Polk Audio PA400.1 Multiple Amplifier Combinations, Crossover Settings And Gain Adjustment

MULTIPLE AMPLIFIER COMBINATIONS

The PA400.1, PA600.1, and PA1200.1 subwoofer amplifiers can also be used in Multiples of the MASTER/SLAVE combi- nations allowing for unlimited expansion to a system’s sub- woofer section. To use multiples of amplifier combinations the following directions must be adhered to for best results.

•Audio Signal—Divide the head unit or processor audio signal to the master amplifiers by using RCA Y adapters. Be sure to divide them an even number of times to ensure the input level at each master ampli- fier is matched.

•Amplifier Configuration—Set up each MASTER/ SLAVE amplifier combination as described for the combination type being used. (Refer to the Parallel Synced Gain or the External Synced Bridged section of this guide for amplifier and speaker connection descriptions.)

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.

•Because this amplifier is only designed for subwoofer applications, the low-pass crossover is active at all times. The crossover point is adjustable to allow more precise system operation.

•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. 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. 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 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.

•For systems using the Remote Sub Level Adjustment, increase the subwoofer gain on the amplifier by 25% and set the Remote Sub Level knob to the center position after making all system gain and filter adjustments.

This will give the Remote Sub Level Control a wider range of adjustment to the subwoofer output.

•You should take into consideration the effect that gain adjustment has on system frequency response and staging. Again, plan on spending some time with music that you know getting the gain and crossover settings the way you like. Test discs and analyzers may help with this process, but in the end it’s your ears that count, listen to the music!

LED TUBE INSTALLATION (OPTIONAL)

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.

ENGLISH

CEA SPECIFICATIONS

PA400.1 Power Output: 200 Watts RMS x 1 at 4 Ohms and ≤ 1% THD+N

Signal to Noise Ratio: -60 dBA (reference 1 Watt into 4 Ohms)

Additional Power: 400 Watts RMS x 1 at 1 Ohm and ≤ 1% THD+N

PA600.1 Power Output: 300 Watts RMS x 1 at 4 Ohms and ≤ 1% THD+N

Signal to Noise Ratio: -60 dBA (reference 1 Watt into 4 Ohms)

Additional Power: 600 Watts RMS x 1 at 1 Ohm and ≤ 1% THD+N

PA1200.1 Power Output: 400 Watts RMS x 1 at 4 Ohms and ≤ 1% THD+N

Signal to Noise Ratio: -60 dBA (reference 1 Watt into 4 Ohms)

Additional Power: 1200 Watts RMS x 1 at 1 Ohm and ≤ 1% THD+N

SPECIFICATIONS	PA400.1	PA600.1	PA1200.1
Dynamic Power Rating	800W x 1	1200W x 1	2400W x 1
@ 1 Ohm
RMS Continuous Power	400W x 1	600W x 1	1200W x 1
@ 1 Ohm1
RMS Continuous Power	300W x 1	400W x 1	800W x 1
@ 2 Ohms2
Frequency Response	20-250Hz	20-250Hz	20-250Hz
Damping Factor	150	150	150
Variable Low Pass	30-250Hz	30-250Hz	30-250Hz
Crossover 12dB slope
Subsonic Filter	Yes	Yes	Yes
Bass Boost	Yes	Yes	Yes
Input Impedance	20K	20K	20K
Input Sensitivity	150mV/7.5V	150mV/7.5V	150mV/7.5V
Output Load	1 ohm	1 ohm	1 ohm
Fusing	2 x 25A	2 x 30A	3 x 40A
Illuminated LED Driver	Yes	Yes	Yes
External Fan Driver	Yes	Yes	Yes
Pass Through RCA Jacks	Yes	Yes	Yes

1RMS continuous power driven into 1 Ohm from 20 to 250Hz @ 14.4VDC with lessthan 1% THD+N.

2 RMS continuous power driven into 2 Ohms from 20 to 250Hz @ 14.4VDC with lessthan 1% THD+N.

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