Amplifier operation – Fender SPL-M500 User Manual

Page 7

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The SPL-M500 is timed to turn on the speaker
outputs after the amplifier's power supply is fully
charged up, thus preventing any turn-on noise.
Timing of the amplifier's turn-on circuit is usually
sufficient to accommodate all the turn-on anomalies
from other pieces of gear in a system, making it
acceptable to use a single switched power string in
a permanent or semi-permanent application.

The SPL-M500 can draw a lot
of AC power. Be sure the AC

power source for your AC distribution system
has adequate current capability.

In multiple amplifier installations, a sequential turn-on
(either manually or via timed relays) is recommended
to avoid a sudden major drain on the AC line.
Remember, severe reduction of power line voltages
affects the amount of power you can get FROM the
amplifier. If you need to run long AC extension
cords, make sure their conductors are as large as
practical (small gauge number). Just as smaller
diameter wire causes speaker lines loss, smaller
power lines cause loss. The effect of small AC lines
is one of the intermittent clipping under severe

1. Turn all equipment OFF.

2. Plug the AC cord into a power source with the
correct voltage. In the U.S. and Canada, this is a
120 Volt, 60 Hz AC. In other countries, this voltage
may vary from 100 to 240 Volts, 50 to 60 Hz AC.

3. Connect the wiring from the signal source to the
amplifier's input jack(s).

4. Connect the speaker(s) to the to the output

5. Adjust the input control level to the minimum
(infinity) setting. Set the notch sliders at 0 dB (top).

6. Turn all other equipment ON first, then the SPL-
M500 monitor amplifier.

7. Slide the level control slowly up and listen for any
feedback problem(s) that may occur.

8. If feedback is encountered, slide the appropriate






band) notch depth control down to

its lowest position. Next, turn the frequency control
knob to pinpoint the location of the problem
frequency and cancel it.

9. Slide the control level up until feedback or ringing
is heard, then move down until the feedback or
ringing stops.

10. Step 8 may need to be performed more than
once if several feedback problems occur


A. To reduce the chance of unwanted noise in your
system, keep all patch cables and input signal
cables away from all AC power cords, lighting
cables and speaker wires. Always use shielded
cables for all low level (input and patch point)
connections to this unit. Never use shielded cable
for speaker wires.

B. When a problem frequency occurs within the
overlapping part of the two adjacent frequency
bands, the notches can be dialed to have the same
center frequency. By doing so, the resulting notch
depth provided by the two notches will be deeper
than a single notch depth.

C. When two notches are juxtaposed, the result will
be a wider notch. This can be helpful in some
cases, but may not be desirable in normal operation
of the unit as audible frequency loss will occur.

D. When notches are not in use, all the notch sliders
must be at the top of their travel. A narrow band is
NOT a graphic equalizer. Do NOT put the notch
depth sliders in the middle of their travel to boost or
cut frequencies. These are CUT ONLY controls.

E. To help prevent overdriving this unit and unwanted
distortion, keep the Deltacomp

switch "in".

F. If you wish to obtain either the optional rear rack
ear supports (P/N 040661), please contact your
local authorized Fender Pro Audio dealer.