Control Elements - Alto D1 Owner's Manual

Front Panel:
1 POWER SWITCH & INDICATOR LED
It powers the D amplifier ON and OFF . When the D amplifier is turned on the
power switch illuminates blue.
2 SIGNAL LED
This LED will light up green when the signal at the output is at least -20 dB.
3 CLIP LED
This LED will flash when distortion reaches a level of 0.5%, Turn the relative
GAIN control down so that the CLIP LEDs only flash occasionally.
4 PROTECTION LED
It will light up when the unit is in Protection Mode due to short circuit, low
impedance load or other causes.
5 GAIN CONTROLS
These controls are used to adjust the output signal level.
6 COOLING VENTS
Allow air circulation from front to back of the amplifier.
SIG CL P PROT
0
1
6
2
6
CH1
SIG CLIP PROT
20
18 22
1 24
12 26
6 28
CH1
30 (dB)

3. CONTROL ELEMENTS

S G CLIP PROT S G C IP PROT SIG CL P PROT
2
2 1 2 22 1 22
24 16 24 16 24 16 4
6 1 26 1 26 12 6
28 6 8 6 28 6 28
CH2 CH3 CH4
30 dB) 0 dB) 0 (dB 0 dB)
3
4
2
SIG CL P PROT S G CLIP PROT SIG CLIP PROT
20 20 20
18 22 18 22 18
16 24 1 24 16
12 26 12 26 12
6 28 6 28 6
CH2 CH3 CH4
30 dB) 30 (dB)
5
1 6
22
24
6
28
30 dB)
D2
500W 4
5