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medi.root View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote medi.root Quote  Post ReplyReply Direct Link To This Post Topic: scoop
    Posted: 31 January 2022 at 6:46pm
searching for tha polar bear scoop plann  thanks in advance
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BigSoundNorthWest View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote BigSoundNorthWest Quote  Post ReplyReply Direct Link To This Post Posted: 06 February 2022 at 11:58am
Fairly sure keV from Dub Smugglers saying he created them. 
Good luck with that.

You'd be better off asking him to build you some, or ask Joe at PCH to make u some



Edited by BigSoundNorthWest - 06 February 2022 at 11:59am
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turbo7 View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote turbo7 Quote  Post ReplyReply Direct Link To This Post Posted: 06 February 2022 at 12:37pm
i did once build one polar bear for comparison, it has a long horn but for drivers xmax greater than 10mm the throat is too small and it will suffer from turbulent airflow. 
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jammin75 View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote jammin75 Quote  Post ReplyReply Direct Link To This Post Posted: 06 February 2022 at 2:09pm
feel the vibes !!!   "Who Feels it Knows it"            Strong like Lion              
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bob4 View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote bob4 Quote  Post ReplyReply Direct Link To This Post Posted: 10 February 2022 at 3:39pm
Originally posted by BigSoundNorthWest BigSoundNorthWest wrote:

Fairly sure keV from Dub Smugglers saying he created them. 
Good luck with that.

You'd be better off asking him to build you some, or ask Joe at PCH to make u some


Wrong.

Refer to the original polar bear thread linked by "jammin45" to find out who the creator really is Wink


Edited by bob4 - 10 February 2022 at 4:47pm
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toastyghost View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote toastyghost Quote  Post ReplyReply Direct Link To This Post Posted: 10 February 2022 at 3:58pm
Originally posted by turbo7 turbo7 wrote:

i did once build one polar bear for comparison, it has a long horn but for drivers xmax greater than 10mm the throat is too small and it will suffer from turbulent airflow. 


That’s not quite how a horn throat works, at least in theory. It’s not a vent, and the acoustic impedances of the rear chamber and first horn section either side of the throat opening will be much closer than a port meeting free air.

The increased compression may push the air into nonlinear behaviour when driven at full chat, but thats more because the pressure at that point might exceed 150 dB as it can in many high power horns, even those for HF.

Doing a proper analysis of the Polar Bear has been on my personal project to-do list for a while, but at first glance, a large portion of its clean, flat and powerful sound appears to be due to the fact it's been designed as a good transmission line as well as an efficient horn.

Rear loaded horns aka scoops have an even smaller mouth than a FLH of the same dimensions, so the acoustic behaviour typically transitions from horn to quarter wave resonant pipe at the low corner.

pfly is the designer and original builder, but I believe both Kev Smuggler and Matt at studio45 in Sheffield are licensed to build them. The plan isn't for general sharing otherwise, as far as I know.
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levyte357- View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote levyte357- Quote  Post ReplyReply Direct Link To This Post Posted: 10 February 2022 at 4:55pm

Pfly, that's him..
Global Depopulation - Alive and Killing.
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BigSoundNorthWest View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote BigSoundNorthWest Quote  Post ReplyReply Direct Link To This Post Posted: 31 March 2022 at 8:26am
My mistake guys, 
Knew Kev Smugglrr had something to do with em
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