130V Phantom Power

[owel]

What's the whole deal with 130V phantom power?

What's the current requirements for 130V phantom power mics?

Are they the same with 48V pp? i.e. 10mA max?  -- then, that would be 1.3Amps???

or is it lower?

Thanks for any info.

 

[mjk]

The only 130 volt mic power I know of is the B&K (DPA) system used on the 4003, 4006, etc. which is sometimes called 130 volt phantom power. It's actually a separate DC line from the signal line so technically not "phantom" power. DC and signal share a common return, and the mics draw about 4mA.

Cheers,

Michael

 

[owel]

The only 130 volt mic power I know of is the B&K (DPA) system used on the 4003, 4006, etc. which is sometimes called 130 volt phantom power. It's actually a separate DC line from the signal line so technically not "phantom" power. DC and signal share a common return, and the mics draw about 4mA.

Cheers,

Michael

So it's not using a 3-pin XLR? 

 

[mjk]

It's a 4 pin xlr connected as shown in page 5 of the user manual:

http://www.dpamicrophones.com/sitecore/shell/Controls/Rich%20Text%20Editor/~/media/PDF/Download/Users%20Manuals/UM%204003%20%204006.pdf

These mics require a special input circuit and are not compatible with the typical 1000-1600 ohm balanced mic input.

Michael

 

[owel]

Thank you. 

One last question... the output of the 4003 is also unbalanced?

 

[PRR]

> These mics require a special input circuit

That looks a lot like a B&K measurement mike I once had. >100V DC to the head for polarization and to power a buffer, NOT Phantom, unbalanced back to the power-box. Interface out of powerbox could be anything; mine was a simple unbalanced output suitable for small-lab use.

 

[mjk]

The 4003 has a pre-polarized (electret) capsule and uses the +130V to power the buffer.

The output is unbalanced (that is, single ended) and rides on ~62V DC wrt. the ground pin (measured on one mic)

Maximum signal at clipping is ~+34 dBu

Cheers,

Michael


----From the user manual------

Output impedance:
4003 and 4006: <75 Ohm

Cable drive capability:
4003: From microphone to HMA5000: Up to 20 m (66ft)

Polarity:
4003: Positively increasing sound pressure produces positive-going voltage at pin 4.
Pin 1: Ground, Pin 2: Not used, Pin 3: 130 V DC preamplifier supply, Pin 4: Signal. (See Fig. 1)