Jaybird X3 vs AKG K553 Pro

Exposure to splashes of rain or sweat won't easily damage these earphones.

The highs are crisp, airy and forward so detail presentation is very good. Bass is fast and controlled instead of boomy, so it does not muddy up the overall sound. The mids sound natural and do not get lost in the mix.
This sound signature works well with a wide range of genres and rock, pop, hip-hop and EDM will definitely sound great with these headphones.

The X3 comes with wing tips that you can attach to the earpieces. The tips enhance the grip of the headphones in the ear, and will help keep them secure even while you are running

The in-line remote will allow you to control music playback, adjust volume as well as answer/end calls.

Integrated into the remote is a microphone, so you do not need to pull out your phone should a call come in. Mic quality is pretty decent, and your voice should be easy to understand on the other line.

You get standard silicone ear tips in different sizes, along with a carrying case, different sized wing tips, premium Comply foam ear tips in different sizes, cable management clips as well as the charging cradle with micro-USB cable.

The older X2 model had bigger and heavier earpieces which made them prone to falling off, and also made it difficult to use the earphones with a helmet or a hat. The X3’s earpieces have been redesigned to be smaller, while the internal batteries have been moved from the earpiece to the remote. This helps keep the X3 in-place inside the ears and at the same time makes these earphones easier to fit under a hat or helmet.

The X3 gets around 8 hours of playback time from a full charge. This battery life is much more consistent compared to the previous model which had spotty battery life.

Signal quality is pretty stable with minimal distortion or drops, even if you are on the move.

The K553 Pro's earpads feature pleather materials which feel supple on the skin. Inside, the quality foam should provide ample cushioning. The headband also features a pleather surface and has some padding, which should help ease the pressure off of your head.

The sound is clear and accurate, and it should be very easy for the listener to pick out the details in the music. The bass level is just right without sounding boomy or muddy. The mids sound natural and neutral so these frequencies do not jump out of the mix. The highs are slightly extended, but do not make the sound harsh in any way.

These headphones have very good build quality. Solid plastic and durable-feeling plastic is used for most of the headphones' parts. The matte finish adds a softer and more premium feel to the plastic surfaces. The headband is made of metal so it can handle some flex without breaking.

The closed design helps to greatly minimize sound leakage from these headphones. People near you will not hear what you are listening to when using these headphones. Also, the pleather pads allow for a great seal which further helps to minimize sound isolation and block outside noise from interfering with your listening experience.