![]() ![]() First, a proper grounding scheme and cavity shielding treatment will usually reduce single coil hum to a minimal level. However, most hum is not a pure tone centered on 60 Hz (or 50 Hz, depending). There are a few ways to improve this though. For most of the rest of the world, set this to 50 Hz. Shielding should be effective in most cases and isn't frequency specific. Set the frequency to match the frequency of your electrical power source. I used to have a guitar amp that picked up the local police radio. It is a miracle that we aren't all micro-waved to a crisp. Unfortunately we live in a total radio spectrum enviornment ranging from a few cps to giga frequencies. Also take into account that some countries use 50 cps not 60 cps and there are flouro tubes which can emit a whole raft of harmonics. I know no one really would know right away, was kind of hoping an electronics guru here could help us work together to make something happenĮrrrrr. Like a magnetic south capacitor or something.ĮDIT: A solenoid coil isn't as small as a cap, yet it's cleaner looking than a dummy coil strat boppin I suppose. Of course there is always various levels of noise even when using a gibson type guitar etc, what I am wondering however is, instead of canceling out the pickups noise using a dummy coil, is there some sort of capacitor that would have reversed polarity like a coil that you could install? I am very sure about what I mean, just not my words. I think some shipboard systems are also 400Hz. Singing away smack in the middle of the guitar range. I used to practice in a rehearsal studio in Strawberry Hill (London) which was in a railway arch, and we picked up hum from the 3rd rail system running overhead: this was 400Hz. The steeper you make the filter roll off, the worse the phase distortions effects would be and, in the end, you would actually start to get a time delay effect.īy the way mains hum is not always 60Hz hum! In Europe we have 50Hz domestic mains, and that's not the only option either. To get the roll off steeper you would need to use multiple active filter sections - now you need a battery. A passive filter (a capacitor, plus maybe more resistance and inductance, although you get both of those from the pickup coil already) has a very restricted roll off. If you wanted to use a high-pass or notch filter you would find it's impossible to just remove the mains frequencies you don't want without affecting the guitar frequencies you do want, which are actually pretty close to the main frequencies. Sometimes, there is no piece of sound containing only noise available. This will remove the background noise from the selected part of the sound, according to the noise profile constructed previously. In either case you will run the guitar signal through more wire which will have some effect on high frequencies. The plugin will scan the selected noise and construct a noise profile. The dummy coil approach is one compromise, so is the humbucker. In other words, if you want to remove mains hum you have to compromise somewhere. Noise removal is a classic engineering problem, and like (almost) all engineering problems TANSTAAFL comes into it: there ain't no such thing as a free lunch. ![]()
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