Caps CAN be used as a voltage filter BUT everything else must be up to par. To claim there is a huge difference would be nuts. Caps do not provide the long term backing of the electrical system because they will only recharge to what they are fed in a weak electrical system.
In my case, I have an upgraded alt, agm batt, and 2 runs of 1/0 to the back for 1000 watt class d sub amp and ~400 watt a/b amp for mids and highs.
I use an old Rockford fosgate bd1000a1 for subs and a boston acoustics gt40 for my mids. None of this is junk. I have done the big 3. My grounds are all connected directly to the frame. There is minimal resistance in my electrical system. If I'm listening to mp3's you can't tell the difference. They always sound slightly muddy. If I'm listening to a cd the sq is slightly diminished without my caps. I use all boston acoustics speakers.
I can understand why a lot of you think caps are pointless because you just get in and listen to your rap just to hear a long fart, get people's attention and hear skanky people lie to you about what they have, who they've slept with, who they want to kill, etc. You don't know what sound quality actually is.
To those of us who don't want a loud fart box but want to feel like we're immersed in the music, we can tell the difference between a properly regulated electrical system and an improperly regged one.
My midbass gets snappier with my 3 farads of ultra low esr electrolytic capacitance. My highs get less harsh, etc. I also, have 0 voltage drop. Now don't get me wrong, there is no HUGE difference and truthfully I could live without them. They DO help if properly implemented. They are not very expensive. If you know what you're doing they can be worthwhile. THat is the end of the story. They are not for everyone, but for the true audiophile they help out.
