Firepod Pre's, FMR-RNP, A Designs Pacifica
I have an FMR RNP preamp (approx $475 - two channel) and just recently bought a rather expensive A Designs Pacifica (retail 2K+ - two channel). In my opinion, you might be better off putting your money into a really good microphone(s) than upgrading to the expensive preamps. I have noticed huge differences with microphones, less with the preamps.
With all tests below, I was using Grado headphones ($180.00) to listen to the differences.
I just got the A Designs two weeks ago, so these tests are still ongoing..
Here are my observations using an AT4047 mic (approx $500.00) on vocals.
The Firepod had the 'darkest' tone of the three preamps. I actually quite liked that..not a bad thing in this digital age. It was less detailed on the high end and had noticeably more bass. It was surprisingly up front and 'present', and beat the FMR on this account. However, on fast transients and peaks, it seemed less able to tame the peaks, so that the sound was a tad harsh (same with the FMR). A small bit of compression would help with this. The Firepod preamps had the least amount of 'air' and spaciousness of the lot. I don't want to say that they sounded 'dead', but definitely 'deader' than the others. This is perhaps the biggest difference. I haven't done overhead drum comparisons among the three preamps, but my guess would be that the FMR and A Designs will pick up room ambience better.
Then again..am I going to notice this difference after a bunch of reverb, EQ etc is added to the final mix? Maybe.. maybe not.
I must say that with lower volume vocals and with a Jim Morrison/Lou Reed-ish delivery, the A Designs just smoked the other two.. the vocals completely engulfed the headphones..With louder 'rock' vocals, the differences were less dramatic.
With bass guitar using Direct Inputs, again, the Firepod had noticebly more bass. However, it was not as tight.. slightly 'muddy'.. but not unpleasant in any way. The A Designs was more focussed and tight. The FMR was somewhere in between the two.
With a drum machine going direct in, again.. the only really noticeable difference to me was the low end.
I did a quick test of electric guitar going direct in, and this was the hardest to distinguish.. however, I really need to mic a guitar (acoustic and electric).
The Firepod costs $300-500, has 8 mic preamps, a bunch of other features, and Digital to Analog (and vice versa) converters all in one package. You can spend 2K on JUST A/D converters. It is quite possible, and probably true, that my complete chain from input to computer is not up to par with the quality of the A Designs preamp. Thus, it can only improve my sound so much. Right now, I would say that it is not two thousand dollars 'better' than the Firepod preamps...
As a note..our band recorded our first CD using just the Firepod and FMR. The engineer had nothing bad to say about the wav files. When I told him I saw a good deal on an API 3124 on Ebay, he said don't bother.. your tracks sound great the way they are (So what do I do.. buy an A designs

...
I am slowly learning, as with other home recording enthusiasts, that the road to the big studio sound is a long and expensive one.. and one that I will most likely give up on.
Hope that helps..
K