There is snake-oil; then, there possibly is imitation snake-oil.
This one only costs 62 cents per ohm.
I have no immediate need for one, and I don't think @amirm is in the habit of using one of these before testing HP amps but - as always - ymmv.
No, it is not a BT dongle, nor a shut-up stick. It's a load [don't ask "...of what?"].
Burn-in Tool
Model No. X-L01
Function: Connect to headphone out of your headphone amplifier or player, then burn-in it
Impedance: 16 ohms
Plug: 3.5mm headphone plug
Size: φ10*4.5cm
Price: $9.90
From <https://xduoo.net/product/burn-in-tool/>
This one only costs 62 cents per ohm.
I have no immediate need for one, and I don't think @amirm is in the habit of using one of these before testing HP amps but - as always - ymmv.
No, it is not a BT dongle, nor a shut-up stick. It's a load [don't ask "...of what?"].
Burn-in Tool
Model No. X-L01
Function: Connect to headphone out of your headphone amplifier or player, then burn-in it
Impedance: 16 ohms
Plug: 3.5mm headphone plug
Size: φ10*4.5cm
Price: $9.90
From <https://xduoo.net/product/burn-in-tool/>