high fidelity

from The American Heritage® Dictionary of the English Language, 5th Edition.

• noun The electronic reproduction of sound, especially from broadcast or recorded sources, with minimal distortion.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

• noun An electronic system that reproduces a given sound or image with relatively high accuracy.
• adjective of a sound system Characterized by minimal distortion.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

• noun the reproduction of sound with little or no distortion