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
Sorry but no, you have it backwards, Bruce. 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!!"
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