I have plugged both cheap sony walkman/ipod
headphones, expensive bang and olufson headphones and large AKG headphones into
my evolver using an adapter directly into the outputs of the Evolver. Everything
sounded good, my evolver and all headphones are fine. That's my
case.
But you can certainly find a battery powered
headphone amp and put that between if you want.
----- Original Message -----From: colpaertpeterSent: Thursday, October 27, 2005 6:27 AMSubject: [Evolver] Re: Connecting headphones-the comment of my brotherOk,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 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 :)
>