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6 years ago
AC power is dirty power. DC power is better because of the nature of the power, it doesn't vary. But what we use is AC power and we have to deal with what we have. Power conditioners filter "noise" out of AC power and a decent one will have a power indicator that will tell you how much AC power you are getting. If the current drops too low you can damage more sensitive instruments.
How far do you guys usually run your speaker cables from amplifier rack? I am running 25'.
Depends almost entirely on the gauge of your cable. However in most cases 25' feet is not a bit deal.
5 years ago
Many delicate electronic devices use DC power, not AC like refrigerators and other household appliances. You will probably see a lot of Electronic items that have an adapter that you plug into an AC power outlet, but the device is running off DC power via the “transformer” which is actually a full wave bridge rectifier. (Typically 4 diode rectifiers in a circuit) DC power is better because it only moves in one direction and is a lot more predictable. Being that not all countries run on the same type of power or use the same color wires in the AC wiring, adapters can be made for electronic devices being shipped to different countries, it can be made to accept that country’s AC power and will always provide the correct DC power to their device.
Alternating Current- Dirty power is actually noise in the AC power lines, caused by electro-magnetic interference (EMI) and radio frequency interference (RFI). EMI is caused by electrical interferences from appliances, especially those that use motors (copying machines, air conditioners, refrigerators, washing machines and vacuum cleaners). RFI is caused by interference from radio devices such as cordless phones, microwave ovens, cell phones and others. The myriad electrical wires are usually not shielded and are affected by RFI and EMI interference. The solution is EMI/RFI filtering built into many power protection devices, which filters out noise in the AC power line and provides clean power to connected components.
The best protection for equipment is a dedicated circuit within a building. How many places that you play have a dedicated circuit for entertainment only? Probably none. The best protection is an Isolation Transformer Line Conditioner. They are not terribly expensive anymore. Here is an example:
Tripp Lite® Isolation Transformers-Complete line isolation, noise filtering, and surge suppression offers 100% isolation from input AC line Isolation transformer design serves as an alternative to installing dedicated circuits and electrical upgrades. Remove EMI/RFI noise, utility switching transients, background spikes, and power problems generated by other on-site loads, utility grid-switching, and lightning related surges. Surge suppression components offer continuous line filtering of a full range of power line noise in all modes. Transformers feature NEMA 5-15P input and NEMA 5-15R output outlets. $164.44
The "standard" power conditions do not incorporate an Isolation Transformer and really don’t offer much protection for your equipment. Also, surge suppressors cannot respond quickly enough to “eliminate” a lightning strike that is close by. How much energy is in a lightning strike (rather than lightning between clouds that doesn’t hit the ground) is substantial. It can be 100,000,000 volts and a lot of heat to go along with it. I don’t know of any surge suppressor that can handle lightning strikes that are close by or hit your building. Lightning rods are a good idea. The best thing to do is turn off your equipment during an electrical storm, unplug it from the power outlet, and move the power cable far away from the wall outlet. In extreme cases, unplug all your equipment too.
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