The ART D-I/O DAC that was hugely popular a couple of years ago had a very high output. I think it was possibly even more than 5 volts. There were lots of mods performed on these too.
Monarchy audio 22A/B/C. It has internal jumpers to configure for low or high output voltage. The high setting is very high. I use the low setting to give better volume control on my preamp. It's a pretty nice DAC, too, provided it's fed a low jitter signal.
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