Re: 48 v phantom power to 9 v circuit

Pooh Bear wrote:

> hank alrich wrote:

> > Pooh Bear wrote:

> > > Can you suggest an example where 10M input Z is required ?

> > For whatever reasons, the very best DI's I have used have an input
> > impedance in that range.

> Sounds to me like overkill.

> I can't actually imagine where anything over 1M would be needed.

Imagine what you will. When the sound meets my ear I tell you what I
think of it. I have direct experience with a few of these boxes. I
report what I hear, as a recordist, an SR mixer, and as a player of a
few different string instruments. I can hook up a passive Jensen DI with
about 200K input impedance, a GR MP2-MH with about 500K, an Alembic F2B
with a megohm, and the GTQ2 and Evil Twin with 10 Megohms. All of those
work reasonably well with electromagnetic sources. The last two allow
piezos other than the K&K Pure Western system I have in one instrument
to sound tolerable. The K&K does something different inside it and
sounds quite good with a range of devices, but usually having at least
the one megohm you suggest.

Piezos want really high input impedances. I've read more than once
somebody's technical treatise about why one megohm should be sufficient.
I'll believe that when I hear it, and not before.

--
ha
.