Amplifier Owner’s Manual
A | BALANCED DIFFERENTIAL INPUTS |
Provides maximum rejection of unwanted noise from upstream | |
| components. |
B | AUDIOPHILE NJM2068M |
Most mobile amplifiers today use the standard NJM4558 | |
| has a bandwidth of 3MHz, slew rate of 1V/uSec and noise level of 1.4uV. |
| The NJM2068M is simply a better performer with a bandwidth of 19MHz, |
| slew rate of 6V/uSec and noise level of .44uV. |
| The result is quieter, faster and wider bandwidth performance that |
| ensures the original music material is reproduced as accurately as |
| possible. |
| KEY FEATURES |
C | ULTRA HIGH SPEED IR CLASS D CHIPSET |
State of the art IR20957 chipset switches at more than 300kHz | |
| for blistering audio performance. All four or five chipsets are |
| sync’d together in unison to eliminate unwanted harmonics or |
| distortion. |
D | POST FILTER FEEDBACK |
Feedback is when part of the output signal is “fed back” into the | |
| original signal to ensure stability and accurate sound. Class D |
| amplifiers use output filters (see the 4 vertical coils below), but |
| most DO NOT INCLUDE these filters in the feedback loop. SD |
| amplifiers INCLUDE or take feedback after its passed through |
| these filters. The result is more accurate sound that rivals some |
| of the best class A/B amplifiers. |
C C C C
D D D D
A B
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E | ADAPT POWER MANAGEMENT SYSTEM |
| Full power output from 11 to 15 volts: ADAPT delivers the same output |
| power regardless of the vehicle’s electrical system voltage. Instantaneous or |
| long term voltage drops have no effect on the amplifier’s power output. This |
| means more dynamic and less distorted audio output. |
| Dual power modes provide maximum efficiency: ADAPT seamlessly |
| optimizes the power supply and Class D operating circuitry by adapting to |
| the end user’s listening habits. When the ADAPT circuit senses lower signal |
| levels, it will automatically optimize the amplifier’s power supply and Class |
| D circuitry to a low power mode that maximizes efficiency and minimizes |
| heat to almost zero. As a signal increase is detected the amplifier instantly |
| shifts into a high power mode, where the power supply and Class D sections |
| are now optimized to deliver massive power and headroom for those |
| demanding listening sessions. The amplifier is constantly monitoring and |
| adapting between these modes which results in higher overall efficiency, |
| much lower operating temperatures and rock solid reliability. |
F | THERMAL ROLLBACK CIRCUIT |
Under most conditions, SD amplifiers generate moderate | |
| to low heat. However, if extreme conditions exist, as |
| temperatures rise the amplifier will automatically adjust the |
| power output, so your music continues to play. These changes |
| are inaudible and vastly reduce the chance for any thermal |
| shutdown events. |
G | LOW EMI CIRCUIT BOARD DESIGN |
Most class D amplifiers can emit EMI noise that can cause | |
| problems with AM/FM reception or other devices in the |
| vehicle. SD amplifiers have undergone intense real world |
| engineering and testing to vastly reduce or eliminate these |
| issues. Careful PCB layout using four layers (most amplifiers |
| feature just two) along with many key filters ensures a very |
| low possibility of any interference issues. |
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