![]() The largest improvement in smoothness, transparency, depth of image and lowered noise level is obtained using an adapter allowing the AC line to neutral plug-in caps to be placed near the CD player (DAC/transport IEC input receptacle). The capacitors connected from AC line to neutral should be plugged in as close to the CD player (or DAC and transport) IEC power inlet(s) as possible. Alternatively, a 100,000 ohm 1/2 watt resistor can be soldered across the caps to automatically discharge the caps rapidly on removal from the receptacle. Always short out the plug prongs before handling. Later, as you look for more improvement, you can keep increasing the number of caps/adapters as your budget and spouse allow.Ĭare should be taken when removing one of the 120v AC line-connected capacitor plug-in units from the receptacle since the capacitors may be charged up to over 180 volts at the moment of removal. This would greatly improve transparency and lower the noise floor without massively covering every receptacle/line in the house. However, this point is well beyond any practical concern.Ī moderate initial filter configuration could consist of 100 microfarads total (AC to neutral) at the system outlet, another 100 microfarads total (AC to neutral) distributed around the house, and 300 microfarads total (neutral to earth ground) distributed around the house. Ultimately, increases in total AC to neutral filter capacitance would be limited by buildup of excessive capacitive 60HZ charge/discharge currents in AC and neutral. We have not yet found a point of diminishing sonic returns in increasing total capacitance. Beyond this, the more capacitance on the more AC receptacles and separate AC lines the better. ![]() Even small to moderate amounts of filter capacitance significantly improve the sound. There is no specific optimum number of power line filter capacitors. The 120 VAC line to neutral capacitor adapters should of course be carefully insulated using tape and/or shrink tubing to thoroughly insulate the caps and wiring to the 2-prong plugs. Some of the capacitors should be connected from AC line to neutral, and others should be connected from neutral to earth ground. If correctly utilized, such hand-made plug-in filters have a huge, almost unbelievable effect in improving the sound of digital, an order of magnitude more than the commercially available units mentioned previously. There are no commercially available units equivalent to the designs suggested here. Inexpensive and simple AC filter adapters can be made using large-value metallized polypropylene film capacitors. Only for the EXPERIENCED HOBBYIST who is familiar with a soldering iron and basic house electrical wiring practices. This chapter takes on the following subject:ĭo-it yourself approach to AC line filtering The website was full of useful information. I recovered Magnan’s AC related tweaks, as, unfortunately, his website seems unreacheable.
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