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medi.root ![]() New Member ![]() Joined: 31 January 2022 Location: ypres Status: Offline Points: 3 |
![]() ![]() ![]() ![]() ![]() Posted: 31 January 2022 at 6:46pm |
searching for tha polar bear scoop plann thanks in advance
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BigSoundNorthWest ![]() Registered User ![]() ![]() Joined: 29 November 2014 Location: Manchester Status: Offline Points: 257 |
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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 ![]() Registered User ![]() ![]() Joined: 15 March 2009 Status: Offline Points: 220 |
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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 ![]() Old Croc ![]() ![]() Joined: 08 July 2012 Location: west midlands Status: Offline Points: 2343 |
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feel the vibes !!! "Who Feels it Knows it" Strong like Lion
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bob4 ![]() Old Croc ![]() ![]() Joined: 29 February 2004 Location: Finland/Germany Status: Offline Points: 1747 |
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Wrong. Refer to the original polar bear thread linked by "jammin45" to find out who the creator really is
![]() Edited by bob4 - 10 February 2022 at 4:47pm |
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toastyghost ![]() The 10,000 Points Club ![]() ![]() Joined: 09 January 2007 Location: Manchester Status: Offline Points: 10861 |
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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- ![]() Old Croc ![]() ![]() Joined: 27 July 2012 Location: UK, South East Status: Offline Points: 7854 |
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Pfly, that's him..
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Global Depopulation - Alive and Killing.
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BigSoundNorthWest ![]() Registered User ![]() ![]() Joined: 29 November 2014 Location: Manchester Status: Offline Points: 257 |
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My mistake guys,
Knew Kev Smugglrr had something to do with em
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