@MrWalkman kindly offered me early access to the FE+ firmware to test out and provide some feedback. Many thanks brother!
One big disclaimer - I’ve never tried the original FE firmware. I’m upgrading from DMP-WM1 Mk2 to FE+, so my perception of sound differences are probably more dramatic than someone who’s upgrading directly from FE.
For testing, I used Campfire Andromeda's (stock 3.5mm cable in high gain) which aren’t the most revealing IEM in my arsenal, however I've been listening to them a lot recently so their sound characteristics are fresh in my mind. Synergy is king in this hobby as I’m sure you all already know, and this firmware upgrade certainly plays well with the already excellent synergy between the Andromeda and WM1Z. For reference, the Andromeda has a slight V-shaped/U-shaped sound signature.
Starting with bass, contrary to some other impressions of FE+, I have zero complaints about bass quantity. To me the bass sounds excellent and better balanced with the rest of the sound signature. I actually prefer this bass presentation compared to previous firmware iterations I’ve tried. There seems to be a slight reduction in the mid bass compared to Mk2 which helps clean up some of the excessive bass warmth and the result is a more precise slam with a greater sense of detail and nuance. Sub bass extension is still as deep as my hearing can go and I hear more rumble which I suspect is by virtue of the reduced mid bass bloom.
The midrange is where I hear the greatest difference compared to Mk2. The mids sound more forward compared to previous firmwares I’ve tried. A by-product of the forward mids is a narrowing of soundstage width perception, but this brings a better sense of stage depth to my ears. I personally prefer more forward mid presentations with a bit of stage width reduction, as I feel like I can pick up more microdetails and nuances in vocals and midrange instruments. This works especially well with Andromeda’s to balance out their sound signature.
Moving up to treble, I can hear a heavier note weight density and refinement in the lower to mid treble region compared to Mk2, but I do feel like there’s a slight reduction in the upper treble frequencies. That could just be a by-product of the more forward mids? I’m not sure exactly. However with that said, the treble region overall still sounds quite energetic and airy, coupled with a beautiful sense of musicality and flow.
Overall, I hear a great sense of fullness and weight to each note across the FR, and a much more resolved midrange which creates a beautifully natural, organic and realistic perception to my music. The forward mids make the stage presentation slightly narrower however I feel this is a worthwhile sacrifice for a more realistic and detailed sound.
I am really enjoying the differences I am hearing and will be keeping the FE+ installed on my WM1Z
I think
@MrWalkman has done a fantastic job with this update and I’d encourage anyone with a WM1 Walkman to give it a shot and see if the new sound improvements work with their setup.