Kurzweil K250 - Technical Specifications

Technical Specifications

• 12-track music sequencer, polyphonic, 12,012 events (with version 3 software and higher), fully editable including quantization (see Quantization (music)), section call, sequence chaining, punch-in/out, mute/solo/fader automation, event editing, channel stealing, rhythm change, tempo change, MIDI and tape sync.
• Tempo control, plus or minus up to 700 beats per minute (can be additionally manipulated if using the on-board sequencer), real time.
• Chorus (five different modes - doubling, full chorus, flanging, echo and microtonal) with delay and detuning capability (all editable and adjustable), switchable in real time.
• Transpose (five different modes - octave pitch shift, chromatic pitch shift, octave transpose, chromatic transpose and timbre shift); maximum range of 2 octaves up to 5 octaves down depending upon the mode selected, real time. Note - timbre shift is an application of the technology where the keymap is transposed one way and the pitch is transposed the other way so the pitch stays the same but the digital artifacts are used in the sound.
• Fine Tuning (center position is concert or standardized pitch A=440), real time.
• Brightness (of the sound), real time.
• Sound volume, real time.
• Volume swell, real time (see Expression pedal).
• Tremolo, real time.
• Vibrato, real time.
• Sound velocity, both positive (increase) and negative (known as reverse velocity), real time (see keyboard expression).
• Aliasing, real time.
• Pitch bend, up or down, real time.
• Touch sensitivity, real time.
• Two sustain modes, normal sustain and sustained release (which is a quick dampening of sound after a note is struck), real time.
• 96 non-destructive ROM sounds (basic sound block).
• 341 presets.
• 12 voice polyphony, 12 oscillators per voice, 256 segment amplitude envelope generator.
• 12-bit multitimbral, 16 channels, 144 parts.
• Fully assignable filters and envelopes.
• 2 Low-frequency oscillators (LFO's) per voice, 24 multi-form LFO's total, all adjustable, 12 different adjustable options (see Low-frequency oscillation).
• Variable sampling rate.
• 18-bit floating point resolution.
• Truncation, looping (see music loop), velocity crossfading.
• Two separate signal buses (see electrical bus).
• SCSI system architecture.
• Separate outputs on both balanced XLR and 1/4 inch high and low power signal outputs as well as a 1/4 inch headphone jack.
• Click track (built in metronome) for timing purposes, switchable on or off.
• Trigger in via 1/4 inch jack.
• Two full-size brass pedals built into the power pod, used for sustain, sound dampening and sostenuto just like an acoustic piano.
• Full size 88 note velocity-sensitive fully weighted keyboard using lead weights in the keys (excluding RMX models).
• Keyboards can be split, layered or set up with dual-amplitude 6 layers deep. 87 split keyboards in one keyboard setup is possible. Approximately 40 user-created keyboard setups can be programmed, depending upon the keyboard types that are programmed.
• MIDI capable IN, OUT and THRU with limitations on MIDI functionality (not MIDI GM standard - GM standard was implemented in 1991, one year after the Kurzweil K250 ceased to be manufactured).
• Kurzweil K1000 remote mode capable with message display and remote button operation.
• Main Unit Size = 54" width x 27" length x 9" height.
• Main Unit Weight = 95 pounds plus a few pounds for optional components.
• Power Pod Size = 11⅛" width x 17¾" length x 4⅛" height (283 x 451 x 105 mm).
• Power Pod Weight = 22 pounds (10 kg).
• Power input = 110-120 volts AC, 50/60 Hz, 380 watts (typical, an option was available for 220-240 volts AC). Later units had a different internal power supply and selectable 110/220 volts AC, 50/60 Hz, 380 watts.