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in my Home Theater experience, 16GA stranded copper wire is sufficent for almost all audio applications. dont let them sell you on gold plated and monster wire. it is all the same crap. there may be differences in manufacturing but the difference it produces is not even audible to the human ear. it is all about room acoustics and equilization (you remember those old analog things with all the knobs and stuff). i have taken a crappy theater install by some guy and installed all THX Klipsch speakers on the existing 18GA wire and with an equilizer and an experienced ear turned it into Tinsletown.

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Q: What gauge of wire do you need to run from a home stereo 120W a distance of 30ft to an 8 Ohm speaker?
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What size audio amplifier will you need to buy to power four 60 watts speakers 8 ohms impedance Frequency Response 120 Hz - 20 kHz?

There are several ways to drive four speakers. For simplicity, this answer assumes that the amplifier will be a two channel stereo amplifier - one channel for left and one for right hand channels. It also assumes that the speakers will be connected in parallel, that is, both positive terminals wired together and both negative terminals together. The two speakers together will be the equivalent of a four ohm speaker. First, make sure the amplifier is rated to drive four ohms to both the left and the right speaker. Most amplifiers will handle a four ohm load but some are aonly designed for eight ohms. The manual will tell you what the amplifier can handle. The speakers can handle up to 120 Watts per channel when two are used together. To fully drive the speakers, an amplifier of 120W per channel will be needed. However, that is the worst possible size of amplifier to use if you are going to run the system near its peak power output. Here's why: Speakers are able to cope much more power than their rated power. The sound will be terrible but generally, the speakers will not be damaged. Speakers can also cope with a distorted signal from an amplifier as long as the power level is a lot less than the rated speaker power. However, overdrive the amplifier when it is delivering the full power rating of the speaker and the high power distortion is very likely to cause damage to the speaker. The choice of amplifier should either be higher or lower than the speaker rating. A 30W per channel amplifier will still have a great deal of power to offer and the output will be far louder than most people would ever want in a living room. If the amplifier is over-driven, the low power level avoid speaker damage. A 200W per channel amplifier will drive the speakers harder but with a clean signal. If you want to run the speakers close to their maximum level, choose an amplifier of this power output or higher. A note about power levels: True power output is always measured as an RMS figure. Music power is approximately twice RMS power and peak music power is about twice the level of music power. Therefore, if the speakers are rated at 60W peak music power, they actually have a rating of just 15 Watts RMS. When comparing amplifiers and speakers, always make sure you use the same units, RMS, Music or Peak Music. Never mix them.


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