consistent
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Posts posted by consistent
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Hi
I thought Al revised this network for the woofer value of 5 ohm not 4 ohm (mH: 2.4 instead of 1.3 and uF: 30+1 instead of 39+1 with 62 instead of 39) and respective change for the mid was placing a 10 ohm resistor across the autoformer instead of 5.6 ohm and a coil 2.0 mH instead of 1.3mH
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When I look at pictures of the NEW Jubilee is reminds of this mod done some years ago! Interesting to say the least!
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maybe they had some spares lying about to make it fit the need
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When I look at this network again it really is an interesting piece of work. Looks like they use LWR 2nd order to cross the woofer at around 320hz and at the top end a 2nd order Cheyby at around 6400hz. Not sure about the mid...got me stumped!!
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The B3 has been given a 'facelift' by a few...in the tweeter circuit from memory found somewhere in the forum
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...I do agree with the cost aspect, to me that is the driver in using simple and cheap resistors instead of autoformers!
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I agree with Curious George...I have designed L-Pads and used autoformers and compared...the resistors in an L-pad destroy the 'cleanliness' that the autoformer provides! If you wish to change the values to even out various speaker resistances (more precise matching of drivers) just use a good resistor to 'swamp' the autoformer.
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I was corresponding with Bob Crites some years ago on damping and sticking in bits of wood to strengthen the CW cabinet and ultimately his Cornscala. His research suggested there was not much of a difference electrically, graphically and using one's ears. I did my own testing when I built my Cornscala (two boxes/sizes) and the difference was negligible. Significant difference however comes with playing with the network!
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follow this thinking diagram of alk cornscala network - Bing images which changed over time when Al realised that the woofer was around 6 ohms at crossover
cheers
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G'day from Mandurah
I stuck with Crites design specs but built with 25mm MDF, did some bracing but used the Roger Floth Equalizing the Klipsch Cornwall.pdfwhich seemed to improve bottom end tightness/response however designed a Bessel network to work with this mod.
Anyhow good luck and have fun
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Yep Cardas Quad...I have used a few types but this one melts best, easier to work with and holds a stronger bond IMO
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If you want to go all out http://www.azurahorn.com/ exceptional horns
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Agree with CANT on his choices and the REVIEWS from HUMBLE helped in the choices I made. I was hooked onto Sonicaps (18 years ago) when developing pre-amps then used them in xovers and doubt very much the more expensive stuff will make a difference
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I think you have the 'old values' for Al's network. New values reflect the acknowledgement of a 6 ohm woofer at the xover where the 1.3mH is swapped for a 2.4mH and 39uF for 62uF. Also swap out the 39uF for 30uF and 1.3mH for 2mH. The 5.6ohm resistor across the autoformer is adjusted to 10ohm.
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Go to Humble HiFi http://www.humblehomemadehifi.com/Cap.html his capacitor tests are legendary
cheers
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I'd first try better room setup/placement (as Preston Tom suggests) of the boxes and your seating position. You may have succumb to a 'bass suck-out' point. Lots of stuff on room setup on Google, Cardas Room Setup or CNET -how to position your speakers; being some! It some times can be a jaw dropping experience by moving them a few inches, it can also be a painstaking exercise but definitely worth it.
all the best
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you will need a new crossover I would think to match SPL/performance with K33 and K77 (even if you go two-way without the K77)
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If you like what you hear don't change it until something needs changing. Listen to them for a few months then ask the question again.
Happy listening
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Check Bob Crites https://critesspeakers.com/prices-other_stuff.html his woofers are great
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If you liked the sound of the F3 then you will love the CWIV sound, it is much deeper/cleaner and a step up in realism. The LS2 will not go as deep as the CWIV and is very room dependant - it loves big rooms to shine
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ALK B Crossover Question
in Technical/Restorations
Posted
oh...it obviously dropped the crossover to around 513hz, both revisions appear to have used a Cheyby 2nd order instead of Butterworth