Here's my "War & Peace" novel on the subject . . .
The latest instrument amplifiers to come out in the past year or so are getting a lot better . . . and the crappy ones have been discontinued, mostly.
Lately, I've been seeing a lot of lower-priced mic pres that are built around the newer burr-brown chips. A really simple design that incorporates the Burr-Brown INA163 instrument amp should be able to get you perfectly good results without having to break the bank. Two of them that come to mind are the
M-Audio DMP-3 and the
Rane MS-1B.
One of the nice things about these designs is that the newer chips don't have that brittle sound that the older ones used to get a bad rap for. I asked Scott Dorsey about this, and he mentions that the older chips that most of them used to employ -- the INA2017 -- had an excessive amount of high frequency distortion that the published specs kind of left out. And for those of you who don't know, Scott is one of those dorks who just kind of knows everything, so I trust him in these matters.
Secondly, in the simpler designs, you don't necessarily have to have a lot of juice -- so wallwarts aren't as much of an issue, apparently. Although know-it-alls (read: Kurt Foster) seem to be convinced that all wallwarts are evil, etc. etc.
The only thing you might have to concern yourself with is the longevity of some of these things. I'm not going to profess to be an expert on electronic components, but most of my techie-type friends and acquaintances seem to be concerned with the fact that most of these cheap designs are using cheap capacitors. One thing you could do is swap them out for better ones after a few years or so -- or you could just take your chances and ride them out untill you can afford something better.
Another bit of knowlege I gleaned after talking with some of the senior designers at Summit Audio . . .
The A-#1 factor that makes one of the boutique-ish mic pres unusually expensive is not the quality of the components or the complexity of the design.
It's simple economics. Any of you guys who are or have taken some intermediate econ classes should understand the idea behind economies of scale.
Now consider that most of these boutique mic pre manufacturers are pumping this stuff out on a very small scale. Some are even being made by hand. Knowing this, and understanding the market demand and equilibrium pricing, and distribution forces that are going to apply . . . who do you think can produce a piece of equipment less expensively? Focusrite . . . or Davisound? Mackie or Manley?
Obviously,
Focusrite has some advantages of mass distribution and economies derived from their scope and scale.
We should all know that it is much less expensive on a per meal basis to feed a hundred people than it is 4. Why? Because you can go to Sam's Club and just buy everything in bulk . . . which lowers your per-unit cost on everything. Same thing with Focusrite. Every single component they use can be bought in mass quantity, which brings it's cost down significantly. Furthermore, labor, marketing, and all other costs are divided amongst thousands of units rather than a few.
Same thing with R&D. Who can better justify spending more in this area? Someone who can spread the cost over several hundred thousand units over a year, or one who has to divide it up over a thousand or so over a few years?
I'm looking at my Sytek
MPX-4A sitting there in my rack right now. And I figure the casing on this thing must have cost the manufacturer around $200-300 or so. Just for the housing, never mind the parts inside or his labor putting it together. Now I'm looking at
my M-Audio DMP3, and I'd estimate the housing on that thing to have probably set Midiman back maybe $5 ? ? That's partly because it's housing is cheaper, but I'd also bet that M-Audio could probably pump out the same exact housing as the Sytek uses for maybe $25 to $50. And that's just because of the advantages they have due to size and scale.
So think about it from an economics standpoint, and ask yourself what you're paying for? Are you paying for a good design . . . are you paying for the fact that it was hand-made . . . and how much of your total expenditure is going towards the quality of components and how much to the external case, power supply, etc.?
And to what extent are you subsidising less-efficient business models, manufacturing processes and distribution methods?