moray james Posted June 6, 2012 Share Posted June 6, 2012 Roy/Trey: I am wondering if the Epic series is the only heritage vintage two way speakers to have CD compensation built into the crossovers? Is CD compensation only used in the CF3/4 or do all the models use it? Do any of the RF series have CD compensation designed into the networks? Thank you and best regards Moray James. Quote Link to comment Share on other sites More sharing options...
garyrc Posted June 14, 2012 Share Posted June 14, 2012 ...and what in the world would CD compensation look like? Would it be treble roll off or attenuation of the tweeter to mask digital harshness? I assume it is switchable. If it works, why don't other Klipsch speakers have it? A modest proposal: a four position switch so one can choose between FLAT, GOOD CDs, BAD CDs and TRULY TERRIBLE CDs. Quote Link to comment Share on other sites More sharing options...
PrestonTom Posted June 14, 2012 Share Posted June 14, 2012 Gary, I assume the term "CD" was referring to constant directivity of the horn's pattern of dispersion. Usually, with such horns the high end actually needs to be boosted with a shelving filter. I believe that is the compensation he is referring to. Quote Link to comment Share on other sites More sharing options...
moray james Posted June 14, 2012 Author Share Posted June 14, 2012 Preston Tom: thank you for fielding the question from Gary. I have only just checked back in here and found your two posts. You are correct in that I was referring to constant directivity horns and the shelving filter they require. I would imagine that the large RF series utilize CD horns but I am not sure which do and which don't. Thank you for jumping in here your assistance is much appreciated. Best regards Moray James. Quote Link to comment Share on other sites More sharing options...
Speakmeister Posted June 14, 2012 Share Posted June 14, 2012 Moray, Take the crossover in the KP-450 as a way that klipsch deals with constant directivity. The K-501 is CD and the K-60 driver needs EQ as its response falls off up high. KP 450 HF.pdf KP 450 HF.pdf KP 450 HF.pdf Quote Link to comment Share on other sites More sharing options...
moray james Posted June 14, 2012 Author Share Posted June 14, 2012 thanks. the drawing is confussing me a little, are there two T5A auto transformers used or does the drawing show the input and output side split? Can you give me the 101 walk through for crossover dummies? Is it the 4 uf cap which supplies the hf boost? appreciate your help with this. Best regards Moray James. Quote Link to comment Share on other sites More sharing options...
djk Posted June 14, 2012 Share Posted June 14, 2012 Two autoformers. Quote Link to comment Share on other sites More sharing options...
moray james Posted June 14, 2012 Author Share Posted June 14, 2012 Thank you Dennis. So are the auto transformers are being used as a tapped inductor? I am still in need of the 101 walk through for crossover dummies. A simple explaination would help a lot. Thanks again best regards Moray james. Quote Link to comment Share on other sites More sharing options...
garyrc Posted June 14, 2012 Share Posted June 14, 2012 Thanks, Preston Tom. Moray James sent me a PM explaining the reference. Thanks to both of you. As Roseanne Roseannadanna used to say on Saturday Night Live, "Nevermind." Quote Link to comment Share on other sites More sharing options...
djk Posted June 14, 2012 Share Posted June 14, 2012 "So are the auto transformers are being used as a tapped inductor? " No. The first autoformer cuts the signal broadband, the 25Ω series resistor gives some isolation, the second autoformer steps up the voltage at high frequency. Quote Link to comment Share on other sites More sharing options...
moray james Posted June 14, 2012 Author Share Posted June 14, 2012 Thank you Dennis: so how does the actual filter that sets the band the second auto transformers sees work? Best regards Moray James. Quote Link to comment Share on other sites More sharing options...
djk Posted June 15, 2012 Share Posted June 15, 2012 The signal is raised by about 6dB by the autoformer, so the impedance drops by a factor of about 4:1 at the higher frequencies. Factoring in the Le of the voice-coil at 20Khz, the cap sets the boost point at roughly 10Khz. I'm sure they tried different values before settling on 4µF. I heard the KP450 at a trade show in 1989, it sounded pretty good for what it was, but I would have liked to have seen a three-way with a mid-bass driver and a smaller HF horn. Klipsch was great, and even showed me the network diagrams for all the models I asked to see. Quote Link to comment Share on other sites More sharing options...
pzannucci Posted June 15, 2012 Share Posted June 15, 2012 Looks like the expensive (although better way due to impedance variations) of doing the resistor bypassed by the capacitor to raise the high frequency response when trying to do a 2 way horn. For some reason I didn't like this type of implementation for raising the high frequency so maybe Klipsch's use of autoformers would sound better. Quote Link to comment Share on other sites More sharing options...
djk Posted June 15, 2012 Share Posted June 15, 2012 Try a 2µF in series with a 40µH, in parallel with the series attenuation resistor in a two-way. It works with woofers up to about 100dB (90° x 40° CD horn), above that and it's back to the autoformer. http://www.jblproservice.com/pdf/Theatre%20Series/4670B.pdf http://www.jblproservice.com/pdf/Theatre%20Series/4671.pdf Quote Link to comment Share on other sites More sharing options...
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