Block Diagram; Other Functions, Protections - Prolude Amplification BHN450 User Manual

5.3 Block diagram

Phantom
power
Bright
Active
1.
Input
Active 2
stage
Passive
Return
10.
Level
Det.

5.4 Other functions, protections

5.4.1 Short circuit protection
The amplifier contains a protection circuit against wrong / shorted / speaker cable or burnt speakers.
5.4.2 Speaker protection
The speaker cabinets are protected against a possible malfunction of power stage. This circuit detaches the
speaker cabinets when power stage fault occurs, protecting the cabinets from halmful direct current.
5.4.3 Click noise reduction
The connection of the speaker cabinets is internally delayed after switching on, therefore there is no click
noise on the speaker cabinets when switching on or off.
5—12
FS1: Shape / Valve Loop
Gain
2. 3.
Preamp Shape
Mute Volume
6. 7.
Comp. Volume
Control
11. 12.
Noise Phone
Gate Amp.
Noise Gate,
On
13.
Line
Buffer
GND Lift
Shape Bass, Treble, On
4.
Valve
Loop
16.
Limiter
8.
Power
Amp.
Phone Out
Line Out
Low, Low-Mid, Mid-
freq, Mid, High
FS2
5.
Active Eq.
9.
Speaker
Prot.
14.
Overheat
Sense
15.
Fan
Control
Send
Speaker
Out