Do I need an op-amp after the DAC?

Question

Electronics

We have a DAC with a voltage output, an op amp and a PA with a huge input impedance, above 100 kOhm.
I want to connect a regular RC low-pass filter to the DAC, and feed the received signal to the PA. While on the network it is often recommended to connect a low-frequency filter to the op-amp to the DAC, where there are a resistor and a capacitor in the feedback circuit. The question arises, can I do this:

or do I definitely need to do this:

.
The essence of the problem is that, for reasons of audiophilia and considerations of simplifying the printed circuit board, I would not like to install an op-amp, and the filter on the op-amp is phase-nonlinear, KMK.
UPD: in all cases described, the input impedance of the next stage will be higher than the output impedance of the previous one.

Answer 1

The frequency response of the filter on the op amp falls off much steeper than that of the RC chain. Simply put, the RC chain in this story may not be suitable.

Answer 2

• As Victor pointed out , an op amp can be an integral part of a DAC. And, in many cases, it is. Those. what kind of DAC and what is its load capacity?
  
• The phase response of an RC chain is also non-linear.
  

Answer 3

It is logical to put an opamp in front of the ADC in order to raise the quality factor of the read signal at the input in order to register it.

Answer 4

It's possible, I did this once, but ....
The question is sorely lacking in specifics, what kind of DAC and VCL? The DAC can be with oversampling and does not require a high order of filters, the amplifier can be on germinium, or covered by feedback, don’t play around, but here the specifics are important or the reflected spectrum will disable the VCL ...
In general, if you really want to try it it is possible and even necessary, but you need to understand the nuances :-)
Oversampling was invented for this, in order to radically simplify the filter.