vibe audio

Fitted the vibe t6 kit last week, and honestly, they sound worse then the oem ones. They're run through the vibe inline amp, and I cant seem to get any bass out of them. Everything is correctly wired in. Any adivce?

Audio Upgrade Stage-2 - Vibe Micro Amplifier Plug & Play - How I Done It - ************** . Audio Upgrade Stage-1 . . . . Blam Relax 200rs Speakers From Skipton. . Audio Upgrade Stage-2 - Vibe Micro Amplifier Plug & Play - How I Done It - . Audio Upgrade Stage-3 - Vibe Micro Sub Amp + Jbl Sub -...