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CEA-2006 Compliant: CEA-2006 is a system of testing & measurement
methods for mobile audio amplifiers; both stand-alone amps and those built into
head units. This voluntary standard advocates a uniform
method for determining an amplifier's RMS power output and signal-to-noise
ratio. The criteria for measuring power uses a DC input voltage of 14.4 volts
and the RMS power output is measured into a 4Ω load, with 1% or less Total
Harmonic Distortion plus noise (THD+N), at the stated frequency range for the
amplifier (20 Hz to 240 Hz in this case). Signal-to-Noise ratio is measured in weighted absolute
decibels (dBA) at a reference of 1 watt into 4Ω. CEA-2006 allows consumers
to compare car amplifiers and receivers on an equal basis. The Pioneer GM-7400M
under CEA-2006 regulations is rated at 200 watts RMS x 1 channel with a 72 dBA signal-to-noise ratio.
Also following CEA-2006 guidelines, the 2Ω power rating is 400 watts RMS
Class D Amplifier: The GM-D7500M is a Class D Digital
amplifier, which provides higher output power in a smaller package than a
traditional analog amplifier. This Class D amp has a very efficient power
supply, turning a lower percentage of the power into heat and more into the
actual load. The amp's PWM (pulse-width modulator) modulates the original audio
input signal with a triangulated signal wave which has a much higher fixed
frequency. The resulting digital signal contains both the input signal and a
band of frequency components around the modulation frequency. The Low Pass
Filter (LPF) filters out the high frequency pulses, leaving the amplified output
signal to be sent to the speakers.
2-Ohm Stable: The Pioneer mono amplifier is capable of handling load
impedances down to 2Ω. The amplifier is rated at 400 watts RMS x 1 channel into
2Ω with <1% THD+N.
Low-Pass Filter (LPF): The amplifier's internal low-pass
filter is continuously variable from 40 to 240Hz with a slope of 12dB/octave.
The filter can be turned on or off using a two-way switch.
Bass Boost: For added low
frequency performance, this amplifier has a bass boost circuit centered at 50 Hz. The
amount of boost is selectable at 0
dB, +6 dB, and +12 dB using a three-way switch.
Power Connections: The power
and ground connections are screw terminals that will accommodate up
to 4-gauge wire. The remote turn-on set screw terminal will accept up
to 8-gauge wire. A slotted or Phillips head screwdriver (not included) is required to tighten/loosen
Speaker Level Input: A speaker level-to-RCA adapter is
included, allowing you to splice your radio's speaker wires to the adapter, then
plug it into the RCA inputs on the amp. The amplifier automatically detects the
type of signal being input, therefore, there is no input switch to set. In many
cases, the amplifier will automatically turn on when a speaker-level input
signal is detected, and will turn on or off when the head unit is turned on or
off. In cases where the amplifier does not turn on automatically, the system
remote control wire should be connected to the amp to turn it on and off.
Input Sensitivity: The amp will accept RCA input signals
between 200mV and 6.5V, and a speaker-level input signal between 0.8V and 10V.
Speaker Connections: The
speaker output terminals are also screw terminals, and will accommodate up to
8-gauge wire. A slotted or Phillips head screwdriver is required to tighten/loosen the terminals.
- Power Output (at 14.4 volts):
- 200 W x 1 RMS (4Ω, 20Hz-240Hz)
- 400 W x 1 RMS (2Ω, 50Hz)
- 400 W x 1 Maximum (4Ω)
- 800 W x 1 Maximum (2Ω)
- Current Consumption:
- Continuous: 18A (4Ω)
- Average Current Draw: 5.2A (4Ω), 10.3A (2Ω)
- Best Frequency Response: 10Hz to 30kHz (+0dB, -3dB)
- Signal-to-Noise Ratio:
- 95 dB (IHF-A network)
- 72 dBa (CEA-2006 spec, 1 W into 4Ω)
- Distortion: 0.03% (10W, 100Hz)