Hi,
Can any Q100 owners confirm if there is or isn't a zobel? From pics on Medleys Musings and others it looks like it doesn't but going by the driver measurements, it needs a 4R + 16uF zobel.
I have done search for "Kef Q100 zobel" but found no info on whether Kef uses one.
Many thanks for taking the time to check your speaker. May the internet Gods bless your every endeavour!
Can any Q100 owners confirm if there is or isn't a zobel? From pics on Medleys Musings and others it looks like it doesn't but going by the driver measurements, it needs a 4R + 16uF zobel.
I have done search for "Kef Q100 zobel" but found no info on whether Kef uses one.
Many thanks for taking the time to check your speaker. May the internet Gods bless your every endeavour!
The crossover seems to be just a series woofer inductor, and a series RC for the tweeter, no Zobel.
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Hi Nanoloop!
Adding or not a Zobel is more complicated than just looking at the woofer impedance chart. It also affects the phase matching.
Whether or not one is required is a matter of the entire system matching, and while there are calculators giving "ideal" values, it is subject to a great deal of nudging to improve phase matching. Of course, not having one is less expensive.
Before you decide a design needs a Zobel or not, you must be prepared to analyze the entire system.
Best,
Erik
Adding or not a Zobel is more complicated than just looking at the woofer impedance chart. It also affects the phase matching.
Whether or not one is required is a matter of the entire system matching, and while there are calculators giving "ideal" values, it is subject to a great deal of nudging to improve phase matching. Of course, not having one is less expensive.
Before you decide a design needs a Zobel or not, you must be prepared to analyze the entire system.
Best,
Erik
There is no zobel as far as I can tell from my measurements of impedance. But why do you need a zobel? Probably useful for tube amps. If you want a flatter impedance curve, then you should use the opportunity to design a better crossover as well.
KEF Q100 crossover
Zobel? No.
You MUST read my spanish thread:
KEF Q100 Uni Q bookshelf speakers. 5.25" coaxial with front bass reflex.
-> KEF Q100 Uni Q bookshelf speakers. 5.25" coaxial with front bass reflex.
to English -> https://translate.google.com/transl...-25-coaxial-with-front-bass-reflex&edit-text=
Trust me, I highly recommend you my cheap tweak:
You only need:
* WURTH ELEKTRONIK 74272733 FERRITE CORE, SPLIT, 8MM, 30MHZ
* LCR160-030: 15pF 160Vdc LCR Polystyrene Capacitor ±1pF
* Rockwool
Zobel? No.
An externally hosted image should be here but it was not working when we last tested it.
You MUST read my spanish thread:
KEF Q100 Uni Q bookshelf speakers. 5.25" coaxial with front bass reflex.
-> KEF Q100 Uni Q bookshelf speakers. 5.25" coaxial with front bass reflex.
to English -> https://translate.google.com/transl...-25-coaxial-with-front-bass-reflex&edit-text=
Trust me, I highly recommend you my cheap tweak:
An externally hosted image should be here but it was not working when we last tested it.
You only need:
* WURTH ELEKTRONIK 74272733 FERRITE CORE, SPLIT, 8MM, 30MHZ
* LCR160-030: 15pF 160Vdc LCR Polystyrene Capacitor ±1pF
* Rockwool
An externally hosted image should be here but it was not working when we last tested it.
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KEF Q00 notchs to "singing"
If you want that the KEF Q100 singing: two notch filters by soft (you need to add VSTplugin in foobar2000, AIMP, J River and others soft players) at 65Hz and 130Hz.
With this attenuation.
If you want that the KEF Q100 singing: two notch filters by soft (you need to add VSTplugin in foobar2000, AIMP, J River and others soft players) at 65Hz and 130Hz.
With this attenuation.
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Awesome answers ! Thank you all so much. I'm having some fun experimenting with a Q200c... It's a different animal than the Q100 (it has SP1587.2 driver in 2litre sealed enclosure, whereas Q100 is reflex loaded SP1587). I couldn't get it sounding even close to "right" until I used a zobel. So I was wondering what kind of magic Kef had used in the Q100. The proper engineering kind it seems. 🙂
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KEF Q100 and Q200C have the same marvellous 5.25" coaxial speakers.
KEF Q300 had 6.5" coaxial => the sound is not marvellous because sound like traditional systems and not like coaxial (waveguide).
And yes, I love my tweaked KEF Q100. Only $300 again in Amazon.com
[Customer Reviews] -> https://www.amazon.com/KEF-Q100-Boo...s&showViewpoints=1&sortBy=recent&pageNumber=1
Remember: they need a long burning because the suspension? is very rigid. Freshly box opened sound very bad, without bass.
KEF Q300 had 6.5" coaxial => the sound is not marvellous because sound like traditional systems and not like coaxial (waveguide).
And yes, I love my tweaked KEF Q100. Only $300 again in Amazon.com
[Customer Reviews] -> https://www.amazon.com/KEF-Q100-Boo...s&showViewpoints=1&sortBy=recent&pageNumber=1
Remember: they need a long burning because the suspension? is very rigid. Freshly box opened sound very bad, without bass.
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Thanks, I really like these Kef drivers too. The Q200c has a nasty crossover though with 3 electrolytic caps and 2 ferrite core coils. It sounded rough until the caps settled in. So I've been experimenting - found the tweeter is about 3dB stronger than mid range, and that is about 1dB stronger than the woofer. The mid resonates between 300 to 400hz cos of the tiny box so they need a 3rd order crossover. Anyway, still experimenting.... if only work wouldnt stop interupting the fun 🙂
An externally hosted image should be here but it was not working when we last tested it.
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Well, your modified KEF 200C.
Modified KEF Uni-Q speakers. Bi-amping & crossover. KEF Q200c.
-> https://myl8test.wordpress.com/audio/kef-q200c/
I could not dismantle the KEF Q 100 speakers -to change the wires with Neotech SOCT-16 hookup wire- for fear of breaking something!
-> http://aficionados.foroactivo.com/t...ers-5-25-coaxial-with-front-bass-reflex#16071
[url]https://myl8test.files.wordpress.com/2016/11/p1070570.jpg[/url]
Please, tell me how.
Modified KEF Uni-Q speakers. Bi-amping & crossover. KEF Q200c.
-> https://myl8test.wordpress.com/audio/kef-q200c/
I could not dismantle the KEF Q 100 speakers -to change the wires with Neotech SOCT-16 hookup wire- for fear of breaking something!
-> http://aficionados.foroactivo.com/t...ers-5-25-coaxial-with-front-bass-reflex#16071
[url]https://myl8test.files.wordpress.com/2016/11/p1070570.jpg[/url]
Please, tell me how.
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Yes, my blog has much more info but isnt finished yet. If you want to remove the driver, the only way is to remove to plastic ring surrounding it, then you can get at the six screws. You can do this with a fingernail under the inner side of the ring but it means crushing the rubber on the driver a little to do it. A plastic tool would be better. Maybe you'd have to make such a tool - melt the tip of a plastic fork handle? The ring lifts out like a speaker grille.
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I used my fingernail and that worked fine.
An externally hosted image should be here but it was not working when we last tested it.
Off course I did the same but the rings were very well glued?
Well, the sound now is incredible, once my second system is free of all kinds of noise and I have uploaded the bias of the amplifier.
I try again but there is no way without having to use a tool, which will damage the plastic ring 🙁
Well, the sound now is incredible, once my second system is free of all kinds of noise and I have uploaded the bias of the amplifier.
I try again but there is no way without having to use a tool, which will damage the plastic ring 🙁
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So to summarise, you could get it right by changing the crossover (?) To blame the presence of the Zobel elements would be oddly specific.
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