I loved my Blue Mo-Fi headphones, but I found them a little clunky and awkward to wear. The sound through them was phenomenal and I heard every little detail and tweak. I believe the FAS team praised them as well as some point. However they are closed-back headphones and I don’t really like that because I believe the sound and music should come from within and go outwards, not start from within and go farther back within.I use those for iems too. Just upgraded to the KZ ZS12I've gotten better results with IEM's, the KZ ZS10 to be more specific. I found the Beyers to be lacking in the mid range, and overly harsh on the highs. Specifically for the higher impedance models, but I tried lower impedance models as well and the results weren't much better. But it's all subjective anyways. I've heard the Sennheisers are more on the flat side than the Beyers. But I'll definitely have to check out the S4X's.
Earlier in the thread I mentioned I was using the Blue headphones. I had two pair, with one being for salvage and parts because they were not available on the market and I had to go through several pairs from some reseller on Amazon. And eventually the main pair were flaking off plastic and then the switch quit working; I think I sold the two pair on eBay to someone who understood their problems.
The Ollo S5X are my main headphones now, and after many years the plastic began to shed on the ear pads. Ollo carries replacements so I ordered a pair of new pads. They arrived about a week later. Installing them is very easy and took a few minutes to figure out on the first one and a minute on the second.
The S4X headphones are for when we're recording. The S5X are for when we're mastering and need something that brings out the worst in sound. The frequency response chart that came with mine was extremely flat and, except for the difference in sound because of acoustic coupling, their sound translates really well to my FRFRs on stage. The acoustic coupling makes the sound more "ballsy" so I don't try to compensate EQ until I get into sound check and can get loud.
Not if you're referring to the Ollos...they're open back.would these headphones also be good on stage? I am talking playing for musicals. We often get the headphones of the company that supplies the P.A. Sometimes I use my Beyer dt880 and they are not bad. However they are quite old now.
I don’t know for sure, I haven’t needed to look since getting the S5X.If I’m not mistaken, they don’t make the S4X or S5X anymore, but only the X1, no?
Hey Greg (and any others)- What is sound difference between the S4X and S5X in your view? Have Senn HD600 for years with JDS LABS headphone amp right now which I do like.I don’t know for sure, I haven’t needed to look since getting the S5X.
IMO, it’s VERY worthwhile looking at their products.
Looking at the spare parts in the Ollo shop, it should be possible to convert/upgrade a S4X/S5X to a X1. Does Ollo offer this? Ollo is known for its commitment to sustainability.

Earlier in the thread I mentioned I was using the Blue headphones. I had two pair, with one being for salvage and parts because they were not available on the market and I had to go through several pairs from some reseller on Amazon. And eventually the main pair were flaking off plastic and then the switch quit working; I think I sold the two pair on eBay to someone who understood their problems.
The Ollo S5X are my main headphones now, and after many years the plastic began to shed on the ear pads. Ollo carries replacements so I ordered a pair of new pads. They arrived about a week later. Installing them is very easy and took a few minutes to figure out on the first one and a minute on the second.
The S4X headphones are for when we're recording. The S5X are for when we're mastering and need something that brings out the worst in sound. The frequency response chart that came with mine was extremely flat and, except for the difference in sound because of acoustic coupling, their sound translates really well to my FRFRs on stage. The acoustic coupling makes the sound more "ballsy" so I don't try to compensate EQ until I get into sound check and can get loud.
I got mine a year before they had the EQ compensation file, but they came with the frequency response chart for each cup, and they were within 3dB of flat. From my testing it’s really hard to pick out 3dB difference in my guitar’s volume, especially in a band mix, so I didn’t care.Do you use the eq compensation file that comes with them?