Neptune II



With the Neptune Mk2, Spectral Audio is again tickling out the best of the Analog Technique - three temperature stabilized Voltage Controlled Oscillators, the 24dB transistor cascade filter, the huge LFO range, its modulation flexibility, the envelopes and the transistor distorter section are speaking for itself.

Excellent technique in a 2 unit 19" rack case with deep blue front panel.





TECHNICAL DETAILS Neptune II

Feature:

  • 3 VCO with Range 0.14Hz .. 7kHz, used up to 5.3kHz
  • Sawtooth and Pulse Wave on OSC1 and OSC2
  • Sawtooth, Triangle, Pulse, Random on OSC3/LFO
  • OSC3 switchable as LFO
  • Noise Generator with Spectrum DC..100kHz
  • Octave Switch for OSC2 with range 32' .. 4'
  • Octave Switch for OSC3 with range 64' .. 8'
  • Slide
  • Sync of OSC2 to OSC1
  • External Signal source
  • True Ringmodulator
  • Mixer section
  • 24dB Cascade filter with Lowpass and Highpass
  • Self resonant
  • Keyfollow switch 0-50%-100%
  • Four Modulation targets of OSC3/LFO: Mixer, Cutoff, OSC1, OSC2
  • Six shapes of OSC3/LFO: Sawtooth, Triangle, Pulse, Random, Noise and OSC2 signal
  • Free run switch to have OSC3 free of the keyboard
  • Filter and Volume envelopes where Filter envelope can be positive or negative modulated
  • Distortion section with regular Distorter and Fuzzer
  • Volume
  • Power switch
  • Power on led

MIDI:
  • Learn switch for MIDI Channel and Reference note
  • Gate LED
  • Slide switchable over Controller
  • LFO MIDI Clock Sync
  • CV and Gate In/Out
  • 5 Octave Range precise MIDI to CV Converter
  • interpret Pitch bend and Sustain
  • Cutoff and Modulation Controller with MSB and LSB
  • Pitchbend Range over Controller
  • MIDI Timing Clock 1/1 note up to 1/32 note
  • MIDI Thru with signal regeneration

Performance:
  • Quality smooth potentiometer
  • Soft touch knobs
  • High efficiency 5mm Leds, three green/one blue
  • 2.2mm travel push switches for optimal optical feedback
  • Anodized colored 3mm Front Panel
  • Pure DC Design means no capacitors in the signal flow
  • Low noise design
  • True noise generator (not digital noise)

Additional manual change possibilities (described in the Service manual) :
  • Having PW(M) on Square Wave on Osc1,2 or 3
  • Osc3 Sync with Osc1 or Osc2
  • Even faster Envelopes
  • Increase tune range for Osc1..Osc3
  • Additional signal inputs and outputs (i.e. to work with your modular system i.e.)
  • General in/outputs of Oscillators, Envelopes, Filter, Ringmodulator and much more











Click to enlarge
      		Audio Demos (all mp3)
[ beginning ] (1.2MB)
[ E2 ] (1MB)
[ neptune2_filter_fm_osc3 ] (776kB)
[ slow ] (131kB)

Performance and Signals of Neptune Mk2

Saw 250 Hz
 Saw Spectrum
Noise Signal
 Noise Spectrum 10Hz..50kHz