Grace Design Model 901 Reference Headphone Amplifier
Detail and Nuance - Grace Design presents the model 901 reference headphone amplifier, designed to provide engineers and musicians with the finest quality headphone amplification available for tracking, mixing and mastering.
Born of the same inspiration and attention to detail as Grace award winning microphone preamplifiers, the model 901 is a truly unique tool designed to help studio professionals achieve better results and hear the music like never before.
The model 901 headphone amplifier was designed with difficult to drive, low-impedance headphones in mind. With its high current transimpedance output amplifier, the 901 controls the transducers in your headphones with dramatically better accuracy and resolution than the amplifiers in a typical console, recorder, CD/DVD player or sound card.
The 901 hosts analog and digital inputs which make it convenient to monitor from several sources and the 901's ultra precise volume control ensures that you will hear your recordings with true stereo balance at any monitor volume.
Simply put, the model 901 is able to present a sound field so well balanced and articulated, you will discover new details and nuances in familiar tracks you have never heard before. Now imagine how this will empower your ability to hear and manipulate subtle, yet critical elements in your work.
Specifications
GAIN
Normal Mode: +10dB
Boost Mode: +20dB
FREQUENCY RESPONSE
@ 0dBu out +/- .25dB: 22Hz - 120kHz
@ 0dBu out +/- .5dB: 12Hz - 260kHz
@ 0dBu out +/-3dB: 4Hz - 600kHz
MAXIMUM OUTPUT LEVEL
@1kHz, 50 Ohm load: +23dBu (10.9Vrms)
IMPEDANCE
INPUT: 40K Ohms balanced; 20K Ohms unbalanced
OUTPUT: 1 Ohm
DYNAMIC RANGE
@ 0dB gain: 116dB
@ -10dB gain: 121dB
DISTORTION (THD+N)
+10dBu out, 50 Ohm load: 0.0051%
DISTORTION (SMPTE 4:1)
+10dBu out, 50 Ohm load: <0.012%
ATTENUATOR CHANNEL MATCHING
24 position switch: <0.05dB
D/A SPECIFICATIONS
Input sample rate: 32, 44.1, 48, 88.2, 96kHz
THD+N
44.1kHz, 24-bit, 1kHz, +20dBu out: 0.0016%
NOISE FLOOR
0dB gain, 22-22kHz: -95dBu
0dB gain, A-weighted: -102dBu
POWER REQUIREMENTS
115VAC: .16A
230VAC: .08A
