KEF B200 Sp1039

[wightie]

just holed the diaphragm on one of my KEF B200 SP1039 drivers in my proacs....its a long story involving a repair to an audax HD12x9 tweeter (that didnt work), moving the speaker, it slipping out its cutout and pop.

sad sad day. im now hunting around for a replacement however dont seem to be having much success. was thinking i may just change the drivers instead. wilmslow suggest a peerless model however without getting hold of a frequency response graph for the B200 im at a bit of an impass.

if got a one sided data sheet with info but without a plot its going to be hard to match or make accurate decisions.
has anyone got a copy they could email me....or point me in the right place for getting one.

failing that any experience regarding replacements for these would be nice too.

thanks.

 

[pinkmouse]

You could try these guys, they might have more info...

 

[pinkmouse]

And thinking about it, I might even have a pair of the triangular front B200s lying around somewhere at home...

 

[loek]

Hi Wightie, i have to look in my archive.
Last year i sold my Kef 104AB's.
Keep you informed, Loek

 

[wightie]

thanks guys,
got a good data sheet and have posted on the other forum too.
hopefully all is not as black as it seemed and i will get hold of a spare and not need to look at options fingers crossed anyways.

still grumpy at my moment of stupidity though

 

[wightie]

pinkmouse,

just wondering if you had any luck with your triangular fronted B200s at home.
mine are regular circular ones but i will happily change over if they are the same apart from that

 

[pinkmouse]

Didn't get chance to check, will look tonight!

 

[pinkmouse]

Sorry, I checked, and they are not B200s, they are one of the later looky-likey versions with a paper cone. My memory failed me again!

 

[wightie]

not to worry, many thanks for looking anyways.
ill go back to scouring evilbay and used ads

 

[planet10]

Spec sheet here on my site...

http://www.t-linespeakers.org/drivers/b200.html

This was used in the 104s & the 103s if you want to go far as finding some donors.

dave

 

[loek]

B200

I could only find the SP1014 version.
good luck, Loek

 

[pheebut]

hey man, i currently own two spare b200 sp1039 drivers. they are in mint condition. i found them in the loft with another built up kef speaker unit.
so if this reply is too late.
Phee

 

[irishiranian]

Longest shot in the world but you don't still have those 1039s do you? Failing that can anyone suggest a suitable alternative for my IMF TLS 50 mk2s. Thanks.

 

[planet10]

The TLS50 Mk II i stuck my head in used SP1014 which should be pretty commin in the UK.

dave

 

[irishiranian]

Mine are def the 1039. Is there a lot of difference between the two? I'd rather try and source a direct replacement or modern equivalent (if that is possible!?)

 

[planet10]

Big difference between 1039 & 1014. Big vrs small magnets

Specs here: TL Links

dave

 

[DrBoar]

I got a pair of SP1014 that I do not have any need for...

The problem with SP1014 and other bextrene drivers like the ones from Audax is that they have a rising frequency response say +5 dB from 1 to 4 kHz, while modern plastic drivers do not

All measurements using a XTZ Room Analyzer II, with the driver in a 50x30cm baffle/box.
KEB B200 SP1014, with exellent driver matching

The Audax HDB25H2C12, with one of the drivers buzzing the other OK

Peerless 850126 (PP cone and inverted dome)

Peerless 831862 PP cone and mesh/fabric dome

Replacing KEF B200 with modern drivers may work if used say below 500 Hz but above that crossover has to be redone.

Laurie Fincham head of R&D at KEF, stated as I recall that them main advantage of Bextrene (and later plastics) was consistency. Then things like frequency peaks could be dealt with in the crossover. As of today 30 years later paper is still around, as is other material as metal alloys.

 

[nimo_jon]

Thank you Dr. Boar for the frequency response curve.