tweeter crossovers burn out?

Not usually the crossover that fails but the tweeter itself.  Thermal damage from overpowering.  The crossover is usually just a simple capacitor.

Can a crossover blow?  Yes, but it's highly unlikely that something in the crossover would fail before the tweeter does.  Being louder is not the sam as "picking up more frequencies."  What's the models of the speakers?  Have you checked your balance control?

They are alpine s series ..80 rms ... i have them hooked up to 4 channel amp.. there on channel 1 and 2 .. all agains are same.. and balance.. one picks up more voices etc... the others not as loud and sound more sharp..

if i turn bass up ..listening to the one thats louder..  with full bass  seems to sound fine.. dotn sound like theres bass trying to come threw.. but i dont know .. kinda stumped..

Got anthor ? ......say if a diffrent tweeter that has no crossover... would the highpass xover on the amp be enough to work on a tweeter freq.?

Alpine type s  says on box 240 watts 80 watt rms 

 this is amp im running..http://soundtoyzaudio.com/index.php?act=viewProd&productid=353

• 1200 watts, 4-channel amplifier
• Ultra slim 1-1/4" height for a compact installation
• Blue light illuminated right and left sides
• Blue light illuminated cooling fan
• Blue light illuminated terminals
• Tri-mode capable
• Remote bass control with 20ft. wire
• 2 ohms stereo stable, 4 ohms momo
• 4-channel bridgeable power amplifier
• high and low RCA inputs available by the switch of a button
• RCA preamp line output
• Selectable HPF/Full/LPF crossover:
  • HPF (High-Pass Filter): 40Hz - 250Hz
  • Full: 15Hz - 30kHz
  • LPF (Low-Pass Filter): 40Hz - 250Hz
• Adjustable input sensitivity: 0.2V - 6V
• Bass boost: 0-18 dB
• PWM MOSFET power supply
• Soft delayed remote turn-on
• Dual color indicator LED (Power and Protection)
• Dimensions: 12.87"W x 1.5"H x 14.17"L

OK, a couple of things, and you're probably not going to like some of it.  First off, that amplifier is genuine garbage, so what you're hearing may actually just be a bad amplifier channel or high distortion.  I assume you have the tweeters connected to their own channel, like channel 1 and 2?  If not, please explain your COMPLETE setup, including model numbers.  How did you set the gains on that amp?  Plus the HP crossovers on that amp are not sufficient to control tweeters by itself, you definitely need to use the passive crossovers that came with the tweeters or a separate electronic crossover if you want a full-active system.  But again, how do you have the system set up now and what else is in it?

Second you still haven't told me the model numbers of your tweeters, but you did say they came with a crossover.  I assume you used them and connected them per the installation instructions?  Describe what wire is going where...