Thank you sir!
I make speaker to line level decreasing circuit: 15 Ohm/10 Watt load resistor (wired parallel immediately after the source amp binding posts) followed by a divider network in front of the load input, 8k/1 Watt series followed by 1.5k/1 Watt parallel.
I would parallel ten of these 150 Ohm/2 Watt resistors for the 15 Ohm/10 Watt value. Unknown whether non-inductive is audibly better but it can't hurt.
For the divider network resistors I purchased Vishay S102 .6 Watt, two each parallel = 1.2 Watt.
Even using a cheap 9.5k potentiometer for the divider network and cheap ceramic resistor for the load, the speaker outputs sound better than the RCA pre outs while driving two main amps (47k each input) and one sub amp (12k)...total load resistance 8k Ohm.