Hi, I've been having a problem with my setup and any information would be appreciated.
I have a basic setup, aftermarket head unit, amp and sub in my '02 Grand Am SE. I like to listen to dubstep and trance music mainly. The dubstep sounds great with the heavy low notes, but with dubstep and trance with some higher bass notes (more in the 80hz range) the volume from the sub just plummits. Its really jarring when a song plays a range of bass and when the bass is down in the 40-50hz range it hits really hard and then when the bass goes a little higher to 70-80hz the volume just plummits. I'm more of an SQ guy than a SPL guy so this continues to bug me.
And this is not a crossover issue as I have thoroughly checked those. HU is set at 100hz and amp is set at max 250hz (since the head unit is at 100).
Amp:Kicker DX1000 - 1000w Mono, 500rms at 4ohms
Sub:Rockford Fosgate Punch P3 10" 1000w (500rms) wired at 4 ohms in a sealed box
I've used a climbing test tone scale (from 40hz to 200hz, at 10hz increments) to confirm the volume drop as hz go up and the volume drops slightly at 60hz and drops really fast after that until 80hz where the volume from the sub is only slightly less then my car speakers until 100hz (the crossover) and then it starts to drop from there (like it should).
I originally had a 4 channel lanzar amp 2000w, but tried the kicker amp thinking it was the amp causing this phenomenon. It did not fix the problem, but the kicker amp sounded WAY better and ran cooler than the cheap lanzar one so I kept it. I even tried hooking up my brothers kenwood HU thinking it was the HU, but still the same phenomenon. Lastly the box I had was .85 cu ft volume and the sub recommend .5-.7 so I got a .7 box thinking that might fix it, but no I still have the same problem. The only thing left that I haven't replaced/swapped is the sub. I figured since it was a rockford sub it would be high quality and that it wouldn't have been the problem (not saying you can't get a lemon every once in a while). The only thing is I used to have a cheap 500w sony sub in my car a long time ago (before the rockford one) and I seem to recall this same phenomenon back then. It just wasn't as jarring because it wasn't as loud as my 1000w RF sub. The RF sub sounds great below 60hz and hits really hard otherwise. I even tried wiring it at 2 ohms just to test and it had no effect. So I've technically tried selectively replacing/swapping out every component in my system to find the culprit and the problem still persists regardless. Everything else about my audio system works fine, I've had absolutely no other issues.
Can car subs just not play 60-80 hz (seems unlikely)? Is it my car? I've heard things about cabin gain in small cars. Is it just that car is small and it makes the lower hz sound LOUDER than the 80hz and thats what I'm noticing or is there something else that I'm missing here. I'm just picky about sound quality and don't like the volume difference when I know the songs don't sound like that when listen to them at home on nice headphones or my home theater system. Any help/input would be appreciated, thanks.