Bruce.
I would agree with your assessment. When mine were running on the back patio, with just the standard mushroom muffler attached, it was quieter than the average gas lawn mover. When I moved it from the concrete patio to the lawn, it was quieter again, probably due to loss of reflected sound.
Seem to recall that when it was under load charging a battery, the sound level dropped a bit more as well.
David
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