Our Product Research Team
At Crutchfield, you'll get detailed, accurate information that's hard to find elsewhere.
That's because we have our own in-house Product Research team — they open the box,
verify contents, check the owner's manual, and record dimensions, features and specs.
We stay on top of new products and technologies to help people make informed choices.
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-8500M
under CEA-2006 regulations is rated at 300 watts RMS x 1 channel with a 54 dBA signal to noise ratio.
Also following CEA-2006 guidelines, the 2Ω power rating is 600 watts RMS.
Mono-Power Amp Design:
The Pioneer GM-8500M is designed with specific
features to power your subwoofers with a frequency range between 10-240 Hz.
amplifier is not designed to power a full-range speaker.
Class-D Amp: The superior efficiency of a Class-D amplifier
means higher power output and greater compactness than an analog amplifier
offers. Class-D amplifiers overcome the inefficiencies of traditional Class-A or
AB amplifiers. Pioneer's Class-D amps transform very little power into heat so a
higher percentage of the power supply (67%) is transformed into the load. This
results in a very compact amp which needs less input power to produce very high
Pulse Width Modulator (PWM): The Class-D amplifier's PWM (Pulse Width
Modulator) modulates the original audio input signal with a triangulated signal
wave which has a much higher fixed frequency. The result is a digital signal
which contains both the input signal and a band of frequency components around
the modulation frequency. A LPF (Low Pass Filter) then filters out the high
frequency pulses and the resulting amplified output signal is then sent to the
subwoofer and/or speakers.
2-Ohm Stable: The Pioneer mono-amplifier is capable of handling load
impedances down to 2Ω. The amplifier is rated at 600 watts RMS x 1 channel into
2Ω with <1% THD+N.
Gain: Rotary control used to set the amplifier's gain
according the level of the incoming signal and continuously variable from 0.2V
Low-Pass Crossover: Built into the GM-D8500M is a very smart
crossover network. It works like a gateway, routing the big bass signals
(adjustable from 40 to 240Hz or lower, at -12dB/octave) and filtering out
higher-frequency signals to that subwoofer. This optimizes your system's
efficiency and delivers the best possible sound quality.
Note: The crossover cannot be bypassed.
Bass Boost: For added low
frequency performance this amplifier has a bass boost circuit, variable from 0
to +12 dB and centered at 50 Hz. Adjustment is made using the included wired
remote. Bass boost gives you more control over how your music sounds. It lets
you set the optimal bass level for each subwoofer connected to the GM-D8500M, so
the tone controls from your headunit can do what they do best.
Remote Bass Boost: The bass boost circuit is controlled using the
included wired remote (YXC5142), which can be mounted within easy reach of the driver.
It's helpful when adjusting bass output between different music sources or
songs. The remote has integrated flanges on either side to mount the unit under
the dash. The remote control measures 2.3125" wide
x 1.1875" tall x 2.5" deep.
Power Connections: The power and ground connections will accommodate up
to 4-gauge wire. The remote turn-on terminal will accept up
to 8-gauge wire. A phillips-head or straight-head screwdriver can be used to tighten
Speaker Level Input: A
speaker level to RCA adapter is included; splice your radio's speaker output to
the adapter, then plug it into the RCA inputs on the amp. The input switch on
the amp should be set to SP (speaker level) or RCA (line level) to match the
radio output level.
Speaker Connections: The speaker output terminals will accommodate up to 8-gauge wire. A
phillips-head or straight-head screwdriver can be used to tighten and loosen