model S513i “pastoral”, current-mode control amplifier with remote.
model S514i “rhapsody”, dual monaural power amplifier. (eqv S505i)
●model S513i control amplifier with remote
- 3 line input (2 x current/0 ohm 1 x voltage/20kohm), 1 line output (current)
- LED indication (1/red, 2/green, 3/blue)
- dimension 202 x 202 x 45 mm
- +10 dB current amplifier to drive power amplifier efficiently
- 32 steps, electronic control attenuator (output current limiter)
AC100-120/220-240V linear power supply (built-in)
- no operation button except power switch
remote commander: rotary volume, line input select (cigarette box size)
●model S514i dual monaural power amplifier
- current-mode input x 1, impedance 0 ohm
maximum 25 watt
- dimension 102 x 202 x 50 mm
- no operation button except power switch
sound impression :
very real, rich, full-bodied, smooth reproduction.
can enjoy musical tone
wide dynamic range, well balanced bass to treble, overtone-rich
correct phase, wide stereophonic
this sounds like a tube amp
these amps have less non-linear stages, the sound is open and no suppression.
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According to the detailed description, the power output signal is probably a voltage.
http://sparkler-audio.com/portfolio/S513_S514_en.html
model S513i ― Control Amplifier
Amplifier: Fully discrete, 7 BJT linear current amplifier
model S514i ― Monaural Power Amplifier
Amplifier: Fully discrete, dual JFET + 9 BJT, high slew-rate design <= ???