40Hz to 26KHz (-3dB limit)- this means your speaker will accurately produce the range of frequencies from 40Hz all the way to 26 KHz (ie dog-hearing). The signal strength will not lose more than 3dB of sound at any of those frequencies
90dB efficiency (1w, 1m)- each speaker, when powered with 1 full watt of power (normally the 0 or referece point on the receiver output), will produce 90dB of sound pressure at a distance 1 meter from the speaker
crossover frequency- 2.2KHz- this is the point at which lower frequencies are directed only to the driver speakers. all frequencies above this will be sent to the tweeter (this one was easy since they are only two-way speakers)
all of these are excellent levels for these specifications.
