hann, i'm using hs-28a now. previously using hc 150a, GET HS-28A NOW!
hahah, more quiet than 150a, you see hs-28 is longer and thinner than 150a, thus the air is able to travel more smoothly from in to out. i was told by ben and one of hailea's distributor that 28a is a much better concept from 150a. regarding the power, they are identical.
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