hpf fixed at 80 hz

I have a kenwood 4x500 amp, I use 2 of the(lpf) channels bridged for my components I would like to use the hpf channels for my new tang band 3" drivers but the hpf is fixed at 80 hz is this to low of a freq. for those speakers. I beleive i need to be above 500hz for this to be ok.the amp puts out 40 watts rms per channel.any input?-A vision without a plan is just a hallucination-

Does your radio have built in crossovers?

yes it has 3 seperate c/overs bass, mid,treble. treble can be adjusted from 7.5 khz to 15 khz. mid is set at 700hz and bass is set at 80hz but can be adjusted-A vision without a plan is just a hallucination-

That is an equalizer, with adjustable center frequencies. The crossover is labeled HPF just as it is on the amp.

sorry!!! then no it does not have one.-A vision without a plan is just a hallucination-

You do have several options, but unfortunately, they all include new equipment.  Either an amp with an adjustable crossover, a new radio with a built in crossover.  that you can set as a 3 way crossover (this will not be a cheap radio)  Or a stand alone 2 or 3 way electronic crossover.  Probably the cheapest route.

I down loaded the operating manual and it does have a built in crossover with hpf sorry about that-A vision without a plan is just a hallucination-

The only thing you need to check is to see if it has separate crossover points for front and rear.    Do you have any other speakers in the same area to cover the below 500Hz range?

yes it does have front rear crossover points and I have 6.5 components in the doors and a set 0f 12s for the lows, the 3s would be in my dash.-A vision without a plan is just a hallucination-

You will have to use the rear channels of the radio to feed signal to the channels that are connected to the components.  I think I read you have them bridged on the amp.  You will get much better sound if you wire them in stereo.   Set that crossover to 80 or 120.   Then you will have to connect the radio's front channels to the channels of the amp that are connected to the 3.5s and set the crossover to the higher frequency.