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Anyone running KEF speakers??

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peterb View Drop Down
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    Posted: 09 Mar 2019 at 10:21am
Unfortunately Jon I don't have all the measurement equipment although I would be fascinated to attempt it! Presumably measurements would have to be made in a acoustically neutral room?
I think a simulated approach, using datasheet info might be the best I could achieve. 
Peter
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Dual 505-1, Cyrus CD T, DIY 80W MosFet amp and PreAmp, 2xKEF 103.2
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Fatmangolf Quote  Post ReplyReply Direct Link To This Post Posted: 09 Mar 2019 at 8:55am
Testing and CAD simulation have moved on enormously so a modern crossover for the old drivers (assuming they are 100%) could be different to the 1970's crossover.

Bencat's active digital approach sounds straightforward when done carefully as he describes. Otherwise it is reasonably straight forward to design and build a passive crossover if you have the skills and tools. I'm an amateur not a professional speaker designer so I measure each driver's frequency response and impedance curves in the speaker enclosure and go from there.

Jon

Open mind and ears, whilst owning GSP Genera, Accession, Elevator EXP, Solo ULDE, Proprius amps, Cusat50 cables, Lautus digital cable, Spatia cables and links, and a Majestic DAC.
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Richardl60 Quote  Post ReplyReply Direct Link To This Post Posted: 07 Mar 2019 at 9:39pm
probably see what their responses are you will see the Falcoln connection with KEF even they now produce new OE drivers B110,B139 so have a leaning towards FA but should be 3 reliable sources-hopefully will all give you the same response!
The Source turntable, Audiomods V micrometer, Dynavector XX2-2, Leema Antila 2Seco CD player, TDL studio 1.
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peterb View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote peterb Quote  Post ReplyReply Direct Link To This Post Posted: 07 Mar 2019 at 7:41pm
No problem Andrew, I might contact Kef and see what they can tell me.
Good idea Richard, Falcon are pretty helpful as well, I will drop them an email.
Finally I will also contact Wilmslow Audio who sold me the original kits.

Don't know what I will do if I get three completely different answers!




Peter
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Dual 505-1, Cyrus CD T, DIY 80W MosFet amp and PreAmp, 2xKEF 103.2
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Richardl60 Quote  Post ReplyReply Direct Link To This Post Posted: 07 Mar 2019 at 6:47pm
you may wish to try jerry at falcon acoustics sure they do kits for caps of most or all of kef range and well priced and as original as practical. 

Yes they do take time to burn in and as I changed my interns wiring and bindings posts at ten same time cannot comment on which compieentwas responsible for what but did improve sound quite a lot though cannot readily swap back again 

From memory sound was cleaned up tighter, better soundstage and speakers became more invisible. Dynamics improved and general colouration reduced 

Worthwhile in my experience and suspect the cables did contribute significantly 
The Source turntable, Audiomods V micrometer, Dynavector XX2-2, Leema Antila 2Seco CD player, TDL studio 1.
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Bencat Quote  Post ReplyReply Direct Link To This Post Posted: 07 Mar 2019 at 9:31am
Peter my abject apologies I have done the stupid man read thing . My KEF 103 are the original version which were Mid seventies as per the below link . These are very different from the KEF 103.2 you are using and none of what I did would apply sorry for being so dense .

http://uk.kef.com/explore-kef/kef-museum/1970s/reference-series-model-103-1976-77

Originally posted by peterb peterb wrote:

Pleased to read someone else has good experience with Kef 103s.
Andrew I would be interested to know about the upgraded crossovers you built. 
Did you just duplicate the values?
Can you recall what make the caps were, below is the original circuit diagram from my kit.

Andrew
Raspbery Pi/Justboom Digi - MiniDSP DDRC 24 - Krell KSA50 - Quad ESL57
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Bencat Quote  Post ReplyReply Direct Link To This Post Posted: 07 Mar 2019 at 9:27am
@Old Skool I know what you mean . Originally I used a MiniDSP HD 24 and then generated filters with REW software and they worked and at the time I thought they worked well . However there always seemed to be scope for improving the filter and never ending tweaking.

I then bought the firmware upgrade to DIRAC Live and things were very different . The process is very structured and easy to follow in a step by step way . The only area I would advise any user to take extra care with is the Nine microphone poistions you use for the measurements. Try and get the first listening position as precise as you can and mark it . Then measure the other positions as carefully as you can .

If you do this then the software in DIRAC has the very best chance to get a real idea of the room and your listening position and then produces the best filter it can . The programme produces a target curve and for amny they just load this which will be fine and sound very good. A little extra time and study to look at the response graphs produced to amke sure that you are only reducing peaks and not trying to fill in lows will pay real sound benefits as it will not stress your amplifier and speakers in to areas they do not want to go .

My Passive KEF's with new crossovers was an excellent speaker as an active speaker it is just so much better the excellent drivers are allowed to give there very best and the sound is detailed and alive and just makes you want to play just one more track before you turn it off which turns in to ten or twenty more . This is one of my criteria for judging the quality of any system do I want to listen to more all the time , if I do then that is a good system if not then the obvious conclusion .
Andrew
Raspbery Pi/Justboom Digi - MiniDSP DDRC 24 - Krell KSA50 - Quad ESL57
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