4 Input 4 Output 3.5mm Audio Switch Box, AUX Switcher, Stereo Audio Selector Box, Line Router Splitter Combiner for Home Audio

I've used a few of these fiberglass & acrylic devices and this one is the only that I've seen with 4 inputs and 4 outputs. If you're looking for something this specific, you already know the choices are limited. It's worth noting I had to pickup a buzz box for each input to work with this though. Upon plugging in the 2nd input device, a buzz was occurring and needed the buzz box to resolve that (~$8/ea). Once those arrived, I was able to route audio between two computers ending at either my desk speakers, or over to my headphones with two clicks of the dial.Quick info:Design: no idea why the dials are aligned the way they are, as the dials dont line up with each other. Maybe it's on purpose. Drives the OCD a little bit but does the job.Build quality: its a PCB and acrylic boards with relatively cheap knobs, but assembled pretty well all things considered. The PCB board is of pretty good quality tooAesthetics: you either like this sort of "open" design or you don't. I have it sitting next to a legato Wave XLR and StreamDeck which are very tidy and nice looking. With all the wires on the front and back, it's hard to have this just out and about and not want a little place for it. Suffice to say I'm working on a 3D printed enclosure for this thing because it's not the prettiest. But does it's job and does it well.

I picked up this handy little AUX Switch Box to tidy up my work from home / gaming desk setup and allow me to easily switch between my speakers, headphones, personal computer, and company laptop. The unit does exactly what I wanted it to do, but I did want to confirm that thanks to its simple design you will likely need to add a ground loop isolator ($4-8 ea) for each input beyond your first one.The 3.5mm jacks feel tight, and paired well with the random assortment of 3.5mm cables I've accumulated over the years. The selector knobs have reasonably positive detents, the aluminum knobs feel nice enough, and the overall package performs nicely. It even looks at home next to my inexpensive Bravo Audi headphone amp.My only real gripes are the lack of ground loop isolation on the inputs, and the layout of input and output jacks. It would have been a lot tidier if there were two inputs and two outputs on the front and back of the device to keep my back-of-desk arrangement nice and tidy, but I understand that it would have taken more work to get the PCB to layout nicely.Overall, I'm giving the switch box a 5/5 stars because it does its job, I was aware of the potential flaws with the ground loop isolation, and its affordable as all getout. I could have made something myself, but for this price, why bother?Pros:- Inexpensive- Allows easy switching between inputs AND outputs- Attractive, minimalist packageCons:- Some feedback if there are multiple grounded input devices- Input/Output jacks leave room for improvementNeutral:- You gotta install your own rubber feetRecommended Improvements:- Integrate a ground loop isolating transformer if space permits- Have 2 inputs and 2 outputs on the rear of the switch instead of 4 inputs on the rear, and 4 outputs on the front.

I connect four Morse code paddles to the input jacks and four ham radio transceivers to the output jacks. I can now select any key and radio combination that I feel like using simply by adjusting the two knobs.

I am impressed with the build quality. Knobs have a nice solid feel to them and lock into place at their various settings. Rubber feet on bottom. One of my input synthesizers has bad USB ground noise when combined with other inputs also connected to my PC; same problem when using a mixer. I bought "BESIGN Ground Loop Noise Isolator" which solved the noise issue.

I like the ability to switch between sources without moving between headphones.