Richard Allan speakers. T-S parameters attached.

Ouroboros · 30th April 2004, 01:02 PM

T-S parameters of many of the old, but well-respected Richard Allan drive units.

Data just received from RA themselves.

Jonathan Bright · 1st May 2004, 06:24 AM

Dear Ouroboros, Thanks, very thoughtful. I own an HP12B 1979 vintage (not sure which Res. Fq. yet) It is going in a sub one day. I needed those specs. Jonathan Bright.

quasi · 23rd September 2005, 12:41 PM

Hi Ouroboros

I have been given a Richard Allan Atlas 15 so your specs are really useful. Do you have any information about it's power handling?

Regards
Quasi

AndrewT · 23rd September 2005, 04:13 PM

Hi,
I had a R.A. Pavane way back in '71/2. It was a 3way with a power handling for the whole including crossover of 25w from memory.
The CG12 in there would I guess handle about 15w (or maybe it was 12.5w) but it was very efficient. When replaced with Tannoy HPD385 (94db/w) in 100litre cabs the Pavane needed less voltage than the Tannoy for the same volume.
In those days manufacturers had only just started going down the route of using power to replace air inside the cabinet. Only recently have they started re-inventing the wheel to get impact and livelyness back into speakers.

googlyone · 20th January 2008, 08:30 AM

OK, this is a few years out of date, but I guess it is worth adding a snippet ehre...

The Richard Allan ATLAS speakers were quite high power for their time. The ATLAS-15 was the big brother of the HD-15. The HD-15 was 125Watts "RMS". The HD-15 used a 2 inch voice coil, and with music driven at these levels is a reliable driver.

The appilcation of the HD and ATLAS series was for PA use, though these drivers are of excellent quality, and more than applicable for hifi use. They have a surprisingly flat frequency response and low distortion even to fairly high levels.

1st May 2004, 06:24 AM	#2
Jonathan Bright diyAudio Member Join Date: Feb 2004 Location: Queensland	Dear Ouroboros, Thanks, very thoughtful. I own an HP12B 1979 vintage (not sure which Res. Fq. yet) It is going in a sub one day. I needed those specs. Jonathan Bright. __________________ "It was the Spring time of the year when aunt calls to aunt like mastodons across the frozen waste." P.G. Wodehouse.

23rd September 2005, 12:41 PM	#3
quasi diyAudio Member Join Date: Sep 2004 Location: Adelaide, Australia	Richard Allan Atlas 15 Hi Ouroboros I have been given a Richard Allan Atlas 15 so your specs are really useful. Do you have any information about it's power handling? Regards Quasi __________________ http://sites.google.com/site/quasisdiyaudiosite/

23rd September 2005, 04:13 PM	#4
AndrewT diyAudio Member Join Date: Jul 2004 Location: Scottish Borders	Hi, I had a R.A. Pavane way back in '71/2. It was a 3way with a power handling for the whole including crossover of 25w from memory. The CG12 in there would I guess handle about 15w (or maybe it was 12.5w) but it was very efficient. When replaced with Tannoy HPD385 (94db/w) in 100litre cabs the Pavane needed less voltage than the Tannoy for the same volume. In those days manufacturers had only just started going down the route of using power to replace air inside the cabinet. Only recently have they started re-inventing the wheel to get impact and livelyness back into speakers. __________________ regards Andrew T.

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20th January 2008, 08:30 AM	#5
googlyone diyAudio Member Join Date: Nov 2006 Location: Adelaide, South Australia Blog Entries: 5	OK, this is a few years out of date, but I guess it is worth adding a snippet ehre... The Richard Allan ATLAS speakers were quite high power for their time. The ATLAS-15 was the big brother of the HD-15. The HD-15 was 125Watts "RMS". The HD-15 used a 2 inch voice coil, and with music driven at these levels is a reliable driver. The appilcation of the HD and ATLAS series was for PA use, though these drivers are of excellent quality, and more than applicable for hifi use. They have a surprisingly flat frequency response and low distortion even to fairly high levels.

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