2 pieces of front cover spacer (for air sealing in installation)
This is the measurement of original IE80 at Goldenears.
And the measurements of the driver in our Rosewood shell.
Measurement is based on IEC711 coupler, a customized USB sound card and Win10 PC running ARTA software.
The frequency response (Notice the curve is almost identical as original IE80 at mid and treble, and having better extension at the 20-50Hz sub-bass).
The CSD (Cumulative Spectral Decay) – note from 1K to 12KHz, the decay is very consistent, meaning minimized interference and clear sound.
The Pulse Response – note the short period <2.5ms offering high resolution
The Burst Decay – again, note the consistency among different bands, and there are only few burst at resonance points at 6K and 10Khz.
THD and D2 – Note the yellow line is the THD of the measurement system and need to deduced from the total THD. The Also notice the D2 taking majority of the total THD, meaning the sound character is smooth and sweet.