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Frequency range vs frequency response

I should know this but am still fuzzy on it. Could someone explain the difference between frequency range and frequency response when looking at specs of loudspeakers? I know specs are only part of what you base a purchase decision on but which one of these tells the truer story about how low they can reproduce bass levels? Each loudspeaker has a low end value in HZ for these two measurements but they differ. Which one gives you the best idea of how low it can go? What's the difference? Many thanks.
pdn

Showing 1 response by uraniumcommittee

uraniumcommittee
60 posts
 
'Frequency range' is simply the range, usually expressed from Hz to KHz, that a given device will produce. It tells you nothing about the amplitude variations within the range. 'Frequency response' is usually specified as having a certain amplitude tolerance, such as "±3db", which means that the device is able to produce sound with the range specified at no more or less than 3db from the reference level at any frequency. A plot is much more useful. See the plot below, top graph:

http://imf-electronics.com/TLS80/tls80graph1.jpg
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