> Sorry but no, you have it backwards, Bruce.
Lab equipment... man I want an analyzer to solve this with! A Google search
for "headphone output impedance" got back a range of 30 to over 600 ohms.
Ed Edwards
Leader: Ezekiel's Wheel »»»»Retro-Progressive Rock««««
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----- Original Message -----
From: "Mike Metlay" <metlay@...>
To: <AN1x-list@yahoogroups.com>
Sent: Thursday, August 14, 2003 3:24 PM
Subject: [AN1x] Impedance and volume
>
> Bruce Wahler said:
> > Hi Shakti,
> >
> >>Thanks for the reply Jimmy!
> >>
> >>> Are all the patches quiet or just some?
> >>
> >>All patches are low in volume.
> >>
> >>What are you using for an amp?
> >>
> >>I have been using headphones ( a couple different types)
> >
> > It could be a combination of the AN1x and the headphones you are using.
I use
> > a pair of Sennheiser HD580's, and while the volume is adequate, it's not
> > overly loud. I was prepared for this: All of the reviews said that the
> > Sennheisers really need a strong amp to drive them, because of their
high
> > impedance.
> >
> > Years ago, most headphones were 8 ohms, and all headphone outputs on
stereos,
> > etc. were set up to handle this load. These days, headphone impedances
are
> > all over the place, from around 30 ohm to tens of thousands of ohms.
> >
> > Regards,
> >
> > -BW
>
Years ago, most speakers were 8
> ohms, and headphones were designed to be driven by the same amp circuit
that
> fed the speakers without anything getting overloaded (the speakers, the
> headphones, or most importantly the amp itself, usually tube-driven in
those
> days). To do this they had to have a very high impedance, 600 to 2000
ohms, so
> they could be strapped across the amplifier with the speakers without
> affecting the amp load much.
>
> When portable cassette players came out and required lower-impedance
> headphones to get decent level from their tiny battery-powered amps (and
> didn't hook up to speakers anyway), that's when impedances started to
drop.
>
> Many good headphones today still use a 600 ohm impedance, but others are
> specifically being designed with lower impedances. As an example, AKG
still
> makes the excellent K240 M headphone, a 600 ohm phone that's often used
for
> orchestral sessions where many headphones can be chained in parallel
without
> the net impedance dropping too low (you can chain 75 sets and still have
an
> 8-ohm load). But AKG also recently released the K240 Studio, a redesigned
> headphone with a 55 ohm impedance.
>
> mike
>
> --
> "Run for your lives! Lofty's figured out he's BIGGER than all of us!!"
> > < > < > < > < > < > < > < > < > < > < > < > < > < > < > < > < > < > <
> metlay / atomic city / metlay@... / http://www.atomiccity.com
>
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