Bose Personalized Amplification System Troubleshooting Manual page 7

Ch1 In
Ch2 In
L
S-DATA Out
(to SPDIF)
R
Ch 3 In
Ch 4 In
Power supplies
To ensure that the system operates normally, the system must be supplied with seven different
voltage levels, +3.3V, +5V, +15V, -15V, +24V, +27V, and -27V. Refer to the block diagram below.
THEORY OF OPERATION
DSP Processing Block Diag
NoiseGate User EQ
NoiseGate User EQ
Sys. EQ+X-Over, Hi
Sys. EQ+X-Over, Lo
Master Vol. Range: -80 to +22dB (+10 @ 12:00)
Figure 5. DSP Functional Block Diagram
Figure 6. DC Power Supply Block Diagram
Preset EQ
Preset EQ
Limiter
Knee=+1.5dBV
Limiter
7
Hi Out
Bass Out