There is a very posh zipper carrying case with individual pockets inside to hold different size ear tips, cable adapter, instructions and measured performance specifications. Extra sets of replaceable filters, an insertion tool and specific instructions are also included.

I gave both new models a test run here at my studio using the same Aphex Headpod 454 Four-Channel Headphone Amplifier I always use for evaluating all headphones and in-ears here at my studio. I went with the large foam ear tips and once I had them in my ears, I was very surprised how much isolation from outside sound was possible and at the same time how full range they sounded. I compared them to different sets of molded in-ear monitors with multiple drivers and found them to nearly match. In general, the molded multi-driver pairs had more power in the mid-range for live stage work but required more amplifier power.

The ER4XRs had good bass and were capable of loud playbacks. The two (L and R) anodized metal bodies are not marked left or right so there was a little guessing there each time I put them in. But by switching them to the correct sides, it revealed how closely matched they are in frequency response and loudness.