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Speakers come in a range of sensitivities, which when tied with varying distances from the listening position, result in varying volume levels from each speaker. That's what those adjustments are meant for. It's merely a volume control for each individual output. A speaker with a sensitivity of 90db will produce 90db of sound at 1 meter with 1 watt of power. If you have another speaker with a sensitivity of 89db, you'll need to increase output from the receiver to that speaker to get equal output.
I wouldn't worry about what the receive indicates the volume is (typically shown as an amount of attenuation). It's going to vary depending on the source anyway. The volume setting for our DVD player (typically -54db) is considerably different from what it is for our CD player (typically -62db). There's no adjustment you can make that will make things safe other than safe listening levels. So long as your amp/receiver isn't undersized, you should be rather safe regardless, although a subwoofer will generally take a load off the receiver and will take "dangerous" low frequencies away from the other speakers.
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