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  1. I

    Simple Attenuators - Design And Testing

    Really nice investigation auflauf, thanks for these tests! I'm glad you like my attenuator and I'm happy it does exactly what it is supposed to do. However, I'm wondering if you can really rule out that the low frequency increase at high attenuation levels (e.g., green line in the normalized...
  2. I

    Simple Attenuators - Design And Testing

    Hi John, great you're never getting tired of working out further evolutionary stages of the attenuator. Even though for me that's not the most elegant approach as it involves many parts, it's a really nice idea and it's good to know it would work like this. It's great your publishing all those...
  3. I

    Simple Attenuators - Design And Testing

    Yes, on an amps input it is totally recommended. Otherwise you'll have a floating high impedance node picking up all the noise when no cable is plugged in. Good luck with the build! :)
  4. I

    Simple Attenuators - Design And Testing

    I would like to stress that it is probably best not to switch any of the tips to ground when nothing is plugged in. 1.) It does not have any impact on the noise as there's no active high impedance circuitry involved in the circuit. 2.) If used as a load you don't want the output jack's tip to be...
  5. I

    Simple Attenuators - Design And Testing

    Yep, simplicity is a good point. I think I'll leave it like it is for now. I can easily attach my 8 Ohm 150W dummy resistor (wired in an enclosure with jacks) and have the option to switch between reactive and resistive loads by using the bypass switch. In the reactive case the dummy resistor...
  6. I

    Simple Attenuators - Design And Testing

    Quick update: Tonight I installed a 10k 2W resistor in series with a 10k pot (only had a 16mm on hand but will change for a 24mm after I did some testing) and tapped the signal from the pot off into the interface --> garageband with Torpedo Wall of Sound. Signal is tapped directly at the input...
  7. I

    Simple Attenuators - Design And Testing

    Hi John, thanks so much for your elaborate response! You're right, the inner flange on the long sides of the enclosure was a bit in the way for some mounting ideas I had. However, I really like those Hammond boxes and I got two of these for relatively cheap, so that's why I went for it. I...
  8. I

    Simple Attenuators - Design And Testing

    Hi! I finally had the time to build the attenuator. A great piece of gear, thanks a lot for all the information on this thread and all the experimenting which went into this project! I built the M2 8 Ohm version using large robust APEM switches, including a bypass switch. Enclosure is a Hammond...
  9. I

    Simple Attenuators - Design And Testing

    @JohnH thanks a lot for this diagram! I'll wrap my head around the different options and keep in touch :-) I'm actually leaning towards the standard 8 Ohm version at the moment. Thanks a lot so far!
  10. I

    Simple Attenuators - Design And Testing

    Hi @JohnH and @Gene Ballzz , thank you very much for sharing your thoughts! With respect to the inductor, I see that it would make sense to get the right value. I mean it probably depends on the impedance of the actual speaker you want to replicate, but I guess your design is very well tested...
  11. I

    Simple Attenuators - Design And Testing

    Hi everybody, I came to the MarshallForum after I stumbled upon information about this gorgeous attenuator design by John and have since read quite a lot in this topic. I've built some amps so far and always wanted to find a nice attenuator design that wasn't too complex. I was about to build an...

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