This is the original Monoprice 8320. Unfortunately, as its right channel unit turns out to be defect, the status of this analysis shall remain preliminary until a normal working sample is obtained.
PRO: Just like 9927, Monoprice 8320 is also one of the most wondrous budget-fi IEMs in the market for its incredible value. It is quite unfortunate the right channel is defect.
CON: The frequency response bandwidth is shorter than that of 9927. Moreover, resonant peaks are more emphasized than 9927.
ON SECOND THOUGHT #1: Except with the frequency response characteristic, 8320 is almost identical to 9927. Please refer to the 9927 analysis for further details on practical variables.