Low damping factor but fast& high current SS amps?


fine, fast, warm, fullbodied, cohesive, coherent, great timing

100W minimum, damping factor lower than 100 at 8 Ohms - better options than krell ?
zuio

Showing 2 responses by bombaywalla

Looks like this thread go side-tracked into a 101 on definitions. LOL! :-) Anyway, it was an interesting read & a good refresher for me as well.

Now, to address Zuio's issue: I'm not sure that low damping factor (DF) & fast + high current can co-exist. DF is an indirect measure of an amp's output impedance so if you assume 8 Ohms nominal speaker impedance then higher the DF, the lower the amp's output impedance.
An amp's output impedance is a function of the amp's bandwidth - the higher the bandwidth, the lower the amp's output impedance will remain. If the amp's bandwidth decreases, the amp will not be able to follow the music signal & we get distortion & increased output impedance.
If output impedance increases, it will limit the amount of current that can be delivered to the load as more will be dissipated as heat in the output impedance.
So, I believe that high DF indirectly let's us know that the amp is trending towards high bandwidth (fast) & will be capable of high current delivery (if it's power supply is able & the music signal demands it). Correct me if I'm wrong. Thanks.
Liguy,
that was my quote, just FYI.
as you correctly alluded: slew rate & bandwidth are related.
You also know that Q=i*t=V*C. so, V/t = I/C. So, slew rate can also be spec'd in terms of how much current into charging/discharging a capacitor.
Damping factor is an indirect measure of the amp's output impedance.
Needless to say, if an amp has higher output impedance (i.e. low DF) then it's more unlikely to supply higher current into the load (as most will be dissipated as heat).
So, there is a relationship between the two.