Akai S1100EX

At 16 voices and 8 individual outputs, it’s the silent partner that turns a studio workhorse into a multitimbral powerhouse

Overview

The Akai S1100EX isn’t a sampler on its own—it’s the quiet upgrade that answers the one complaint owners of the S1100 couldn’t shake: not enough voices. Designed exclusively to expand the capabilities of the Akai S1100, the S1100EX adds 16 simultaneous voices and 8 individual audio outputs, effectively doubling the polyphony when used in Voice Expansion mode. It doesn’t have its own front-panel controls or sampling inputs, which keeps the design lean and focused. Instead, it piggybacks on the host S1100’s interface, relying on MIDI for note data and SCSI for sample and edit transfers. This isn’t a standalone unit; it’s a purpose-built extension, engineered to slot seamlessly into an existing rig where track counts were pushing limits and multitimbral arrangements demanded more headroom.

Owners report two distinct ways to use it. In Mode 1, the S1100EX acts as a fully independent S1100, sharing storage via floppy or hard disk while borrowing the host’s display for navigation. This turns one sampler into two separate instruments, ideal for layering complex arrangements without voice stealing. Mode 2 is where it truly shines—Voice Expansion mode—where the S1100EX and host combine to deliver 32 voices total, or 16 voices in full stereo. According to documentation, when loading samples in this mode, the S1100EX loads first, then the host follows, ensuring synchronized playback. The unit includes an internal FX card identical to the one in the S1100, so effects processing isn’t sacrificed in expansion.

It connects via MIDI and SCSI, and up to six S1100EX units can be chained together on a single SCSI bus, theoretically allowing for massive voice counts—though such setups were rare in practice. The rear panel includes a pair of audio inputs, not for sampling, but for cascading audio: routing the stereo outputs of the S1100 into the S1100EX lets sound pass through both units, useful for processing or output routing. A headphone socket is also mounted on the back, which some find awkward but others accept as a trade-off for rack efficiency. It requires the host S1100 to be updated to version 2.00 firmware, which involved both software and hardware changes, including new EPROMs—some benefits were available through software alone, but full functionality required the full upgrade.

Specifications

Key Features

16-Voice Polyphony Expansion

The core function of the S1100EX is straightforward: it adds 16 voices to the host S1100. In a sampler where stereo sampling cuts available voices in half, or where long decays and sustain pedals eat up note count, this expansion is more than luxury—it’s necessity. In Mode 2, the combined system delivers 32 voices, restoring headroom for dense arrangements. Reviewers noted that moving from a 32-voice Emu Proteus to the base 16-voice S1100 “came as a bit of a shock,” making the S1100EX a logical upgrade path. It doesn’t just add voices—it restores competitive parity.

Mode 1: Multitimbral Mode

In this configuration, the S1100EX operates as a separate instrument, sharing storage but not voice pool. It can run its own programs and respond to different MIDI channels independently, with data synchronized via SCSI and floppy disk. The host S1100’s display is used to navigate the EX unit’s functions, eliminating the need for duplicate controls. This mode appeals to users who need more multitimbral parts rather than just more voices—ideal for layering drum kits, bass, and pads across multiple outputs without voice stealing.

Mode 2: Voice Expansion Mode

This is the mode most owners use. The S1100EX and host merge into a single, more powerful sampler. When samples are loaded from disk, the S1100EX loads first, then the host follows, ensuring both units have identical data. The host remains the master controller, and all MIDI sequencing routes through it. In this mode, polyphony jumps to 32 voices, or 16 in stereo—effectively doubling the system’s capacity. It’s not just additive; it’s transformative, turning the S1100 from a capable sampler into a studio centerpiece.

8 Individual Outputs + Stereo Output

The S1100EX provides 8 individual outputs for multitimbral routing, plus a dedicated stereo output. This allows engineers to send different sounds to separate channels on a mixing console, maintaining clarity in complex productions. Combined with the host S1100’s outputs, this creates a highly flexible routing setup. The stereo output can be used for monitoring or cascading audio through additional units, enhancing signal flow options in a studio environment.

Audio Cascading via Rear Panel Inputs

The S1100EX includes a pair of audio inputs on the rear panel, not for sampling, but for routing audio from another unit—typically the host S1100. By connecting the stereo outputs of the S1100 to these inputs, users can pass audio through the S1100EX, allowing it to process or re-route signals. This feature enables creative signal chains, such as applying effects or balancing levels across multiple units. It’s a subtle but powerful feature for integrating the EX into a larger analog or digital setup.

Internal FX Card (Same as S1100)

Unlike some expanders that strip features to cut cost, the S1100EX includes the same internal FX card as the host S1100. This means it retains access to reverb, chorus/flange, stereo pitch shifting, and echo/DDL effects. When operating in Mode 1, the EX unit can run its own effects independently. In Mode 2, effects processing remains available without taxing the host’s resources. This inclusion was noted by reviewers as a significant advantage over simply adding a second S1100, which would require its own FX card upgrade.

SCSI and MIDI Integration

Communication between the S1100 and S1100EX happens over both MIDI and SCSI. MIDI carries note and control data, while SCSI handles sample transfers, system edits, and firmware updates. The SCSI chain supports up to six S1100EX units, theoretically allowing for 96 additional voices. In practice, most users run one or two units due to storage and power constraints. The reliance on SCSI means a compatible hard disk is required—not just for sampling, but for reliable operation. Reviewers noted that Akai’s optical drives worked well with the system, and disks could be partitioned for both sample storage and audio recording.

Firmware Requirement: S1100 Host v2.00

To use the S1100EX, the host S1100 must be updated to version 2.00 firmware. This update involved both software and hardware changes—some benefits were available through software alone, but full functionality required new EPROM chips. Later firmware, such as version 3.6, improved stability and added minor features. The upgrade was not trivial, requiring technical confidence or professional servicing, which may have limited adoption among casual users.

Historical Context

The S1100EX emerged as part of Akai’s S1000 series, a line that began with the S1000 in 1988 and set the standard for professional digital samplers. The S1100, released in 1990, built on that foundation with 20-bit DACs, onboard effects, and improved dynamic range. The S1100EX was Akai’s answer to increasing demands for more voices and greater multitimbral flexibility in studio and live settings. It allowed existing S1100 owners to scale their systems without replacing their entire setup. The S1000 series was eventually succeeded by the S3000 series in 1993, but the S1100 and its EX module remained in use throughout the 1990s, particularly in dance and hip-hop production, where layered, sample-heavy tracks demanded robust voice management.

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