Dave Smith Instruments SYNTHESIZERS

Ok,I phoned my brother,and asked him for some extra info,he was so 
kind to send me a text-Here it is;

Recapitulated,... 
A signal source with a typical Line-Out (pc soundcard,...), and a 
device with an input (e.g. headphones, cassette recorder,...). 

Assuming you connect a signal source to the input of your tape 
recorder.. The ideal situation would be that, the cassette recorder 
drains an absolute minimum amount of current from your signal source. 
The higher the impedance of the input (e.g. cassette recorder, 
headphones,...), the less your signal source will be loaded, and the 
less your signal will collapse. 

So, to keep things short, we have "input impedance" and "output 
impedance". You should apply the following: the input impedance must 
be at least a factor 10 higher, this to maintain an acceptable signal 
transfer (voltage may not collapse, due to high current drainage). 

Three main groups of headphones exist, being broadcast, professional 
or portable. 
Broadcast: 1500 - 2000 Ohm. They're ideal to monitor a signal source 
without loading it unduly and causing a drop in the level. 
Prof: 150 - 600ohms. E.g. the Sennheiser HD250. Note that the lower 
the impedance, the louder they will sound. 
Port:: around 24ohms. Why? Because portable equipment uses batteries, 
and so disposes of less voltage to drive a signal. The solution is to 
let it "deliver" more current to produce an acceptable signal. 

SO: If you really want to monitor a signal, without loading the line 
unduly (signal loss!), then you shouldn't save a few euros on a 
suitable type of phones. Anyhow, don't load a signal source more than 
needed. 



CONCERNING Amps and Speakers: 
That's another topic. Impedance of speakers should be same as 
impedance of Amp. This to avoid "reflection". Most vintage valve amps 
will self-destruct if driven without the correct speaker load. 

I rest my case 



--- In DSI_Evolver@yahoogroups.com, Robert Krueger <rkr1@t...> wrote:
>
> colpaertpeter wrote:
> > Hello
> > 
> > Since I have the new manual now,there is no stopping in exploring 
the 
> > evolver.I'me sitting on the train for 1 hour (every day) and I 
want to 
> > use this time for digging into the evolver.Yes there are power 
supply's 
> > on the train  :-).Mostly I'me just playing with Reaktor on my 
laptop.
> > I want to connect a headphone on my evolver,I have a adaptor 
cable ,so 
> > I can put 2 jacks in the stereo outputs that go to one connection 
for a 
> > headphone.My brother tells me this will damage the evolver 
outputs.Does 
> > anybody knows about this?True or false,i don't know.
> > 
> 
> 
> I'd like to hear your brother's explanation as to why he thinks the 
> outputs will be damaged.  What does he think is happening exactly.
> There's no reason why you can't do this and there is nothing going 
on 
> that would hurt your evolver in anyway.... unless your jacks are 
square 
> or something :)
>