post #1 of 1
Thread Starter 
This Classified is Closed

For Sale:
IC: Yamaha HP1 with anisotropic magnets

Will Ship To: Anywhere

Selling my collection, please also check my other ads


Interest check for now, not quite sure I want to let these go.


Yamaha HP1 with box, near mint condition. Pads in great condition. This version is the rarer one with the black box.





From link:


There are certain HP-1s with a slightly different driver. These were sold in black, rather than silver, boxes and have anisotropic magnets, which appear to be the normal ferrite discs used in most HP-1s but with thin, perforated iron or steel plates attached to the outer surfaces of the driver, which very much resembles the later YH-100 driver but is a couple of dB less efficient. There was no model change on the headphones themselves, just the appropriate change in the magnet specification, and the sensitivity (efficiency) showed a 2dB gain (see below-- also note that the service manual gives only the sensitivity of the Anisotropic model). It is uncertain so far what, if any, sound differences these drivers exhibit."

Will answer questions within 24 hours.

Edited by Joe Presto - 7/13/13 at 3:31am