Cubetek 3 in 1 LCD Display V5.0 Bluetooth Transmitter Receiver, Bypass Audio Adapter with Aux, Optical, Dual Link Support for TV, Home Stereo, PC, Headphones, Speakers, Model: CB-BT27

Connecting the device to my tv and speaker box was a breeze. Basically 3 types of connectivity receiver, transmitter and bypass. Bypass connectivity is very useful optical to aux (headphone out) or aux to aux all were digitally controlled as the device was able to detect the connection types automatically. Mobile or any bluetooth to the speakers (via aux) were fantastic with better sound quality for personal use dont expect audiophile qualities but perfect for home use. Have to try digital to digital (optical to optical) to see any difference in audio quality but as i told earlier no complaints for general home use. My only regret is it doesn't have a digital spdif coaxial (non optical) and HDMI input options which would have opened up a new world of possibilities but for the price no complaints.

Been using this for over a year now and i can definitely say that it really delivers. It helped me convert my old 5.1 to bt and the main advantage is that it has optical output which makes the home theatre experience much enjoyable and the lag is nonexistent as my video and audio source is right on top of the product but i do occasionally have some drops when listening to music but i doubt that is due to the power supply as this product requires 5v2A power adapter and mine is a really old power adapter so i think needs to be changed

I got this to add-on to a high-end system, which traditionally doesn't have the facility. However it's often requested when guests come over. I was using a Phoenix transreceiver, but the constant need of charging and the single indicator LED made it difficult to integrate into this kind of application. The optical out is connected to a dual ESS9028 DAC, and the device used for transmission is the iPad Air.This lacks a battery, which is a big differentiator. This means it is not exactly portable, and the form factor reinforces that 'feature'. It is intended to be a desktop unit, and it comes with a reasonable set of cables. The quality of the included cables is quite poor, so it's best to use something else.Compared to the direct input from USB, the overall sound is poorer, with a shrunken soundstage and coarse vocals and treble. Still, this is being used in a high-end system - I suspect with many lesser speaker/amp/DACs it will be acceptable. At maximum output, the level is about 1-2dB lower than a direct USB connection to the DAC.It is around the same as my Signature Acoustics unit, which is 1/3rd the size but uses a battery, and doesn't have a volume control or the bypass feature, or the nice display which is handy if you are close by.The bypass is one of the highlights of this device, it basically connects the two optical ports together in passthrough, and allows you to use both BT and another optical source/receiver - though only either can be used at a time.The build quality is average. It is lightweight enough that a set of decent cables will tip it over backwards, hence the thin cables supplied. The onboard volume control is nice, if a bit redundant given everybody uses their handheld or other device to control volume (I use the DAC remote). It also has only 16 clicks, so the control will be very coarse. The display has no spelling errors and while the resolution is low, it is sufficient for the tasks.Overall, it's quite expensive but is more kitted out than similar devices. The sound quality limitations of BT transmission (compulsory resampling and lossy compression, among others) cannot be overcome even with the fanciest devices and protocols, so I'd rank it close to the top of what you can get as an add-on for a hifi system. For more 'normal' usage, there are cheaper options available.