Brief comparison of AV4, and FitEar MH334 I found on FB ( https://www.facebook.com/AvaraCusto....1073741828.1466716040036517/1691690540872398
) using AK380, and Hugo 2. Here are some points noted, and translated:
+ AV4 was tuned with FitEar MH334 as its basic reference.
+ Bass quantity is less on AV4 than 334, giving the impression of the midrange sounding cleaner. The 334 not only has a bigger bass, but also higher quality.
+ Soundstage-wise, AV4 is a bit bigger.
+ Instruments sound more detailed, and apparent with AV4.
+ 334 sounds more full-bodied, and sweeter. While AV4 presents itself with a lean, and cleaner sound. Note size is thinner on the AV4, making its separation ability better.
+ Midrange, vocals, and tonal balance is similar on the AV4 to the 334.
Keep in mind that everyone has a different sound preference, so YMMV.