Anonymous asked in Consumer ElectronicsHome Theater · 10 years ago

does rms power output effect speaker loudness?

if it does, does it effect it much etc

4 Answers

  • Anonymous
    10 years ago
    Favorite Answer

    It does, but with higher power comes diminishing returns. A tenfold increase in power gives you what sounds like a doubling in perceived volume. So:

    1,000 watts is twice as loud as 100 watts;

    100 watts is twice as loud as 10 watts.

    As you can see, increasing volume by increasing wattage can get expensive, fast. To get higher volume for reasonable money, look at the efficiency (or "sensitivity") rating of the speakers. This spec is usually given as "x" number of decibels, at 1 watt of input, measured 1 metre away from the speaker, or "xx dB/W/m". A speaker rated at 98 dB/W/m will play twice as loud, with the same power, as one rated at 88 dB/W/m. This spec only affects volume, and has no correlation with the quality of the sound.

    Source(s): Custom AV installer for 25 years.
  • 10 years ago

    It directly affects it.

    The RMS power is a more useful measure of power than the number often quoted by consumer electronics companies, which often talk of "peak music power" or similar - a largely useless specification.

    RMS is roughly the "average" power an amplifier can output to the speakers (normally it would be quoted per channel, i.e. 60W per channel for 2 channels (stereo)).

    The more power your amp produces, the harder you can drive your speakers - up the the point where they either distort, or are damaged (either burn out the coils inside the speakers, or physical damage to the bits that move (cone, spider, surround material).

    The other main thing that affects speaker loudness is 'impedance matching' - that your amp is able to match the impedance (roughly the AC resistance) of your speaker. A mismatch can either cause your amp to overheat, or to not transfer power efficiently. A speaker is normally rated "8 ohms" or "4 ohms" or similar, your amp is either specced to connect to that level, or has different output connectors. Beware using car speakers with home amplifier, as car speakers are sometimes only 1 or 2 ohm, and can cause your amp to overload.

  • 10 years ago

    RMS (root-mean-square) is an averaging formula that measures the peak output signals and converts that to an "average" power output rating. This is opposed to peak instantaneous output ratings, which can be misleading.

    When an amplifier is operating, you may get instantaneous power output spikes as the amplifier tries to reproduce audio signals (think of a bass drum kick, where that initial "thump" requires a lot of power to reproduce at high volume). And, operating at this high of an output power (wattage) for just an instant may not hurt the amplifier or the speakers.

    But, by figuring out what the RMS average power out of an amplifier (or into speakers) is, you can get a measurement of what the maximum power rating is for continuous operation. And, this is significantly less than the peak instantaneous power that an amp can put out (and a speaker handle) without burning out eventually.

    That said, the higher the RMS power output rating for an amplifier, the more output power it has and the louder it will get when driving speakers (compared to lower power amps). And, the RMS power rating for speakers is how much power you can drive into them safely without burning them out (more isn't necessarily louder - you also have to factor in speaker efficiency, or how much output volume they put out for a given signal input power).

  • 10 years ago

    Yes, the amps rms watts output is directly related to speaker loudness (dB).


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