Hey all--longtime audio/video enthusiast, new member here. Air Force pilot in Alaska, been part of the A/V/home theater industry for over a decade now. Have used Etymotic ER-4P's for that long, and I'm on my third set now. My second set just got damaged, and I had them repaired/replaced again with the third set, which has prompted me to delve even more into portable audio. So I just sent Ray Samuels a check for an SR-71 amp and LOD cable, and I'm also waiting for my custom mold plugs to come back from the manufacturer. Between those two things, it should take me to a whole new portable audio level.
I also just replaced my broken ER-6i's with Ety HF3's as backup earphones.
I do miss my original ER4-P set. I actually preferred the slightly rubberized cord, and the all red and blue ear stems that made it easy to discern left and right to put them in the correct ears. Now, if the light level is low in the room, I have a tough time seeing which one has the red dot for the right ear. My original review on the ER-4P was listen on Ety's website back when, but they've move on to newer stuff. I use my Etys constantly while travelling, whether it's me flying, or riding in back while somebody else flies. Sometimes I'll even wear my Etys instead of earplugs while doing a walkaround inspection of the aircraft exterior, right next to running jet engines, which is quite a testament to the sound isolation.
Etymotic customer service has been top notch all along, as I've tried some different products, and had to have damaged products repaired/replaced. (all out of warranty, too) This most recent time around, they charged me more than they have in the past, but I don't necessarily expect them to be so generous every time.
I had great service from Etymotic too, I sent my HF2 to them with faulty channel and they sent me back a new set. I live in Australia. World wide excellent service, I think they assess the cause of the problem and don't simply throw a new set to customers if there is any problem.
I use the old style ER4S with the red/blue indicator, grey splitter and ACS custom tips. I don't think there has been any improvements to the sound only the aesthetics and cable geometry?
Hope the SR-71 works well with the ER4P, I recommend a high quality DAC too to improvement the signal to the amp, the ER4 respond well. Also according to posters here the custom tips can vary in success with each individual. Any which way the Etymotic provide an excellent show of the connected equipment once you get them settled. Probably the greatest value high quality product along with Sennheisers HD600/650.