We moved a few times during that period and gradually I invested in better speakers, moving away from headphones. So my K1000 stayed in the box after our last move. About a year ago I „discoverd“ the box and installed it again with the K1000 amp. The amp showed some cracking noises and the headphone made some rumbling noises, which I thought were caused by the amp. I had the amp repaired, but the rumbling noises remained. I checked with AKG service, but they told me that they do not service the K1000 anymore due to the lack of parts. I guess some of you have the same experience. I gave up and put the headphone back in the box.
A few weeks ago I got in contact with Heinz Renner, I found his name whilst checking out a Riviera AIC-10 amp, which was demonstrated with the Mysphere headphone, the successor to the K1000. I was actually looking at the amp to drive my Avantgarde Uno XD hornspeakers, not for headphone amplification. Heinz offered to have the K1000 checked and did a full service on it.
Since a week I have the K1000 back and in short I never heard this headphone playing so amazingly well. I play it in the following setup:
Riviera AIC-10 (yes, I bought it for my horn speakers
Chord Dave dac
Auralic Femto with SBooster power supply
Audio note interlinks
Roon streaming software
The combination with the Riviera amp brings all the good things of the K1000 to life. The soundstage is wide and crystal clear, without any harshness. Voices and acoustical instruments shine, the mid range is brilliant. Some people say that the K1000 does not have enough bass. I actually disagree, even with music from Kraftwerk or Daft Punk the bass performance is strong enough for my taste. As mentioned I own Avantgarde Uno XD horn speakers, so I am used to a very lively, open, dynamic and room filling sound. Once I was used to these type of speakers I always found headphones to closed and was missing the dynamics and the depth of the stage. The K1000 however has many of the characteristics I really enjoy from my speakers.
I can highly recommend to test a K1000, if you can find one, or the successor Mysphere. So far I could only listen to the new one very briefly, but is shares the same sound characteristics. I plan to do a direct comparison between the two soon.
I want to specifically call out the amazing service I received from Heinz, repairing my K1000. I own and owned many different high quality equipments over the years, but I never experienced such a service and passion for their product. Let‘s not forget, this headphone is more than 20 years old and went out of production a decade ago. From my point of view it is still one of the best headphones ever made, if you give it the right quality and power of amplification. The K1000 amp from SAC was good, but the combination with the Riviera amp is a dream. I am looking forward to see what the Mysphere can do. Thanks Heinz!