When install space is at a premium, but your sound system demands plenty of power to realize its full potential, Polk’s super-efficient D Series amplifiers are a very cool solution. All D Series amps offer an ultra-compact, minimalist design available in 4-channel and monoblock configurations, as well as a big gun 5-channel beast that enables you to drive all your speakers and a subwoofer. Toroidal transformers help keep the amplifier’s sleek aluminum extruded design under 2 inches tall while ensuring plenty of clean, efficient power. Low THD’s, high signal-to-noise ratios rated at full power, plus wide bandwidths, make the PA D Amplifiers your high-performance choice for clean, distortion-free sound.
The PA D4000.4 amplifier is capable of bridging two full-range channels into a single full-range channel with higher output power. For instance, one front and one rear channel will increase the output power from 125W per channel to 400W per channel (for a 4-ohm load). The most common hookups for the PA D4000.4 would be four full-range channels, two full-range channels, and a bridged sub, or two bridged subwoofers.
Low THD, a high signal-to-noise ratio, plus wide bandwidth frequencies make the PA D4000.4 four-channel a superior choice for distortion-free power
Super-efficient class D design—Runs much cooler than conventional amps
High-speed MOSFET—switching power supply
Toroidal transformers help keep the amplifier’s sleek design under 2-inch tall while ensuring plenty of clean, efficient power.
Super-Efficient Class D Design
Runs much cooler than conventional amps.
Help keep the amplifier’s sleek design under 2" tall while ensuring plenty of clean, efficient power
Thermal, DC offset, reverse DC voltage, and short circuit protection
Nickel-plated wire terminals & RCA connectors
Ensure maximum signal transfer
Front & rear level controls
Adjust the gain of the front and rear channels to match the output voltage from your head unit.
Low-pass & high-pass frequency controls
Enables you to adjust crossover overlap for better blending of speakers.
Front & rear BPF, FULL, HPF switches
Selects full range, high pass filter, or bandpass filter to dial in your speaker blending.
Channel mode switch (ST/4Ch)
In the stereo position, the amplifier will send the same signal to the front and rear channels.
Stainless steel hardware
Used throughout, it won’t corrode in humid environments
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