Jensen BLH

Zene Gillette · 5th February 2012, 10:07 AM

Hi ... I have been looking at building this old Jensen corner horn. Would HornResp, ironing out the kinks, be better than trusting the engineers at Jensen to know what they were doing? The common chamber behind the vee is quite large. Most of this type (Jubilees, etc.) are made with divider. I do tend to like open as a pressure equalizer, but?
Thanks, Zene

Scottmoose · 5th February 2012, 10:21 AM

I think you can take it that the engineers at Jensen knew what they were doing.

There wasn't a whole lot the pioneers of audio from the '30s onward didn't do. This is a fairly simple design from, if memory serves, Jensen's own Tech. Bulletin No.3 (aping Altec's famous Technical Letters).

Couple of thoughts: that box was designed for contemporary 12in to 15in drive units, be they full-range, co/triaxial or woofer. Typically, we're talking units with high efficiency and equally high Vas here, so on both counts, it needs to be big.

Zene Gillette · 5th February 2012, 11:06 AM

Scottmoose ... Just want to make sure I spoke with straight tongue. Pic shows area I was referring to. Zene

Scottmoose · 5th February 2012, 01:24 PM

There looks to be a slight expansion discontinuity, which would show up on the impedance plot. I doubt it'd be a big deal though, & will help with the low-pass effect. If it really bothers you, you could put a front-rear partition in. I suspect I'd just leave it alone on the basis that life is too short.

Zene Gillette · 5th February 2012, 02:11 PM

Scottmoose ... thx for explaination. I agree to leave alone. I've built Khorns and LaScalas and they are not easy for anyone that wants to try. Now, where is my 50 year old drawing equipment? Zene

Bigun · 5th February 2012, 04:33 PM

Zene,

I thought you might find this of interest too.

DECWARE CORNER HORNS

spkrman57 · 5th February 2012, 04:45 PM

If I ever get enough room to use these in some corners I have the 12" version and will find out some day how well they work. I just have hoarded too much spkr cabs over the years and it has killed my available space.

I'm hoping this spring to rectify that situation and post the results on this forum.

Regards, Ron

planet10 · 5th February 2012, 05:07 PM

If you search there is another thread on this horn.

dave

5th February 2012, 04:33 PM	#6
Bigun diyAudio Member Join Date: Jan 2009 Location: K-W Ontario Blog Entries: 2	Zene, I thought you might find this of interest too. DECWARE CORNER HORNS __________________ "The test of the machine is the satisfaction it gives you. There isn't any other test. If the machine produces tranquility it's right. If it disturbs you it's wrong until either the machine or your mind is changed." Robert M Pirsig.

5th February 2012, 04:45 PM	#7
spkrman57 diyAudio Member Join Date: Sep 2007 Location: Columbus Ohio	If I ever get enough room to use these in some corners I have the 12" version and will find out some day how well they work. I just have hoarded too much spkr cabs over the years and it has killed my available space. I'm hoping this spring to rectify that situation and post the results on this forum. Regards, Ron __________________ Tubes and horns - JBL pro for home use!

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5th February 2012, 10:21 AM	#2
Scottmoose diyAudio Member Join Date: Mar 2005 Location: UK	I think you can take it that the engineers at Jensen knew what they were doing. There wasn't a whole lot the pioneers of audio from the '30s onward didn't do. This is a fairly simple design from, if memory serves, Jensen's own Tech. Bulletin No.3 (aping Altec's famous Technical Letters). Couple of thoughts: that box was designed for contemporary 12in to 15in drive units, be they full-range, co/triaxial or woofer. Typically, we're talking units with high efficiency and equally high Vas here, so on both counts, it needs to be big.

5th February 2012, 01:24 PM	#4
Scottmoose diyAudio Member Join Date: Mar 2005 Location: UK	There looks to be a slight expansion discontinuity, which would show up on the impedance plot. I doubt it'd be a big deal though, & will help with the low-pass effect. If it really bothers you, you could put a front-rear partition in. I suspect I'd just leave it alone on the basis that life is too short.

5th February 2012, 02:11 PM	#5
Zene Gillette diyAudio Member Join Date: Jan 2004 Location: Washington State	Scottmoose ... thx for explaination. I agree to leave alone. I've built Khorns and LaScalas and they are not easy for anyone that wants to try. Now, where is my 50 year old drawing equipment? Zene

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