The switching of HDMI signals is really handy and works perfectly. Power consumption is minimal. The selector accepts all standard "TV", including 1920 x 1080 progressive scan 24P and 60P same! For people who only make switching, the selector can be used as a simple repeater for very long HDMI connections (tested 10m + 15m + switch between the Blu-ray player and projector). The camera also accepts without problems the signals off TV standards used for computer screens. It is possible to transit simultaneously by the selector two separate HDMI signals, one being directed to the output A (projector) and the other to the output B (the PC monitor or Raspberry). There is an analog stereo audio output. It is associated with the output A. The only disappointing concerns precisely the analog output: On the copy in my possession, the left channel outputs a signal 4dB lower than the right channel To correct this you must open and edit the device ... it loses the warranty. It is only useful to people using this analog audio output. For other refrain! This weakening of 4dB is the result of a design error: the left channel is loaded with a 1K ohm resistor which is not present, or even expected, to the right channel. In addition to unnecessarily load the DAC output and lower the signal level, this resistance reduces bandwidth at low frequencies (-3dB at 30Hz). We must therefore remove. This is a small surface-mounted component, identified "R1", placed near the RCA jack left channel. For desoldering, simply alternately heating both ends with a small soldering iron, while exerting a lateral pressure on the component using a small screwdriver or punch. If the resistance is broken, not matter because withdraws! That's all for changing the hardware. Another flaw concerns a slight noise at low frequency background especially noticeable when listening on headphones. This slight "hum" at 50Hz is only present when the video is active. The only solution for perfect audio is to dispense with the screen display once constituted playlist and started. Turn off the monitor's power is useless. Probably the HDMI demodulation circuits of the monitor are powered by the cable itself. But there is more simple, just connect the monitor to continuously output B selector. When one wants to have the same image and sound, it sends the signal to the relevant input, simultaneously to both outputs A and B. When does the audio with perfect quality, for selecting Exit B, any unused input. Of course the image disappears from the monitor, but the "noise" too! The small remote control is useful when the switch is away from the PC. In this configuration, the audio quality is really excellent, both listening to measures. The DAC used is identified "344c", this is probably a clone cs4344 Cirrus Logic, impressive performance. The following measurements were performed on a PC using the software "Spect & Gen" and a THX Sound Blaster ADC "TruStudio PRO." Here the level of the harmonic lines with respect to the fundamental to 1KHz, the maximum level. Harmonic 2: -94 dB Harmonic 3: -86 dB Harmonic 4: not measurable Harmonic 5: -87 dB 50Hz residue: -74dB and 59dB without video when the video is active is the only weakness. Speakers on this "noise" is virtually inaudible, but it is somewhat annoying when listening on headphones. It is reflected in the low level of musical passages. In this case it is better to move the image, as described above.
