I would like to create a dummy load for this so-called "Deacy Amp":
This is a low power germanium transistor / transformer driven push-pull amplifier for driving a small 4 ohm or 3.2 ohm speaker. After playing around with this circuit for a day it seems it is sensitive to the load. So my question is, what is the best way to load this amp in a way that will yield a complex frequency response. Ideally I would like to see a lot of middle frequency with notches and dips and peaks and so on.
I don't care if the load makes a little noise so enclosing a small 4 ohm speaker in a sound-resistant box is fine.
Another idea, that may be wildly misguided, is to take two 8 ohm speakers wired in parallel and mount them face-to-face possibly right against each other. How would this affect the frequency response of the amp's output? Would it increase the load or cancel it or magnify the complexity or have no effect or what? What if I used two slightly different speakers?
Another idea is to use these "tactile transducers" which are effectively voice coils without the cones:
I could attach these to plates of different sizes and weights sandwiched together with foam spacers to dampen the sound. The impedance of each plate would increase at it's resonant frequency and allow me to create a wide variety of frequency responses.