I have been previously rejected by Suyama for a review sample.
I could've been much nicer with this review? :)
Earlier this year, they introduced Fit Ear TO GO! 334, the world's very first generic type IEM with 3-way, 3-units, 4-transducers driver configuration ever, for whooping 105,000 JPY.
Tweeter: Knowles ED-29689 / Mid-range: Knowles CI-22955 / Woofer: Sonion 33A007
And perhaps the most intriguing effort would be the titanium-tubing high frequency bore, which is supposed to keep any type of acoustic intereference of CI-22955 & 33A007 away from ED-29689. Although it may sound great, the manufacturer, Suyama, has yet to explain the scientific principle behind this rather radical approach.
CON: There is a channel mismatch in the lower frequency range, as much as up to 3 dB. Nothing big of a deal, if 334's price tag is not considered.
ON SECOND THOUGHT #4: Try to block one of the side bores (in this case, the lower one), and add a 100-Ohm resistor to your 334; a nicely tamed mid-range obtained. And the damper for the titanium tubing is merely of a 330-Ohm, so don't even bother with it unless less treble is desired. BTW I wonder whether Suyama actually acquired a proper authorization to use the triple-bore technology described on US8116502, patented by Logitech .
Special thanx goes to my friend, vAsurada.