So this has been fascinating. I had seen an email about the "new" er4's. Just finally got to checking them out. Wondered what you guys had to say. I was only 50 or so pages behind. So that took a few seconds. Anyway I am very interested.
(cough) Especially to find out about upgrade options for existing owners.(cough)
So here's my story. Bought the ER4PT's to use on stage is IEM's and to do some mixing with. At the time I had a room set up with near fields and sound treatment. These would just be to check things on. I also didn't get the P to S adapter with my set. I bought them just before they started doing that. I did end up buying the adapter at some point. I never noticed a huge difference. Definitely a little more top end and clarity, but I can use either. So I've mostly stuck with them "stock".
After a while (aka after joining head-fi) I started to wonder if there was something better. Especially in the low end. Also somewhere in here life happened (aka I now have a wife, 2 kids, and one on the way), so I don't have a treated room anymore. That said I mostly/only mix on headphones. I already had some over the ears. Senn HD280's, KRK KNS8400. Found out about the Aurisonic rockets. Bought them. And then the Flare R2's came out. Got a set of the R2Pro's. Both dynamic and single driver. I honestly have my concerns about multi-driver design. Hybrid or not. Anytime you add crossovers you "can" run into phase issues. Not saying it's a real problem. But it's a possibility. I really like both of those also and have had a hard time getting rid of either. I love the low end they have. Not that I'm a bass head, but I could hear low mid mud that the ety's just didn't seem to be able to reproduce. So my mixes never had the punch in the low mids I wanted.
So my ety's were kind of set aside and forgotten. But after a bit I missed their "air and detail" compared to the others. So they made it back into the rotation. This was a good combo. I could use different ones for dialing in different parts of the spectrum. And once things sounded right on all of them, my mixes translated quite well. This worked great at first. But then the cable went bad on one side of my Ety's.
I had seen some of the aftermarket options and decided to do more research. Again I ended up here and found ClieOS's cables. Ordered a P and a B cable. First thing I noticed was the improved bass response. Not massive or basshead, but seemingly flat down to 80hz or so. So I'm not sure if I maybe had a bad cable or what, but finally the "sound" I was searching for. Definitely not bass heavy, but I really think they used to start to roll off around 250-300hz. Just maybe a dB or so per octave. They had info down to 60-80 hz, but it was definitely recessed. But with ClieOS's cables I was able to use one set for everything and just double check on the others.
I was in audio heaven. Then etymotic says "hey look here we made them better". So after spending a good chunk of time reading this thread, I'm not sure which one's to order. Ideally both. But remember there's a reason I don't have a room with my monitors set up anymore. Kids are expensive. Almost as expensive as this audio world haha. And that's not counting the Mrs. Don't get me wrong I would trade her, but I might listen to offers.
My instinct says the SR model. You know studio reference. Seems right up my ally, but I don't want them to remind me of my initial P's. I guess I could make a better decision once I know more about the aforementioned upgrade options. Guess I could order the SR's and use the return policy if I felt it need more low end.
Also I've been seeing some talk about tips. I have tried quite a few of those (although I had no idea about the different filters), and have came to love the comply P-series tips. They have a plastic inner tube that keeps the highs from being dampened by the foam. I can get a good deep insertion and seal. Something I never could get with the tri-flanges. Any size. Etymotic's customer service was even nice enough to send me some extra long ones. The glider tips seemed to work best on me. I think I have a weird bend in my ear. Oh "moistening" trick also helps the comply's last much longer. I had almost ordered some custom silicone tips until I found the P's and that trick. I may eventually get some custom tips, but now that the comply's last 2 months or more, I don't mind paying for them.