[C[_2_]]

So I've learned some lessons recently about the importance of true 48v
power with the correct amount of millamps,etc. One of my Ph.power
supplies actually provides 50v. Is over powering bad for a mic? Will
it overwork it?

C

[LAB]

Standard Phantom Power is 48+/-4V, then 50V is Ok.

Gianluca

[Anahata]

C wrote:
So I've learned some lessons recently about the importance of true 48v
power with the correct amount of millamps,etc. One of my Ph.power
supplies actually provides 50v. Is over powering bad for a mic? Will
it overwork it?

Typical mics specify a tolerance of +/- 4V.

Also try drawing a 2 mA load from the supply (about 39k to ground on
each leg) and see what the voltage measures then. (at the 48V supply end
of the 6.8k resistors, not on pins 2 and 3 of the XLR)

Anahata

[Don Pearce]

On Tue, 25 Mar 2008 07:29:50 -0700 (PDT), C
wrote:

So I've learned some lessons recently about the importance of true 48v
power with the correct amount of millamps,etc. One of my Ph.power
supplies actually provides 50v. Is over powering bad for a mic? Will
it overwork it?

C

50V is just fine. There is a pretty large tolerance for phantom power
voltage for most mics - many will work down to less than half the
normal 48V.

d

--
Pearce Consulting
http://www.pearce.uk.com

[Laurence Payne[_2_]]

On Tue, 25 Mar 2008 07:29:50 -0700 (PDT), C
wrote:

So I've learned some lessons recently about the importance of true 48v
power with the correct amount of millamps,etc. One of my Ph.power
supplies actually provides 50v. Is over powering bad for a mic? Will
it overwork it?

Is that a rated figure or a measurement you took? If a measurement,
what was the load?

[Roy W. Rising[_2_]]

C wrote:
So I've learned some lessons recently about the importance of true 48v
power with the correct amount of millamps,etc. One of my Ph.power
supplies actually provides 50v. Is over powering bad for a mic? Will
it overwork it?

C

50V is well within tolerance. Sennheiser -P48 mics spec +/-12V! EV System
C mics are spec'd at 12V and work with 8-48V. The Shure VP88 accepts
9-52V. And so on.

--
~
~ Roy
"If you notice the sound, it's wrong!"

[Scott Dorsey]

C wrote:
So I've learned some lessons recently about the importance of true 48v
power with the correct amount of millamps,etc. One of my Ph.power
supplies actually provides 50v. Is over powering bad for a mic? Will
it overwork it?

The ISO spec is 48V, +/-3V, so 50V is within the spec. The big deal, though,
is that it can deliver enough current that the voltage doesn't drop too much
on load; the source impedance needs to be very close to 6.81K.
--scott
--
"C'est un Nagra. C'est suisse, et tres, tres precis."

[Don Pearce]

On 25 Mar 2008 13:21:00 -0400, (Scott Dorsey) wrote:

C wrote:
So I've learned some lessons recently about the importance of true 48v
power with the correct amount of millamps,etc. One of my Ph.power
supplies actually provides 50v. Is over powering bad for a mic? Will
it overwork it?

The ISO spec is 48V, +/-3V, so 50V is within the spec. The big deal, though,
is that it can deliver enough current that the voltage doesn't drop too much
on load; the source impedance needs to be very close to 6.81K.
--scott

Make that 3.4k. That pair of 6.8k resistors works in parallel for DC
supply.

d
--
Pearce Consulting
http://www.pearce.uk.com

[Scott Dorsey]

Don Pearce wrote:
On 25 Mar 2008 13:21:00 -0400, (Scott Dorsey) wrote:

C wrote:
So I've learned some lessons recently about the importance of true 48v
power with the correct amount of millamps,etc. One of my Ph.power
supplies actually provides 50v. Is over powering bad for a mic? Will
it overwork it?

The ISO spec is 48V, +/-3V, so 50V is within the spec. The big deal, though,
is that it can deliver enough current that the voltage doesn't drop too much
on load; the source impedance needs to be very close to 6.81K.

Make that 3.4k. That pair of 6.8k resistors works in parallel for DC
supply.

Sort of. Sometimes the two signal pins are not a common load!
Anyway, 6.81K per pin.
--scott

--
"C'est un Nagra. C'est suisse, et tres, tres precis."

[Arny Krueger]

"C" wrote in message


So I've learned some lessons recently about the
importance of true 48v power with the correct amount of
millamps,etc. One of my Ph.power supplies actually
provides 50v. Is over powering bad for a mic? Will it
overwork it?

Per spec, no. IME with faulty mics, it can matter.

At one point I had 2 MXL 603s that worked fine on 48volts or less, but were
terribly noisy on ca. 48.01 volts or more. Obviously a product fault. It
took a trip back to the importer to get them made right. When they came
back, they properly didn't care.