Top 20 Kenwood Excelon KAC-X521 Car Audio Amplifier Questions & Answers

its a decently old amp i would replace amp. the capacitors are probly going bad kenwood is notoryesly bad for that

Kenwood Excelon... | 143 views | 0 helpful votes

If disconnecting all power wires, and replacing all fuses (including inline ones) doesnt reset it. then its toast. Hate to break it to you :( Contact the manufacturer if you feel it is under warranty.

Kenwood Excelon... | 146 views | 0 helpful votes

2 things could shut your low of a ohm load, or very low voltage drops. I need some more info to help you out.
1. Is the amp really hot when it shuts off?
2. Is it a mono sub amp or 2 channel stereo amp?
3.What ohm's are your subs & are they SVC or DVC?
4. How do you have them wired to the amp?
You can email me at I have a idea whats going on just need some more info.

Kenwood Excelon... | 155 views | 0 helpful votes

Red lights and error codes usually mean a fault ha occurred. Usually blown output transistors or input power supply caps are to blame. Don't try to fix unless you are comfortable with doing that and have the equipment. Also try emailing Kenwood tech support, they will be happy to tell you exactly what the error code is and possibly why it is happening.

Kenwood Excelon... | 377 views | 0 helpful votes

Hello mogly20,

The amp probably won't know if it's you or the homeless guy, so try smashing a glass bottle on it like he did. If that doesn't work, I'd recommend you locate another homeless guy and buy another amp.

Hope this helps.

Kenwood Excelon... | 839 views | 3 helpful votes

check speaker and power source

Kenwood Excelon... | 359 views | 0 helpful votes

check your remote connection

Kenwood Excelon... | 168 views | 0 helpful votes

low voltage check power source

Kenwood Excelon... | 285 views | 0 helpful votes

bad speaker connection or rca check them

Kenwood Excelon... | 197 views | 0 helpful votes

I do believe this is caused by one of your amp fuses. Depending on which + on the amp is being used. That channel has a blown fuse. have you tried running + and -, + and - to both channels to see if both subs worked? If one sub doesn't then it's a blown fuse or scarred fuse and needs to be changed.

Kenwood Excelon... | 771 views | 0 helpful votes

check ground, most amps required that you ground straight from the batt. also check your rca jacks

Kenwood Excelon... | 237 views | 0 helpful votes

wireing an amp can be tough it starts from the e.q.the e.q. must have a sub out.

Kenwood Excelon... | 85 views | 0 helpful votes

According to page 7 of the radio's manual, E-02 means the amp has failed and DC is being applied to the speakers. It also says "Turn the POWER switch "OFF" and release the protection."

Kenwood Excelon... | 455 views | 0 helpful votes

you probably blew it up. Whenever you smell that smell it is almost always a capacitor in there that blew.

Kenwood Excelon... | 97 views | 0 helpful votes

I think there is a switch to go from output 3+4 to subwoofer

Kenwood Car... | 20 views | 0 helpful votes

Page 13 says it is activated by the user. It tells you to treasure the code. Ask the last user. Take it to a Kenwood Service centre. Try a reset as shown on Page 3 of the manual.

Kenwood Car... | 26 views | 0 helpful votes

Your Kenwood has a component or wiring fault that has to be corrected before normal operation can resume.

Kenwood Car... | 19 views | 0 helpful votes

Make sure ground and power to the AMP are perfect (clean and tight). Afterwards unplug all the speaker wires and/or RCA speaker connections. Does the light still flash and power down after it is reset? If so, the AMP may be damaged. If not, then one of your speaker wires are shorted. Plug one speaker in at a time. One of them should cause a negative reaction.

Kenwood Car... | 19 views | 0 helpful votes

Typically those car radios have an embedded (on circuit board) chip which is a flash EEPROM type memory. And this chip stores data which was programmed even if power is removed to the system. It also cannot easily be erased. They engineer this on purpose because any workaround to there anti theft system would defeat the purpose of having it so. Um I'm 99% certain without that code you basically have a brick which won't power on. And nothing you can do can change that. Perhaps and engineer or something could replace the chip or I have heard of ways to wire in and basically short certain leads causing the chip to delete it's memory without actually destroying it but that is engineer level stuff. Buyer beware I would definitely get a refund on that. A quick Google search of Kenwood 6140 password comes up with this to confirm what I already know about this technology. Also with 4 digits there are 10000 different combinations.

Kenwood Car... | 44 views | 0 helpful votes

Not finding what you are looking for?
Kenwood Excelon KAC-X521 Car Audio Amplifier Logo

19 questions posted

Ask a Question

Usually answered in minutes!

Top Kenwood Car Audio & Video Experts


Level 3 Expert

85222 Answers

Jeffrey Turcotte
Jeffrey Turcotte

Level 3 Expert

8984 Answers

The Knight
The Knight

Level 3 Expert

76204 Answers

Are you a Kenwood Car Audio and Video Expert? Answer questions, earn points and help others

Answer questions

Manuals & User Guides

View Most Popular

Kenwood Car Audio & Video

  • Kenwood Car Audio & Video

Most Popular Question

kenwood excelon kac x811d blinking e 03

  • Car Audio & Video