Rex Baldock's Paraline Speakers

atnaat · 14th October 2012, 01:22 PM

Does anybody have the plans Rex Baldock's Paraline speakers? All I can find in google is a miniscule thumbnail of a cutaway. All I know is that they were published in an issue of Hi Fi News in the 60's. Anyone?

bappe · 14th October 2012, 01:36 PM

I do, but only a hardcopy at home and i´m on a trip at the moment. I will check this thread when I get home on the 22nd and if you are still looking for i can scan and post it for you.

BR,
Anders

talaerts · 14th October 2012, 01:47 PM

Best I could find, but not enough to make it:

It's interesting that the front panel is angled. Otherwise it looks fairly standard.

I don't use Martin King's calculation sheets myself, does anyone know if they can handle an angled front panel? Would be interesting to see the effect.

Scottmoose · 14th October 2012, 03:09 PM

It was done that way because most of the contemporary units -Lowthers, Wharfedales etc - needed to be listened to off-axis. The original Lowther-Voigt corner-horn is another example where you have indirect radiation to take the massive midrange peak inherent to the drivers down somewhat. Granted, you lost the top end too (>12KHz), but since most broadcasts & many recordings from the generation these drivers were designed in didn't have any in the first place, this wasn't much of an issue.

Bob Brines · 14th October 2012, 04:00 PM

That's reminiscent of the Kef coffin sub.

Bob

Scottmoose · 14th October 2012, 04:18 PM

I imagine there was some inspiration in there somewhere, direct or otherwise.

GM · 14th October 2012, 06:59 PM

Nice BIB adaptation!

GM

Scottmoose · 14th October 2012, 07:16 PM

Guess you weren't the only one building big tapered pipes back in the day then Greg.

GM · 14th October 2012, 07:39 PM

Hardly! I got my first 'taste' cloning Jensen's awesome 1952 TL 'sub' [tapped, though didn't understand the concept at the time] that led me to finding Voigt's patent among others, so it seems reasonable that it and Voigt's designs stoked many folk's imagination also:

GM

planet10 · 14th October 2012, 08:41 PM

I am building up a pdf of scans from a welsh/portuguese member that includes this design.

dave

14th October 2012, 01:22 PM	#1
atnaat diyAudio Member Join Date: Jun 2005 Location: Cardiff	Rex Baldock's Paraline Speakers Does anybody have the plans Rex Baldock's Paraline speakers? All I can find in google is a miniscule thumbnail of a cutaway. All I know is that they were published in an issue of Hi Fi News in the 60's. Anyone?

14th October 2012, 06:59 PM	#7
GM diyAudio Member Join Date: Jun 2003 Location: Chamblee, Ga.	Nice BIB adaptation! GM __________________ Loud is Beautiful if it's Clean! As always though, the usual disclaimers apply to this post's contents.

14th October 2012, 08:41 PM	#10
planet10 frugal-phile(tm) diyAudio Moderator Join Date: Oct 2001 Location: Victoria, BC, NA, Sol III Blog Entries: 5	I am building up a pdf of scans from a welsh/portuguese member that includes this design. dave __________________ community sites t-linespeakers.org, frugal-horn.com, frugal-phile.com ........ commercial site planet10-HiFi p10-hifi forum here at diyA

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14th October 2012, 01:36 PM	#2
bappe diyAudio Member Join Date: Sep 2002 Location: Furulund, SWEDEN	I do, but only a hardcopy at home and i´m on a trip at the moment. I will check this thread when I get home on the 22nd and if you are still looking for i can scan and post it for you. BR, Anders

14th October 2012, 01:47 PM	#3
talaerts diyAudio Member Join Date: Oct 2005	Best I could find, but not enough to make it: It's interesting that the front panel is angled. Otherwise it looks fairly standard. I don't use Martin King's calculation sheets myself, does anyone know if they can handle an angled front panel? Would be interesting to see the effect.

14th October 2012, 03:09 PM	#4
Scottmoose diyAudio Member Join Date: Mar 2005 Location: UK	It was done that way because most of the contemporary units -Lowthers, Wharfedales etc - needed to be listened to off-axis. The original Lowther-Voigt corner-horn is another example where you have indirect radiation to take the massive midrange peak inherent to the drivers down somewhat. Granted, you lost the top end too (>12KHz), but since most broadcasts & many recordings from the generation these drivers were designed in didn't have any in the first place, this wasn't much of an issue.

14th October 2012, 04:00 PM	#5
Bob Brines diyAudio Member Join Date: Jan 2003 Location: Hot Spring Village AR	That's reminiscent of the Kef coffin sub. Bob

14th October 2012, 04:18 PM	#6
Scottmoose diyAudio Member Join Date: Mar 2005 Location: UK	I imagine there was some inspiration in there somewhere, direct or otherwise.

14th October 2012, 07:16 PM	#8
Scottmoose diyAudio Member Join Date: Mar 2005 Location: UK	Guess you weren't the only one building big tapered pipes back in the day then Greg.

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