I've been one of those with volume problems on my Opus 4 and yet was quite happy with the sound from the onboard Dac and could never really see the need to purchase an outboard unit. I'd already modded my Shanling CD-100 with Burr Brown op amps, a jitter amp kit and upgraded audio caps so I felt it was doing as good as it ever would and was always pleased with the sound. I'm running it through an LS-25 Mk2, swap back and forth between an AR D-115, Mac 275 and HK McShane modded Citation 2 into a set of Cornwalls.
Then I happened to see an original DacMagic 1 on an auction from England. It stated that it was a 220 volt unit and that it worked fine except for the CD input....the other 2 inputs worked OK.
I won it for a very reasonable price and it only took a week to get it. The first thing I did was to open it up to see it if could be changed over to 110 volts or if I'd need a step up transformer.... East Squeezy...one wire change to convert to 110. Then I spotted a solder joint on the inputs that apparantly was missed in production. It was coming directly from the CD coax input. 5 minutes later I was done soldering and the unit was functioning properly with all inputs.
Today I hooked it up to my Shanling first, not expecting much of a change at all since the Shandling has already been pretty heavily modded, including the Western Electric output tubes. All I can say is WOW! My living room almost doubled in size and the instrumentation and vocals can now be pinpointed to within inches instead of feet...soundwise. The tonal quality is phenominal and makes even the modded Shanling sound like a KMart blue light special. I was astonished. I realize that the DacMagic 2 and 3 are supposed to be much better than the original model one, but I cannot imagine having that much more improvement in sound.
I then hooked up the Opus to it......same thing exactly.....wide open, but very natural sound and it puts the stock Olive Dac to shame. Admittedly, I still have the volume problem since the Dac doesn't have an adjustable volume, but I do love having the three separate inputs so that I can use my Polk Sirius for one input, the Opus for another and the Shanling for the third. I also love the fact that it has balanced outputs. Every other piece of gear I have has them except the Shanling, The Polk and the Olive. I'm not using the Balanced outs on the DacMagic yet since I don't have the Mac275 in line, but perhaps it might help with the volume issue.
In any case, I'm thrilled and can only imagine what the DacMagic 2 owners are enjoying.... As for me....I'm quite satisfied with this unit for only having paid $150 for it. I can't wait until tomorrow when I can experiment a little more with it.