Minus K 50 BM-4 Passive Isolation Base

For your consideration is this Minus K Technology 50BM-4 passive isolation base. This is the 17" x 17" model rated for 20 to 50 pound loads. It came out of a laboratory environment and shows some use with some touched up nicks and scratches, but it works perfectly and as designed. Very nice condition overall. It is perfect for tube amps and smaller turntables weighing between 20 and 50 pounds. Specs as follows: Weight: Approximately 60 lb (27 kg) Dimensions: 16.8” W x 16.8” D x 8.5” H Approximate payload weight range:
50BM-4 20 - 55 lb (9 - 25 kg)
Performance:
Vertical natural frequency of 1/2 Hz or less can be achieved over the entire load range. Horizontal natural frequency is load dependent. 1/2 Hz or less can be achieved at or near the upper limits of the payload range. Simple Set-Up and Adjustment
This is a very heavy unit at 60 pounds and will be packed carefully and shipped UPS ground insured. Shipping will be $100 up front and I'll refund the difference if it's less. Please let me know if you have any questions.