Check the listing for details. OPTION High-Low Adapter Set For P&P Cinch Converter For Power Quad Lock HLM. Condition: New. Listed at 262.48 USD. The integration of car hifi components into existing original sound systems is becoming increasingly complex due to intelligent radio diagnostic systems and the lack of preamplifier outputs on the factory radio. With the HLM-SUB-QUADLOCK, an active subwoofer can easily be retrofitted to a Quadlock connection. Please use the eBay checkout process. All necessary information and payment options are displayed in this process. You will also receive an order confirmation separately by email. There you will also find all the relevant information about your purchase. If you have any problems with this, just give us a call! We will inform you as soon as we have received your payment and we have handed over your goods to DHL. You will also receive the tracking number in a separate email directly fr.