Böhm Dynamic 4x9 Vintage FM Synth with Analogue Phaser + Ensemble

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RS051.1 Dr Böhm Dynamic 4x9 'No Talking Edition' video upload by rejected synths

"This is a shorter 'No Talking' edit of my video about the Dr Böhm Dynamic 4x9 for those who prefer 'pure' demos without comments. If you like it, go watch the full video, it features additional information about the machine:"

You can find additional demos and a brochure of the 12/24 model in previous posts here.

RS051 Dr Böhm Dynamic 4x9: FM Tank

video upload by rejected synths

Dopfer gets a mention at 2:17.

"Japanese manufacturers today are the big players in the synth world and they have been so for quite a while. But just like there are today, there have always been other choices too. Small manufacturers from many different countries add their own distinctive ‚flavors‘ and always have.

Take for example today‘s synth, the Dr Böhm Dynamic 4x9. It‘s a very German fully programmable 4OP FM-Synth monster. Big and heavy (and some might say over-engineered) like a German sedan. Stuffed to the brim with the latest technology (from the mid 80s) it clearly exceeds the capabilities of most of it’s contemporary peers. Featuring a whooping 36 voices (and 36 part multitimbrality), it is equipped with dual midi ports, lots of outputs, two analog effects boards and abundance of memory for patches and takes up a LOT of parking, ehm, rack space.

The biggest difference of course is, that you don’t have to built you Mercedes or BMW yourself, (and didn’t have to back in the 80s). A Doctor Böhm however was a DIY affair, to own one, you had to built one yourself. It’s no surprise then, that the 4x9 never became too popular or even widely known outside of it’s native country. So it’s actually much less a Beamer and more like a Bitter SC Sedan… or a German tank, if you go by its impressive weight or the thickness of the metal used for the casing ;)"

via this auction

Pic of the inside below.

"This one‘s a real hidden gem.

Developed in 1987 by the german organ factory Böhm (formerly known as Dr. Böhm) the Dynamic 4x9 is a 9 voice multitimbral 4 Operator FM Synthesizer with Bucket Brigade Effects Phaser and Ensemble. And it‘s got Yamaha (YM2203) ICs.

4x9 means you can route 4 Midi Channels, each with 9 Voices, separately. You got a stereo out and you got four single outs to mix each of the four channels separately.

Dynamic means you got aftertouch and velocity.

The attached video shows all functions and what the 4x9 sounds like.

Device works flawless, some scratches on top, no leaked battery. Looks fine inside.

220 Volt.

For 110 Volts you need a voltage converter"