Current-feedback......well, not sure what Marantz means. In the world of op-amps and engineers, the exact meaning of current-feedback isn't something that everyone agrees upon. Some use it to describe the type of feedback loop, and a though explanation is beyond the scope of this forum.
Some refer to it as a type of op-amp, that has one of its inputs a low-impedance, as the terms used to ascribe its characteristics is not a voltage gain, but a transresistance.
Yeah, I know......what does that mean to the average consumer.
Precisely nothing. My bet is that someone on the marketing department thought up something that they thought sounded cool enough to differentiate them from the competition.
In order to know which, if any of those they mean, one would have to look over the schematic.
In either case, it is not something that would automatically lead one to believe that any amp using such technology is better than any other kind.
What most of us call "current-feedback" is the latter. Yes, it is used when the designer needs to keep BW high, regardless of gain. The drawback is that the resistors in the feedback loop need to be very low resistance. Which in turns means you have to use a non-inductive resistor, that can dissipate several watts. Amps made this way are usually few. Rowland made one......late 90s.
Some refer to it as a type of op-amp, that has one of its inputs a low-impedance, as the terms used to ascribe its characteristics is not a voltage gain, but a transresistance.
Yeah, I know......what does that mean to the average consumer.
Precisely nothing. My bet is that someone on the marketing department thought up something that they thought sounded cool enough to differentiate them from the competition.
In order to know which, if any of those they mean, one would have to look over the schematic.
In either case, it is not something that would automatically lead one to believe that any amp using such technology is better than any other kind.
What most of us call "current-feedback" is the latter. Yes, it is used when the designer needs to keep BW high, regardless of gain. The drawback is that the resistors in the feedback loop need to be very low resistance. Which in turns means you have to use a non-inductive resistor, that can dissipate several watts. Amps made this way are usually few. Rowland made one......late 90s.