Have you contacted Arc? They might fix it if you send it in. I had a Sundown amp with an RCA connector issue and sent it to them to be fixed. Didn't take very long and was cost was reasonable.
My Current: 2010 Black Sapphire Metallic 335i /Sport/DCT/PDC/Nav/Black Leather/CF Wrapped Interior/Gloss Black Grill/ JB+ / 360 Forged Mesh 8 19" / BMW Performance Rep Trunk Spoiler / More coming...
My Other: 2006 Audi A4- Sold