Summary: RHA's MA450i noise isolating earphones generally meet my needs and expectations. These in-ear headphones block a good majority of the surrounding noise. I've used them on stage, in the office, and even mowing the lawn. They are highly portable and easy to have always with you. They lost one star from my rating as the pair I owned ended up with a loose connection in the right ear.
Summary: I originally bought the Harman Kardon trusting the name. They were deeply inferior to the stock Apple ear buds; quite tinny, I took them back. These RHA offer good noise reduction with good sound.
Summary: At first I was a but concerned about the stethoscope type noise that was being delivered up the braded cable and into my ears. After reading a few reviews I decided to find the right size ear price for me. Once I did the noise was dramatically reduced, enough so that I can't hear it at 1/4 volume. As far as the quality of sound... These out did my expectations. These little drivers carry bass so well that sometimes I feel like I am in a room full of subwoofers.
Summary: After a short break-in period, these sound great. My pair was a little metallic sounding or tinny when I first got them, but that went away with a couple of hours of use. The volume control works well, and people I talk to on the phone say that the mike is at least adequate. My first set went bad in about 2 months -- the right side went quiet, just a very faint sound -- and RHA is replacing them.
Summary: Earbuds hang in your ears and let you stay connected to the outside world. These in-ear headphones shut you right out. Which can be a good thing. The headphones come with extra rubber covers, and the size makes all the difference. Too small and the earphones were really uncomfortable -- like someone was stabbing my eardrum. Too big and they wouldn't sit right and sounded weird. I liked the middle ones.
Summary: I bought these headphones for a month now and have not had any issues with them yet. The sound is very clean. Some headphones sound muffled or too bassy or too something, but in my opinion, i think these sound balanced. The bass isn't overly powerful, the mid and tweets i think are pretty clear. Like some other reviews have said, the tweets/highs are more distinct. I think thats great because some headphones lack tweets but give too much mid or bass.
Summary: These might be the best sounding earphones I've used with my iPhone 4, very clean, detailed sound. However, they don't work well at all with my Macbook Pro, there's a lot of hissing and static noise and they're too loud. I did some Googling and found that these are low-impedance headphones, which means that they don't need a lot of power to sound good which is why they work so great with my iPhone, but Macbook Pros need a higher-impedance headphone for good sound.
Summary: I'd like to think RHA for sending me these earphones for review.
Along with the summary below, I have posted a Youtube video review of the MA450i. If you like the video, check out my channel for more reviews :)
The MA450i has an interesting build, with a reverse horn / funnel shape. This is actually the opposite of a horn speaker design in principle, and means that the MA350 fits very comfortably in the ear.
Pros: Durable metal earpieces, comfortable fit, deep bass, good included accessories
Cons: Tangly cables, lacks a little clarity, driver flex
Summary: Surprisingly good sound for a lower priced in-ear set. After breaking it in for about 2-3 days the bass is nice and pretty strong, clear and doesn't muddy up the rest of the spectrum. The trebles take some time to settle down but can still be a bit harsh at times but I've found out that the Comply Foam take care of this for the most part. The build quality of the housing, mic and cable are very good and have a premium feel to them.
Summary: I bought this not ever having even heard of RHA, so I was a bit wary. I must say it exceeded all of my expectations in terms of sound, usability, build quality, cord length, reliability, abundance of earpieces for all shapes and sizes, and overall design. I like it much better than the Apple in-ear that it replaced.