• Lower the gain adjustments on the amplifier and adjust the EQ on your audio or mobile device (if equipped)• Connect the ground wire to the closest available spot. Connect it to the frame (where paint is removed) as close to the amp and/or controller as possible. The longer the ground wire, the more chance of noise interference.• Check that the positive round (+) and negative squared (-) speaker wires are connected to the correct positive (+) and negative (-) connection on the amp.  If these are not connected properly, the speaker will be "out of phase," and result in audio oddities. Although this is not dangerous to a speaker or amplifier, proper power delivery and speaker response is not possible with reversed speaker wires.• Check where the wire goes in to the speaker housing stem that there is no exposed wire causing a short.  If so, please contact us for warranty repair.• If you have a whining noise through the speakers when revving the engine, please contact us to request a free noise filter.• Check that the 3.5mm to RCA cable does not have a short causing static or other interferance.  To check it, wiggle it around where it is connected to the amplifier and audio device/Bluetooth controller.  If there is feedback or static when moving the cable, request a replacement from us under warranty.