imran27
100+ Head-Fier
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- Sep 22, 2014
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No no.I know, but in a previous post we spoke about the O2 and NJM4556A I guess and per O2's creator this "slow" op-amp is able to rise a 10kHz square signal with12.65 volts in 3.51 uS, so this means a slew rate of 3.6 V/uS; basically V/uS is what defines the ability of an op-amps to rise or fall a signal.
What indeed can change the "flavor" of an op-amp used in output buffer would be the pre and post ringing and usually faster op-amps might have trouble with some capacitive longer cables of the headphones. However, this is something that can be checked with a scope with a resistive load in parallel with a small non-polarized cap. Some people do prefer the sound that has lot of pre/port ringing because this creates sort of a better soundstage under some circumstances.
I am not talking about slew rate at all.
I am talking about large signal step response.
OPA1652 has a slew rate of 10V/uS and OPA2209 has a slew rate of 6.4 V/uS
But look at the large signal step response, OPA2209 is faster by a factor of more than 2. Rise time is ~0.4us for OPA2209 vs ~1us for OPA1652 even though OPA1652 has a higher slew rate.
Pick any opamp which has comparable CMRR (to any reference opamps for comparison) but a lower rise time, faster settling time and low overshoot. You will consistently see that it has higher fidelity, especially with IEMs.