The main problem is in this case not the impedance but the audio level.
Output levels of electric guitars, basses or microphones are in the mV range
(i.e. 1/1000 V) and the impedance is in the MOhm range. The levels of the
A-100 are in the Volt range and the A-100 modules have low impedance outputs
(typ 10k or even less, that's only 1/100 of the MOhm you mentioned). I don't
think that a DI box is necessary.

Best wishes
Dieter Doepfer

> -----Ursprüngliche Nachricht-----
> Von: Doepfer_a100@yahoogroups.com
> [mailto: Doepfer_a100@yahoogroups.com ]Im Auftrag von bouyakaboy
> Gesendet: Freitag, 7. Juli 2006 13:57
> An: Doepfer_a100@yahoogroups.com
> Betreff: 1 Re: output impedance of a patch and DI
>
>
> The problem is not the cable length but the impedance matching !
> Have you ever try to plug a bass or a guitar directly into a "line in"
> soundcard or a mixing console The song is awful because the output
> impedance of these intruments is very hight (Mega Ohm) ! Even with a 2
> or 3 meter cable length ! And it drops lot of frequencys :-(
> But with a DI witch low down the impedance the sound become cleaner
> and beautiful.
>
> So, the output impedance of a A-100 VCA or mixer seem's to be 10Kohm,
> and it's pretty hight. I Think so that low down it with a DI can
> improve the sound quality of a A-100 patch. That is the question !
>
> Best regards
> Julien.
>
>
> --- In Doepfer_a100@yahoogroups.com , Florian Anwander
> <Florian.Anwander@...> wrote:
> >
> > Hi
> >
> > > Nobody try to record is A-100 with a sound card and use DI
> > Nobody answered, because nobody had the idea to do so. ;-)
> >
> > A DI-Box is not necessary (but of course not wrong) for line outs of
> > usual synths as long as the connection between the synth and the input
> > of the mixing desk or the soundcard is short enough (not longer than 2
> > or 3 meters), and if the input is a line input too.
> >
> > You only should use a DI-Box if the cable length is longer, and the
> > input is a balanced (Mic-)input.
> >
> > Florian
> >
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