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A Series Active Monitor Speakers

E4/12 Service Date printed: 29.02.00

4.3.2.7 A1: Polarity Check

• Place the measurement microphone at a distance of 10 cm from the baffle

and exactly in the center of the woofer.

Steps Generator Measurement

No. Description Id Value Test pos. Type Value Limits

1 System polarity G1 –14 dBV (245 mV

RMS

)/120 Hz/sine wave P1* Phase 0° ±20°

*Note: Without compensation, the microphone Brüel & Kjær BK4133+2639 is inverting

4.3.2.8 A1: Overall Phase Check

• Place the measurement microphone again on-axis, according to 4.3.2.4,

distance 0.806 m;

• Set the phasemeter propagation delay time to 2.91 ms (corresponding to a

distance of 1 m);

• Set balanced generator to 245 mVRMS (i.e. –12.2 dBV or –10 dBu);

• Plot a phase sweep 20 Hz…20 kHz according to the graph below;

• If the result is above the tolerance, increase the microphone distance, or if

the result is below the tolerance, decrease the microphone distance, and re-

peat the phase sweep.

100

1 k

–

180

–

135

–

–45

135

180

20 k

10 k

20 50

200

500 2 k 5 k

[ °]

Phase

[Hz]

Studer A1 User Manual

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