Studer A1 - A1: SPL and EQ Fine-Adjustment; A1: Distortion Check

A Series Active Monitor Speakers
Date printed: 29.02.00 Service E4/11
4.3.2.5 A1: SPL and EQ Fine-Adjustment
• Set balanced generator to 245 mVRMS (i.e. –12.2 dBV or –10 dBu);
• Plot frequency response sweep @ 1 m: tolerance according to the graph
below;
• EQ fine-adjustment possibilities:
1. Overall tweeter level (4…20 kHz) with trimmer potentiometer RT200
2. Tweeter level @ 12.2 kHz with trimmer potentiometer RT1
3. Tweeter level @ 20 kHz with trimmer potentiometer RT2.
Note: Basic setting of RT1 and RT2: refer to section 4.3.1.5.
4.3.2.6 A1: Distortion Check
• Set balanced generator to 245 mVRMS (i.e. –12.2 dBV or –10 dBu);
• Plot a 20 Hz…20 kHz THD sweep @ 1 m: < 1% (75 Hz…15 kHz).
SPL @ 1 m
20 50 100 200 500 1 k 2 k 5 k 10 k 20 k
+10
0
–10
–20
–30
[dB]
[Hz]
THD + N
20 50 100 200 500 1 k 2 k 5 k 10 k 20 k
10
2
1
0.2
0.1
[%]
0.5
5
[Hz]