Evolvo Posted August 13, 2011 Share Posted August 13, 2011 Hello, I was wondering if there are any difference between a 1966 and a 1972 PWK H-700 Heresy? Are the drivers the same, the crossover and all the other components? Is one better than the other? Quote Link to comment Share on other sites More sharing options...
Malcolm Posted August 13, 2011 Share Posted August 13, 2011 Only difference is the woofer. IRC 1966 should have an Electrovoice SP12B for the woofer, 1972 should have a CTS woofer. Otherwise, same squawker, tweeter and Type C network. One could argue that the EV woofer is better than the CTS woofer, but I am sure that PWK would have told you that there isn't a dimes worth of difference. I have 1966 Heresys for left and right front, and a 1972 Heresy for a center and I cannot tell the difference. Quote Link to comment Share on other sites More sharing options...
MikeFord Posted August 14, 2011 Share Posted August 14, 2011 You don't notice anything different related to the whizzer cone on the SP12B? Nothing even subtle, or efficiency different? Quote Link to comment Share on other sites More sharing options...
Guest " " Posted August 15, 2011 Share Posted August 15, 2011 might be a crossover difference too. I think there was a type 4 and a type d. Quote Link to comment Share on other sites More sharing options...
Malcolm Posted August 15, 2011 Share Posted August 15, 2011 You don't notice anything different related to the whizzer cone on the SP12B? Nothing even subtle, or efficiency different? Nope. Mechanical crossover frequency to the whizzer is well above the electronic crossover frequency to the squawker. The whizzer doesn't do a thing. Sensitivty (efficiency) is similar. When sound pans from one side to other through center, it is seamless. Quote Link to comment Share on other sites More sharing options...
Malcolm Posted August 15, 2011 Share Posted August 15, 2011 might be a crossover difference too. I think there was a type 4 and a type d. W-1000-5000, or something similar, was used in earliest Heresys. There was no level matching between woofer and the hotter squawker and tweeter. And they squawker crossover was 1000Hz, not 700Hz. IIRC there was a Type 4 of some sort, maybe circa 1964. By 1966, Type C network was in use and provided level matching via autotransformer. Crossover to squawker at 700Hz. It was still in use in 1972, Type D appeared with the 8 ohm woofers and was quickly replaced by the Type E when Klipsch figured out that changing the phase of one of the components made the speaker sound better. Not sure exactly when either appeared anymore. Didn't they just start calling them Heresys instead of H700s around that time? Quote Link to comment Share on other sites More sharing options...
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