Sennheiser condenser microphones produce relatively high output voltages exceeding 1 volt at maximum sound pressure levels. This has the advantage that even with long cables induced interference signals can be disregarded. Also the internal noise produced by the microphone does not contribute to the total noise level. The microphones are titted with RF tilters which ensure that no high trequency signals trom the microphone can affect the external circuitry and that the microphone itselt is protected trom high trequency disturb- ance. It is theretore not necessary, even under the most difficult conditions, to take special precautions, such as double screening ot the cables or the provision ot high trequency tilters.

According to the DINstandard the teed resistors should be2 x appx. 6,8 kD. The difference between the two resistors should be

;;;;004% The current taken by Sennheiser condenser microphones MKH... P 48, is appx. 2 mA.

This means that approx. 7 volts are lost across the resistors.

Senn heiser condenser microphones are polarised according to DIN standard i.e. when apressure pulse strikes the capsule trom the tront Pin 1 ot the DIN-connector (resp. Pin 2 ot the Cannon-connec- tor) goes positive with reterence to Pin 3. This should be considered when e. g. the amplitier input plug is being wired for correct phasing.

Connection to balanced inputs

Phantom-powered microphones are generally to be connected to balanced ground-tree transtormer inputs.

In this case the microphone is simply connected via the power supply MZN 16 P 48 resp. MZN 16 P 48-U (see accessories) to the inputs ot the amplitier.

Connection to unbalanced inputs

In many cases, for example most home-tape recorders, the input socket is unbalanced. It a phantom-powered microphones is to be connected to such inputs it is generally necessary to use a transtor- mer. The secondary of this audio-transtormer may then be connected - one side grounded - to the input. Proper voltage matching is achieved by selecting a suitable transtormer ratio.

Connection to inputs with high sensitivity

 

 

MKH 406 P 48

Frequency response.

 

 

Operating principle .

 

..

Directional characteristic.

 

 

Sensitlvityat 1000 Hz.

 

 

Impedance at 1000 Hz.

 

 

Minimum load.

 

 

 

Signal to noise ratio to DIN 45590.

 

Maximal SPL

.

 

 

Operating voltage.

 

 

Current taken. . . . .

 

 

Temperature range

 

 

Output plug.

 

. 3-pln standard

Prn connections.

 

plug to DIN 41 524

 

1: Audio

(+);

 

 

Supply

(+)

 

 

2: Ground, housrng;

 

 

Supply (-)

 

 

3: Audio

(-);

 

 

Supply (+) according

 

 

to DIN 45596

Cable connector.

 

3-pln standard connector

 

 

to DIN 41524

Dimensions.

 

e.g. T 3261001

 

19 mm </;,150 mm long

Weight.

 

120 9

 

Finish.

 

dull black or satin nickel

MKH 406 P 48-U

40...20000 Hz

pressure gradient transducer

card ioid

20 mV/Pa:!: 1 dB (2 mVl~bar:!:1 dB) appx. 10.0, balanced, ground-free

1 k.o (200.0 for SPL up to 30 Pa) appx. 72 dB

75Pa 48V:!: 12V ca. 2 mA

-10°Cto+70°C 3-pin XLR plug

1:Ground, housing; Supply (-)

2:Audio (+); Supply (+)

3:Audio (-);

Supply (+) accordlng to IECstandard

Publication 268-14/2

3-prn connector XLR-3-11 C

19 mm </;,165 mm long

135 9

It the unit being used has a very high input sensitivity i.e. when it is normally intended tor use with dynamic microphones, it can be necessary to reduce the output voltage trom the microphone by means ot a voltage divider. This should be built into the microphone cable at the units input. This way the large signal on the microphone cable is maintained up to just betore the amplitier,

wh ich helps to increase the signal to noise ratio.

Connection to units with powering facilities

It an appropriate voltage source is available in the amplitier the condenser microphone can be powered directly. The voltage should be 48 volts :t 12 volts. It should be stabilised and tiltered, so that the unweighted noise voltage is less than 1 mV.

i---r

 

~

 

 

I

'L

I

 

 

:.A

 

~:

 

r

I

 

'

:.

~

I

I

 

I

 

I

 

c---I

 

~

 

Phantom-powering

48 V

alternatively

48V 3,3 kQ

according

to DIN 45596

 

We reserve the right to alter speciflcation. especially with regard to technical improvements.

Frequency
Response

 

 

 

 

 

 

dB

 

 

 

 

 

 

 

 

 

 

 

50 f---

 

-.

 

 

 

 

 

 

 

 

 

40

 

 

 

 

 

 

 

 

 

 

 

30

 

 

 

 

 

 

 

 

 

 

 

XJ

 

 

 

 

 

 

 

 

 

 

 

10

 

 

---

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

f---

-

.-

..-

 

.---

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

20

 

50

100

200

500

1000

2000

50OJ

10000

20000

Hz

Standard response curve with tolerances MKH 406 P 48.

The original diagram is included with each microphone, measured trom 50- 20000 Hz.

Accessories for MKH 406 P 48/ MKH 406 P 48-U

Microphone Clamp MZQ 415

The clamp can be titted on tripods, booms etc. with %" threads.

8

9