Voici ce que sa dit dans les description du UB502:
# Ultra low-noise ULN design, highest possible headroom, ultra-transparent audio
#
1 new state-of-the-art, studio-grade IMP “Invisible” Mic Preamp with:
* 130 dB dynamic range for 24-bit, 192 kHz sampling rate inputs
* Ultra-wide 60 dB gain range
* Lowest possible distortion 0.0007% (20 Hz - 20 kHz)
# Effective, extremely musical 2-band EQ and peak LED on mono channel
# 5 balanced high-headroom line inputs
# State-of-the-art 4580 operational amplifiers provide lowest noise and distortion—better than 4560 op amps
# Main mix outputs plus separate headphones and stereo tape outputs
# Tape inputs assignable to main mix or phones outputs
# High-quality sealed rotary controls from ALPS® for long-term reliability
# External power supply for noise-free audio and superior transient response
# Extremely rugged steel construction ensures long life even under the most demanding conditions
# Manufactured under ISO9000 certified management system
Source:
http://www.americanmusical.com(...).html