Jensen Imperial plans

\\\\\The GSA'S Waldorf is using the same plans as RLA's after Long's death.\\\\\

wery good sound from GSA scoop!!!

yes -simple imperial still

horns plans http://photofile.ru/users/tda-audio/

jensen imperial quad design.

Support the scoop technology, larger mouth plays louder!

I think this would be an earlier generation of the Jensen Imperial.

And looking at the RLA design as produced by GSA, it seems the later design was retained for twin drivers. Look at the port on the ceiling. I wonder if the empty volume was used. Less compression (slower bass) but deeper bass would be the gain.

Edited by Lee In Montreal - 10 April 2011 at 10:54pm

\\\\Look at the port on the ceiling.\\\\

cut for magnet (deep fraime driver)

horns plans http://photofile.ru/users/tda-audio/

This copy of Jensen Imperial used to be in Jamaica, belonging to King Tubby, most likely not in his studio, but in his "Sound Systems". It was auctioned off on Ebay a couple of months ago. Those who are into reggae and dub most likely understand who King Tubby was... The others, keep on playing MP3s... ;-)

I have just built 6 half imperials, whilst they play low they produce a fairly even and balanced sound between 30 and 500 hz. The phase dip is much much less pronounced than on modern scoop designs, i'd argue it acts more like an average size reflex box with a huge flared port than a modern small chamber long horn type design.

I've wanted to build some of these for years which is strange considering my general dislike of scoops and the typical scoop sound.

My view is that modern scoops have been fixed and fixed and fixed by a number of people since the early days of king tubby using them.

sometimes you have to build something to find out if the original was broken in the first place.

Uploaded with ImageShack.us

Had them out for their inaugural outing on friday at a night playing a variety of hardcore/gabba/hardtek type stuff and they certainly didn't dissapoint.

very bangy but also hitting the low notes when required. we were crossing them to the hornloaded 8's at around 500hz.

have also tried them in 'classic oldschool reggae system mode' i.e. fullrange with a piezo on'th top and even that sounded fairly acceptable ;)

music is god

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Lee In Montreal Members Profile Send Private Message Find Members Posts Add to Buddy List Registered User Joined: 09 March 2011 Location: Montreal Status: Offline Points: 345	Post Options Post Reply Quote Lee In Montreal Report Post Thanks(0) Quote Reply Topic: Jensen Imperial plans Posted: 10 April 2011 at 5:53pm
	The Jensen Imperial cabinet was the model on which Richard Long based his 4520-looking Waldorf. The GSA'S Waldorf is using the same plans as RLA's after Long's death.

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: 10 April 2011 at 6:40pm
	\\\\\The GSA'S Waldorf is using the same plans as RLA's after Long's death.\\\\\ wery good sound from GSA scoop!!! yes -simple imperial still
	horns plans http://photofile.ru/users/tda-audio/

Lee In Montreal Members Profile Send Private Message Find Members Posts Add to Buddy List Registered User Joined: 09 March 2011 Location: Montreal Status: Offline Points: 345	Post Options Post Reply Quote Lee In Montreal Report Post Thanks(0) Quote Reply Posted: 10 April 2011 at 7:38pm
	Actually the Jensen design makes way more sense than the 4520-4530 layouts. The JBL designs have two 180° bends which cause massive havoc within the cabinets. While the Jensen design has only one 90° bend, which I am sure can be smoothed out as a nice curve, reducing problems. The Jensen design is such a simple idea. Also, in the Waldorf, one driver is used from 80Hz down, and the second driver isued 50Hz down for a strong thump.

JR.junior Members Profile Send Private Message Find Members Posts Add to Buddy List Old Croc Joined: 14 December 2009 Location: Slovenija Status: Offline Points: 1789	Post Options Post Reply Quote JR.junior Report Post Thanks(0) Quote Reply Posted: 10 April 2011 at 9:13pm
	jensen imperial quad design.
	Support the scoop technology, larger mouth plays louder!

subbass Members Profile Send Private Message Find Members Posts Add to Buddy List Old Croc Joined: 30 March 2009 Location: bristol Status: Offline Points: 1683	Post Options Post Reply Quote subbass Report Post Thanks(0) Quote Reply Posted: 10 April 2011 at 10:27pm
	woooooooooooooowowoo

Lee In Montreal Members Profile Send Private Message Find Members Posts Add to Buddy List Registered User Joined: 09 March 2011 Location: Montreal Status: Offline Points: 345	Post Options Post Reply Quote Lee In Montreal Report Post Thanks(0) Quote Reply Posted: 10 April 2011 at 10:32pm
	I think this would be an earlier generation of the Jensen Imperial. And looking at the RLA design as produced by GSA, it seems the later design was retained for twin drivers. Look at the port on the ceiling. I wonder if the empty volume was used. Less compression (slower bass) but deeper bass would be the gain. Edited by Lee In Montreal - 10 April 2011 at 10:54pm

rich, ind.st Members Profile Send Private Message Find Members Posts Add to Buddy List Young Croc Joined: 14 January 2005 Location: United Kingdom Status: Offline Points: 1096	Post Options Post Reply Quote rich, ind.st Report Post Thanks(0) Quote Reply Posted: 11 April 2011 at 12:34pm

	music is god

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 April 2011 at 6:57pm
	\\\\Look at the port on the ceiling.\\\\ cut for magnet (deep fraime driver)
	horns plans http://photofile.ru/users/tda-audio/

rich, ind.st Members Profile Send Private Message Find Members Posts Add to Buddy List Young Croc Joined: 14 January 2005 Location: United Kingdom Status: Offline Points: 1096	Post Options Post Reply Quote rich, ind.st Report Post Thanks(0) Quote Reply Posted: 11 April 2011 at 9:47pm
	back to the oldschool <grin> http://img848.imageshack.us/i/06042011142.jpg/ only got two of em loaded up to test so far (so effectively 1 standard imperial as we've cut 'em in half)... the adage of 'if it aint broken, don't fix it' is ringing very true.
	music is god

Lee In Montreal Members Profile Send Private Message Find Members Posts Add to Buddy List Registered User Joined: 09 March 2011 Location: Montreal Status: Offline Points: 345	Post Options Post Reply Quote Lee In Montreal Report Post Thanks(0) Quote Reply Posted: 03 May 2011 at 2:03am
	This copy of Jensen Imperial used to be in Jamaica, belonging to King Tubby, most likely not in his studio, but in his "Sound Systems". It was auctioned off on Ebay a couple of months ago. Those who are into reggae and dub most likely understand who King Tubby was... The others, keep on playing MP3s... ;-)

pfly Members Profile Send Private Message Find Members Posts Add to Buddy List Old Croc Joined: 25 October 2007 Location: Helsinki, Fin Status: Offline Points: 2828	Post Options Post Reply Quote pfly Report Post Thanks(0) Quote Reply Posted: 03 May 2011 at 10:17am
	Although I love what King Tubby did, I can't stop wondering about the horn profile with that scoop. Seems like it is really really narrow right until the last fold, where horn expands rapidly. I guess that thing is tuned reaaaallly low...

rich, ind.st Members Profile Send Private Message Find Members Posts Add to Buddy List Young Croc Joined: 14 January 2005 Location: United Kingdom Status: Offline Points: 1096	Post Options Post Reply Quote rich, ind.st Report Post Thanks(0) Quote Reply Posted: 03 May 2011 at 12:06pm
	I have just built 6 half imperials, whilst they play low they produce a fairly even and balanced sound between 30 and 500 hz. The phase dip is much much less pronounced than on modern scoop designs, i'd argue it acts more like an average size reflex box with a huge flared port than a modern small chamber long horn type design. I've wanted to build some of these for years which is strange considering my general dislike of scoops and the typical scoop sound. My view is that modern scoops have been fixed and fixed and fixed by a number of people since the early days of king tubby using them. sometimes you have to build something to find out if the original was broken in the first place. Uploaded with ImageShack.us Had them out for their inaugural outing on friday at a night playing a variety of hardcore/gabba/hardtek type stuff and they certainly didn't dissapoint. very bangy but also hitting the low notes when required. we were crossing them to the hornloaded 8's at around 500hz. have also tried them in 'classic oldschool reggae system mode' i.e. fullrange with a piezo on'th top and even that sounded fairly acceptable ;)
	music is god