Disclaimer: This review is dedicated to the owner of the IEM, Vlad. Thanks to his contribution, my review on Final Audio Design products is continuing on. And of course, Inks takes credit for organizing this loan. You never fail to impress me, my dear friend.
CON: High distortion & inverted polarity, which are usual characteristics of the BAM-driven IEMs. In addition, bodily fluid from a normal usage causes oxidation of the brass housing, leaving gooey green residue underneath the ear sleeve. Users must pay attention to any possibilities of the residue getting into the driver.
ON SECOND THOUGHT #3: Unlike the previous BAM lineup, this new unvented design has higher acoustic output impedance. The most amount of attenuation a microfiber handkerchief can yield is only about 2 dB.
And the same analogy applies to Heaven V Aging- Above comparison indicates that the Final Audio Design has not given much attention to detail to bore acoustics at all: Unless deeper insertion depth than that of the reference plane is desired, users must stay away from the sleeves with a smaller bore size. They not only introduce harshness in the treble, but also cuts off the bandwidth.
ON SECOND THOUGHT #5: Surprisingly, Final Audio Design's Heaven V Aging loosely follows the Olive-Welti target without any modification applied. As their products have been all very funky, this new Heaven series is certainly a great step-up.