you will be fine.. they are being a little over cautious.. i have an onkyo 701, and the manual says the same thing. the 6ohm load of the QS8's, are easily pushed by the onkyos due to the fact that the QS8 are very efficient speakers.. now, i would NOT use the onkyo to try and push a 4ohm load like the M80 towers. .. that would be stretching the abilities of the receiver.. but have no concerns with the QS8's. it wont be a problem!
BTW- the onkyos do get warm.. so be sure and allow them plaenty of ventilation.
bigjohn
