And would I need the L9 cable for this? Would it improve the quality very much?
Thanks for any replies or help.
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And would I need the L9 cable for this? Would it improve the quality very much?
Thanks for any replies or help.

Unfortunately the higher output impedance of the E9 is likely to have negative effects on SQ with those low impedance phones.
The E7 on its own, however, should do nicely with them as a portable amp.
As to the L9, it would be much better than just using the headphone out of the iphone.