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Hi guys, I bought the 220V version of this as a combo with the 6xx on Black Friday. Problem is that I live in the EU where the grid operates at 230V/50Hz, while the power adapter that came with the O2 Amp is 220V/60Hz. I asked Drop support already, but they're absolutely useless ("we don't know"): can I just use a regular US/EU-plug travel adapter? Or do I need some more specialized piece of equipment to convert it? Honestly, I thought they'd be able to send a replacement unit that does 230V/50Hz, but no luck. Or if someone can post a link to a power adapter that works with the O2 Amp for the EU. Thanks.
The 220V just means it's rated to change 220VAC down to 12VAC. With 230V supplied, it'll be a tad higher around 12.5V which might actually be better for the amp. So take that as a blessing. The 60Hz vs 50Hz in this case I almost want to say is a typo if that is printed on the adapter. Isn't EU and like anywhere that supplies 220+ 50Hz? Anyway, for this use 50 Hz wont' break it. 60 Hz helps performance but not really unless you're really pushing the amp to the limit.
Power ratings (110v or 220v) are usually rated for an additional +/- 10% tolerance meaning that something rated at 220v should... in theory be able to handle 242v.
Yes, I understand that. It's the (relatively larger) difference in frequency that bothers me.
AC/AC adapters are purely passive devices. The 60Hz printed on it is almost meaningless. You feed it 60 Hz it outputs 60Hz. You feed it 50 Hz it outputs 50Hz. You feed it 240 Hz it outputs 240 Hz. The important information on the adapter is 220V AC to 12V AC and whatever the output current rating is (the higher the better but has massive diminishing returns). Sometimes instead of printing the current rating it just has the power rating - and once again the higher the better but diminishing returns.
The frequency difference isn't really an issue for the O2. The ripple voltage on the capacitors before the linear voltage regulators is just a little less with 60Hz than 50Hz. The voltage regulators have 80dB or so PSRR shrinking the ripple by like 10,000. The OP amps (which the O2 uses purely), also have about 80dB PSRR (power supply rejection ratio) which basically means it's impossible to hear the difference between 50Hz and 60Hz being supplied. I'm not even sure if it's possible to hear the ripple in any scenario. If anything you most certainly don't hear a difference between a 50 Hz ripple and a 60 Hz ripple.
Depends on how the power adaptor works. This shouldnt matter as most power adaptors don't care about frequency. The rectification ends up with it as DC voltage anyway and anything prior to that is usually transformer which just needs some form of AC to function with a wide frequency acceptance.