	#9
GM diyAudio Member Join Date: Jun 2003 Location: Chamblee, Ga.	http://www.lansingheritage.org/html/...970s-plans.htm GM __________________ Loud is Beautiful if it's Clean! As always though, the usual disclaimers apply to this post's contents.

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


	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

31st May 2004, 08:47 PM	#4
BillFitzmaurice Banned Join Date: May 2004 Location: New Hampshire	The concept is fine but you don't need to go to the trouble of using curved surfaces with a rear loaded horn. Curved bends are critical to smooth response above 300-400 Hz or so, but those aren't the frequencies that your horn will be passing. With the long wavelengths that the rear loaded horn passes curved surfaces are of no advantage. They don't hurt, but they don't help either.

31st May 2004, 10:03 PM	#5
ericimage diyAudio Member Join Date: May 2004 Location: Ocala, FL	I’m using it curved because I'm planning to build the enclosure in MDF layers and sandwich them together the only problem will be the weight.

1st June 2004, 02:23 AM	#6
BillFitzmaurice Banned Join Date: May 2004 Location: New Hampshire	That's fine. although you may find bending MDF a major chore. Curved surfaces have the advantage of being very vibration resistant, but you still may find the effort not worth the benefit.

1st June 2004, 01:31 PM	#8
ericimage diyAudio Member Join Date: May 2004 Location: Ocala, FL	where can I find the 825/828 design and the 210/211 design

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

Similar Threads
Thread	Thread Starter	Forum	Replies	Last Post
What is This cabinet enclosure? Altec?	superjunk	Multi-Way	0	21st April 2009 03:14 PM
Karlson enclosure for Altec 416z	theophile	Multi-Way	6	15th August 2007 03:53 AM
Which enclosure for Altec 409-8B	edlye	Full Range	31	7th July 2007 03:11 PM
Hedlund Horn / Coaxial ??	jcmjrt	Multi-Way	0	29th December 2006 10:31 PM
Coaxial altec/jbl/jensen/etc for 2'' CD??	cathode_leak	Multi-Way	6	6th June 2005 05:56 PM

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