Review on Mediabridge ULTRA Series Subwoofer Cable: 25 Ft Length, Dual Shielded, Gold Plated RCA Connectors - Black by Shannon Smith

First inspection of the goods, the quality is generally excellent, now the sound, after connecting to my subwoofer it hums, I have two subwoofers, pl 200 and polk psw10, I thought the problem is the amp of one subwoofer, plugged into another, same problem, changed cables and used my old cable and my own, and no hum, no hiss on both subwoofers, however you no longer use your subwoofer 25ft, hookup cable. I don't have time to request a refund or replacement from amazon.IE: My gear: Martin Logan Sequel II speakers, two Hafler power amps (two-channel amplification of my speakers), Hafler preamps, Polk SDA 2, Bose 901, both analog and digital music players IE: Vinyl, CDs and Amazon Music.