You may consider the AKG K1000 headphones which usually sell for about 1000 USD (!) on the used market. They are designed to connect directly to amplifier outputs, as they are sometimes referred to as "ear speakers"
I use a pair run off of 9 watt SET amplifiers or another pair of 2watt SET amplifiers.
I use a pair run off of 9 watt SET amplifiers or another pair of 2watt SET amplifiers.