My favorite part of my audio upgrade was replacing those so called teeters with actual ones that can do the highs.
Below is my complete audio build for reference, excluding the head unit which is garbage, everything else is excellent.
Alpine INA-W900BT +KCE-400BT
JL 13TW5 Wicked CAS Enclosure with Trunk Mat
Hertz High Energy Components HSK 165
Alpine PDX-F4 4 Channel amplifier 4x100W
Rockfordfosgate R750-1D 750W Mono Amp
Rearview Camera Pyle PLCM18BC
The huge stock tweeter just can't output high frequencies.
