Yamaha YH-WL500

Did you think that with cordless headphones you will get rid of cords? Wrong. In case of YH-WL500 headphones, yes, but only around your head. Due to peripheral supporting equipment you must use two cords - one to bypass sound between your instrument and the separate transmitter module. Plus, the transmitter module also needs a separate power supply cord. Even though my Yamaha keyboard is equipped with Bluetooth, despite my multiple attempts it refused to directly connect to, face-to-face, Yamaha headphones, it remained “blind” (?!). The headphones can receive sound only indirectly through the additional, separate transmitter bypass module (In a photo, it looks like a stand and headphones charger). Every time they need about 10 of seconds to connect. Indeed, practically there is ZERO SOUND DELAY (why to use high-brow, academic word “latency” ?). By description, headphones frequency is standard: 20 - 20.000 Hz. I do not know how it would handle Mahler symphonies, but when it does it to my keyboard, the sound is delivered perfectly, sonorous and juicy; naturally defined and spacious. In comparisons with similarly priced headphones the battery durability (9 hrs) is short; some competitors cordless headphones reach almost 3 times longer working time. The design leaves few things to be desired. I have middle-sized ears but they hardly fit within inner surrounding ear pads. The white side plastic “sideburns” are not god idea, they look tatty.
The head-wear feeling is rather comfortable.
I find its high price is chiefly in an instrument's sound reproduction zero delay. With such novelty feature hardly has it any market competition. Obviously, no delay (latency) is its main trump card. Still, I find this model an evolutionary half-solution, waiting for the higher model without a compromise transmitter module, CONNECTING DIRECTLY , without delay, with an instrument’s Bluetooth.
MY PERSONAL DETAILED ESTIMATE
Sound: 5. Technical solution: 4. Design :4. Head-on comfort: 4. Attached 2 cords quality (length & width): 2 ( I instantly replaced them with longer and thicker ones). Overall value for money: 3,5.
Unfortunately, on their page Yamaha producers do not describe roughly estimated headphones built-in battery total lifespan.
The last , but not the least. Has an independent RESEARCH been done on influence of high frequency Bluetooth WAVES ON BRAN - is it carcinogenic-safe and so?
THE PUNCHLINE.
I have Yamaha YAMAHA HPH-150B When it comes to tailored exclusively for an instrument connection (they have a cord) they are the undisputed market winner! I compared them with significantly more expensive Kawai and Audio Technica headphones , YAMAHA HPH-150B scored as better and as equal. (I am using only the instrument sound transmission criterion.) They are very light and when you put them on, you forget about wearing them , as if a humming bird sat on your head. With their sound quality (40 mm speakers) they fully equal YH-WL500 sound quality.
So, before buying YH-WL500 think twice. Would you prefer to get read a cord around your head, OR to to still have this cord, but with double lighter “headgear” stuff, over three times cheaper, with lower energy consumption and doubtlessly higher longevity?
Regards, M.M.

As someone who often has to practice in silence when I saw these headphones which offered a wireless I purchased them straight away.
They are exactly what they say they are. The latency of these headphones is low enough that it can be considered non-existent. The freedom they offer for anyone tired of getting tangled in wires is almost worth it alone.
They sound is a bit more to the bass-y side but can be corrected with EQ.
The cable for the plug is very short though I discovered it works perfectly fine if plugged into a USB port in my desktop so they are easily within reach.
These minor gripes aside they are very comfortable and the semi-open back means they can be played for hours without fatigue.
I currently have they hooked up to my Quad Cortex and even with the Cortex feeding through my DAW and back out and the round-trip latency all that entails (my PC is very fast) it is still well within acceptable limits.
A great purchase for QoL.

Latency is indeed low and the headphones are comfortable to wear. Unfortunately they don't cover much distance and at least in my environment I get some interference (random noises and cut offs) from other wireless devices (tried moving them to other channels but no luck). The base/craddle is poorly designed, a simple magnetic cable would have been much better. Headphones would randomly turn on when left on the cradle even if cradle is not plugged in the power USB. On/off switch has a very stupid design: you are never sure whether you manage to successfully turn on/off - if you don't have them on your head you can't hear the "power on/off" message and if you do then you don't see the LED. A simple on/off slider and separate pairing button would have been much more intuitive.

The headphones arrived promptly and are easy to set up but the supplied 'power' connection lead is far too short.
The semi closed backs are perfect for playing guitars, e-drums etc and the latency is very low as described. The Bluetooth connection is very reliable in the same room but it does find dead spots around the house which is not a problem as for me the primary use is for music. They are not cheap but I think they are well worth the money. My only concern is what happens when the internal battery gives up! Overall they have surpassed my expectations and I am very pleased with them.