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Audio Performance SK-F project
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smitske96 View Drop Down
Young Croc
Young Croc


Joined: 16 February 2016
Location: The Netherlands
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Points: 1092 		Post Options Post Options   Thanks (0) Thanks(0)   Quote smitske96 Quote  Post ReplyReply Direct Link To This Post Topic: Audio Performance SK-F project
    Posted: 24 December 2019 at 1:14pm
I did use "knutsellijm" LOL

It had to be repaired at two areas, both being on one half I did apply the same on the other side.
So now it is patched at four points (symmetrically and all backside). I don't expect to need much Xmax but it minor work to do it somewhat properly. 

I'll keep you informed the coming weeks Thumbs Up
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Bams View Drop Down
Young Croc
Young Croc


Joined: 08 April 2009
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Points: 628 		Post Options Post Options   Thanks (0) Thanks(0)   Quote Bams Quote  Post ReplyReply Direct Link To This Post Posted: 24 December 2019 at 12:48pm
seeing you are from the netherlands.. if u used "Knutsellijm" as used op school.. you are fine. reapply a few times though. i repaired some 15" jbls with it and they acted fine. not really waterresistant tough so make sure the speakerfoam is installed or such. 
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AndyWave View Drop Down
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Joined: 30 March 2008
Location: Finland
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Points: 380 		Post Options Post Options   Thanks (0) Thanks(0)   Quote AndyWave Quote  Post ReplyReply Direct Link To This Post Posted: 24 December 2019 at 12:32pm
Hi

Your reparation looks as it should. But a word of caution, if the patches glued are not on symmetrical pattern around the outer edge, there is a possibility of voice coil rubbing against pole pieces when cone excursion is high, as the patched part maybe now flexing in different manner compared to original outer suspension.

Same applies to repairing light or thin cones. If there is hole poked on one side, just apply same kind of patch on the opposite side to keep mass symmetrical around the voice coil and suspension.

In this case as it is a low mid driver, maybe not so much.
torturing electrons since ......
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smitske96 View Drop Down
Young Croc
Young Croc


Joined: 16 February 2016
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Points: 1092 		Post Options Post Options   Thanks (0) Thanks(0)   Quote smitske96 Quote  Post ReplyReply Direct Link To This Post Posted: 23 December 2019 at 7:59pm
The result:

I patched it up on four areas, looks good enough so far. 
After christmas some testing/measuring is scheduled.
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Old king coles View Drop Down
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Joined: 09 October 2017
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Points: 210 		Post Options Post Options   Thanks (0) Thanks(0)   Quote Old king coles Quote  Post ReplyReply Direct Link To This Post Posted: 02 December 2019 at 7:10pm
I'd assume it's just standard pva 
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smitske96 View Drop Down
Young Croc
Young Croc


Joined: 16 February 2016
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Points: 1092 		Post Options Post Options   Thanks (0) Thanks(0)   Quote smitske96 Quote  Post ReplyReply Direct Link To This Post Posted: 02 December 2019 at 7:00pm
Now the last uncertainty LOL I have some white school glue but it is water-based.
Apart from the applications (paper and other light materials) there is no more info on the container regarding it's composition.
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Old king coles View Drop Down
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Points: 210 		Post Options Post Options   Thanks (0) Thanks(0)   Quote Old king coles Quote  Post ReplyReply Direct Link To This Post Posted: 02 December 2019 at 5:44pm
That's what I did previously,  and a little smear on the repair area for good measure...works a treat
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smitske96 View Drop Down
Young Croc
Young Croc


Joined: 16 February 2016
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Points: 1092 		Post Options Post Options   Thanks (0) Thanks(0)   Quote smitske96 Quote  Post ReplyReply Direct Link To This Post Posted: 02 December 2019 at 3:03pm
Today I'm going to try and fix the L12P110K surround, and in this order probably:

-Make it as clean as possible for the glue
-Make several strips to patch it up
-Apply glue and the strips (on the back)
-Have patience
-Test

The only thing I am not sure about is how to apply the glue.
I also could apply some glue on the strips and then put them on the surround/cone.
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smitske96 View Drop Down
Young Croc
Young Croc


Joined: 16 February 2016
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Points: 1092 		Post Options Post Options   Thanks (0) Thanks(0)   Quote smitske96 Quote  Post ReplyReply Direct Link To This Post Posted: 18 November 2019 at 12:00pm
The 8" driver is indeed Ciare made, it's the M200.50 C/Fx-MR

Power: 150 Watt
Max Power: 300 Watt
Re: 9,20 Ohm
Fs: 114 Hz
Cms: 0,00008975 m/N
Mms: 21,7 g
Le: 0,75 mH
Qms: 1,15
Qes: 0,40
Qts: 0,30
Vas: 5,76
BL: 18,94
u0: 2,05 %
Xmax: 0 mm
Sd: 214 cm2

When interpreting the specs it looks like a good candidate for the cab.
Testing will be done in the coming weeks.
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smitske96 View Drop Down
Young Croc
Young Croc


Joined: 16 February 2016
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Points: 1092 		Post Options Post Options   Thanks (0) Thanks(0)   Quote smitske96 Quote  Post ReplyReply Direct Link To This Post Posted: 16 November 2019 at 4:43pm
In about one week I'll try and repair the RCF but I also have bought two L12P110K's for a good price.
One RCF and the LA driver will be sold.

Regarding the 8" driver, I have send Ciare an email about the driver with some pics and magnet dimensions, hopefully they can help me out. 
If they will suffice I'll keep them for the cab, otherwise I'll exchange them with something different like the B&C 8PE21.

Filters are checked and one has some minor work to it. I drew up the schematic and have simulated the circuit in LTspice. 

Does anyone have experience with the BMS 4548-16 OEM driver? I can't find that much about it, and would like to know if they are up to the job SPL/sound wise. For example a driver like the DE250 isn't that expensive for me.
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cravings View Drop Down
Old Croc
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Joined: 30 January 2007
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Points: 7442 		Post Options Post Options   Thanks (0) Thanks(0)   Quote cravings Quote  Post ReplyReply Direct Link To This Post Posted: 15 November 2019 at 1:59pm
water it down so it's thinner. some people use coffee filter paper too.
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smitske96 View Drop Down
Young Croc
Young Croc


Joined: 16 February 2016
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Points: 1092 		Post Options Post Options   Thanks (0) Thanks(0)   Quote smitske96 Quote  Post ReplyReply Direct Link To This Post Posted: 15 November 2019 at 12:31pm
I have found something similar. Would PVA glue suffice?
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