First: FYI, 120V network as a whole, is a lot cheaper to install, outlets are smaller more discrete as you know and cheaper, electric panels are cheaper, it is a lower voltage hence "SAFER" for domestic use, and there is only "ONE TYPE OF UNIVERSAL PLUG" that fits all oulets, as opposed to :

220V which is a mess when it comes to plugs with (3) flat bars, (2) round pins, need for adapters, sometimes not fitting ugly and bulky outlets... it is absolutely archaic, the entire network is a lot costlier to install, and is more dangerous for chocs.

Second: every small transfer you buy, there is a sticker on it that says "not intended for audio equipment", i.e. all 120V items like computer mini-subwoofers, amplifiers, even 1500W hairdryers, etc. won't work on small transformers which are only good for electric shavers. For audio, there are special transformers which are much more expensive, but in the end, not guaranteed if they will be ok for audio & video equipment.

Laptops and electronic camera chargers are safe cuz they are all designed for dual voltage 120/220V.

Moudir