Sparkos SS3602 Opamp Rolling In Fosi P4

[solderdude]

Do you understand that there's an output stage between the op-amp and the output?

Noise data were presented. Did you miss those? Determined by the output stage, of course.

This is a pre-amp... unlike the power amps with TPA3255 this one is op-amp only.
Still, given the small differences measured I can't help but wonder if the little SMD opamp is always in circuit (even when tone control is defeated).
The replaceable op-amp may well only be the output stage.

Which can also be measured:

• DC offset / DC level at the output

The frequency response suggests it is not DC coupled. Could be at the input, could be at the output, could be in the feedback loop.

• common mode rejection rate of the input (imported noise by cabling)

It is RCA in...

• noise floor especially at very low frequencies (< 100Hz)

Below 100Hz the hearing is VERY insensitive.

• input resistance: possible impacts on level, frequency response and dc offset when sourcing from a source with high output resistance (100+ Ohm)

Could be tested,

• output performance on difficult loads (600 Ohm) and/or on high output levels (power supply headroom, slew rate, max power)

How many amplifiers (it will be connected to) will have such unusual low input impedance, let alone difficult ones ?

• power consumption and as consequence heating based performance degradations (eg. drift)

Amir could have made a FLIR shot after an hour or so.

 

[antcollinet]

Do you understand that there's an output stage between the op-amp and the output?

Noise data were presented. Did you miss those? Determined by the output stage, of course.

Not to mention....

CMRR and input impedance - close to 100% dependent on the circuit, not the opamp.
Power consumption of the preamp will be mainly depending on the circuit overall. The op amps will consist of only a part of that.
Noise is already in the measurement in the OP.

 

[Count Dacula]

Just because you can do something, doesn't mean you should.

 

[DavidM1]

Just because you can do something, doesn't mean you should.

Lol. This is not an attitude that made anyone rich selling hifi accessories.

Now, where did I leave my doorstop electron stabiliser?

 

[gamerpaddy]

there are kinds of people out there that just resist being educated or believe common sense is a bad thing.
these are the kind of people im not having a issue selling a 1000$ power cord to