I've never tracked through a real Manley, so I have no real-world comparison. I love the sound of the Manley Voxbox emulation. I have the 1073, the 88RS, the API Vision, and the UAD 610.
I've used the API and the 1073 the most. I have a Cathedral Pipes Notre Dame mic, and had been using the 1073 on that mic as the pre-amp when doing vocal takes. I was finding I had to do more post-processing EQ on my vocals than I wanted. I grabbed the Manley and it changed everything. For my voice, the Manley and Notre Dame combo works well. Given my voice, I 'll take all the help I can get!!!
I haven't tried the Helios yet. I feel pretty good with the API and 1073. I'm getting a feel for the Manley. I'm still pretty inexperienced with the 88RS (although I've had it for quite a while). I keep telling myself not to buy anything else until I know I need it. I want to try the Helios, but .......
That Cathedral’s a nice mic!
Like you, I have the 1073, 88RS, API Vision, and UAD emulations as well. I’ve tracked quite a bit through the hardware VoxBox. It has a velvety richness that’s gorgeous, a pleasure to hear. On the other hand, there’s not a lot of gain, so it isn’t my favorite choice with, say, ribbon mics.
The strange thing is that this velvety tone doesn’t sound highly colored; it’s just...nice, rich, perfect. Especially with a good female session vocalist. It doesn’t add the fatness you get pushed with, say, a 610. It stays sweet all the way through its range.
The emulation is close, though. Just missing that one little element that’s hard to put your finger on, but you know it when you hear it.
The Helios emulation is just great with certain voices and sources. I love it on acoustic guitar, electric guitar, bass, and male vocals. I don’t know how close it is to the original, since I’ve no experience with the original.
I’ve tracked a lot through hardware 1073s and APIs; the general emulation is pretty close, but again, the hardware does something pushed that’s hard to emulate, and of course, with the 1073, and to a degree the API, that’s where the magic is on those classic preamps.
Bottom line, though, is that I really, really like the UAD preamps, and the Apollo is a great interface. I suppose the question isn’t whether these things sound just like the hardware, it’s whether they sound good in and of themselves, and of course, they do.