I have an KDC-MP435U receiver with 160w kenwood speakers. can you please advise for the the best speakers for this model? can I add a subwoofer? Please advise how can I improve my car sound. I'm using this receiver in a 1991 ZR-1 convertible corvette. Thank you in advance for your help.

Instruction Manual for Kenwood KDC-MP435U /KDC-X491 ftp://inform.kenwoodusa.com/...C-MP435U.pdf
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AMPLI-TUNER LECTEUR DE ... REPRODUCTOR DE DISCOS COMPACTOS RECEPTOR DE ... Take the time to read through this instruction manual. ... Record the serial number, found on the back of the unit, ... Register your Kenwood product ... Power Selecting the Source Volume Attenuator Audio Control ...

The wattage of the speaker is higher than the required wattage of the stereo. The stereo cannot drive the speaker very well. Use an amplifier if you want to have a loud sounds. Or if you already have sound set-up make sure that you have a capacitor for your amplifiers and fuses to support the power input to your stereo.

Kenwood cannot be unlocked without the code on line. This has to go to Kenwood or a radio de-coding company.
Sorry but at least you know.
Good luck with it, Dave

if there are no shorts in the speakers or speaker wires, then you probably have a bad output ic inside the radio.

check your speakers and speaker wires for shorts. if there are none try disconnecting power to the radio for a few minutes. if protect still comes on you may have a bad ouput ic.

it came with it when you bought it....or whoever sold it to you stole it if the original owner calls kenwood they willl work something out.

Jennifer, I have the same issue. the problem is that the 2007+ generations of Kenwood receivers are not compatible with the iPhone. You will need to get a 2009+ series in order to use your iPhone with the head unit. I had the same issue with the Kenwood KDC-MP435U in my mustang. I am going to get a newer head unit that supports the iPhone. You cannot do it with the MP435U.

1. your charging system is your only limitation for watts but you can add plenty without upgrading it. i'd say 1,000 watts max on the stock batter and alternator with large power and ground cables of at least 4 gauge.

2. yes. using your subwoofer rca outputs.

3. for a subwoofer you should always ad an amp. i'd say a 3-400 watt amp is fine to match up with you kenwood speakers. you will need a small sub to fit in there or maybe one slim enclosure behind each seat with slim 8" subs

http://inform3.kenwoodusa.com/manuals/KDC-MP435U.pdf

Page 28 says that a shorted speaker wire could cause this.