This is my first time hearing a K1000 with a serial number in the 1400 range. I have tried to recreate my setup as close to the one I heard in the past; the only thing that has changed is the DAC and I put the Denon integrated I used briefly back into the setup.
I swear this low SN K1000 has a lot more bass than both my pairs in the 10000 range. I will know for sure if I get a chance to take it to my friends house- he has a set in the 8000 range that sounded identical to my 10000 version with his monoblocks.