Yes, you want to find a speaker with a flat sound signature.

This is a type of speaker called "studio monitor".

Remember that sound is very unforgiving when working with it, every single step in the chain of recording a sound to playing it back can change how it sounds, with the changes to the sound being compounded when you play it back.

This includes the microphone, the microphone amplifier, the speaker amplifier and the speaker.

This does not mean that it is impossible to do what you want, but be prepared that the sound may sound strange from what a normal stethoscope would produce.