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Originally Posted by Jfs  Can I tell from the specs if the frequencies will have a proper balance: not bright in the treble; base not boomy etc? |
No.
As has been mentioned , there's a lot of invention around specifications - especially those of AV amplifiers.
Perhaps the only critical issue is whether of not a particular amplifier can drive a particular speaker. In this case the impedance of the speaker matters; as does the ability of the amplifier to drive a particular load.
The best advice is to find a dealer you like and ask to listen to some combinations of speakers and amplifiers. Most dealers do part exchanges of kit so often have second hand amplifiers or speakers.