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PA 12V AMPLIFIERS
12
PA250.2 PowerOutput: 90 Watts RMS x 2 channels at 4 Ohms and ≤1% THD+N
Signalto Noise Ratio: -70 dBA (reference 1 Watt into 4 Ohms)
AdditionalPower: 125 Watts RMS x 2 channels at 2 Ohms and ≤1% THD+N
SPECIFICATIONS PA250.2
DynamicPower Rating @ 2 Ohms 200Wx 2
RMSContinuous Power @ 2 Ohms2125W x 2
RMSContinuous Power @ 4 Ohms190W x 2
RMSContinuous Power
Bridged4 Ohms3250W x 1
Signal-to-NoiseRatio Greaterthan 90 dB
FrequencyResponse 20-20,000Hz +_0.25dB
DampingFactor Greaterthan 100
Crossover Switchablehigh or low pass
12dB/octave,100Hz
BassEqualization
(Variableor Fixed) +8dB, centered at 40Hz
InputImpedance 20KOhms
InputSensitivity Variablefrom
250mV to 7.5 volts
OutputImpedance 2to 8 Ohms, stereo
4to 8 Ohms, bridged
SupplyVoltage 10to 16 VDC
Fusingand Power/Type 30A
MinimumCable Requirements
(AWG)(Per amp, Trunk Mounted) #10
1RMScontinuous power driven into 4 Ohms from 20 to 20,000 Hz @ 14.4VDC with less than 0.08% THD+N.
2RMScontinuous power driven into 2 Ohms from 20 to 20,000 Hz @ 14.4VDC with less than 0.15% THD+N.
3RMScontinuous power bridged into 4 Ohms from 20 to 20,000 Hz @ 14.4VDC with less than 0.15% THD+N.
CEASPECIFICATIONS
CROSSOVERSETTINGS
ANDGAIN ADJUSTMENT
YourPolk Audio power amplifier needs to be adjusted
carefullyto achieve maximum performance. These are
someguidelines to follow when fine-tuning the amplifier.
•Forfull-range and simultaneous stereo/mono bass
applications,the crossover selection switch should
beset to FULL. If the amplifier is driving your sub-
woofers,set the switch to LOW, and for mid-bass/
midrangeoutput, set to HIGH.
•Thecrossover frequency control needs to be adjusted
tosuit your particular system. For subwoofer appli-
cations,try and keep the setting low enough to prevent
imagesmearing (you should not be able to hear male
voicesfrom the subwoofer) but not so low as to create
a gap between the subwoofer and the mid-bass/
midrangespeakers. For mid-bass/midrange settings,
tryto keep the setting low enough to keep your sound
stagein front of you, without overdriving the speaker.
Itwill be to your advantage to spend some extra time
withthis adjustment, listening to familiar music or
systemset-up discs to achieve the kind of musical
reproductionthat you prefer.
•Thegain adjustment allows you to set proper signal
matchfor clean, quiet amplifier operation. For full-range
andsimultaneous stereo/mono bass applications, start
byplaying some music you are familiar with. With the
gainadjustment on the amplifier in the middle of its
rotation,bring up the volume on your head unit to the
3/4volume setting or until you start to hear distortion
orclipping. If you hear distortion before you reach the
3/4volume setting of your head unit, reduce the gain
settingon the amplifier and start to raise the head unit
volumeagain. When you can listen to the music at or
slightlyabove 3/4 on your head unit without audible
distortion,slowly raise the gain of the amplifier until
distortionis heard, then back off the gain until the
distortionis not audible. This setting will allow you
toreach full output with all but the quietest of source
material,while avoiding excessive noise in the system.
NOTE: Polkamplifiers use a digital gain control with
afinite number of adjustment steps. A very small adjust-
mentmay not cause any audible change in level.
LEDTUBE INSTALLATION (OPTIONAL)
ThesePolk Audio amplifiers have been designed with
acustom heat sink that can accommodate two
(optional—notsupplied) VARAD LED tubes.
1.Before installing the LED tubes, remove and discard
themounting feet from the VARAD LED tubes.
2.Slide each LED tube assembly into your Polk Audio
amplifierheat sink. Ensure that the LEDs are facing
outfor optimal visibility. The wires from the LED tube
assemblyshould be on the signal input end of the
amplifier.The Black wire from the LED tube is ground
andthe Black/White wire from the LED tube is power.
3.Run the two wires from the tube assembly and
connectthem to the 4-pin LED/FAN input connec-
tor.Refer to the LED/FAN harness diagram given
earlierin this manual.
NOTE:If the optional fan IS NOT being used, we recom-
mendthat the second LED tube be wired to this circuit.
Ifthe optional fan is being used, we recommend that the
secondLED tube be wired in parallel with the first LED tube.