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.
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.