![]() ![]() The Kript and Zetsage both target a 0dB gain with -0.08dB being achieved by the Kript at 39Hz and 80Hz for the Zetsage. Running the device in reverse inverts the gain to -1.3dB. ![]() The PAC SNI-1/3.5 lived up to the advertised +1.3dB gain (+16%) across the majority of the frequency range. The amplitude response of the three devices is shown below. Interestingly, the Zetsage was the only device to reproduce the waveform with a 180° phase offset which inverted at 3kHz! Both the PAC and Kript devices reproduced the waveform with 0° offset after ~100Hz. The generated waveform is Channel 1 (yellow trace) and the response through the ground loop isolator is Channel 2 (blue trace). Digilent's Waveforms software shows the full bode plot of the response, as shown in the run against the Zetsage, below. The three isolators were characterized using a Digilent Analog Discovery 2 as a vector network analyzer with a 2V signal swept from 20Hz-20,000Hz (audible range). The Zetsage seems glued together and did not want to reveal its secrets. The PAC has end caps clipped into the PCB but it possible to remove grommets holding the 3.5mm wire and verify that there are transformer coils inside. The Kript HiFi was the only isolator that was trivial to crack open and is shown above. The Kript product images showed real isolation transformers. The product images suggest that the isolator is not using transformers for isolation. This product was the cheapest of a slew of seemingly identical MPOW clones on Amazon. The ground loop isolator of choice at Crutchfield and claims to have a +1.3dB response. Since two isolators are needed (one for the mic, one for the stereo) three were purchased and characterized side-by-side. However, it is not always apparent from the product listing how the isolator actually performs. Most isolators work by using transformers to transfer the audio signal with a new ground. Ground loop isolators are commonly used to remove noise from improperly installed 3rd party car stereos and can easily be found online. Audio from the Switch with Ground Loop Interference Ground Loop Isolators The spectrogram below shows the unpleasant broadband noise that drowns out the real audio signal. However, doing this in practice results in some nasty noise from a ground loop. A TRRS to 2xTRS splitter can be used to pipe the left and right audio channels to the LINE IN port and the microphone to the LINE OUT port on the motherboard. Similarly, piping a microphone from the computer to the LINE OUT and wiring that to the Nintendo Switch microphone input should also preserve microphone functionality. The LINE IN could then be mirrored onto a headphone jack that is already playing some other music. In theory, it should be possible to take the left and right audio channels from the Nintendo Switch and pipe those to a LINE IN line on a computer. Comparison of TRRS (left) and TRS (right) TRRS and TRS ports and cables can be used interchangeably for carrying left and right audio channels, but a TRRS cable must be used in a TRRS port to carry the microphone signal. Most 3.5mm devices use a TRS (Tip-Ring-Sheath) connector which only carries left/right and ground. The Nintendo Switch has a TRRS (Tip-Ring-Ring-Sheath) 3.5mm port which carries the left and right audio channels, a ground line, and the microphone channel. In theory, it should be possible to run the Nintendo Switch's audio through a computer and into a single set of headphones. Having an ear bud playing sounds from the Nintendo Switch inside of an over-ear headphone playing music does work, but can be painful after a few hours. Some Nintendo Switch games have stronger game play mechanics than soundtracks and it would be nice to listen to other music will still being able to hear critical sound effects. ![]()
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