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CROSSOVER SETTINGS
AND GAIN ADJUSTMENT
Your Polk Audio power amplifier needs to be adjusted
carefully to achieve maximum performance. These are
some guidelines to follow when fine-tuning the amplifier.
•
For full-range and simultaneous stereo/mono bass
applications, the crossover selection switch should
be set to FULL. If the amplifier is driving your sub-
woofers, set the switch to LOW, and for mid-bass/
midrange output, set to HIGH.
•
The crossover frequency control needs to be adjusted
to suit your particular system. For subwoofer appli-
cations, try and keep the setting low enough to prevent
image smearing (you should not be able to hear male
voices from the subwoofer) but not so low as to create
a gap between the subwoofer and the mid-bass/
midrange speakers. For mid-bass/midrange settings,
try to keep the setting low enough to keep your sound
stage in front of you, without overdriving the speaker.
It will be to your advantage to spend some extra time
with this adjustment, listening to familiar music or
system set-up discs to achieve the kind of musical
reproduction that you prefer.
•
The gain adjustment allows you to set proper signal
match for clean, quiet amplifier operation. For full-range
and simultaneous stereo/mono bass applications, start
by playing some music you are familiar with. With the
gain adjustment on the amplifier in the middle of its
rotation, bring up the volume on your head unit to the
3/4 volume setting or until you start to hear distortion
or clipping. If you hear distortion before you reach the
3/4 volume setting of your head unit, reduce the gain
setting on the amplifier and start to raise the head unit
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P A 1 2 V A M P L I F I E R S
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volume again. When you can listen to the music at or
slightly above 3/4 on your head unit without audible
distortion, slowly raise the gain of the amplifier until
distortion is heard, then back off the gain until the
distortion is not audible. This setting will allow you
to reach full output with all but the quietest of source
material, while avoiding excessive noise in the system.
NOTE: Polk amplifiers use a digital gain control with
a finite number of adjustment steps. A very small adjust-
ment may not cause any audible change in level.
LED TUBE INSTALLATION (OPTIONAL)
These Polk Audio amplifiers have been designed with
a custom heat sink that can accommodate two
(optional—not supplied) VARAD LED tubes.
1. Before installing the LED tubes, remove and discard
the mounting feet from the VARAD LED tubes.
2. Slide each LED tube assembly into your Polk Audio
amplifier heat sink. Ensure that the LEDs are facing
out for optimal visibility. The wires from the LED tube
assembly should be on the signal input end of the
amplifier. The Black wire from the LED tube is ground
and the Black/White wire from the LED tube is power.
3. Run the two wires from the tube assembly and
connect them to the 4-pin LED/FAN input connec-
tor. Refer to the LED/FAN harness diagram given
earlier in this manual.
NOTE: If the optional fan IS NOT being used, we recom-
mend that the second LED tube be wired to this circuit.
If the optional fan is being used, we recommend that the
second LED tube be wired in parallel with the first LED tube.
CEA SPECIFICATIONS
Power Output: 90 Watts RMS x 2 channels at 4 Ohms and ≤ 1% THD+N
PA250.2
Signal to Noise Ratio: -70 dBA (reference 1 Watt into 4 Ohms)
Additional Power: 125 Watts RMS x 2 channels at 2 Ohms and ≤ 1% THD+N
SPECIFICATIONS
Dynamic Power Rating @ 2 Ohms
RMS Continuous Power @ 2 Ohms
RMS Continuous Power @ 4 Ohms
RMS Continuous Power
Bridged 4 Ohms
3
Signal-to-Noise Ratio
Frequency Response
Damping Factor
Crossover
Bass Equalization
(Variable or Fixed)
Input Impedance
Input Sensitivity
Output Impedance
Supply Voltage
Fusing and Power/Type
Minimum Cable Requirements
(AWG) (Per amp, Trunk Mounted)
1
RMS continuous power driven into 4 Ohms from 20 to 20,000 Hz @ 14.4VDC with less than 0.08% THD+N.
2
RMS continuous power driven into 2 Ohms from 20 to 20,000 Hz @ 14.4VDC with less than 0.15% THD+N.
3
RMS continuous power bridged into 4 Ohms from 20 to 20,000 Hz @ 14.4VDC with less than 0.15% THD+N.
ENGLISH
PA250.2
200W x 2
2
125W x 2
1
90W x 2
250W x 1
Greater than 90 dB
20-20,000 Hz + _ 0.25 dB
Greater than 100
Switchable high or low pass
12dB/octave, 100Hz
+8 dB, centered at 40Hz
20K Ohms
Variable from
250 mV to 7.5 volts
2 to 8 Ohms, stereo
4 to 8 Ohms, bridged
10 to 16 VDC
30A
#10
W W W . P O L K A U D I O . C O M / A M P S
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