Originally Posted by PsychoZX
There are only two headphone amps I know of that can properly drive the K1000s. That is the Singlepower Extreme and the Dynahi. Unfortunately the Dynahi's sound signature is IMO not a good match for the K1000s at all. The Extreme's sound signature IMO complements the K1000s very well.
I don't want to dispute what others have said about the necessity for a power amp for the K-1000, as I don't yet own a pair. What I can say is that besides PsychoZX I got information from another Head-fi member who is very knowledgable about the Extreme stating that he was, in fact, successfully running the K-1000 from an Extreme Platinum. So it appears that in the case of the Singlepower Extreme Platinum (my amp) that the K-1000s do just fine. Now I just need to find a good condition K-1000.
Ah, finally my upscaling startegy (from where I started which was at looking at a $400 amp) is paying off.