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What I don't get, because i'm new to all this stuff is, what are the options that say medium gain and low gain and then have 110v and 220v next to each. If i were going to use this with the 58x's what option do I get. No matter how many videos I look up none of them explain this. Can someone please help me lol.
110V and 220V has to do what your wall (from the power company) gives you. If you use a 110V unit in a 220V wall outlet you will see a puff of smoke frying everything instantly.
gain has to do with the audio signal. If it is loud enough x1 gain best. If it isn't quite loud enough try 2.5 or 3.3 gain. If for some reason you can't hear shit use 6.5x or more. For highest sound quality, always use the lowest gain setting that makes things loud enough for you.
(using k7xx and 6xx -not hard but also not super easy to drive headphones)
the version you should buy depends on many things. I wish I had x1 gain with my new DAC which has 2.1Vrms (haven't seen DACs go much beyond that ). With my previous set up (using pc motherboard), x2.0'ish gain was needed for sure. Worse DAC's/setups/hard to drive headphones may need the full 6.5 gain.
What happens if you use a 220V unit in a typical American outlet? They only had a few units left and only a 220V model so I snapped it up, but now i'm not sure how to proceed
I'm not certain if this device specifically will have issues, but I do know that a lot of devices that have explicit voltage requirements will have issues if you plug them into an outlet incapable of supplying the correct voltage.
There are currently still 110v units in-stock (at the time of writing), they're just the medium gain version. According to the JDSLabs FAQ (who have their own version of this amp) (FAQ link: https://www.jdslabs.com/faq/), you should choose the gain of the amp based on your audio source (ctrl + f "what gain should I choose"). Most people are probably going to be using this amp with a decent DAC, so in that case, you should just pick up the 110v medium gain version of the amp which is 1.0/3.3x.
Best case would be that you'd get a +/- 7.5V voltage swing instead of +/- 15V (significantly reducing the power ratings). More likely it'd struggle to deliver any meaningful current/power at all because the psu of the amp is trying to regulate to +/-15V when all that's available is +/-7.5V. Perhaps not even enough current to get the op amps energized. I'd have to look closely at the schematics to be sure but that'd take a lot of work >.>. Simply put, don't do it.