Difficult to comment without hearing them but looking strictly at their specifications, they have a high sensitivity of 96dB so they should be easy to drive but they are a 4 ohm nominal impedance. Their freq response range is from 58hz to 20khz so they won't get down very low in bass ext. It has an 8" mid-range/bass driver so that should provide good slam. This was the first 600 series developed and built opon the former 500 series loudspeakers. Don't know the vintage but I would guess early 1990's. Can you tell us the year they were built? Just curious. Let us know how they sound.
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