The microphone preamps have a significant impact on the quality of the recorded audio. The DR-701D features TASCAM HDDA mic preamps. The differential mic preamp circuits use discrete architecture, built with carefully selected components. For example, Texas Instruments OPA1652
op amps were selected for their high quality and low noise ? with even better audio performance than the previous DR-70D model. As a result, the unit boasts an equivalent input noise of -124 dBu or better.
The A/D converters, which convert analog signals to digital, are made by Asahi Kasei Corporation and are equivalent to those used in the top models in the TASCAM DR series of linear PCM recorders. High audio quality HDDA circuits faithfully convert the amplified audio to digital. Resolutions up to 96kHz/24-bit are supported when recording 6 tracks and 192kHz/24-bit when recording 2 tracks.