allears4u.
Congratulations! Your obviously successful pairing of the Raven and Klipsch is an example of quality versus quantity which is a frequent topic in High End audio. Your speakers are high sensitivity and have an easy impedance load so they aren't difficult to drive.
The Raven amplifier is 1/9 the power of your previous amplifier yet sounds much better to you and your wife. I'd have to assume this is the result high quality output transformers/parts/wire and a very stout power supply. 20 watts but very high quality watts for certain.
Many people familiar with Klipsch believe they sound their best when driven by a good tube amplifier. Your comments seem to support this perception. I'm glad you took the chance and gave tube amplifiers a try in your home audio system. Tubes are capable of presenting a heighten sense/feel of naturalness or as you put it, realism. I hope you enjoy your Raven for many years.
Charles