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Got to get a LOC, really need some suggestions/help
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<blockquote data-quote="maylar" data-source="post: 8035337" data-attributes="member: 541144"><p>As you said, most times we don't hear turn on pop because of the amp's turn on delay. And most amps have a "soft start" feature.</p><p></p><p>Turn off pop is a bit different. An active LOC has its opamp biased to 1/2 the battery, with a capacitor to decouple that from the output. When the LOC's power disappears the coupling capacitor discharges through the amp's input resistance. If the amp is still active (power supply not yet discharged), you get a pop or thump through the speakers/subs.</p><p></p><p>Dealing with this can be a real PITA. My Audiocontrol EQL does it (no excuse IMO) and I have to put a relay between the EQ and amp inputs to disconnect them when remote drops out.</p><p></p><p>Passive LOCs that are just transformers don't do that. And good LOCs like the Navone unit don't either.</p></blockquote><p></p>
[QUOTE="maylar, post: 8035337, member: 541144"] As you said, most times we don't hear turn on pop because of the amp's turn on delay. And most amps have a "soft start" feature. Turn off pop is a bit different. An active LOC has its opamp biased to 1/2 the battery, with a capacitor to decouple that from the output. When the LOC's power disappears the coupling capacitor discharges through the amp's input resistance. If the amp is still active (power supply not yet discharged), you get a pop or thump through the speakers/subs. Dealing with this can be a real PITA. My Audiocontrol EQL does it (no excuse IMO) and I have to put a relay between the EQ and amp inputs to disconnect them when remote drops out. Passive LOCs that are just transformers don't do that. And good LOCs like the Navone unit don't either. [/QUOTE]
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Got to get a LOC, really need some suggestions/help
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