Kurzweil K2500R (1995)

Name: Kurzweil K2500R
Brand: Kurzweil

A 3U rackmount digital sound module and sampler using V.A.S.T. synthesis, released in 1995 as the rack version of the K2500.

Overview

The Kurzweil K2500R is a rackmount digital sound module and sampler, released in 1995 as the 3U rack-mountable counterpart to the K2500 keyboard. It is an evolution of the K2000 series and runs on Kurzweil's V.A.S.T. (Variable Architecture Synthesis Technology). It was built for professional studio and stage use, and it packs a lot into the box. It supports 48-voice polyphony (or 24 stereo voices), has eight drum channels, and carries 8 MB of internal ROM sounds. The floppy drive reads both Ensoniq and Akai disks, which helps with moving samples between platforms.

Specifications

Polyphony	48 voices (or 24 stereo)
Oscillators	192
Synthesis	V.A.S.T. Variable Architecture Synthesis
ROM sounds	8 MB Internal ROM
Drum channels	8
Form factor	3U rackmount
Dimensions	54.3″ x 17.8″ x 4.8″
Floppy disk compatibility	Ensoniq and Akai formats

Design

The K2500R uses a modified version of the K2000R power supply. The updates include jumpers for increased current flow and an upgraded 78T12 regulator that can handle an additional half-amp. The silk screen on the power supply board still reads "k2000R," so the hardware design is shared. Service documentation exists, but the available manuals don't include full schematics for the K2500R-specific boards. They do reference troubleshooting guides and engineering bulletins.

Context

The K2500R is the rackmount version of the K2500, which itself is an evolution of the K2000 series. It was positioned as a "bigger and better" successor to the K2000R, with expanded synthesis power and sampling flexibility but no revolutionary changes. It shipped shortly after the keyboard version.

Market

Listed prices for the K2500R vary. Examples include €350 plus shipping (Gearspace, 2020) and a reported original price of €50, which is likely incorrect or refers to a component. One known operational issue is failure to boot past the "Please wait..." screen, potentially due to power supply instability or CPU faults. No widespread reports of common failures or spare parts availability are documented.