Asymmetrical Design: The Kenwood X450-4 is basically two
different size amps built into one chassis, both full-range and 2-channel. Amp
A is 60 watts x 2 and amp B is 100 watts x 2. Amp B is also bridgeable to 300
watts x 1, so it can be used to power a subwoofer.
CEA-2006 Compliant: CEA-2006 is a system of testing and
measurement methods for mobile audio amplifiers. 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 4-ohm load, with 1% or
less Total Harmonic Distortion plus noise (THD+N), and over a frequency range of
20 Hz to 20 kHz (when applicable). Signal-to-Noise ratio is measured in weighted
absolute decibels (dBA) at a reference of 1 watt into 4 ohms. CEA-2006 allows
consumers to compare car amplifiers and receivers on an equal basis. Using
CEA-2006 criteria, the X450-4 is rated at 60 watts RMS x 2 plus 100
watts RMS x 2 with an 80 dBA signal to noise ratio.
Specifications: The manual also lists these non CEA-2006
- A Channels: 75 watts x 2-channels (into
2Ω, at 1 kHz, no more than 0.5% THD)
- B Channels:
- 2Ω: 100 watts x 2 (at
1 kHz, no more than 0.5% THD)
- Bridged: 300 watts x 1 (into
4Ω, at 1 kHz, no more than 1% THD)
- Signal to Noise Ratio: 100 dB (at rated
Cooling Fan: There is a cooling fan to help dissipate heat
and ensure cool, reliable operation. Make sure not to block the vents or the fan
when installing the amplifier.
Input Sensitivity: The X450-4 features independent gain controls
for the A and B channels. The input sensitivity of each is adjustable from 200 mV to
A Channel Crossover: The A channels have a switch to set the
built-in crossover to high-pass or off (full-range). The high-pass crossover point
is adjustable from 50-200 Hz and the crossover slope is 12 dB/octave.
B Channel Crossover: The B channels have a switch to set the
built-in crossover to low-pass, off (full-range), or high-pass. The crossover point
is adjustable from 50-200 Hz. The crossover slopes are 24 dB/octave for low-pass and
12 dB/octave for high-pass.
Bass Boost: The B channels have a bass boost circuit centered
at 40 Hz; boost is variable from 0 to +18 dB.
Input Selector: The signal for the A and B amplifier channels
can be supplied from separate inputs (two pair of stereo RCAs), or from just the A
channel inputs (stereo RCAs); set the switch to AB or A.
Aluminum Heat Sink: The aluminum heat sink increases the
amplifier's heat dissipation efficiency, increasing the life of the amplifier.
Power And Ground Terminals: The amplifier features screw
terminals for power and ground. They will accommodate spade connectors up to
Remote Turn-On Terminal: The remote turn-on is a screw
terminal that will accommodate a spade connector up to 0.35" wide.
Speaker Terminals: The four pair of speaker outputs are
screw terminals and will accommodate spade connectors up to 0.35" wide.
Signal Inputs: The amplifier features two pair of RCA input
connections, A and B.
Fuses: Two 40-amp ATO fuses are installed in the amplifier
Warranty Note: This refurbished Kenwood product carries a 90-day warranty
when purchased from Crutchfield. Kenwood offers Crutchfield customers an extra
60 days extended warranty beyond the 30-day Kenwood Limited Warranty for
Refurbished Product that comes in the box.
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