Timpani...The "simple network" that I suggested is the "current feedback" which you mention.
Current source/Voltage source, and like questions
In another thread there has been some discussion of power amps configured to deliver current proportional to input signal, rather than the more common voltage proportional to signal. A voltage amp's current varies with the load (speaker) impedance. Is this really bad? After all the speaker designer developed and evaluated his product with this effect in mind.
It seems to me that a simple network could be used to make a voltage amp function as a current amp. The input signal would be compared with the voltage across a current sampling resistor in the return leg of the speaker circuit, and the resulting modified signal used to drive the amp. Furthermore, the amp could be made to function as voltage or as current, and anywhere in between, by use of a potentiometer. This would provide hours of fun for curious audiiophiles.
In a similar vein, I recall so-called "ceramic" phono pickups, which had a piezo crystal to generate signal instead of a coil of wires. Most of these were very cheap items used in low cost record players, but there was at least one model that was comparable to good MM pickups. The interesting thing is that the piezo pickup signal is a function of stylus deflection (position) whereas a dynamic pickup signal is a function of the rate of change of stylus deflection. However, either type of pickup could play the same groove and yield similar sound. Which one is "right"? Perhaps neither.
It seems to me that a simple network could be used to make a voltage amp function as a current amp. The input signal would be compared with the voltage across a current sampling resistor in the return leg of the speaker circuit, and the resulting modified signal used to drive the amp. Furthermore, the amp could be made to function as voltage or as current, and anywhere in between, by use of a potentiometer. This would provide hours of fun for curious audiiophiles.
In a similar vein, I recall so-called "ceramic" phono pickups, which had a piezo crystal to generate signal instead of a coil of wires. Most of these were very cheap items used in low cost record players, but there was at least one model that was comparable to good MM pickups. The interesting thing is that the piezo pickup signal is a function of stylus deflection (position) whereas a dynamic pickup signal is a function of the rate of change of stylus deflection. However, either type of pickup could play the same groove and yield similar sound. Which one is "right"? Perhaps neither.