JoeB Posted July 3, 2006 Report Share Posted July 3, 2006 As I posted earlier I have a badly dented tweeter on one of my ‘new’ AR-3a speakers. I do have an 8 Ohm tweeter from an AR2 that looks identical to the AR3 tweeter but is higher impedance. I’m wondering just what the results of installing the 8 Ohm tweeter would be. The AR-3a factory tweeter setting is 1.75 Ohms (1 to which, using DC analysis techniques (ignoring the cap) should give about a 3.9dB reduction in output from full on (at higher frequencies). With 0.5 Ohms (1 to and an 8 Ohm driver using the same analysis technique, it looks like the output should be 0.8dB below full on. Adding the 3 dB reduction for an 8 ohm vs 4 Ohm driver, gives a gross match to within 0.1 dB. I then modeled the system in PSpice including the 6 UFD cap and found that using the 8 Ohm driver (modeled by an 8 Ohm resistor) would shift the crossover curve somewhat. Adding 16.5 UFD (2X33UFD in series) in series with the tweeter gives a pretty good match (within 0.2 dB) from 1 kHz to 100 kHz. I have attached the simulation schematic and probe results. Has anyone actually tried this? Is the only difference between the drivers the impedance?1400.pdf1401.pdf Link to comment Share on other sites More sharing options...
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