Koss PortaPro (modified by HiFlight)
Will Ship To: Continental U.S.
For sale is my Koss Porta-Pro with mod performed by Head-Fi user HiFlight.
Details of the mod can be seen on Ron's site, http://www.hiflightaudio.com, but the modifications include replacement of the plastic driver covers with a pattern of drilled holes, application of resin coating, and replacement of stock pads (included as extra) with larger, open-center pads. Note that this is the standard impedance version.
Selling because I purchased simply to understand what Charles Altmann used as his reference when tuning the Tera-Player.
Price includes PayPal fees and insured shipping inside the continental U.S. via UPS Ground. Sorry, but I'm not interested in trades or lower offers.
Thanks for looking.