10
5.
APPLICATION
AND
TROUBLE
SHOOTING
TIPS
The XT Series makes up components of a high-quality professional sound reinforcement system designed for use in both indoor,
and dry outdoor applications. Some basic precautions will insure long-term reliability.
EQUALIZATION
AND
GAIN
The XT-15A SUB and 18A SUB have all the required equalization and gain functions included in the digital signal processing circuits.
Both the equalization and gain functions have been optimized for flat frequency response and maximized system dynamics.
If distorted sound is heard the gain and EQ settings on the outboard mixer and any other external equipment should be carefully
checked to ensure that the input section of the XT enclosure is not overloaded.
If additional equalization is required, care should be taken to avoid excessive EQ in any frequency band, but particularly at low
frequencies. Excessive equalization can produce “band selective” clipping and distortion. All EQ boost levels should be monitored
if system distortion is present.
PROBLEM: Distorted sound
When input levels to the XT amplifiers exceed 0.775 V RMS for line level inputs it is possible to produce system clipping or
overdrive. It is still possible to “overdrive” the input section of the enclosure. If distorted sound is present the following steps
should be taken:
1.
Verify that the mixer’s output is not clipping or overloaded. If the output metering section of the mixing console is
continuously in the “red” then the output level should be reduced. (occasional “red” indications are usually fine and are
dependent on the mixing console’s output capability).
2.
Verify that excessive equalization is not present anywhere in the signal chain.
3.
Verify that AC mains levels are within the required range.
Voltage measurements on the AC Mains should be performed by a licensed electrician or individual trained in making
high-voltage measurements.
PROBLEM: No sound from active units
1. Verify that the amplifier pilot light is on.
2. Verify that there is AC Mains voltage on the AC Mains input to the amplifier.
NOTE:
NOT DO ATTEMPT TO REPLACE THE FUSE. THERE ARE NO USER SERVICABLE PARTS INSIDE THE XT SERIES
AMPLIFIERS.
Summary of Contents for XT Series
Page 1: ...P AUDIO XT SERIES MANUAL...