STEG MA32A Amplifier Bass Boost (0 to 6dB):

Bass Boost (0 to 6dB): Gives you the flexibility to dial in that extra "thump" when the mood strikes

This type of unit is designed for full system upgrades where quality

and crisp highs

The AWAVE V13 PRO is a compact under-seat powered subwoofer / amplifier unit designed to enhance low-frequency performance in car audio systems without the bulk of a traditional boxed subwoofer

or mids and subs together

STEG MA32A Amplifier Bass Boost (0 to 6dB):Quality replacement of original tweeters for owners of Audi A4, A6, A8. They offer a cleaner and more accurate sound full of enjoyment. Price for 1 pair set! Type: Tweeters Plug & Play (very simple and quick replacement!) Heights: Membrane: Silk Frequency range: 1500 22000 Hz