Mystery 12" B&C Drivers |
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JYSE
Registered User Joined: 08 May 2021 Location: Midlands Status: Offline Points: 15 |
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Posted: 16 June 2021 at 9:20pm |
Hi all
Here I have some "mystery" B&C drivers which I picked up on fleabay. On the drivers there is little to no markings which indicated what model/ range they are so I am assuming they are OEM units for something or other but, If anyone can shell some light onto what the may be I would be appreciative. Assumed specs/model: - 1000w - 8ohm - 12FG100 (chassis) - 12TBX100 (cone) Onedrive link to Images https://1drv.ms/u/s!AsETDk-Fgstnfu2s5Ega9ozNCxA?e=fijErA Edited by JYSE - 16 June 2021 at 9:24pm |
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smitske96
Young Croc Joined: 16 February 2016 Location: The Netherlands Status: Offline Points: 1085 |
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Tried contacting B&C directly?
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JYSE
Registered User Joined: 08 May 2021 Location: Midlands Status: Offline Points: 15 |
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Yeah man, I sent their tech support team an e-mail this morning but not yet had any reply back from them.
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PISSHEAD
Young Croc Joined: 24 July 2004 Location: West Midlands Status: Offline Points: 584 |
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There's a bloke selling loads of Martin Audio spares, did you buy them off him?
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The 'drunken master' strikes again.
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MPASOUND
Registered User Joined: 25 April 2006 Location: UK Status: Offline Points: 257 |
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I saw these too, it looks to me like it's Martin themselves selling them along with a load of other bits. If they don't know it's origin then I doubt anybody does! I have found B&C to be quite helpful in the past though so their tech guys should reply.
Failing that then look into measuring the T/S parameters yourself.
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It's just bits of paper flapping about in a box.
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JYSE
Registered User Joined: 08 May 2021 Location: Midlands Status: Offline Points: 15 |
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Update:
I got word back from B&C and they couldn't say much about the drivers due to having an NDA inplace with the original customer. They did say however that they are lab samples provided as a bespoke speaker for the client and thats about it. The client is pretty obvious (at least to me anyway) being that these came from High Wycombe and the seller listed a lot of martin components etc. I'm going to run some TS measurements at some point albeit will be very generalised as ill be using REW to do so. But that should give me some indication as to what specs they are. I will post the results for ultimate nerd points
Edited by JYSE - 18 June 2021 at 1:41pm |
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toastyghost
The 10,000 Points Club Joined: 09 January 2007 Location: Manchester Status: Offline Points: 10920 |
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What makes you think using REW to measure Thiele-Small parameters is going to be less reliable than how they’re done normally?
Check all of your drivers and do some manual averaging of the measured parameters. Ideally not sat on a bench… mount them in a known test box or flush mount them into an ‘infinite’ baffle. That should be the norm for anyone designing or building a speaker, anyway. You’ll only get more detailed results if you invest in some very expensive hardware and an anechoic chamber. |
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JYSE
Registered User Joined: 08 May 2021 Location: Midlands Status: Offline Points: 15 |
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Only reason being, itll be a learning curve for me. I've only done research for a uni project on TS measurements with REW haha. Looks fairly easy and straightforward to do though and I'm quite competent at these kind of things just never had a reason to do it before now
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toastyghost
The 10,000 Points Club Joined: 09 January 2007 Location: Manchester Status: Offline Points: 10920 |
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You only need a resistor, some bits of wire and a known weight to tape to the cone. It’s close enough for cabinet spec work, until you’re at the level of needing the full data for a driver.
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JYSE
Registered User Joined: 08 May 2021 Location: Midlands Status: Offline Points: 15 |
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Update:
So, My friend Billy had a DATSv3 tester in his shed that he has kindly loaned me for the testing of these drivers. here are the free air parameter results. F(s) - 43.27hz Re - 3.661 Ohms Q(ts) - 0.2277 Q(es) - 0.2369 Q(ms) - 5.884 L(e) - 0.8994mH Vas - TBC (I didn't have a added mass that i knew the exact weight of to conduct this measurement)
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snowflake
Old Croc Joined: 29 December 2004 Location: Bristol Status: Offline Points: 3118 |
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a penny weighs 3.5g
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JYSE
Registered User Joined: 08 May 2021 Location: Midlands Status: Offline Points: 15 |
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thats actually a very good point haha. 3.56g penny and a bit of masking tape will do the job
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