KEF LS50 - for David@FrankHarvey | whathifi.com
http://www.high-endaudio.com/RC-Speakers.html...Not a surprise for me, while I strive to get best of everything, but this might surprise some of you...
Cheers!
http://www.whathifi.com/search/apac...rt=is_field_star_rating desc&retain-filters=1
RAART, am I being particularly dim? I really have no idea what you are trying to achieve here. Upgrading components, or redesigning the crossover? Why should we read all those PDFs, what are we looking for?
I saw enough to suggest you could try some proper rolloff on the bass, say, 12uF, and a second order tweeter crossover of about 4.7uF and 0.3mH. It should sound completely different and phase might be very good.
Then you could add a Zobel of maybe 6 ohms and 1uF to the tweeter for the smoother top end, but exact values depend on the Re of the tweeter and its inductance.
I saw enough to suggest you could try some proper rolloff on the bass, say, 12uF, and a second order tweeter crossover of about 4.7uF and 0.3mH. It should sound completely different and phase might be very good.
Then you could add a Zobel of maybe 6 ohms and 1uF to the tweeter for the smoother top end, but exact values depend on the Re of the tweeter and its inductance.
Hello Steve,
sorry that I might be slightly elusive to you but I thought that I was clear. Anyway after looking again at original iQ30 x-over I decided to leave it intact as it is and built new one and then compare the sound between those two just to see how big will be sound improvement.
While KEF confirmed that the mid-bass driver in iQ30 is the same like in the XQ20 but they do not say anything about the tweeter. While XQ20 has more developed "audiophile" x-over (as per KEF) I was looking to get the hands on the service manual for XQ20 and get the schematics of XO and then start from there to build a new one. Unconfirmed sources all over the net claims that they use in the iQ30, XQ20 x-overs and also they changed components to high quality ones, but everyone is keeping values/schematics for themselves and not willing to share. I assume that they paid for it and want to keep value of the speakers high. I understand this, however will not give up until I get those schematics.
For now I got XQ30 and XQ40 schematics and the XQ line should have similar networks, just customized for the specific model.
At the end I probably will have 3 different x-overs... Original one, same design as the original but modified and XQ line design and modified. While this will go heavy on my budget I will try to keep the cost minimized. Anyway I hope that now I am clear for everyone.
The reason I posted all those files above is that maybe someone will need them... and I like to help as long as I can be helpful... and I might get some suggestions too...
All the best to everyone here...
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iQ30 cross over mod
I bought a pair of these after they were discontinued, just replaced the two tweeter caps with poly ones, it is well worth it, made a big difference. The speaker sounds much cleaner, with longer decay (i like jazz & classical) It is a pain to get cross over off the stand offs, but is possible.
I bought a pair of these after they were discontinued, just replaced the two tweeter caps with poly ones, it is well worth it, made a big difference. The speaker sounds much cleaner, with longer decay (i like jazz & classical) It is a pain to get cross over off the stand offs, but is possible.
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