The
BQEYZ Autumn are a very underrated midFI single DD set.
The magnetic swappable concept for changing filters is very innovative and allows swapping of filters in just a matter of seconds. This gives less wear and tear than traditional screw on nozzle type filters. Sometimes it is such a hassle to change nozzles on other IEMs that have a tunable filter, that one just leaves on a default filter and calls it a day, which isn't the case with the Autumn.
Graph of BEQYZ Autumn via IEC711 compliant coupler. 8 kHz is a coupler resonance artefact.
The tuning filters here work, and ain't gimmicks, cough cough looking at you BGVP DMG! While the filters appear to only affect the bass region, the ears perceive the entire frequency spectrum as a whole, so changes in the bass will cause a "see saw" effect on the treble region and vice versa.
The
grey filters (AKA bassy filters) give a V-shaped sound signature. Bass is just a level shy of bona fide basshead levels.
The
gold filters (AKA balanced) are the default filters, and provide a U-shaped balanced sound, as per its namesake and is my favorite configuration. The most-all rounder.
The
silver filters (AKA treble filters) give a cold neutral tuning with added clarity and micro-details with a neutral bass.
Micro-details are above average, though there might be some multi BA/hybrid competitors with better resolution. Soundstage on the BQEYZ Autumn is excellent, with good height and width. This aids instrument separation with no congestion noted even on busy tracks. Imaging is decent but not class-leading.
The Autumn have good instrumental timbre, and are quite solid in build.
Some nitpicks are: the Autumn has an occasional glare at the 5 kHz region though, and scales better with amping. Isolation is also below average.
Compared to some midFI single DD luminaries, the Tanchjim Oxygen have better technicalities and resolution, but is more expensive and has a poorer fit (too short nozzles). Note weight is also thinner on the Oxygen. The Autumn are slightly better than the Moondrop KATO in terms of technicalities, and the 3 tuning options give more versatility than the 2 screw on nozzle configs on the KATO (which are very subtle changes in sound signature).
All in all, more folks should try the Autumn, they are very versatile. Trebleheads to bassheads should find something to like about them, and the innovative magnetic swapping tool to change filters is really quite ground breaking.
