7
r
BIAS ADJUSTMENT
Instruments, materials and tools:
- Audio Generator
- Dual Trace Oscilloscope
- Digital Voltmeter (or Multimeter)
- 4
Ω
500W and 8
Ω
100W Resistors
- Temperature Meter
Setup:
- Connect the Audio Generator to the input and set its output at 2KHz sinusoidal signal.
- Insert the temperature sensor through the interstize between the heatsink and R93 (PTC).
- Connect the 4
Ω
500W resistor to the amplifier output instead of the woofer speaker and 8
Ω
100W instead of tweeter speaker.
- Connect the oscilloscope probes (setting 20V/div.,1ms/div.) on the loads.
- Insert the voltmeter terminals on R107.
ADJUSTMENT PROCEDURE
1) Turn on the amplifier, pressing "UP" "DOWN" and "MIDI" simultaneously, check that the display shows "C".
2) Set the input signal to 0dB (0.775Vrms).
3) When the temperature has reaches about 45°C (109°F) set the signal input to minimum (0 or -
).
4) Adjust the trimmer R111 to read a voltage of 6mV ±0.1 on the multimeter.
5) Check that the voltage across the R108 resistor has the same value.
6) At the same temperature condition, adjust the VR1 trimmer to read 2.2mV ±0.1 at R24 resistor.
7) Check that the voltage on the R25 resitor has the same value.
Veryfing:
1) Increase the input level to obtain an output voltage about of 0.5Vpp.
2) Check with the oscilloscope that the output signal is without a cross-talk distortion and eventually slightly
adjust the R111 or VR1 position until distortion disappears.
(Note: the voltage value across the R107 or R108 resistor must not exceed 10mV and the R24 or R25 resistor must
not exceed 4mV).
LIMITER ADJUSTEMENT
1) Increase the input level to 10dB, adjust the trimmer VR1 until clipping distortion disappears.
2) Verify tha the led change colour from green to red.
3) Re-connect the speakers instead of the 4
Ω
and 8
Ω
resistors.
TOUR MASTER 15,2 ACTIVE - Technical Specification
SPEAKER SPECIFICATIONS
COMPONENTS
High
2" driver with controlled directivity horn
Low
15" low frequency speaker
HIGH section POWER HANDLING
W continuous
75
(EIA RS-426A)
W peak
240
LOW section POWER HANDLING
W continuous
800
(EIA RS-426A)
W peak
2400
IMPEDANCE (nominal)
High
ohm
8
Low
4
CONSTRUCTION
Cabinet: birch playwood
Finish: Black scratch-resistant paint
Protection grille: metal grille
WEIGHT
kg - lbs.
48,5 - 106,8
DIMENSIONS
mm - in.
470x790x465 (LxAxP) - 185x311x183(WxHxD)
PROCESSOR SPECIFICATIONS
INPUT
Sensitivity
dB
0 (0.775Vrms)
Impedance
Kohm
30 (balanced) - 15 (unbalanced)
A/D converter
bit
18
D/A converter
bit
18
Dynamic range
dB
105
Sampling rate
KHz
48
CROSSOVER
Frequency
Hz
1350
Slope
dB/oct.
24
HIGH section POWER AMPLIFIER
W continuous
150
LOW section POWER AMPLIFIER
W continuous
650
AMPLIFIERS DISTORTION
THD +Noise
<0,02%
CONTROLS
VOLUME control
UP & DOWN selector buttons
MIDI button
Earth Lift
DISPLAY
2-digit display
SIGN/COMP LED
CONNECTORS
1 XLR-F +1 XLR-M (input + link)
MIDI in & MIDI THRU
POWER SUPPLY
230V ±15% 50/60Hz - 115V ±15% 50/60Hz
SYSTEM SPECIFICATIONS
FREQUENCY RESPONSE
Hz
50 ÷ 20000 (-10dB)
SENSITIVITY
SPL 1W/1m dB
98
MAX SPL continuous
127
DISPERSION ANGLE
horizontal °
60 (±10)
vertical
40 (±7)
DIRECTIVITY Factor (Q)
12
DIRECTIVITY Index Di
dB
11 (+2.8 , -4)
Note:the system specifications have been calculated using PRESET n.1 FLAT