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BMS 4555 8ohm

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yodominic View Drop Down
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    Posted: 17 January 2023 at 11:35pm
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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Post Options Post Options   Thanks (0) Thanks(0)   Quote fatfreddiescat Quote  Post ReplyReply Direct Link To This Post Posted: 18 January 2023 at 7:53am
Have you tried Ohm themselves? 

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yodominic View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote yodominic Quote  Post ReplyReply Direct Link To This Post Posted: 18 January 2023 at 8:07am
Originally posted by fatfreddiescat fatfreddiescat wrote:

Have you tried Ohm themselves? 


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 View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote fatfreddiescat Quote  Post ReplyReply Direct Link To This Post Posted: 18 January 2023 at 8:15am
Ouch
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Post Options Post Options   Thanks (0) Thanks(0)   Quote fatfreddiescat Quote  Post ReplyReply Direct Link To This Post Posted: 18 January 2023 at 3:44pm
Contact BMS direct and see if they can do anything considering the circumstances re parts in the UK?
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lickweed View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote lickweed Quote  Post ReplyReply Direct Link To This Post Posted: 19 January 2023 at 11:39am
are you sure they are 4555?
Always thought that trs212 got something bigger.
From bms website:
  • 1.5" Driver for Budget Projects

http://www.liquidsound.co.uk/
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APC321 View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote APC321 Quote  Post ReplyReply Direct Link To This Post Posted: 19 January 2023 at 5:01pm
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 View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote yodominic Quote  Post ReplyReply Direct Link To This Post Posted: 19 January 2023 at 8:24pm
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 View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote MarjanM Quote  Post ReplyReply Direct Link To This Post Posted: 21 January 2023 at 3:43pm
Originally posted by lickweed lickweed wrote:

are you sure they are 4555?
Always thought that trs212 got something bigger.
From bms website:
  • 1.5" Driver for Budget Projects

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.
Marjan Milosevic
MM-Acoustics
www.mm-acoustics.com
https://www.facebook.com/pages/MM-Acoustics/608901282527713
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MarjanM View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote MarjanM Quote  Post ReplyReply Direct Link To This Post Posted: 21 January 2023 at 3:47pm
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.
Marjan Milosevic
MM-Acoustics
www.mm-acoustics.com
https://www.facebook.com/pages/MM-Acoustics/608901282527713
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Post Options Post Options   Thanks (0) Thanks(0)   Quote njw Quote  Post ReplyReply Direct Link To This Post Posted: 21 January 2023 at 5:28pm
 I have some 4554 here I could also measure if it's any help?
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