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Big bass out of this tiny all-weather amp

Any basshead will tell you that big power is key to great sound, but sometimes you just don't have much space in your boat or off-road vehicle for a big amp. Kenwood's Excelon XM502-1 mono subwoofer amplifier can send up to 500 watts RMS to your subwoofer, and it'll fit almost anywhere in your vehicle. A precise low-pass filter lets you optimize the sound for your sub, while the built-in bass boost lets you dial in just the right amount of thump. The subsonic filter removes ultra-low bass so that your amp and subs can operate more efficiently. An optional wired remote lets you control your sub's level from the driver's seat.

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Big bass out of this tiny all-weather amp

Convenient weather-proof technology

Conformal coating protects the internal circuits from water and dirt, so the show will always go on, even through the roughest conditions on road, trail, or waterway. Class D technology ensures that this compact amp will run cool and perform reliably. The amp accepts input signals from a receiver's RCA outputs or speaker wiring, so it'll work with almost any audio system. If you do use the speaker-level inputs, the amp can sense the signal and turn itself on, so you won't need to run a separate remote turn-on lead to the receiver or fuse box.

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Product highlights:

mono subwoofer powersports/marine amplifier
- 300 watts RMS x 1 at 4 ohms
- 500 watts RMS x 1 at 2 ohms
Class-D amplifier design
variable low-pass filter (50-200 Hz, 24 dB/octave)
bass boost (0-18 dB at 40 Hz)
subsonic filter (25 Hz, 24 dB per octave)
optional wired remote control available

More Info:

conformal-coated circuit boards — suitable for powersports and marine applications
preamp and speaker-level inputs
- high-level inputs handle up to 5V (about 6 watts)
wiring and hardware not included with amplifier
- 8-gauge power and ground leads recommended
fuse rating: 30A x 2
8.394"W x 2.1"H x 5.95"D
warranty: 90 days
MFR # XM502-1 (REF)

What's in the box:

Refurbished mono supwoofer amplifier
Two 30-amp ATC fuses (installed)
Terminal cover (installed)
Control panel cover (installed)
2 RCA input covers (installed)
Speaker level input port cover (installed)
Wired remote control port cover (installed)
7" Speaker level input harness
Four 5/8" Screws
Instruction manual (English/ French/ Spanish)

Scratch & Dent items may be missing non-essential accessories. In some cases the manufacturer's accessories have been replaced with generic equivalents.

See the difference between "Open Box" and "Scratch & Dent" Outlet items

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Researched by Crutchfield's Mark G.

Features & specs

Performance
RMS Power Output (Watts x Channels)	300 x 1
Frequency Response at Rated RMS Power	20-200 Hz
THD at Rated RMS Power	1%
Signal to Noise Ratio	85 dB
Input Voltage	14.4v
Peak Power Output (Watts x Channels)	1000 x 1
Power at 2 Ohms (Watts x Channels)	500 x 1
Bridged Power (Watts x Channels)	N/A
Minimum Impedance Bridged	N/A
Minimum Impedance Unbridged	2
Features
Amplifier Class	D
Low-Pass Crossover Frequency	50-200 Hz
Low-Pass Slope (dB/octave)	24 dB/octave
High-Pass Crossover Frequency	N/A
High-Pass Slope (dB/octave)	N/A
Bass Boost	0-18 dB
Bass Boost Frequency	40 Hz
Fan Cooled	No
Fuse Rating	60
Speaker Level Inputs	Yes
Preamp Outputs	No
Height (inches)	2-1/8
Width (inches)	8-7/16
Depth (inches)	6
Parts Warranty	90 Days
Labor Warranty	90 Days

Product Research

Features

CTA-2006 Compliant: CTA-2006 is a system of testing and measurement for mobile audio amplifiers. This voluntary standard advocates a uniform method for measuring 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 over a frequency range of 20 Hz to 20 kHz (for full range amplifiers) with 1% or less Total Harmonic Distortion plus noise (THD+N). Signal-to-Noise ratio is measured in weighted absolute decibels (dBA) at a reference of 1 watt into 4Ω. CTA-2006 standards allow consumers to compare amplifiers and receivers under the same conditions (apples to apples).

CTA-2006 Specifications:

Power Output: 300 watts RMS x 1 (20-200 Hz) into 4Ω
Signal to Noise Ratio: 85 dBA (measured at 1 watt into 4Ω)

Other Specifications: (not using the CTA-2006 criteria)

Power Output: 500 watts RMS x 1 (100 Hz, 14.4 volts, ≤1.0% THD)
Signal to Noise Ratio: 100 dB (at rated power output)

Class D Amplifier Design: The amplifier design is Class D, which uses digital switching power supplies. The result is a more efficient amplifier, generating less heat than Class AB amps of equal power. The Class D design also allows the amplifier to be built on a small chassis, and installed where space is limited.

Signal Sensing: The amplifier has a signal-sensing turn-on circuit on the speaker level input. When a signal (up to 50 watts) is detected on the speaker level inputs, the amplifier will automatically power on. When the signal is no longer detected, the amp will turn off. This allows you to install the amplifier without a remote turn-on lead if the speaker level input is used.

Controls:

Input Sensitivity: The Input Sensitivity control lets you match the amplifier input to the preamp output level of the source unit. The rotary control lets you adjust the sensitivity between 200mV (0.2V) and 5V, with markings at 0.2V, 0.3V, 0.5V, 1V, 2V, 3V, 4V, and 5V.
Crossover: The low-pass crossover is always active (cannot be bypassed). The crossover slope is 24dB per octave and the crossover point is continuously variable from 50 Hz to 200 Hz.
Bass Boost: The Bass Boost increases the signal centered at 40Hz. The rotary control lets you adjust the boost between 0dB and 18 dB.
Infrasonic Filter: The infrasonic filter can be turned on or off, as desired. The filter slope is 24dB per octave at 25 Hz.

Connections:

Line In: The XM502-1 has one pair of line level RCA inputs. The amp will accept a signal between 200mV and 5V.
Power/Ground/Remote Turn-on: The amplifier has screw terminals for the power, ground, and remote turn-on, and will accommodate spade connectors. The power and ground terminals are 0.55" wide and the remote turn-on terminal is 0.34" wide.
Speaker Output: One pair of screw terminals is provided for connecting the subwoofer. Both terminals are 0.34" wide, and accommodate spade connectors. The amplifier is designed for a 4Ω load, but can handle a 2Ω load.
Speaker Level Input: When an RCA line level signal is not available, use the included 7" speaker level input harness (2-channel).
Fuses: Two 30-amp ATC fuses are installed in the amplifier. With the 60-amp fuse rating, an 8-gauge amplifier wiring kit is recommended with a 60-amp (minimum) fuse installed next to the battery.
Remote: The RJ-14 connection is for the optional KCA-RC01A wired remote control (item number 113RC01A, sold separately), allowing output level adjustment from the front of your vehicle. The remote is not waterproof.
Input Covers: The RCA and speaker level inputs have covers installed; you should leave the cover in place for the unused inputs.

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