I've bought both the NEI-3004 and the NEI-3001 on a cable making spree recently. Both were delivered to the United States...
Dedicated to headphones listening...
All headphone amplifiers of the company are designed on an Class A architecture.
They are associated with a high performance preamplifier with fully separated oversized power supply.
Analog output stages are 100% discrete without any OPA and multiple headphone outputs are fully balanced.
Audio-Gd headphone amplifiers are developed to transcribe a large amplitude bandwidth with precision and unmatched tonal richness without power compromise.