What are the most under-appreciated products?

Marco,

Are those speakers casually known as the Fart Winds and the Dog Asses?

I have had great success using Aurios under my Dynaudio Temptations. Also under my SA-1 Front end and DVD player.
Super tweak!
Cheers,
Gregg

I think Emission Labs tubes are not as well known as they should be. I use the Emission Labs 45 Triode tubes in my amp, and they are the equal or better of any NOS 45 tubes that I know of. You can get them perfectly matched, and brand new with a warrantee, instead of getting 50 year old tubes that are used, not matched, and uncertain lifetime. I love 'em. Not cheap, but very well made, and sound fantastic.

Eico tube amp kits. Comparable to Dyna Kits (later Dynaco) for less money. Ah for the good old days when matched KT 88's went for $25.

David Berning products, way ahead of their time. I have never before seen such advanced tube circuit designs, utterly impressive engineering and sonics.