12/27/2023 0 Comments Ground isolator power strip![]() As a guitarist, these problems can wreak aural havoc with amount of buzz and hum issuing from my amp. Playing at the various clubs around town, I run into my share of “dirty power” typically caused by poor wiring leading to ground loops. And there may be more than one subpanel.Some of you may know that I moonlight as the guitar player in a hard-edged blues/rock band. These connections inside the subpanels must be removed. Unfortunately, your typical breaker box ("sub panel") from Home Depot has this connection installed as a default and many (most?) electricians do not know to remove the bond when installing it as a subpanel! If these subpanels are installed distant from the main panel with N-G bonds inside them, you have a noise field generator. According to the National Electrical Code, there should be one and only one connection ("bond") between the neutral and ground and that should be inside the main breaker panel at the service entrance (where the wire from the street comes into the building). The most common of these is an extra ground-to-neutral bond. All of these are dangerous safety violations that must be fixed immediately. The most likely culprits are improperly routed 3-way switch, improperly routed Edison shared neutral circuits, ground-to-neutral bond out on the branch that allows the return current to travel the wrong route, or a batch of neutrals from several circuits bundled together. The hot and neutral must stay together in the same conduit, ideally twisted together, if they travel separated routes, they become a magnetic field generator. ![]() Current is traveling around a physically large loop. Have the electrician very carefully check the AC power circuit of the lights. It is possible that the AC wiring was done wrong and must be fixed by a professional. Sometimes an installation is still too noisy even when everything is done right as above. When it is time to call the electrician.Or just leave the preamp on all the time. Or these wireless remote controlled outlets Woods 13569 Indoor Wireless Remote Control (3-Pack). Or this load sensing power strip can also turn off the amp s Smart Strip SCG3 Energy Saving Power Strip with Autoswitching Technology. At $25 hard to beat this one from IoTPower Relay. Xantech AC1 allows 12V trigger equipped preamps to turn off the power to the amp. Turn the amp off when preamp is off. Some systems will have noise if the preamp/receiver is turned off but the amps are left on.Maybe try a cheap one to see if it fixes the problem, then buy the nice Jensen one for the low distortion and wide frequency response. or Blue Jeans Cable Isolation Transformer. Like this one for XLR Jensen ISOMAX GX or for RCA Jensen SUB-1RR. ![]() If the shell of the XLR is connected to ground, you may have to remove this connection as well. In this case, ground the preamp as in Step 2 above, AND lift the ground wire inside the XLR at the amp end by cutting the wire to pin 1 inside the shell or using an XLR ground lift adapter l ike this. If XLR to XLR connection is used and you still have hum, chances are your preamp has a 2 wire AC cord and the power amp has a 3 wire AC cord.The RCA tip connects to pin 2 in the XLR. ![]() Shield, Ground (pin1), and Pin 3 (white or minus) should all be connected together at the RCA (sending) end only.
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