5
6
Line Out
The ¼” line out is used to connect to the input of another piece of equipment such as a another amplified
speaker. The outputs are monaural and volume level will depend on the volume of the source. For example,
the tape or CD player level is controlled by the tape/CD volume control. Line out is independent of the
Volume Control.
Tone Controls
The separate base and treble controls provide a wide range of adjustment for increasing or decreasing
either the bass or treble from “flat” frequency response. The center or “12 o’clock” position is flat.
Mic Input (Unbalanced)
An unbalanced, low impedance microphone input. For use with standard dynamic microphones that have a 1/4”
phone plug.
Mic Input (Balanced)
Use this input for a dynamic (low impedance) microphone with an XLR plug or condenser/electret (high
impedance) microphones which may need phantom (polarizing) voltage.
Mic Impedance Switch
This switch is used to compensate for mic impedance differences. It assures full amplifier output regardless
of the microphone used. Note: All connections must be made with shielded cable to avoid hum, buzzing,
or radio interference.
Feedback Information
What is Feedback?
Feedback is a ringing, howling, or shrill sound that is self-generated by the sound
system when using a microphone. It is the result of sound from the speakers being picked up by the
microphone(s) in use and then re-amplified by the system. This can form a self-sustaining loop that can
damage the sound system if allowed to continue, not to mention annoyance to persons nearby.
How to prevent feedback
ALWAYS STAND BEHIND THE SPEAKER WHEN USING A MICROPHONE. If feedback does occur, immediately
reduce the volume. Always plug in the microphone before turning on the power. Reducing the “treble”
control may also help.
Specifications
Rated power output:
15 watts RMS at 2% THD
Sensitivity for rated output: Line:
125 mVrms
Microphone:
4 mVrms
Auxiliary:
250 mVrms
Frequency response:
60 Hz – 20 kHz+ 3dB
Treble:
+dB, -10dB, 10kHz
Bass:
+5dB, -4.5dB 70Hz
Speaker
Woofer:
6” High-efficiency, 4 Ohms, with non inductive external shield
Tweeter:
2” mylar dome, with crossover capacitor
Crossover:
L/C – 6dB/Octave @ 4kHz
Volume control:
Steps up/down 4.5 dB per step. 10 steps to maximum volume
Inputs
Line inputs (2):
Hi-Z, RCA (summing L+R)
Balanced mic:
Hi or lo-Z, with phantom power (+15 volts D.C.)
Unbalanced mic:
Lo-Z, ¼” –phone
Auxiliary:
Hi-Z Mono ¼” –phone
Line output (2):
250mv at 15 watts RMS 2 - RCA, 1 - ¼”
Remote Control distance:
30 Feet
UHF Receiver:
16 selectable channels with switching antennas 902-928
AC Power requirements:
90-240 volts AC, 50-60Hz via universal power adapter
Dimensions (HWD):
6-1/4” x 10” x 8-1/2”
Combined shipping weight:
80 lbs
Specifications subject to change witho ut notice.
Troubleshooting Guide
:
Condition
Possible Solution
No sound (power LED not lit):
Turn POWER switch on plug in power cord
No sound (power LED lit):
Check for output from audio source make sure all cables are completely
plugged in mic switch on increase volume control
Distorted sound:
Check input cable connection lower input signal level reduce bass and/or treble
Excessive hum or noise:
Use shielded input cable
I
MPORTANT SAFETY INFORMATION
As with any electric / electronic device, care should be taken during use. Always turn off amplifier before opening or servicing any
part of the unit. Please handle your lectern with the care it deserves.
PL-19 Manual - JH 2010.03.18.indd 8-9
3/19/2010 10:01:47 AM