2x15" front loaded horn F2B |
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citizensc
Young Croc Joined: 16 October 2015 Location: Perth,Australia Status: Offline Points: 532 |
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I received some actual real world feedback about different drivers in this cab. Thank you very much to the user that sent this to me and gave permission to relay the information to this thread.
Here are a couple of quote from him: First he tried the pd.1550, this was back in may 'it's all true, the FB2 is a bloody monster , built an MDF prototype with very tired 1550s and only a CA9 and it is stunning' A couple of says ago he tried the 15P80Nd and Kappa 15LF 'ran the cab with the neo Beymas on Sunday, bloody hell it makes a noise, running of half a CA9 the impact was very strong, the CA9 is giving it nothing like the power it needs but it was very impressive, the impact and tonality is better than the 1550' 'The Kappas are a no go, sound terrible, going to run the Beymas very hard at the weekend and see how they last,' |
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snowflake
Old Croc Joined: 29 December 2004 Location: Bristol Status: Offline Points: 3118 |
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BJtheDJ
Young Croc Joined: 28 November 2012 Location: Bristol Status: Offline Points: 884 |
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You left a space on the end of the URL when you cut n pasted, which makes the URL look like this: http://www.loudspeakerdatabase.com/Radian/2216Neo%20 Above will work
Edited by BJtheDJ - 03 September 2020 at 9:41pm |
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If your vaccinations were mandatory and nobody in your class had measles,
then you know that you're not a Millenial kid.</f |
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bass*en*mass
Old Croc Joined: 03 September 2009 Location: "unknown" Status: Offline Points: 4009 |
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at 750usd each the radian option doesnt look tempting tbh., compard to 15ds115 or 15nmb1000?
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jazomir
Old Croc Joined: 20 November 2006 Location: Sunderland UK Status: Offline Points: 1710 |
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Interested as to whether anyone is able, or has been able, to test a group of say, 4 F2Bs with any of the new drivers. I would think that the lf extension of 4 cabs arrayed correctly could at least match a similar number of scoops. The punch of the originals would seem to have been impressive, to say the least, so adding new drivers and several thousand 'extra' watts of input would seem to promise extreme results.
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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: 1537 |
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Running modern power levels and very high-powered drivers would probably require some extra cooling - certainly more space behind the speaker vent, as discussed previously.
In the original system the drivers could get quite warm during a day of loud rock bands at a festival and there would definitely be some power compression. I can remember unstacking large festival systems at the end of a string of heavy metal performances and finding the covers on the speaker chambers warm to the touch. Maybe make the baffle with a thick sheet of aluminium between the driver frame and the wooden board, or invent some clever form of driver cooling using a heatsink with air or liquid heat transfer? Or just accept that the world has moved on and design a new box more suited to modern requirements, although I suspect Tom Danley has covered that need already! It might be best to keep these vintage boxes more or less as they were designed, they work very well for what they are. |
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DMorison
Old Croc Joined: 14 March 2007 Location: Aberdeen Status: Offline Points: 1647 |
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Madboffin, you're going to have to change your handle to SensibleBoffin if you keep this up
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citizensc
Young Croc Joined: 16 October 2015 Location: Perth,Australia Status: Offline Points: 532 |
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With the aluminium panel, I think cooling should improve a lot, especially as it should be exposed to fresh air in most stacking configurations. If you are really committed to cooling the driver you could connect the driver to the panel with a piece of metal, turning the panel in to heat sink for the driver.
I think as far as designing a new box goes, there are lots of diy kick bins around, I think people just like the way this one sounds. Apart from clearance behind the driver, I am not sure what else you can do to improve cooling, warm rear chambers are common in FLHs. Worse case, you have to reduce power by 1-2dB to prevent overheating but lets be honest, if you are pushing it that hard, maybe you don't have enough rig for the gig. When I get time I will sim the 15nmb1000 and the Radian. I am not going to sim the 15DS115 as i know it will sound awful in this cab, even if you somehow make it fit. Even the sales people from B&C say it doesn't sound good over 150hz, its really intended as a sub driver. |
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bob4
Old Croc Joined: 29 February 2004 Location: Finland/Germany Status: Offline Points: 1842 |
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Check out Wayne Parham and 12pi audio. They had come up with a heat transfer aid for labhorns, that involved a piece of thick aluminium pipe machined precisely to fit the polevent of the transducer (aided by thermal paste lubing ) and then attached/bolted to the aluminium service hatch.
Edited by bob4 - 12 September 2020 at 9:53pm |
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TribeGut
New Member Joined: 05 November 2020 Status: Offline Points: 3 |
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In the Hornresp simulation on page3 S4 is 2750.
If taken into account that the share one horn, S4 must be around 5000. With S4=5000 you get a way better response nearly flat. But also this would mean splitting the horn in two parts is not possible without making the cab wider?
Edited by TribeGut - 06 November 2020 at 11:28am |
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Contour
Young Croc Joined: 03 March 2004 Status: Offline Points: 620 |
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Not correct, there are 2 drivers so mouth area ‘seen’ by one unit is half of the total cabinet front area.
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TribeGut
New Member Joined: 05 November 2020 Status: Offline Points: 3 |
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Is there any theory behind it that would back this up, I think they share one mouth from S3-S4 so S4 musst be the total front area or at least more than half. Also if I set S4=5000 i get way better results in the simulation with one or two drivers..
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