Serie PowerPro/
PowerPro series
Manual del usuario /
User's manual
9
INTRODUCTION
General
Thank you for purchasing a D.A.S. power amplifier. It has
been built with the most advanced modular technology, and
has been designed through the use of computer-aided
design for both the electronic and mechanical parts.
Features
•
Class AB
•
Linear Switching Power
•
Dual balanced XLR inputs
•
Binding post and Speakon output connections (PS-800
and PS-1400 only)
•
Variable speed back-to-front fan cooling
•
Front located volume controls
•
Input Sensitivity switchable between 0.775V, 1V and
1.44V.
•
Ground loop selector.
•
Stereo, parallel and mono operation modes
•
Complete and independent protections on each
channel against output short-circuits, overloading and
overheating
•
The power supply is protected against short-circuits,
voltage and current overloading; triggering the latter to
the standby mode
•
Clip limiters
•
Clip, protection and idle LED indicators
FRONT PANEL DESCRIPTION
A) POWER SWITCH
Turns the amplifier on ("|" position") , and turns the
amplifier off ("0" position).
B)
POWER
LED
When these green LEDs illuminate, it indicates that
both amplifier channels are ready.
C) INPUT
LEVEL
CONTROLS
Volume levels for each channel can be adjusted by using
the knobs found on the front panel. Gain is maximum when
the
LEVEL
rotary potentiometer is rotated fully clockwise.
D)
CLIP
LED
In the event that the signal’s excursion exceeds the
maximum voltage from the power supply, the unit will
indicate saturation through the clip LED of the channel
involved. An automatic limiting system will impede
prolonged saturation.
E)
PROTECTION
LED
When a channel's output is disconnected by the amplifier's
protection, this yellow LED is on.
A channel’s protection may be triggered by:
•
Overheating sensed at any part of a channel. When the
amplifier has cooled down, the channel’s output will
be connected and operation will resume. The control
circuit has some degree of built-in hysterisis to avoid
turn-on and off oscillations.
•
Presence of DC at a channel’s output. Since it may
severely damage speakers, the amplifier will
deactivate the output in the event that DC levels are
too high. Once DC is no longer present, the
PROTECTION
LED will turn off and output is
reactivated.
•
Short-circuit at a channel’s output (only PS-200 and
PS-400) or load impedance is too low this protection
is activated. In this case, once the short circuit is
gone the output is NOT reactivated; the amplifier
needs to be switched off and on to reactivate.
•
When the amplifier is switched on, the output is also
deactivated for a few seconds to prevent dangerous
transients from damaging the speakers, and the
PROTECTION
LED is on until the amplifier is ready for
use.
PS-400
ELECTRONICS
Protection
Clip
Signal
Signal
Protection
Clip
Level A
Level B
PowerPro Series
On
On
F
E
D
B
A
G
C
PS-800
ELECTRONICS
®
Level A
Level B
PowerPro Series
Protection
Clip
Signal
On
Protection
Clip
Signal
On
On
F
E
D
B
A
G
C
PS-200, PS-400
PS-800, PS-1400
