Frequency Response

I'll try and help. Manufacturers don't tell you all the specs such as +/- 3db linearity. You will find that type of data in a review of the speakers.
A typical floorstander may have freq. response of 34hz-20khz, but sensitivity should be high, around 88 or 90 dB ; that would be an efficient spkr.(easy to drive and can get very loud in a small room).
Also, a 4 ohm spkr will need a more powerful amp than a 8 ohm spkr. Then you need to be aware of the crossover fequencies of each driver.
I suggest start reading speaker reviews and how the specs are being measured. Hope that helps a bit.

I think +/- 3dB is the standard way of expressing the linearity of the frequency response, and if you did not quote the deviation in your 30-30k spec, I'm going to assume it. You are doing well if your speakers are only down 3dB at 30Hz - that's very nice bass response. Mine don't go that low.

I am more enamoured by speakers that are efficient (say greater than 92db/w/m) and present an easy impedance load to the amplifier - say not under 10 Ohms.

Then again, I like low power amps.

Regards,

Vapor1, actually published specs can give one a ball park idea of room interaction, of course one would need the specs of the room as well.

1) You probably can't hear above 16KHz on music

2) The lower bound is what the speaker will reproduce at a low level, not what it will reproduce at a useable output level so it's meaningless.

Music is made up of a lot of frequencies that by themselves (like a 20khz test tone) may be inaudible, but because it's music, they have a large effect on the sound. High notes can have higher overtones that sweeten the tone overall...most likely why analog (and live music) sounds different than digital, and why a good subwoofer can "charge" a room and make music that otherwise seems to lack low frequency information (mandolins?) sound more natural.