I'm interested in adding http://www.amazon.com/V-MODA-BoomPro-Gaming-Headset-Headphone/dp/B00BJ17WKK/ref=cm_cd_al_qh_dp_t to a future HD598 purchase. Unfortunately, that plug is 3.5 mm.  A few moments ago I found out that that 2.5mm cable on the hd 598 has a "locking mechanism" and no other 2.5...