Ultimate kick bin? |
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djeddie
Old Croc Joined: 26 April 2004 Location: Bristol Status: Offline Points: 4125 |
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Chas n Dave : it's like Drum and Bass but with beards. E=mc² ±3dB
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snowflake
Old Croc Joined: 29 December 2004 Location: Bristol Status: Offline Points: 3118 |
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this is the most detailed drawing I've seen of the F2B |
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citizensc
Young Croc Joined: 16 October 2015 Location: Perth,Australia Status: Offline Points: 532 |
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I wonder if that drawing is to scale, with the external box dimensions you could get a rough idea of the internal dimensions. It even has the unfolded horn length! If I find some time in the next week or two, I might try sim it in hornresp.
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citizensc
Young Croc Joined: 16 October 2015 Location: Perth,Australia Status: Offline Points: 532 |
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Okay, I couldn't help my self, it honestly went better than expected, I suspect that image is based on an actual internal drawing, driver is PD.1550. 1 pixel = 9mm single F2B 4ohm load 2 F2B, series parallel, 8ohm load Edited by citizensc - 09 May 2020 at 5:06am |
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csg
Old Croc Joined: 17 September 2007 Location: bedford Status: Offline Points: 6086 |
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“The fact is this is about identifying what we do best and finding more ways of doing less of it better”
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citizensc
Young Croc Joined: 16 October 2015 Location: Perth,Australia Status: Offline Points: 532 |
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I couldn't find the Le so I just set it to 1.5mH, doesn't appear to have any impact in the usable bandwidth anyway. Seems to be quite useable down to 50hz with 2 F2B coupled.
Pa100-375 Bass Edited by citizensc - 09 May 2020 at 8:38am |
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cravings
Old Croc Joined: 30 January 2007 Location: Ireland Status: Offline Points: 7441 |
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blc driver i think i've read?
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snowflake
Old Croc Joined: 29 December 2004 Location: Bristol Status: Offline Points: 3118 |
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there is a throat chamber of the air between the driver and the baffle.
I suspect that the throat area is about 350cm2 and expands in both directions in that first throat section. |
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doller
Young Croc Joined: 19 July 2014 Location: japan Status: Offline Points: 509 |
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nice one guys. If it is to scale just think about the 15 inch driver that is a great start point. it's 15 inch. also the external dimensions of the box are available.
Thanks again. interesting stuff. |
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citizensc
Young Croc Joined: 16 October 2015 Location: Perth,Australia Status: Offline Points: 532 |
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Do you mean a chamber extra to what is pictured? or the bit I have colored in red? Maybe you could roughly draw it on so I understand? |
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snowflake
Old Croc Joined: 29 December 2004 Location: Bristol Status: Offline Points: 3118 |
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the volume that is above the cone of the speaker diaphragm, the top of it is the baffle that driver is bolted to. there must be a hole (porbably rectangular) through that baffle linking the front chamber to the throat (the bit you've coloured red).
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Robbo
Old Croc Joined: 05 December 2005 Location: Shropshire Status: Offline Points: 4221 |
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I find all of this highly amusing because when I gave our cabinet maker an empty original F2B he had a fair bit of fun measuring everything so as to get the correct measurements, angles and sizes and then swore at me when I told him that I wanted the cabinet stretched by 2.5" to enable the speaker cavity to take large chassis/magnet drivers as only the ATC(long coil bass with linen surround) or an RCF driver would fit in the original cabinet.
Even the driver rebate dia had to be made deeper and larger in order to accommodate more modern drivers with greater Xmax than the originals so the cabinet is a bit of a nightmare build for accomplished professional builders so anyone who is thinking of attempting to build without an original to copy or a proper full drawing---I wish them the best of luck as they are going to need it |
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