Don't bother with trying to remove the bass from your interior speakers. Just add the sub and amp.
You may not want to spend the money but adding a small four channel amp, even with your stock h/u and speakers, will make a huge difference in sound.
GhettoSQ said:You said you already tried the sub without crossing over the factory speakers -- what frequency is the low-pass filter on the sub? If it's 6db/oct at 80Hz the 150Hz bass blockers should match nicely, the frequency overlap will be at lower decibels and therefore end up closer to flat response.
I'm not sure exacly, but I'm guessing it's 80 hz at leat 12dB/oct. (there is only an on/off switch)
With the large amount of cabin gain in a car I am sure you arn't missing as much as you think you are.
How did you set the gain level on the sub amp?
Have you currently bottomed out your interior speakers?
The first thing you want to do is find out for sure -- it might be as high as 300 or 500 Hz, our ears might not know the difference. What kind is it? Does it come with a manual?
I will be building a new LP filter to go with the rest of the system, and possibly a new amp too, so the cutoff will be whatever I will need.