I have been using the ER-4P directly connected with an iPod Nano and it has a good sound for the office and is portable. I also use the 4P-S ETY adapter cable with an ALO Super Cotton Dock and a Hornet M... Not quite as portable but wonderful sound.
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“I have the simplest tastes. I am only satisfied with the best"
- Oscar Wilde
My First Portable Rig:
iPod Nano (1st Gen) > ALO Cryo Dock > RSA Hornet M > ETY er4p-s Converter > ETY ER-4P(s)
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