Yes, I tried the Double Helix cable and thought it was a good match.
I started listening to the SA43s with the bass switch on. Some impressions:
- Bass body is about twice as big with the switch off.
- Impact is significantly greater
- decay is ever slightly longer but a lot more noticeable with the forward bass
- Less noticeable on bass light songs; on bass heavy songs, bass is definitely the first thing that you will notice
- Mids have a slight warmth added to them
- Vocals are richer/thicker compared to when the switch is off
- There is somewhat more emotion to the mids
- Unlike some other bass heavy universals, mids are not at all recessed or veiled by the bass, just a slight different flavour
- Treble is mostly unaffected
- Some micro-details are harder to make out due to the more pronounced bass
- Feels slightly darker (~5%) but is barely noticeable
- Soundstage unchanged, still unbelievable size in all directions
- Imaging: drums, bass guitars, tuba and some horns are noticeably brought forward while others remain unchanged
- Tonality: overall richer, thicker, and warmer presentation compared with bass switch off.
- Separation: mostly unchanged, although certain high frequency instruments can sound a tiny but muffled at times
- Also wanted to add that overall, instruments appears to have more "weight" to them
For rap/hip hop/RnB, I greatly prefer the bass switch on while pop/techno sounds better with switch off. For rock/metal it was really a toss up depending on whether I wanted to focus on the guitars or bass guitars/drums or have a little extra weight in the guitars.
I can easily tell the difference between the switch on and off and the more I listen the more I am happy with the SA43s as the versatility to change the sound signature is almost like having a different IEM.
Thanks for the detailed write-up, you should probably also add it to the SA-43 review thread. I was listening to the SA-43 on a plane not too long ago and thoroughly enjoying listening to my music with both switches on at a fairly low volume, yet I still had excellent isolation from the airplane noise and the surprisingly loud crying baby a few seats away.
Thanks, hopefully this thread will help you figure out what you want after you have had time to digest the reviews of several choices.