It's ported or vented out the back. I decreases back pressure and can lower the in system resonance point.
Head-Fi.org › Forums › Equipment Forums › Portable Headphones, Earphones and In-Ear Monitors › Sleek Audio SA7 and SA6R (update: SlashGear Prototype Preview)
Sleek Audio SA7 and SA6R (update: SlashGear Prototype Preview) - Page 7
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Head-Fi.org › Forums › Equipment Forums › Portable Headphones, Earphones and In-Ear Monitors › Sleek Audio SA7 and SA6R (update: SlashGear Prototype Preview)














I thought the SA6 was already close to top tier universals in sound quality, so I am pretty sure that the SA7 will be right up there with the best.

