Well my system consist of db571's in all 4 doors, and an alpine mrp f300, well I got the 4 channel loc all connected and ready to go. so I ran my speaker wire up to the front behind the HU(factory) and spliced it to the existing factory wiring...now I only did one speaker so far because I have ran into this problem.

with the head unit cranked up i can barely hear the music from the speaker, I even faded it all the way to isolate that one speaker. the gain on the loc is all the way up and the amps is at normal. it sounds ok just quiet, when the HP filter is on, when i turn it off I sounds like **** when the bass hits...now i dont know if i need to mess with the amps crossover or what, im new to this stuff....could i have crassed the speaker wiring? does it matter if you flip polatiry?

 

Turn the high pass filter on, set it to around 100Hz. Turn the gain on the amplifier up until you have a desired volume level without distortion.

 

will the woofers still have some midbass?

 

Yes. Midbass region is generally between 80 and 300Hz, but without proper door treatments and some high powered larger speakers, you wont get good midbass response from the doors below ~100Hz which is why I recommended that crossover. Keep in mind that even though your crossover is set at 100, the speaker will still play frequencies below it but will slope off (depending how steep of a crossover slope is set with the amplifier's onboard crossover).

 

Without subs, you can't expect your door speakers to give you awesome low bass. Technically, the door speakers are too small to deliver decent audible frequencies below around 80hz. Like mSaLL500 said, set the switch to HP, somewhere around 100hz (the HPF in my HU is set to 80hz and I get no distortion at my desired above-normal listening levels). Either that or turn your headunit up just above where you would listen to it normally, turn your crossover down to where the distortion just begins to bother you, and you should be set (since you're tuning it above where you'd normally listen to it) or turn the crossover **** up a hair. Personally, that's how I would do it.