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2x15" front loaded horn F2B |
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smitske96 
Young Croc 
Joined: 16 February 2016 Location: The Netherlands Status: Offline Points: 1217 |
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 Posted: 07 June 2024 at 6:30pm |
Any measurements?
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snowflake
Old Croc 
Joined: 29 December 2004 Location: Bristol Status: Offline Points: 3443 |
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Posted: 07 June 2024 at 7:32pm |
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wouldn't it be better to rear vent this design so that the path length difference from horn and path is close to zero in front of the box and close to half a wavelength of 100Hz at the rear?
Edited by snowflake - 07 June 2024 at 7:32pm |
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Contour
Young Croc
Joined: 03 March 2004 Status: Offline Points: 677 |
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Posted: 07 June 2024 at 7:36pm |
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The reflex port will have a phase delay also, it is not just about distances.
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jazomir
Old Croc
Joined: 20 November 2006 Location: Sunderland UK Status: Offline Points: 1759 |
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Posted: 07 June 2024 at 7:41pm |
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Wow, that's pretty impressive! How does it sound at the bottom end, though, especially at high spl? Is Snowflake correct about possible phase amolalies?
Edited by jazomir - 07 June 2024 at 7:44pm |
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For sidefills, can we have two enormous things of a type that might be venerated as Gods by the inhabitants of Easter Island, capable of reaching volumes that would make Beelzebub soil his pants.
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madboffin
Old Croc
Joined: 03 July 2009 Location: Milton Keynes Status: Offline Points: 1720 |
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Posted: 08 June 2024 at 5:31pm |
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That's an interesting and impressive modification. It will allow much better cooling of the drivers too. In case anyone is interested, the old Martin RS800 / VRS800 / VRS1000 cabinets also had rear venting to extend the bass. Dave Martin originally tried the concept in the early 1970's for the Sundown nightclub installations. A 215 Mk1 had a hole cut in the side to access the chamber behind the speaker, and the cabinet was sat on top of a plinth that acted as a resonator chamber, with a front port. The idea is an old one, dating from cinema bass horns of the 1930's.
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Jan-2T
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Joined: 18 October 2024 Location: Belgium Status: Offline Points: 137 |
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Posted: 18 October 2024 at 10:00am |
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I have (almost) all the panels cut for the Fake2B, 18 sound speakers with TS very similar to the MB15N405. Height 164 so will do alu panel over speaker magnets. Fs 42Hz | Qms 4,36 | Qes 0,26 | Qts 0,25 | Vas 137l | Mms 120g | Xmax 6,5mm Will keep you posted!
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teeth
Young Croc
Joined: 05 July 2021 Status: Offline Points: 762 |
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Posted: 24 December 2024 at 12:33pm |
any news here my boy?
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Jan-2T
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Joined: 18 October 2024 Location: Belgium Status: Offline Points: 137 |
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Posted: 26 December 2024 at 3:20pm |
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b.t.w. the speakers I mentioned are the 18 sound 15LW1400 I'm now finishing a trio of Startec's HR118, ready for paint. Then i'll source the last bits for this F2B cab. need some 6mm ply and some fat beams for the small triangular and trapezoidal sections (or maybe stack some scrap 18mm to get the thickness for the shapes) When finished I want to search someone with some measuring gear who wants to help and measure the response.
Edited by Jan-2T - 26 December 2024 at 3:21pm |
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Music!
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doller
Young Croc
Joined: 19 July 2014 Location: japan Status: Offline Points: 538 |
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Posted: 13 March 2025 at 6:11am |
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madboffin
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Joined: 03 July 2009 Location: Milton Keynes Status: Offline Points: 1720 |
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Posted: 13 March 2025 at 3:28pm |
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Unfortunately, Yahoo JP have blocked the site's availibility in Europe, so I can't see the link.
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doller
Young Croc
Joined: 19 July 2014 Location: japan Status: Offline Points: 538 |
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Posted: 13 March 2025 at 11:49pm |
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he is selling four in very , very good condition.
Wants 150,000 yen a box. Starting bid 100,000yen. Won't say what driver is in them. I would want to know. Could be an e140 knowing the locals here. VPN anyone? Bob? work your Majic. yahoo are so stupid.
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madboffin
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Joined: 03 July 2009 Location: Milton Keynes Status: Offline Points: 1720 |
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Posted: 14 March 2025 at 4:40pm |
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There was at least one F2 system in Japan in the 1990s. It belonged to N&N Sound Freaks of Tokyo. They started out with 28 F2B and 28 F2 Rack boxes with various modules fitted. I'm not sure if they added more to the system later, or if any other Japanese companies had F2. The Martin distributor in JP was Otaritec. |
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Isitone wrote: