I've just finished installing a set of Polk SR6500's for my front speakers along with an Alpine PDX-4.150 amplifier in my 2006 Corvette and I'm in the process of trying to tune the system.
The rear speakers are currently still stock but will be replaced with a set of SR5250's soon.
I'm using my factory head unit with a PAC AOEM-GM24 adapter to send the low level signals to the amp.
The amp is fed straight off the battery using 4 gauge power and ground.
For some reason, I can't seem to set the high pass crossover below about 110hz without the speakers starting to overdrive with the dreaded 'blap' sound on bass notes when playing music any more than moderately loud.
The amplifier is rated at 150 watts X 4 and has no bass enhancements.
Can anyone think of a reason why I would have to set my high pass filter so high? I love the sound of system at low volume with a lower crossover point but the vette isn't the quietest car around when it's in motion so I do need more volume.
I'm not a Bass freak (There isn't even a subwoofer in the car yet). Most of my listening revolves around older rock and jazz.
Thanks for the help.