KAC-X521 - Car amplifier KENWOOD - Free user manual and instructions
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| Product Type | 2-channel car amplifier |
| Brand | KENWOOD |
| Model | KAC-X521 |
| Dimensions (W × H × D) | 386 × 61 × 259.5 mm |
| Weight | 3.83 kg |
| Power Supply | 12 V DC (11-16 V possible), negative ground |
| Current Consumption | 37 A (1 kHz, 10 % THD, 4 Ω) |
| RMS Output Power (4 Ω, 2 channels) | 165 W × 2 (1.0 % THD+N) |
| RMS Output Power (2 Ω, 2 channels) | 254 W × 2 (1 kHz, 1.0 % THD+N) |
| Bridged Output Power (4 Ω) | 505 W × 1 (1.0 % THD+N) |
| Dynamic Power | 170 W |
| Signal-to-Noise Ratio | 81 dBA (CEA-2006, 4 Ω) |
| Input Sensitivity | 0.2 V (MAX) to 5.0 V (MIN) |
| Input Impedance | 10 kΩ |
| Low-Pass Filter (LPF) | 50 – 200 Hz, variable, 24 dB/oct |
| High-Pass Filter (HPF) | 50 – 200 Hz, variable, 12 dB/oct |
| Subsonic Filter (ISF) | 15 Hz, 24 dB/oct |
| Frequency Response | 5 Hz – 70 kHz (+0, -3 dB) |
| Protection Functions | Overheating (E-01), internal failure (E-02), speaker short-circuit (E-03), voltage out of range (VOLT flashing) |
| LX-Bus Connectivity | Up to 7 slave amplifiers, identification (ID 0-7) |
| Display | VOLT, CURR, TEMP, FAN (fan speed) |
| Cleaning | Wipe with a soft, dry cloth; do not use thinner or alcohol |
| Supplied Accessories | Self-tapping screws (4), assembly screws (4), cover, terminal cover, hex wrench |
Frequently Asked Questions - KAC-X521 KENWOOD
What is the output power of the KENWOOD KAC-X521 amplifier?
In stereo mode (4 Ω), the RMS power is 165 W × 2 (1% THD+N). In bridged mode (4 Ω), it reaches 505 W × 1.
What types of filters are built-in and how to adjust them?
The amplifier has a low-pass filter (LPF) and high-pass filter (HPF) adjustable from 50 to 200 Hz, as well as a fixed subsonic filter at 15 Hz. Use the LPF FREQUENCY and HPF FREQUENCY controls to adjust them.
What to do if the display shows 'E-01', 'E-02', or 'E-03'?
E-01 = internal overheating: turn off the unit and let it cool down. E-02 = internal failure with DC output: turn off and consult a dealer if the code persists. E-03 = speaker short circuit or ground contact: check the cables.
How to connect multiple KAC-X521 amplifiers together?
Use the LX-Bus function. Set the master amplifier to ID 0 and slaves to ID 1 to 7 (no duplicates). Connect the TO H/U terminal to the head unit and the REMOTE terminals to the slaves.
What is the minimum speaker impedance supported?
In stereo mode: 2 Ω minimum per channel. In bridged mode: 4 Ω minimum. Ensure the combined impedance does not drop below these values.
How to adjust the input sensitivity (INPUT SENSITIVITY)?
Turn the INPUT SENSITIVITY control to match the pre-out level of the head unit. The range is from 0.2 V (MAX) to 5.0 V (MIN). Refer to the head unit manual for the pre-out level.
Can I use this amplifier with a 12 V battery?
Yes, the unit operates on a 12 V DC source with negative ground. The operating voltage is 14.4 V nominal, but it accepts a range of 11 to 16 V.
How to clean the amplifier without damaging it?
Use a silicone cloth or a soft, dry cloth. Never use thinner, alcohol, or rough cloth that could scratch the surface or erase markings.
What to do if the fuse blows?
First disconnect the wiring harness. Check for any short circuits in the cables. Replace the fuse with a new one of the same rating (30 A × 2 for the KAC-X521). Never use a different value fuse.
How to use the separate amplifier control (AMP CONT)?
Set the AMP CONT switch to ON to allow sound control via the head unit. In the OFF position, the circuit is disconnected. The amplifier control is accessible even when power is off.
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