GLENN YOUNG: The Audio-gd HE-1 preamplifier is one of the three best preamplifiers I’ve ever heard. It creates an acoustic space like no other component. Despite the spatial goodness, the HE-1 avoids coloring the sound. Not to be missed! Read the full review https://hometheaterhifi.com/reviews/amplifier/audio-gd-he-1-stereo-preamplifier-review/