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BOSS Audio PH4000D Phantom 4000-watts Monoblock Class D 1 Channel 1 Ohm Stable Amplifier with Remote Subwoofer Level Control (Discontinued by Manufacturer) (Discontinued by Manufacturer)

3.7 out of 5 stars 222 customer reviews

Currently unavailable.
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  • Amplifier Class: Class D
  • Technology: Digital
  • Number of Output Channels: 1
  • Total Power: 4000 Watts
  • Max Power @ 1 Ohm: 4000 Watts x 1
  • Max Power @ 2 Ohms: 3000 Watts x 1
  • Max Power @ 2 Ohms, when strapped with same model amplifier: 8000 Watts
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Back to School Essentials

Product description

Class D Topology

A class-D or switching amplifier is an electronic amplifier where all power devices (usually MOSFETs) are operated as binary switches. They are either fully on or fully off. Ideally, zero time is spent transitioning between those two states. In this way, power loss is significantly reduced, making a D class amplifier anywhere from 75% to 95% efficient. To maintain high efficiency, the filter is made with purely reactive components (inductors and capacitors), which store the excess energy until it is needed instead of converting some of it into heat. Some other advantages include reduction in size and weight, reduced power waste as heat dissipation and hence smaller (or no) heat sinks, and reduction in cost due to smaller heat sink and compact circuitry.

General Features

  • Thermal, overload, and speaker short protection
  • Soft turn-on circuit
  • Remote turn on / turn off circuit
  • input Voltage sensitivity selector
  • Gold plated RCA low level inputs
  • LED power and protection indicators
  • Black anodized heatsink
  • Nickel plated speaker and power terminals
MOSFET Power Supply

A Metal–Oxide–Semiconductor Field-Effect Transistor is a transistor used for amplifying or switching electronic signals, found in systems where information is processed or stored. We use them in our computers, telephones, game consoles, cars, electrical appliances, and, in this case, amplifiers. A MOSFET is basically an electrical switch with two possible states - on or off - that allows the flow of electrical current. The MOSFET performs its most important role in our D Class amplifiers by allowing or preventing the flow of power and creating an efficient amplifier.

1 Ohm Stable

The PH4000D is a one ohm stable amplifier which is able to continuously power loads of one ohm X one channel without encountering difficulties such as overheating. Almost all car amplifiers are at least four ohm stable and some are two ohm stable. One Ohm stable amplifiers are typically made to power up subwoofers that demand the heavier power load requirements to be able to perform the way they were made to perform.


Low Level Inputs With Pre-Amp Outputs
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Low Level Inputs With Pre-Amp Outputs

A low level input is measured in volts. It comes in the form of RCA (low level) outputs on the back of your head unit and goes to the RCA inputs on your amplifier (Right/Left). With that in mind, you can take control of more power by connecting more amplifiers together using the RCA pre-amp outputs (Right/Left) from your primary amplifier straight to the RCA inputs of a second or satellite amplifier (Right/Left).

Variable Subsonic Filter
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Variable Subsonic Filter

Subwoofers start to bottom out trying to reproduce low-frequency signals that are below their abilities to sound off. Bottoming out is more a mechanical problem and happens when the subwoofer driver reaches the limit of its excursion and creates a clacking or flapping sound instead of the low frequency entering its voice coils. If your sub is bottoming out, short of changing the driver into one that has better low-frequency handling, you can try the PH4000D, which has a subsonic filter to filter out frequencies below its specified low frequency limits.

Variable Crossover
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Variable Crossover

Subwoofers reproduce sound based low range frequencies. This process is called the crossover effect and occurs because the vast majority of audio systems cannot cover the entire spectrum sufficiently to minimize sound distortion and maintain an appropriate frequency ratio. In the case of our PH4000D amplifier, a variable crossover is offered so that you, the listener, can have the ability to set the frequency at which the crossover occurs, thereby setting precise sound specifications on your subwoofer.

Strapping Capable
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Strapping Capable

This sounds like exactly what you might be thinking. You are able to strap your PH4000D amplifier to another PH4000D amplifier and double the power that is being sent to your subwoofer(s). You now have the ability to connect more subwoofers to take advantage of the extra power.

Variable Bass Boost
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Variable Bass Boost

With the PH4000D amplifier you have Variable Bass Boost, which gives you control of exactly how much bass you want to pump out to your subwoofer(s).


Product information

Technical Details

Technical Specification

Warranty [pdf ]

Additional Information

Warranty & Support

Warranty, Parts:Parts
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Customer reviews

Top customer reviews

on July 10, 2014
Style: 3000-watt|Package Type: Standard Packaging|Verified Purchase
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on September 9, 2013
Style: 5000-watt|Package Type: Standard Packaging|Verified Purchase
0Comment| 3 people found this helpful. Was this review helpful to you?YesNoReport abuse
on February 23, 2015
Style: 4000-watt|Package Type: Standard Packaging|Verified Purchase
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on June 16, 2014
Style: 5000-watt|Package Type: Standard Packaging|Verified Purchase
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on June 19, 2017
Style: 4000-watt|Package Type: Standard Packaging|Verified Purchase
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on October 9, 2015
Style: 3000-watt|Package Type: Standard Packaging|Verified Purchase
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on December 11, 2012
Style: 5000-watt|Package Type: Standard Packaging|Verified Purchase
0Comment|Was this review helpful to you?YesNoReport abuse
on July 12, 2012
Style: 5000-watt|Package Type: Standard Packaging|Verified Purchase
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0Comment| 30 people found this helpful. Was this review helpful to you?YesNoReport abuse

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