You are right. Dragon without Lundahl option drives all my headphones with no problems. I consider myself one of those guys that likes to listen to music quite loud.Reading your response, figured something was up, so I just looked over the amp, it does not use Lundahl chokes, everything I said applies only to using chokes in a passively filtered power supply.
The option for the Dragon Inspire IHA-1 is for Lundahl input transformers, 1:2.5 step up. The purpose of the transformers is to increase the gain of the amplifier, but you could simply turn up the volume. One thing to keep in mind is it is another component in the signal path, even if it is a high-quality transformer. Personally, I probably would not include it, I can't imagine any headphone would bring the amplifier anywhere near clipping, it is spec'd at 1.7W into 40ohm.
Price increase for the Lundahl option wasn't the issue. I just wasn’t sure if it was what others made it out to be (keep in mine that non of those reviewers compared those units side by side with and without Lundahl choke option). And I know if there was an issue with it having trouble driving any of my headphones, Dennis Had would install them for me at same cost as the original upgrade cost.
Thank you very much for taking the time to get this sort out for me.
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