I agree very much with the above!
Wow, COOL insight on the AC/DC recordings! I was just listening to the George Marino remasters of Powerage this morning. I have nearly all of them and really appreciate the excellent job George did on those. I always listen to about 20-30 minutes of music before breakfast to get my mojo on line. Post a cup of coffee of course.
yeah, that whole site is great, theres a couple of hundred interviews with some really top producers (including my boss's!

) as well as studio tours etc, plenty of GAS to be had!
I am really doing my best to wrap my head around four different highly rated devices.
1) The Gas Cooker
2) Reddi
3) Tech 21 RBI
4) The Distressor.
I understand now that the Reddi HAS to be used with a separate preamp. I could use the preamp already within my E-MU 1616m card.
E-MU XTC™ Class-A, ultra-low noise preamps (-129.5dBu) - Mic/Line and true Hi-Z inputs via Neutrik connectors, with analog soft limiter, 48V phantom power and 60dB of gain.
These have a lot of gain so I am certain they would be ample. If you were me, would you just forget about the RBI if I purchased the Reddi?
The Reddi appears to be an unusual device. It seems to be more of Direct coloration device. Is this true?
If used, should the Reddi always be just post the bass guitar itself? What if the Reddi were used in conjunction with the Distressor? Should one REALLY be even considering using the Distressor in conjunction with a DI? I was reading on the forum yesterday where some very experienced bassists were stating that they never or rarely used compression prior to recording their bass direct.
yeah, you are looking at a few different bits of gear so confusion is bound to be abound! The gas cooker is a pre/di (though you can get a di only version, I have never seen it in stock at any store, or even listed by most). Its is a colouration device of sorts, it has the same outputs as a DI, ie a thru and a balanced out. it also has a line output, so you have a choice of how to use it,
1- as a normal DI, thru to amp (or not used at all) and balanced (front panel) output to your pre amp.
2 - as a pre amp, coming out of the back panel LINE output. this would go to the line input on your emu and avoid the preamp, this would probably yield the best results as the gas cooker pre is great. your line input is 1/4" jack, i guess, so you would need an fem.xlr>jack cable to do this, if you go into the xlr in of the emu you are just pushing it through another preamp, which can be a bad thing.
you can also put mics into the gas cooker and while it doesn't have bags of gain it does sound great. These preamps will be a LOT better than the ones on your emu, so you will be getting a triple deal of great Di, great bass pre and great mic pre, all X 2! the cons, well, price and also the box is quite coloured in general, if you are not into the boxes sound then it its hard to avoid it, but I love it and being into the music you are I'm sure you will too! Note, by coloured I mean a recording gear kind of way, its subtle compared to an amp or similar but noticeable.
the reddi is a di with some colouration, its kind of like the ridge farm but just the normal DI with gain boost bit, no mic pres and no line output, so you would still have to go into your emu pres. sounds great, though and is a lot cheaper!
the tech 21 is a di box with some amp modelling stuff and I think it has a line output, so again you can bypass your pres. it is probably the most flexible of all the devices you mention and it has by FAR the most tone colouration options. its an amp sim, really, and can be used as an effects pedal too. a good box, very versatile and I do sometimes use one to grunge up a di track recorded with a ridge farm or similar, if i get to the mix and need a bit more grit. I don't use one as a recording pre though, because I have the ridge farm

This would be my last choice on the list, nice to have around but far from indespensable and doesn't have the pedigree of the others in terms of sound. You may find the tone shaping is just what you need, though.
the distressor is a compressor, full stop. its not at all like the rest, and it will not remove the need for you to preamplify your bass etc. it accepts line signals, as in after a preamp, and squashes them with skill. the distressor is a little boring to my ears in normal mode, but in either of the distortion modes it sounds great. Its worth noting that distortion doesn't sound at all like the name suggests, its subtle and very dependant on what the compressor is doing so it requires a whole other, a bit more advanced, approach and understanding. it sounds great.
however as walter bush says, if you are in the market for a GOOD compressor then there are a lot of VERY inviting options, if you want a compressor don't think that the distressor is the only one for you, in that price range you are getting very much into pro audio and there are some really really great compressors out there. if you really want a compressor rather than the others let us know and we can suggest more!
If you are not very comfortable with using a compressor I would ignore this option for now. using compression on 'the way in' is normal for big studios and experienced engineers but can lead to problems if you are not a dab hand. for that reason you normally see people advising against it for less experienced users, compression is a destructive process rather than tone shaping (like the other options you mention) and can not be undone!
24-bit/192kHz converters - the same A/D converters used in Digidesign's ProTools HD 192 I/O Interface - 120dB signal-to-noise ratio.
In a brutally honest sense, what about the RBI? Considering the other devices I am inquiring about, including the mic pres on my card, is this Sansamp just a glorified DI "stompbox" waste of money?
Thanks!
be wary of the A/D specs, for example most A/D's can work at 24/96 these days, it means nothing really, as its HOW WELL it captures those samples that counts and that varies considerably. The actual A/D stage may well be the same as a digi 192 but i'm sure the clock is not, and the clock has a big effect on the sound of a converter and, unfortunalty, a good clock is expensive! I don't know about specs but I know our 192 cards sound great, and if the emu's sounded as good then you would get studios packed with emu boxes running as aggregate devices just for the a/d section ( a 192 is just a/d's really, there is no real volume control, just line inputs and outputs.)
I'd go for the ridge farm, then later the distressor. (the most expensive, I know

) the ridge farm allows you to get your bass amped up and also get two great pre's for mics (much better than the emu stock pres). the A/D's do not matter that much yet, as mentioned before they don't have a make or break impact on the quality, though the are important to squeeze a little more clarity out of a good recording.
I think that may be my longest ever post! phew! I'm very much enjoying this conversation though, its nice to have such a good, in depth discussion, I always find myself having to question what I know in case I post something silly, this is a very good thing!