Al Klappenberger Posted January 24, 2004 Share Posted January 24, 2004 Guys, The pictures show how to convert an "AA" to an "A". Al K. Quote Link to comment Share on other sites More sharing options...
Al Klappenberger Posted January 24, 2004 Author Share Posted January 24, 2004 Guys, Here's the plots comparing the AA with the A. The green plot is the "A" and the black plot is the "AA". You dicide which is better. Since I am a snob, and a bit biased, I don't like either one of them! Al K. Quote Link to comment Share on other sites More sharing options...
bkrop Posted January 24, 2004 Share Posted January 24, 2004 Thanks for the pics! 2 questions... 1) is the black wire soldered to the outside of the can? 2) what about disabling the zehner diode, any pics? Quote Link to comment Share on other sites More sharing options...
Al Klappenberger Posted January 24, 2004 Author Share Posted January 24, 2004 bkrop, In the "AA", the black wire is the inductor. It is connected to the junction of the two 2 uFd caps (the wire that gies between them). To make it an "A", you simply disconnect the black wire and let it hang then move the wire to the other side of the left 2 uFd cap. That removes it from the circuit. All that is left is the right 2 uF cap. The Zener diodes don't do anyhting until the tweeter sees too much power. Unhooking them makes no difference at all in normal listening. I left them connected for both plots. Al K. Quote Link to comment Share on other sites More sharing options...
bkrop Posted January 24, 2004 Share Posted January 24, 2004 Thanks! I just thought that removing the zehner diode was the easiest tweek to do to the AA network. I think Kelly posted something (or someone else) today about this.... That is, it is only there to prevent overload with high power amps. Quote Link to comment Share on other sites More sharing options...
Daddy Dee Posted January 25, 2004 Share Posted January 25, 2004 ---------------- On 1/24/2004 6:30:46 PM Al Klappenberger wrote: Guys, Here's the plots comparing the AA with the A. The green plot is the "A" and the black plot is the "AA". Al, you are a funny man. I hadn't realized it was such a simple operation to change from AA to A. I could even handle that. On the plots of the A and AA. What would the listener discern as the difference. Any handholding appreciated. I'm not sure what I'm seeing on the plots. Thanks. You dicide which is better. Since I am a snob, and a bit biased, I don't like either one of them! Al K. ---------------- Quote Link to comment Share on other sites More sharing options...
Al Klappenberger Posted January 25, 2004 Author Share Posted January 25, 2004 Daddy, There difference is a few db more extreme highs for the A over the AA and a drastic reduction in extreme low rejection for the A. This will give a slightly crisper sound and increased distortion as the volume is raise. A tweeter will make considerable distortion when it see 2000 Hz. The A reduces 2000 Hz by about 15 dB compared to about 34 dB for the AA. The A also has more loss at 6000 Hz. I am not sure what this will sound like. Al K. ERROR: Above, I have changed 200 Hz to 2000 Hz! Quote Link to comment Share on other sites More sharing options...
JohnA Posted January 26, 2004 Share Posted January 26, 2004 Al, What is the scale along the bottom? Quote Link to comment Share on other sites More sharing options...
itsmyforte Posted January 26, 2004 Share Posted January 26, 2004 i'd take the AA just lookin at them. Quote Link to comment Share on other sites More sharing options...
Daddy Dee Posted January 26, 2004 Share Posted January 26, 2004 ---------------- On 1/25/2004 7:44:10 PM Al Klappenberger wrote: Daddy, There difference is a few db more extreme highs for the A over the AA and a drastic reduction in extreme low rejection for the A. This will give a slightly crisper sound and increased distortion as the volume is raise. A tweeter will only make distortion when it see 200 Hz. The A reduces 200 Hz by about 15 dB compared to about 34 dB for the AA. The A also has more loss at 6000 Hz. I am not sure what this will sound like. Al K. ---------------- Al, Thanks for laying that out for me. Quote Link to comment Share on other sites More sharing options...
Al Klappenberger Posted January 26, 2004 Author Share Posted January 26, 2004 John, The scale is 2000 Hz / div. from 0 to 20 KHz. THIS MEANS I SCREWED UP! What I said about 200 Hz above should have been 2000 Hz! Al K. Quote Link to comment Share on other sites More sharing options...
3dzapper Posted January 26, 2004 Share Posted January 26, 2004 Al, Tsk,tsk,tsk. I'm going to write this date down for it most certainly is a historic first. Has to rank right up there with the open air tungston filament light bulb. Rick Quote Link to comment Share on other sites More sharing options...
bkrop Posted January 26, 2004 Share Posted January 26, 2004 Hey, even Newton and Einstein were wrong on occasion! Quote Link to comment Share on other sites More sharing options...
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