Kenwood KAC9102D Support Question
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Question posted by nathanraycraft on February 18th, 2013
The Two Little Swtches On The Bottom Right Front Of My Amp. I Think One Of Them
Current Answers
Answer #1: Posted by quaff on February 19th, 2013 10:17 AM
The left switch is labeled "ISF". This is an Infrasonic filter switch. In brief, even sub-woofers can have issues replicating certain sounds below ~15Hz-25Hz or so. In an attempt to recreate these low frequencies it can start making odd sounds, distortion, or conflicting waves which might lead to phasing or other issues. This switch allows you to "cut off" below the selected frequency so the amp/sub will not reproduce anything below that frequency. Try the switch at 15Hz, if you notice you are having odd sounds issues with the sub, try it at 25Hz.
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