8
IMPORTANT: ALLOWING THE AMPLIFIER TO OPERATE WITH ONE OR
MORE CHANNELS IN PROTECT MODE FOR AN EXTENDED PERIOD OF
TIME CAN DAMAGE THE AMPLIFIER.
Protection Circuitry and LEDs
The Sonamp amplifiers have a multi-stage protection system to
prevent damage to your amplifier and speakers.
Amplifier Channel Protection DSP 2-750 MKII
If a channel encounters a short-circuit (in bridge mode the
protection circuitry will sense a short circuit across both positive
speaker terminals), or extremely low impedance will cause the
affected channel outputs to automatically mute. The output of
the affected channel will remain muted until the fault has been
corrected. Only the affected channels output will mute, all other
channels will continue to operate normally.
Amplifier Channel Protection Indication
On the front panel of the Sonamp DSP 2-750 MKII amplifiers are
dual color LEDs that illuminate to indicate the current operating
status of each amplifier channel.
When the LED blinks red this is an indication that the channel is
being over driven.
When the LED lights are solid red this is an indication the amplifier
is in protect mode. While in protect mode the LED lights will
periodically light green to retest the output to determine if the short
has been removed. Protect mode could be caused by a short in
the wire, overheating of the amplifier or possibly an internal problem
with the amplifier.
If the amplifier senses a very low impedance or a short on its
outputs, then it will mute its output and the protection LEDs will
turn red. The output will remain muted until the fault is cleared.
Check the rear panel block connector for shorted wire strands
or reduce the number of speakers connected in parallel to the
amplifier outputs. Sonance amplifiers are rated for a 4 ohm load or
higher, such as two pair of eight ohm speakers.
Rack Ear Installation DSP 2-750 MKII
The DSP 2-750 MKII ships with two rack ears. Unscrew the four
Phillips head screws (M4 x 0.7 pitch x 10mm long) found on each
side of the left and right forward section of amplifier. Use these
screws to connect the included rack ears to the amplifier
(see Figure 15).
Figure 15: Rack Ear Installation DSP 2-750 MKII
Amplifier Stacking
The DSP 2-750 MKII is capable of being directly stacked with the
feet removed (see Figure 16) for use in low to moderate output
applications. For high-output applications, it is recommended to
leave at least 1U space between amplifiers for increased ventilation.
It is not recommended to stack more than three amplifiers high
without spacing.
MKII
MKII
MKII
Figure 16: Stacked Configuration DSP 2-750
IMPORTANT: ANY TIME THE PROTECTION CIRCUITS ARE TRIGGERED,
UNPLUG THE AMPLIFIER’S POWER CORD FROM THE WALL OUTLET
BEFORE TROUBLESHOOTING.
Amplifier Power Supply Protection DSP 2-750 MKII
The amplifier also has protection for the power supply. If the power
supply heat sink temperature exceeds the design maximum, the
protection circuit will activate, disconnecting all channel outputs.
This is indicated by a blinking light on the front panel power switch.
NOTE: IF SHELF MOUNTING, ATTACH THE FOUR INCLUDED FEET BY
SCREWING THEM INTO THE THREADED OPENINGS ON THE BOTTOM
CHASSIS. NO TOOL IS REQUIRED.
Front View
Side View Right
Front View
MKII
