IHA-6 is great. It’s limit is that it doesn’t do well with highly sensitive headphones (and definitely not IEMs). It’s probably the perfect amp for low efficiency planars. For the Aeolus, for some reason I feel like a tube amp might be better. But the IHA-6 is versatile enough to drive it appropriately. It’s also got a high output impedance option which may be nice to try with high impedance headphones like the Aeolus.
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