Oberheim Matrix synthesizers were a product line of subtractive analog synthesizers from Oberheim featuring a system of modulation which Oberheim called "Matrix Modulation" as a method of selecting and routing elements that dynamically shape various aspects of the sounds it produces. Matrix synthesizers continue to be popular due to their characteristic late-1980s analog sound and leading patching and filter capabilities.

These five products fall into two groups. The Xpander is a six-voice rack-mount synthesizer with voltage-controlled oscillators and very flexible voltage-controlled filters. The Matrix-12 is in effect two Xpander's plus a keyboard. The second group consists of the Matrix-6 synthesizer, with DCOs, and much more standard filter capability. It had two rack-mount variants, the Matrix-6R and Matrix-1000.

Models

	Xpander[1]	Matrix-12[2]	Matrix-6[3]	Matrix-6R[4]	Matrix-1000[5][6][7]
Image(s)
Polyphony	6 voices	12 voices	6 voices
Oscillators	12 VCOs (2 per voice) featuring CEM3374	24 VCOs (2 per voice) featuring CEM3374	12 DCOs (2 per voice) featuring CEM3396
Filter	15 variations of low / high / band / notch based on CEM 3372 w/ external switch circuitry		1 low-pass resonant filter using CEM3396 built-in LPF
LFO	5		2 (plus 1 for vibrato effect)
Layers	6-part multitimbral with up to 6 zones	12-part multitimbral with up to 6 zones	2-part multitimbral with up to 2 zones		monotimbral
Memory	100 patches, 100 multi		100 patches, 50 multi		1000 patches (800 preset, 200 user)
Form Factor	Desktop	61-key (velocity & channel aftertouch)		Rackmount
Production	1984–1988	1985–1988	1985–1988	1986–1988	1988–1994
Price	US$3995	US$6399	US$1695	US$999	US$599