AnalogSteph
Major Contributor
Should work fine.
You should be able to get at least 50 mW into 44 ohms at low distortion (<-90 dB) out of the Asgard 3, at which point the 100 dB / 1 mW AT cans would be emitting 117 dB SPL - way more than you need.
At the same time, noise floor in low gain should be unconcerning as well (-82 dB ref. 50 mV = -108 dB ref. 1 V, and headphone sensitivity is ~113.5 dB / 1 V, so 5.5 dB SPL worth of noise... the rule of thumb for headphones is <20 dB SPL).
These Audio Technicas are fairly sensitive, so even an amplifier that breaks a bit of a sweat when driving low-impedance loads at high levels (like this one) will do just fine. Some notoriously inefficient planars would be a different story (there are some that only get to the mid-80s dB SPL for 1 V while having a very similar kind of impedance, this is not the amplifier I would recommend for those).
You should be able to get at least 50 mW into 44 ohms at low distortion (<-90 dB) out of the Asgard 3, at which point the 100 dB / 1 mW AT cans would be emitting 117 dB SPL - way more than you need.
At the same time, noise floor in low gain should be unconcerning as well (-82 dB ref. 50 mV = -108 dB ref. 1 V, and headphone sensitivity is ~113.5 dB / 1 V, so 5.5 dB SPL worth of noise... the rule of thumb for headphones is <20 dB SPL).
These Audio Technicas are fairly sensitive, so even an amplifier that breaks a bit of a sweat when driving low-impedance loads at high levels (like this one) will do just fine. Some notoriously inefficient planars would be a different story (there are some that only get to the mid-80s dB SPL for 1 V while having a very similar kind of impedance, this is not the amplifier I would recommend for those).