Sorry for the delay but I am done with the modded TF10 and UERM universal. I will have them shipped out today. It would have been yesterday but got delayed a bit.
First off I would like to thank james444 for providing us with this tour and eke2k6 for organizing it.
My setup with all listening is done with a Concero HP connected to my laptop.
The TFRM is definitely a change from the stock TF10. I sold mine a few weeks back so it's a shame I couldn't do a direct comparison but it's different enough where it's obvious. The TFRM's goal is to be closer to the sound of the UERM and while it is closer there is still a large difference in terms of sound. I had a hard time listening to the TFRM however. The issue I had is with the midrange of the TFRM. It sounded very strange as it's almost as if the bass is there and the treble is there and then the midrange was forgotten and just added it in as a last minute effort that didn't do much. For lack of a better term the midrange is very wonky or hollow as another member termed it. Midrange aside the bass and treble is better and closer to the UERM. While the bass doesn't reach the lowest of lows it is nice in quantity and quality for someone who appreciates a more neutral signature. The treble is also nice. It's a smooth and extended treble similar to the UERM as well. It's not smooth as in lacking details but rather lacking a peak on top that makes things sibilant.
The universal UERM I would say is close to the custom UERM but everything toned down a dial. This should not come as a surprise since my custom UERM is fitted for my ears while the universal..is not. That being said the UERM is a very good sounding iem. It has quality from top down as should any iem at this price range. The bass again is quality over quantity but it does roll off a bit as does most BA earphones I've heard or owned but that roll off is not significant to me. The quality is near the best I've heard. The mid range is very detailed, smooth and transparent. The biggest thing about the UERM is the treble is that is is a bit different than most iems with this kind of signature. It's more smooth than peaky where sibilance is an issue. Rather it's more smooth but still very transparent. The clarity of the UERM is extremely good and among the best i have heard or owned. The stage of the UERM is impressive for an iem but it's also your typical left and right but that's how iem's are. Lastly tonality as you can probably guess is close to neutral but leaning towards a bright signature.
If I were to quantify things I would say in terms of how close the UERM and TFRM is I would say a 6. In terms of how close they are on a technical level it would be a 5. I would buy the UERM (well..I already have the custom UERM so it's a bit pointless) over the TFRM at 10x the price for sure. However diminishing returns kicks in here for sure so that's something to consider.