freq range, 50hz-20khz at + -3db please explain

Hi Andrewrona,

db (as you probably have infered) is the loudness value of the speaker output. Each speaker driver, cabinet design, and crossover design does not provide for the exact same volume level at each individual frequency. The +-3db refers to the change in relative volume level within the graph of the speaker output for the frequency range specified.

+-3db is very good. .....6db is regarded as the point where your hearing thinks it sounds as if you turned the volume up or down to twice the sound level, or half the sound level.

The low frequency output of speakers falls off in db very fast; which isn't a bad thing, since rooms suffer from bass loading characteristics which make it tough to get decent bass sometimes.

Best regards,

Mark

Hi Andrewrona,

Sorry, I miss stated the 6db point. It is the volume change that is normally just precievable as a change in volume - usually requiring 1/2 or twice the power applied to the speaker.

Mark

Duffydawg, there appears to be some confusion in your dB facts.

A 3 dB INCREASE is a DOUBLING of ACOUSTIC POWER [dBw or decibel watts]. A 6dB increase would be a quadrupling of dBw. A 9 dB increase would be an 8 fold increase of dBw.

Now, if we're talking about VOLTAGE, not power [dBv or dB voltage] it takes a 6 dB increase to double the voltage, or a 12 dB increase to quadruple the dBv.

People with good hearing should be able to detect a 1-2 dBw increase in the mid frequencies [not the ultra highs or ultra lows]

The dB readings are a logarithmic progression; someone will provide the formula, no doubt.