Yamaha DX Synths History: 1983-85

Contents

• Introduction
• Historical Context
  • From Analog to Digital
  • FM Synthesis and John Chowning
  • The DX7 Revolution (1983)
• FM Synthesis Explained
  • Operators and Algorithms
  • Envelopes and Dynamics
• The Core DX Models
  • DX7 (1983)
  • DX7II Series (1987)
  • DX1 (1983)
  • DX5 (1985)
• The 4-Operator DX Family (Mid-Range and Budget Models)
  • DX9 (1983)
  • DX21 / DX27 / DX11 (1985)
  • DX100 (1985)
• Rackmount and Professional Systems
  • TX7
  • TX816
• Sound Character and Musical Impact
  • Signature Sounds
  • Artists and Genres
• Strengths and Limitations
  • Strengths
  • Limitations
• Collectibility and Modern Use
• Legacy of the DX Series
• Yamaha DX Series Main Features Table
• Documentation
  • DX7
  • DX7II
  • DX1
  • DX9
  • DX5
  • DX11
  • DX21
  • DX27
  • DX100
  • TX7/TX816
• Specifications
  • DX7
  • DX7II
  • DX1
  • DX9
  • DX5
  • DX11
  • DX21
  • DX27
  • DX100
• Other Media

Introduction

The Yamaha DX series represents one of the most important turning points in synthesizer history.

Where earlier Yamaha lines such as the CS series explored the outer limits of analog subtractive synthesis, the DX range ushered in the age of digital FM (Frequency Modulation) synthesis. Beginning in the early 1980s, DX instruments reshaped the sound of popular music, studio production, and live performance for more than a decade.

Most famously embodied by the DX7, the series became synonymous with the clean, bright, expressive tones of the 1980s — electric pianos, bells, glassy pads, punchy basses, and metallic percussion. Yet beyond the presets that defined an era, the DX family represents a deep, technically ambitious synthesis platform whose influence continues today in both hardware and software.

Historical Context

From Analog to Digital

By the late 1970s, analog synthesizers were well established, but they were expensive, unstable, and increasingly limited by manufacturing costs. Yamaha, already a major force in electronic instruments, sought a new approach that would offer greater stability, polyphony, and expressive control.

FM Synthesis and John Chowning

The breakthrough came through Yamaha’s licensing of FM synthesis, developed by John Chowning at Stanford University.

Unlike subtractive synthesis, FM generates complex harmonic content by modulating one waveform with another. The result was a sound palette that could range from warm and musical to sharp, percussive, and otherworldly—all using relatively modest digital hardware.

The DX7 Revolution (1983)

When the DX7 launched in 1983, it was revolutionary:

• Fully digital synthesis
• 16-note polyphony
• Velocity sensitivity as standard
• Reliable tuning and compact design

It quickly became one of the best-selling synthesizers of all time, appearing on countless records across pop, rock, jazz, R&B, and film scores.

FM Synthesis Explained (DX Series Overview)

While FM synthesis can appear complex, the DX series follows a consistent internal logic.

Operators and Algorithms

• Operators are essentially sine-wave oscillators with their own envelopes.
• Operators can act as carriers (audible) or modulators (shaping harmonics).
• Algorithms define how operators are connected and modulate one another.

Most flagship DX models use 6 operators, while budget models typically use 4 operators.

Envelopes and Dynamics

DX envelopes are multi-stage and extremely precise, allowing for:

• Sharp, percussive attacks
• Evolving harmonic movement
• Expressive response to velocity and aftertouch

This precision is a major reason DX instruments excel at electric pianos, mallets, and basses.

The Core DX Models

DX7 (1983)

The definitive DX synthesizer.

• 6-operator FM engine
• 16-note polyphony
• Velocity sensitivity
• 32 onboard presets

The DX7’s sound defined an era. Its factory presets—particularly electric pianos and basses—became industry standards, sometimes to the point of overuse. Despite its famously challenging programming interface, the DX7 remains deeply respected for its expressive range and sonic clarity.

Model: DX7
Price: ¥248,000 / $1,070
Tone: Generator FM Synthesis
Keyboards: 61 keys
Polyphony: 16
Dimensions: 1,018 (W) x 329 (D) x 102 (H) mm
Weight: 14.2kg

DX7II Series (1987)

An evolution rather than a reinvention.

• Improved MIDI implementation
• Expanded patch memory
• Refined hardware and UI

Variants included:

• DX7IIFD – with built-in floppy disk drive
• DX7IIZ – enhanced output and performance features

These models addressed many practical limitations of the original DX7 while retaining full compatibility.

Model: DX7IIC
Price: ¥500,000 / $3,550
Tone Generator: FM Synthesis
Keyboards: 76 moonflight keys
Polyphony: 16
Dimensions: 1,206 (W) x 333.7 (D) x 85.8 (H) mm
Weight: 14.3kg

Model: DX7IID
Price: ¥258,000 / $1,550
Tone Generator: FM Synthesis
Keyboards: 61 keys
Polyphony: 16
Dimensions: 999 (W) x 333.7 (D) x 85.8 (H) mm
Weight: 10.5kg

Model: DX7IIFD
Price: ¥298,000 / $1,780
Tone Generator: FM Synthesis
Keyboards: 61 keys
Polyphony: 16
Dimensions: 999 (W) x 333.7 (D) x 85.8 (H) mm
Weight: 11.2kg

DX1 (1983)

Yamaha’s no-compromise flagship.

• Dual DX7 engines
• Weighted wooden keyboard
• Enhanced control interface

Produced in very limited numbers, the DX1 was extraordinarily expensive at launch and remains highly collectible. It stands as a statement piece rather than a mainstream instrument.

Model: DX1
Price: ¥1,950,000 / $8,400
Tone Generator: FM Synthesis
Keyboards: 73 keys
Polyphony: 32 (single), 16 (Dual), 16+16 (Split)
Dimensions: 1,255 (W) x 640 (D) x 225 (H) mm
Weight: 51kg

DX5 (1985)

A more attainable dual-engine flagship.

• Two independent 6-operator FM tone generators
• 16-note polyphony per engine (layer/split capable)
• Weighted keyboard with velocity and aftertouch

The DX5 effectively brought much of the DX1 concept to a wider audience at a lower cost. While it lacks the luxury construction and extensive panel controls of the DX1, it offers comparable sonic power through dual-layer FM operation. The DX5 is often overlooked but remains a formidable performance instrument, particularly for splits, layered textures, and complex evolving sounds.

Model: DX5
Price: ¥598,000 / $2,500
Tone Generator: FM Synthesis
Keyboards: 76 keys
Polyphony: 32
Dimensions: 1,229 (W) x 441 (D) x 113 (H) mm
Weight: 19kg

The 4-Operator DX Family (Mid-Range and Budget Models)

To broaden the appeal of FM synthesis, Yamaha released a range of more affordable DX instruments using simplified 4-operator engines.

DX9 (1983)

• Reduced FM engine
• Limited programmability
• Marketed as an entry-level DX

Model: DX9
Price: ¥188,000 / $810
Tone Generator: FM Synthesis
Keyboards: 61 keys
Polyphony: 16
Dimensions: 1,018 (W) x 329 (D) x 102 (H) mm
Weight: 12kg

DX21 / DX27 / DX11 (1985)

• Improved 4-operator architecture
• More patch storage
• Compact and affordable designs

Model: DX21
Price: ¥133,000 / $560
Tone Generator: FM Synthesis
Keyboards: 61 keys
Polyphony: 8
Dimensions: 909 (W) x 270 (D) x 82 (H) mm
Weight: 8kg

Model: DX27
Price: ¥98,000 / $410
Tone Generator: FM Synthesis
Keyboards: 61 keys
Polyphony: 8
Dimensions: 909 (W) x 270 (D) x 82 (H) mm
Weight: 7.5kg

Model: DX11
Price: ¥145,000 / $999
Tone Generator: FM Synthesis
Keyboards: 61 keys
Polyphony: 8
Dimensions: 901 (W) x 297.7 (D) x 63.3 (H) mm
Weight: 7.0kg

Model: DX27S
Price: ¥118,000 / $700
Tone Generator: FM Synthesis
Keyboards: 61 keys
Polyphony: 8
Dimensions: 1,091 (W) x 270 (D) x 82 (H) mm
Weight: 10.5kg

The DX27S was a cut down version of the DX27, and was intended for educational settings. It stripped out a number of features while retaining the sound quality, and hence was a cheaper introductory instrument for school use.

Additionally, the SDX27S was the same instrument as the DX27S but bundled with accessories such as a stand.

DX100 (1985)

• Mini keyboard
• Battery-powered portability
• Famously used for bass sounds

While less flexible than 6-operator models, these synths still deliver unmistakable FM character and remain popular today.

Model: DX100
Price: ¥69,800 / $290
Tone Generator: FM Synthesis
Keyboards: 49 mini keys
Polyphony: 8
Dimensions: 628 (W) x 219 (D) x 75 (H) mm
Weight: 2.7kg

Rackmount and Professional Systems

TX7

• Rackmount DX7 engine
• No keyboard
• Fully MIDI-controlled

TX816

• Eight DX7 modules in a single rack
• Massive polyphony and layering potential
• Used extensively in professional studios

These systems highlight how deeply FM synthesis integrated into 1980s studio workflows.

Model: TX7
Price: ¥145,000 / $610
Tone Generator: FM Synthesis
Polyphony: 16
Dimensions: 351 (W) x 241 (D) x 50.2 (H) mm
Weight: 2.3g

Model: TX816
Price: ¥890,000 / $3,750
Tone Generator: FM Synthesis
Rack Mount Size: 4U
Polyphony: 16 x 8
Dimensions: 480 (W) x 346 (D) x 176 (H) mm
Weight: 12kg

Sound Character and Musical Impact

Signature Sounds

• Electric pianos
• Bells and chimes
• Digital brass
• Tight basses
• Metallic percussion

Artists and Genres

DX synths appeared everywhere—from pop ballads to jazz fusion, from film scores to early electronic music. Their clarity and consistency made them ideal studio tools during the rise of MIDI-based production.

Strengths and Limitations

Strengths

• Extremely expressive
• Stable tuning
• Wide tonal range
• Iconic sound palette

Limitations

• Steep learning curve
• Menu-driven programming
• Preset overuse historically overshadowed depth

Collectibility and Modern Use

Vintage DX instruments are now valued both as historical artifacts and as practical sound sources. Common maintenance considerations include:

• Internal memory batteries
• Button and membrane wear
• Aging displays

Modern alternatives such as software FM synthesizers and compact hardware reissues have renewed interest in FM synthesis, often drawing directly from DX architecture.

Legacy of the DX Series

The Yamaha DX series permanently changed how synthesizers were designed, played, and produced. It marked the transition from analog dominance to digital experimentation and left a sonic fingerprint that still resonates decades later.

Just as the CS series represents Yamaha’s analog ambition, the DX line stands as its digital revolution—bold, complex, and unmistakably influential.

Yamaha DX Series Main Features Table

Documentation

Here is a selection of official literature produced by Yamaha when various DX and TX models were launched.

DX7

DX7II

DX1

DX9

DX5

DX11

DX21

DX27

DX100

TX7/TX816

Specifications

More detailed specifications for the Yamaha DX models. We have used the most original sources available, including scans of manufacturer documents, checking for sense and completeness. Manufacturer error and semi-automated translation to text may introduce discrepancies.

DX7

• Keyboard: 61 keys (Cr-Cd), with Initial/After touch
• Tone Generator: FM tone Generator (6 operators 32 algorithms)
• Simultaneous Note Output (Reverse priority): 1-voice: 16 notes
• Internal Memory: 64-voices/32 performances, 2 micro tunings, system set-up
• External ROM Memory: 128 voices/64 performances, micro tunings, fractional level scaling
• External Memory: RAM cartridge (Optional, RAM4)
• Control Sliders and switches: Volume slider, Continuous sliders CS1, CS2 (Data entry), Data entry switch x 2, Mode setting switch x 10, Voice switch x 32
• Controls: PITCH BEND WHEEL, MODULATION WHEEL
• External Control Terminals: BREATH CONTROL, SUSTAIN, FOOT SWITCH (Sustain, Portamento, key hold, Soft), FOOT CONTROL 1 (Volume, Modulation, Voice parameter), FOOT CONTROL 2 (Volume, Modulation), RAM / ROM CARTRIDGE SLOT, MIDI IN-OUT-THRU
• Output Terminals: Output, Headpbones
• Display: LCD: 16 letters x 2 lines (illuminated) LED: 7 segments x 2 digital
• Dimensions (W × H xD): 999 x 85.8 x 333.7 mm (39-3/8″ x 3-3/8″ x 13-1/8°)
• Weight: 10.5 kg (23.1 lbs)
• Standard Accessorles: Music holder, ROM cartridge
• Optional Accessories: RAM Cartridge, Flight Case, Hard Case, Soft Case, Cartridge Adaptor, Foot Switch FC4/FC5, Foot Controller FC7, Breath Controller BC1, BC2, Stand LG-100, MIDI cables

DX7II

• Keyboard: 61 keys, with Initial/After touch
• Tone Generator: FM tone Generator (6 operators 32 algorithms)
• Simultaneous Note Output (Reverse priority): 1-voice: 16 notes (single play), 2-voice: 8 notes (dual play), 2-voice: 16 notes (split play)
• Internal Memory: 64-voices/32 performances, 2 micro tunings, 1 system set-up
• External ROM Memory: 128 voices/64 performances, micro tunings, fractional level scaling
• External Memory: RAM cartridge (Optional, RAM4), Micro floppy disk (optional, MF2DD) Internal memory x40, MIDI exclusive data
• Control Sliders and switches: Volume slider, Continuous sliders CS1, CS2 (Data entry), Data entry switch x 2, Mode setting switch x 12, Voice switch x 32
• Controls: PITCH BEND WHEEL, MODULATION WHEEL
• External Control Terminals: BREATH CONTROL, SUSTAIN, FOOT SWITCH (Sustain, Portamento, key hold, Soft), FOOT CONTROL 1 (Volume, Modulation, Voice parameter), FOOT CONTROL 2 (Volume, Modulation), RAM / ROM CARTRIDGE SLOT, MIDI IN-OUT-THRU
• Output Terminals: Output A/MIX B, Headpbones
• Disk Drive (DX711FD only): 3.5″ Micro Floppy Disk, built in, 2DD 1M (720K bytes when formatted)
• Display: LCD: 40 letters x 2 lines (illuminated) LED: 7 segments x 2 digital x2
• Dimensions (W × H xD): 999 x 85.8 x 333.7 mm (39-3/8″ x 3-3/8″ x 13-1/8°)
• Weight: DX7IID: 10.5 kg (23.1 lbs) DX711FD: 11.2kg (24.7 lbs)
• Standard Accessorles: Music holder, ROM cartridge
• Optional Accessories: RAM Cartridge, Flight Case, Hard Case, Soft Case, Cartridge Adaptor, Foot Switch FC4/FC5, Foot Controller FC7, Breath Controller BC1, BC2, Stand LG-100, MIDI cables, micro floppy disk

DX1

• 73 keys (E0-E6)
• Initial & After Touch Response
• 2 sets of FM Digital Tone Generators
• 6 Operators, 32 Algorithms
• Key Assign Modes: Single (32 notes)/Dual (16 notes)/ Split (16 + 16 notes)
• Internal Voice Memory: 64 (A32 + B32)
• Internal Performance Memory: 64
• External Voice Memory: 128 (ROM x 2)/64 (RAM x 2)
• External Performance Memory: 64 (ROM, RAM)
• 145 Voice Parameters, 33 Performance Parameters
• Control Terminals: Sustain, Portamento, Volume, Modulation, Breath Control, MIDI
• Display: LED (voice parameters for 1 operator), LCD (40 characters x 2)
• Standard Accessories: ROM Cartridge x 5 (64 voices x 4, 64 performances x 1), FC-3A foot Controller x 2, FC-4 Foot Switch x 2, BC1 Breath Controller
• Options: RAM-1 Data Cartridge, LG-200 Stand

DX9

• Keyboard: 61 keys
• Sound Source: FM Tone Generator, 4 operators, 8 algorithms
• Simultaneous Output Notes: POLY mode: 16, MONO mode: 1
• Internal RAM: 20 Bank (20 Memory)
• Mode Selectors: STORE, EDIT/COMPARE, PLAY-MEMORY SELECT, FUNCTION
• Controls: VOLUME, DATA ENTRY [lever, switch: YES (ON)/NO (OFF)], PITCH WHEEL, MODULATION WHEEL, OPERATOR ON-OFF, EG COPY, OPERATER SELECT
• Voice Parameters: ALGORITHM, FEED BACK, LFO (WAVE, SPEED, DELAY, PMD, AMD), MOD SENSITIVITY (PITCH, AMPLITUDE), OSCILLATOR (FREQUENCY COARSE, FREQUENCY FINE, DETUNE/SYNC), EG (RATE, LEVEL), KEYBOARD SCALING (RATE, LEVEL), OPERATOR OUTPUT LEVEL, KEY TRANSPOSE
• Function Parameters: MASTER TUNE ADJ, POLY/MONO, PITCH BEND (RANGE), PORTAMENTO (MODE, TIME), CASSETTE (SAVE/VERIFY, LOAD, LOAD SINGLE, REMOTE), MODULATION WHEEL (RANGE, PITCH, AMPLITUDE, EG BIAS), BREATH CONTROL (RANGE, PITCH, AMPLITUDE, EG BIAS), EDIT RECALL, VOICE INIT, BATTERY CHECK, MEMORY PROTECT
• Connecting Terminal: OUTPUT, PHONES
• Control Terminal: FOOT SWITCH (SUSTAIN, PORTAMENTO), FOOT CONTROL (VOLUME), BREATH CONTROL, MIDI (IN, OUT, THRU), CASSETTE INTERFACE (IN, OUT, REMOTE)
• Others: LCD Display
• Dimensions/Weight: 101.8(W)x 10.2(H) x 32.9(D) cm (40″x4″x13″)/12.4 kg (27.4 lbs.)
• Power Consumption: 35W
• Accessories: Music Stand, Voice Data Cassette Tape (120 voices), Cassette Interface Cable

DX5

• Keyboard: 76 keys E0-G6 with velocity and aftertouch
• Sound Source: FM, 6 operators x2, 32 algorithms
• Simultaneous Note Output: POLY: 32 notes (Single) 16 notes (dual), 16+16 notes (split), MONO: 1 note (single, dual) 1+1 note (split)
• Internal Voice Memory: 64
• External Voice Memory: 64
• Controls: Volume, Balance, Phones Volume, Portamento Time, Pitch Wheel, Modulation Wheel, Data Entry
• Voice Parameters: ALGORITHM, FEEDBACK, OCILLATOR (MODE DETUNE, COARSE, FINE, KEY SYNCI, EG (RATE. LEVEL), PITCH EG (RATE, LEVEL) KEYBOARD LEVEL SCALING (BREAK POINT, CURVE, DEPTH). KEYBOARD RATE SCALING, KEY VELOCIM SENSITIVITY, AMPLITUDE MODULATION SEN-SITIVITY, OPERATOR OUTPUT LEVEL LFO (WAVE, SPEED, DELAY, PMO, PMS, AMD, KEY SYNC TRANSPOSE, VOICE NAME.
• Function Parameters: MASTER TUNE, DUAL MODE DETUNE, POLY/MONO, SOURCE SELECT, PITCH BEND RANGE, PITCH BEND STEP, PORTAMENTO/GLISSANDO, PORTAMENTO MODE, PORTAMENTO TIME., SUSTAIN PEDAL ASSIGN, PORTAMENTO PEDAL ASSIGN, OUTPUT LEVEL ATTENUATE, PROG OUT ASSIGN, MOO. WHEEL SENSITIVITY, MOD. WHEEL ASSIGN, FOOT CONT. SENSITIVITY, FOOT CONT. ASSIGN, BREATH CONT. SENSITIVITY, BREATH CONT. ASSIGN, AFTER TOUCH SENSITIVITY, AFTER TOUCH ASSIGN, SPLIT POINT, KEY SHIFT, PERFORMANCE NAME, COPY OF DATA, SAVE TEMP OPERATOR, INTALZE MEMORY, RECALL EDIT BUFF, SAVE TO CARTRIDGE, LOAD FROM CARTRIDGE. CHANGE CART FORMAT, PROTECT MEMORY WRITE, CLEAR ALL MEMORY. CHECK BATTERY, MIDI ON/OFF, REMOTE SEQ, SET STATUS, TRANSMIT DATA
• Display: (40 characters x 2)
• Connecting Terminals: OUTPUT x2, PHONES
• Control Terminals: FOOT SWITCH (SUSTAIN, PORTAMENTO, FOOT CONTROL (MODULATION, VOLUME), MIDI (IN, OUT, THRU)
• Power Consumption: 35 W
• Dimensions/Weight: 1229(W)x 113(H)x 441(D) mm (48.4″x4.4″ X 17.4″) / 18 kg (39.7 lbs)

DX11

• Keyboard: 61 keys with velocity and after touch
• Sound Source: 4 operator, 8 algorithm 8-wave FM tone generation, 8 voice polyphonic output
• Internal Memory: 128 ROM voice, 32 RAM voice, 32 RAM performance
• Controls: Pitch bend, modulation wheel, master volume, data entry
• Terminals: Audio Output, phones, volume, foot control, footswitch, cassette, MIDI In/Out/Thru, breath control, data cartridge
• Display: 16×2 backlit LCD
• Power consumption: 10w
• Weight: 7kg (15lb 7oz)
• Dimensions (WxHxD): 901x633x297.7mm (35-1/2″x2-1/2″x11-3/4″)

DX21

• Keyboard: 61 keys
• Sound Source: 4 operator x2, 8 algorithm FM tone generation
• Polyphony: 8 notes (single), 4 notes (dual), 4+4 notes (split), monophonic 1 note (single/dual) 1+1 note (split)
• Internal Memory: 128 ROM voice, 32 RAM voice, 32 RAM performance
• Controls: Pitch bend, modulation wheel, master volume, balance, data entry
• Terminals: Audio Output x2, phones, volume, foot control, footswitch, cassette, MIDI In/Out/Thru
• Display: 16×2 backlit LCD
• Power consumption: 7w
• Weight: 8kg (17lb 6oz)
• Dimensions (WxHxD): 909x82x270mm (35.8″x3.2″x10.6″)

DX27

• Keyboard: 61 keys
• Sound Source: 4 operator, 8 algorithm FM tone generation
• Polyphony: 8 notes
• Internal Memory: 24 voice internal, 192 voice preset, 96 voice number bank
• Effects: Pitch bend, modulation, portamento, sustain, key velocity
• Controls: Pitch bend, modulation wheel, volume
• External terminals: breath control, foot switch
• Connecting Terminals: Audio Output, phones, sustain, footswitch, cassette, MIDI In/Out/Thru, breath control
• Display: 16×2 backlit LCD
• Weight: 7.5kg (16.5lbs)
• Dimensions (WxHxD): 909x82x270mm (35.8″x3.2″x10.6″)

DX100

• Keyboard: 61 keys
• Sound Source: 4 operator, 8 algorithm FM tone generation
• Polyphony: 8 notes
• Internal Memory: 24 voice internal, 192 voice preset, 96 voice number bank
• Effects: Pitch bend, modulation, portamento, sustain, key velocity
• Controls: Pitch bend, modulation wheel, volume
• External terminals: breath control, foot switch
• Connecting Terminals: Audio Output, phones, sustain, footswitch, cassette, MIDI In/Out/Thru, breath control
• Display: 16×2 backlit LCD
• Weight: 7.5kg (16.5lbs)
• Dimensions (WxHxD): 909x82x270mm (35.8″x3.2″x10.6″)

Other Media

DX7

Francis Monkman demonstrates the Yamaha DX7: