Senneheiser HD600 Package Deals.  These packages are suitabale for the dual prong Sennheiser headpones, including the HD414, HD420, HD430, HD525, HD545, HD565, HD580, HD600 and HD650.

Sennheiser Pono Package:  This includes   (a) pono-player (dual 3.5mm) to  Senneheiser (dual prong) cable (plush sleeving, 4 feet) made with Standard 24 AWG wire and, (b) adapter consisting of a traditional headphone stereo plug (your choice of 3.5mm, 1/4" or combo 3.5mm 1/4") to dual 3.5mm female jacks (plush sleeving, 1 foot), made with Standard 24 AWG wire (the largest wire that will fit the 3.5mm receptacles).  This package allows you to connect your Sennheiser headphones to the PonoPlayer in balanced mode, and also,using the adapter, the headphones can connect to traditional unbalanced sources.

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Sennheiser Balanced Package:  This includes:  (a) 4 pin male XLR connector to Senneheiser (dual prong) cable (plush sleeving, 4 feet) made with Standard 24 AWG wire and, (b) an adapter consisting of a traditional headphone stereo plug (your choice of 3.5mm, 1/4" or combo 3.5mm 1/4") to 4 pin female XLR connector (plush sleeving, 1 foot) made with thin 24 AWG wire.  This package allows you to connect your Sennheiser headphones to balanced sources via the 4 pin male connector, or traditional unbalanced sources via the adapter (combo connector shown). 

Sennheiser Onkyo Package:  This includes:  (a) 2.5mm TRRS-to Sennheiser HD600/650 type cable (plush sleeving, 4 feet) made with Standard 24 AWG wire and, (b) an adapter consisting of a traditional headphone stereo combination plug (3.5mm 1/4" screw on adapter) to female TRRS (2.5mm) (plush sleeving, 1 foot) made with 24 AWG wire (our MiniCombo).  This package allows you to connect your Sennheiser headphones to the Onkyo DP-X1 or Astell & Kern balanced balanced sources via the TRRS plug or traditional unbalanced sources via the adapter

HiFiMan RE-600 Pono Package.  This includes a pair of HiFiMan RE600 IEMs (normally $199) and a short balanced mode adapter cable (normally $70) that has two 3.5mm connectors on one end (for Pono) and a TRRS female jack on the other to enable the IEMs (which ship with a balanced TRRS cable) to be used with the Pono Player in Balanced Mode.  Total price is $250.