66 Audio BTS Pro vs Onkyo W800BT

The BTS Pro is quite robust and can withstand some minor splashes of sweat or rain as these are sweat-proof. They are not completely water-proof though, so you should not get them soaking wet.

There is good detail in the highs and the mids can also be heard clearly with very little muddiness. The lower frequencies are boosted, resulting in a good level of depth and power to each bass thump.

The BTS Pro ear cups sit on the ears with hooks keeping them in place. The flexible connecting band provides good clamping force and can adjust to your head size with continued use. Combined with cushioning on the cups, these are comfortable to wear and will stay in place.

Bluetooth connectivity allows the BTS Pro to connect with smartphones and compatible music players wirelessly, so cables won't be an issue.

66 Audio's Motion Control iOS App gives users added functionality, including EQ control and presets selection, battery status indicator, and even headphone position tracking. These features can improve the listening experience and also minimize the chances of you losing these headphones.

With up to 40 hours of playback time at full charge, it's more than enough for most listening sessions. You won't have to charge these frequently.

A hard shell carrying case is included, which can protect the headphones from minor impact and also make transport much easier. The case also has good aesthetics.

They are easy to bring on the go as the ear cups can be folded into the headband. This further reduces the already slim and compact size, making them easy to chuck into a bag when on the go.

The right ear cup of the BTS Pro features buttons for controlling headphone features. You can play/pause tracks, increase/decrease volume as well as answer/end calls by pressing the corresponding buttons, negating the need to pull out your phone to do so.

You do not need to take the BTS Pro off in order to answer incoming calls. There is a built-in microphone which allows you to easily take or make calls in the middle of your run or workout.

Instead of being bloated and overpowering, the bass is punchy and fast so while these will not be able to produce a lot of rumble. Thump should be satisfying for most users. The highs are nice and airy with a lot of detail yet never become harsh, so these are not fatiguing to listen to. The mids sound very natural and jump out just enough to make vocals and guitars very easy to hear and appreciate.

These should work best for more vocal and instrument focused genres like jazz, rock, classical and the like. Bass heavy tracks will still sound good with these, though these headphones will not be able to give the deep bass that bass lovers will be after.

The carrying case has an internal battery, and with a full charge, can supply the headphones with 5 full charges on the go.

The soundstage that these produce gives the music an open feel with good instrument separation. This quality will help give the listener an immersive music listening experience.