The HK(688) Booster harness with LOC-X is designed to add an aftermarket amp to the 464w OEM Booster to power either a trunk sub or/and the OEM/aftermarket underseat woofers.
Please note that harness/LOC-X will not work if HK (688) Booster is defective/malfunctioning. No returns/exchanges/refunds due to defective OEM amp.
Warranty of harness and LOC-X is one year from purchase date. Harness kit is designed for experienced DIYers. Professional install suggested. Support limited to harness install; no support given to aftermarket parts not sold with harness kit.