This replacement bass knob is the perfect solution for effortless adjustment of amplifier levels, particularly when the units are positioned out of reach. While it is completely compatible with the Skar Audio amplifiers detailed below, it also possesses universal capabilities, making it adaptable to many other amplifier brands. Should your amplifier require an RJ11 style wire (6-Pins) for a bass knob connection, this product should suit your needs. However, we can only guarantee compatibility when used with Skar Audio amplifiers. Compatible with the SKv1-800.1D, SKv1-1200.1D, SKv1-1500.1D, SKv1-2500.1D, SKv1-3500.1D, SKv1-4500.1D, RP-3500.1D and RP-4500.1D.