Super Mario Jump Sound

I have SDA 2B studios powered by an Adcom GFA 555. When I power down the amp, about ten seconds later there’s a little squeal from the right channel that sounds just like Mario jumping. This wasn’t there when the speakers were wired directly to my Yamaha RX-V1800. Any ideas? The DC offset is 7 and 38mV


  • ClipdatClipdat Posts: 3,534
    Sounds like typical Adcom power down transients.
    Got Dayens?
  • codycatalistcodycatalist Posts: 1,370
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  • boston1450boston1450 Posts: 5,908
    Are you turning units On/Off in the correct sequence?.... (Turn On) Preamp/receiver before amplifier.... (Turn Off) amplifier first wait 20-30 seconds for it to completely power down n then turn off the pre/receiver. Just a thought
    Randy in Maine
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  • Tony MTony M Posts: 5,361
    Here's his I guess;
    Most people just listen to music and watch movies. I EXPERIENCE them.
  • AdamSDCAAdamSDCA Posts: 16
    Sounds like it’s normal. I’ll try the different power-down orders to minimize but as long as it’s not a symptom of some ominous issue then I won’t worry about it. Thanks!
  • boston1450boston1450 Posts: 5,908
    Ive heard Adcoms do this. My 555 never did & it matched well with sda2bs well. Im no tech. It never hurts to check all connections & clean all cables/wires (we sometimes over look tiny things). I would test amplifier on another & see if it FOLLOWS & then you will know. Sometimes it can be fun to play with audio :) Good luck n report back. Lot of Adcom fans here
    Randy in Maine
    CRS+ TL'd 198 tweets
    RTA15 TL'd198 tweets
    All TL upgrades by WMG
    Cs1000p - MIT speaker cables
    Pangea power cords
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