use a 5w or 7W 100r series resistor. Take a 10r 500mW resistor from there to speaker ground. That loads the amp with 110r.
Now feed the headphones with the voltage across the 10r resistor. It will be ~-21dB ref main speaker output.
If that is too loud then try wiring a second 10r in parallel to the first 10r. this will be ~ -27dB.
Now feed the headphones with the voltage across the 10r resistor. It will be ~-21dB ref main speaker output.
If that is too loud then try wiring a second 10r in parallel to the first 10r. this will be ~ -27dB.
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