Should I re-cap my 105.3's - diyAudio
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Old 21st September 2012, 06:49 AM   #1
moss99 is offline moss99  United Kingdom
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Default Should I re-cap my 105.3's

Hi all
I have a pair of 105.3 ,have had them for around 5 years I did the bass driver refoams when I first got them which went well ,
I then got through around 4 sets of tweeters which I think was from driving them with a Denon A1 av multichannel amp (quite loudly).
I now have a pair of bryston 7bsst monoblocs and they sound great (and dont blow tweeters) .
I am toying with the idea of replacing the caps (falcon acoustics now do a kit)
So is it a good idea to replace them all due to age ? I am also thinking if there not broke don't fix!,,
Hmmmm

Last edited by moss99; 21st September 2012 at 07:11 AM.
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Old 21st September 2012, 08:20 PM   #2
moss99 is offline moss99  United Kingdom
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Have always found them a bit bass light so have a pc13 ultra to up the bass ,,
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Old 21st September 2012, 09:24 PM   #3
AMV8 is offline AMV8  United Kingdom
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I have a pair of 105.2's which I recapped some years ago and it made them much clearer.
I am not sure how familiar you are with electronics and if you do recap the crossover you may feel happier using a ready made kit. However if you do want to DIY you will be able to buy the individual capacitors from Rapid Electronics, Farnell, RS or Wimslow Audio. The latter company specialise in speakers and you will find them knowledgeable of your particular speaker.
I would replace all plastic capacitors ( especially in the mid and treble filters ) with polypropylene ones and replace bipolar electrolytic ones with new bipolar electrolytics.
The spec for the 105.3 does not show any weakness at the low end and I would suspect a piece of equipment earlier in the chain if you lack base.
Don
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Old 21st September 2012, 09:38 PM   #4
moss99 is offline moss99  United Kingdom
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Hi
This is the kit I have been looking at
KEF 105.3 REPLACEMENT CAPACITOR SET

I think the weak link in my setup now is the processing am using pioneer sclx81 have been looking at primares sp32 but that will mean 3 more power amps !!! (Costly if I stick to Bryston )
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Old 22nd September 2012, 04:09 PM   #5
Bare is offline Bare  Canada
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Don't be refitting Electrolytics.
The maker was astoundingly Miserly..to fit them in the first place. For a manufacturing savings of less than 1$ per speaker pair ?.. likely less.
Another of the reasons KEF has been a perennial 'also ran'.
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Old 22nd September 2012, 04:38 PM   #6
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Not saying I disagree re the electrolytics (they can be OK, but there are better options) but as for KEF being a perennial also-ran, try telling that to a lot of LS3/5a fans & see how far you get.
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Old 22nd September 2012, 09:29 PM   #7
AMV8 is offline AMV8  United Kingdom
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Hi
If you do decide to change some capacitors from electrolytics to plastic then you need to compensate for the reduced equiuvalent resistence of the plastic capacitor as compared to the electrolytic capacitor by adding additional resistors in series with each new plastic cap that replaces an electrolytic. That is why I recomended sticking with electrolytic capacitors where already used.
when I recapped my 105 speakers I spoke to KEF about the possibility of changing from electrolytic to plastic. The reply was that their crossover design did take account of the characteristics of each capacitor used in the crossover. KEF recomended reusing the same type of capacitor and NOT changing from electrolytic to plastic. If a change from electrolytic to plastic is made KEF recomended adding a resistor in series with the replacement plastic capacitor with a value of 1 ohm for each 10uf of electrolytic capacitor replaced. In KEF's view this was as close as a replacement plastic capacitor could get to the original design.
Also I do think that electrolytic capcitors have a worse reputation that is really deserved.
My crossover does contain electrolytics as in the original design except in the treble crossover where I changed to all plastic with added resistence as recomended by KEF.
I hope this explains the rational behind my original comments.
Don
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Old 22nd September 2012, 10:06 PM   #8
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Is it the percieved wisdom that i.r.o the bass section of the 105/3, the crossover is "as good as it needs to be ?"

I'm curious.

Some say:- "chokes mst be air cored" but the inductor(s) in the bass section on my 105/3's are the size of a house ! - I think they are ferrite dust cored and look very expensive.

What would be the up / downsides of going "air" ?

Supplementary question:-

Imagine I wanted the bass to reach a few hz deeper, where would you start ? If you are not familiar with the 105/3 crossover, please see piccies below:-

[IMG]Click the image to open in full size.[/IMG]

[IMG]Click the image to open in full size.[/IMG]

Thanks
__________________
The older I get, the fitter I was !

Last edited by clubsport911; 22nd September 2012 at 10:17 PM.
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Old 23rd September 2012, 11:55 AM   #9
tvrgeek is offline tvrgeek  United States
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Changing the crossover is not going to give you more bass. LF extension is a function of the drivers and the box. If you want a tad more bass, build a pair of subs.

Air coils may have a tad less distortion, but need more wire, so to the the same resistance, thicker and a lot more money, let along they will be physically very big. I only use air up to 1mH. The caps will be causing far more distortion. Nothing much you can do about that except maybe bypass them with 1u films.
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