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  1. P

    Simple Attenuators - Design And Testing

    So, after more analysis, I've come to the conclusion that trying to recreate the resonance hump as an inline attenuator is not practical/possible. This is due to the way the cab/spkr load interacts with the reactive/resonance load. If they are not matched, exactly, you get multiple resonant...
  2. P

    Simple Attenuators - Design And Testing

    You can see the amp output Z, spkr output, vs NFB in this image. The lower green line in outputz is with standard 820 ohm NFB resistor. I stepped it 820, 2.2k, 1T (e.g. no NFB). The changes in amp Z are small but you can definitely see the effect how it reacts less to the spkr impedance...
  3. P

    Simple Attenuators - Design And Testing

    Mayhap, since this is a simple attenuator, all of this resonance circuit stuff is pushing it out of that classification. The M2 sounds good as is and adding a resonance peak may not be worth the effort or $. Not to mention, if the peak were ever to be too high it could present a reflected...
  4. P

    Simple Attenuators - Design And Testing

    There doesn't seem to be any noticeable difference when listening to the clips. Since the resonant hump is recreated at the spkr this may be enough ... from a listeners perspective? Having the resonance at the amp would, in theory, recreate the reflected impendance seen by the output stage...
  5. P

    Simple Attenuators - Design And Testing

    I'll throw the PI (long tail pair) into the tube output only sim. Then I can have the NFB as well. Once I get that in I'll see what happens when I drive it harder. Not sure what the models do in that case to be honest. Even for clean signals at the low end the resonance being present would...
  6. P

    Simple Attenuators - Design And Testing

    @JohnH I'm using a generic 8ohm speaker model ... as you have posted here (from aiken?). The signal tracks pretty well ... but you have to tweak the resonance values to match the speaker or you can get multiple/offset peaks at the different resonance frequencies. I tweaked the resonance...
  7. P

    Simple Attenuators - Design And Testing

    Heres a grab with the full deluxe reverb showing impedance @ the amp and output dB at the speaker.
  8. P

    Simple Attenuators - Design And Testing

    Hey all! I've been investigating various load boxes/attenuators for a while now. I'm currently using mesa boogie mark Vs ... 35W, and the big boy. I also have a Helix HX stomp ... which is pretty sahweet. I get great sounds from that thing. Regarding the Mesas ... I say they are the Fender...

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