RAAL-requisite HSA-1b User Manual

INTRODUCTION:

The HSA-1b Headphone & Speaker Amplifier provides Direct-
Drive amplification for True-Ribbon Earfield Monitor
headphones, hi-efficiency speakers, conventional dynamic and
planar magnetic headphones.
HSA-1b
Primarily, the HSA-1b amplifier was designed to drive ribbon
based headphones (low impedance hence high current
demand). It can drive classic type headphones with impedances
in the 20 - 600Ω range. The desirable sensitivity of the classical
HEADSET AND SPEAKER AMPLIFIER
type headphones should be in the range of 92-100dB so that the
declared sound pressure levels and acceptable s/n ratios could
USER MANUAL
be achieved.
Sound quality and tonal balance, which are of highest standard,
are not reduced when headphones outside of the recommended
sensitivity range are used, Signal to noise ratio is at a required
level and will never be compromised with any side effects which
could occur when high sensitivity (100dB and above)
headphones are used.
Input Options include: Single-Ended (unbalanced) RCA, True-
Balanced 3-pin XLR with 3-position DIP switch providing 0dB,
-6dB and -10dB input sensitivity.
The HSA-1b also includes a precision 24-step volume attenuator
for rock-solid left/right balance throughout entire dial range.
We sincerely appreciate your trust in our work, as evidenced by
your purchase, and hope you will benefit by a lifetime of
beautiful music and joyful ownership.
Happy Listening,
Alex Radisavljevic
Danny McKinney