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BMS 4555 8ohm |
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yodominic 
Young Croc 
Joined: 18 December 2008 Location: London Status: Offline Points: 709 |
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 Topic: BMS 4555 8ohmPosted: 17 January 2023 at 11:35pm |
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Hi All, I ordered some of these diaphragms from Lean Audio around Apr/May last year, every-time I called them that have not had stock since, getting a bit fed up with them but no point in requesting a refund if I can’t buy it anywhere, these are for my OHM TRS212. Do we have anyone here who deals with BMS now that Tony is no longer RIP
Many thanks
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fatfreddiescat
Young Croc
Joined: 15 October 2010 Location: N.E.Wales Status: Offline Points: 1048 |
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Posted: 18 January 2023 at 7:53am |
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Have you tried Ohm themselves?
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yodominic
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Joined: 18 December 2008 Location: London Status: Offline Points: 709 |
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Posted: 18 January 2023 at 8:07am |
In the beginning I did order from them and then realised they are OHM badged BMS drivers at more than double the price.
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fatfreddiescat
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Joined: 15 October 2010 Location: N.E.Wales Status: Offline Points: 1048 |
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Posted: 18 January 2023 at 8:15am |
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Ouch
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fatfreddiescat
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Joined: 15 October 2010 Location: N.E.Wales Status: Offline Points: 1048 |
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Posted: 18 January 2023 at 3:44pm |
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Contact BMS direct and see if they can do anything considering the circumstances re parts in the UK?
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lickweed
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Joined: 02 May 2009 Location: leyton Status: Online Points: 2462 |
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Posted: 19 January 2023 at 11:39am |
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are you sure they are 4555?
Always thought that trs212 got something bigger. From bms website:
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http://www.liquidsound.co.uk/
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APC321
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Joined: 24 August 2013 Location: West Midlands Status: Offline Points: 608 |
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Posted: 19 January 2023 at 5:01pm |
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Couldn't find any detailed information on the compression driver, but from the Ohm Trs 212 datasheet:
2-Way dynamic loudspeaker in a multi purpose enclosure design, housing 2 x 12” proprietary OHM low mid bass driver, internally and externally ventilated double sided high temperature voice coil, 1.5” exit compression driver on 60° x 40° CD horn. |
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yodominic
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Joined: 18 December 2008 Location: London Status: Offline Points: 709 |
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Posted: 19 January 2023 at 8:24pm |
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They are BMS 4555 for sure, as I mentioned initially I used to order from OHM and once I received BMS without any OHM badge :) but at the inflated price.
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MarjanM
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Joined: 10 February 2005 Location: Macedonia Status: Offline Points: 7708 |
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Posted: 21 January 2023 at 3:43pm |
Only "bigger" HF drivers would be some 4 inch voice coil from either B&C or RCF. Dont be confused by the size. Completely different technology at the BMS drivers.
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Marjan Milosevic
MM-Acoustics www.mm-acoustics.com https://www.facebook.com/pages/MM-Acoustics/608901282527713 |
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MarjanM
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Joined: 10 February 2005 Location: Macedonia Status: Offline Points: 7708 |
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Posted: 21 January 2023 at 3:47pm |
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To the original poster.
BMS 4550, 4554 and 4555 are pretty much same everything inside. The only difference is the length of the central black tube. If you can measure it i can compare it with the 4550 and if yours is longer, then you can use the 4550 recone kit but you will have to chop off few mm of the tube. Not too difficult job to do.
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Marjan Milosevic
MM-Acoustics www.mm-acoustics.com https://www.facebook.com/pages/MM-Acoustics/608901282527713 |
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njw
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Joined: 26 March 2010 Location: S. Wales Status: Offline Points: 2537 |
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Posted: 21 January 2023 at 5:28pm |
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I have some 4554 here I could also measure if it's any help?
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fatfreddiescat wrote: