Hi guys need some help

Have a splawn 100 watt and a 6505+ combo. Need a attenuator.
I have an elmwood 4x12 8ohm mono or 16ohm parallel.
Will the thd 16ohm work for these two amps?

Can someone give me a basic rule of matching ohms with cabs, heads and attenuators please.

I'm pretty sure the 6505 combos are all 16 ohms and your cab has a 16 ohm jack so the THD should be fine.

However, do try a few attenuators before buying one if possible, they do color your sound to a degree. Finding the right one that sounds good with your rig is important.