I also wonder, thought not to open a new topic:
I bought (used) at853 uw mics plus homemade battery box
(and have Edirol-R09HR)
I wonder if you think CA-11/4 or SP-cmc mics would be upgrade, or doesnt make sense to buy?
Or may I need only a CA preamp? I wonder if I could hear any difference with a preamp than a simple battery box?
May I'd try bass roll off function, since I have some recordings that has much bass...
SP-CMC-4 is the same thing as the AT853s you already have. The CA-11 is a downgrade to those. Some people like the CA-14 more than the AT853s you have, but in my view (having owned a whole lot of mics in the past few years) I wouldn't throw money at the difference between the two.
Unless you record lots of acoustic shows, I probably also wouldn't throw money at a preamp either. The -HR has pretty decent line-in and at a loud show you'll notice little difference.
What I would do, if I was serious about upgrading my recordings, is (a) get better at using post-processing software - unless your recordings are distorted (not merely bassy), bass and mud can be removed in post, (b) practice getting better placement in venues (and if you are stealthing, optimizing your mounting technique) and (c) save your money until you can buy mics that are a LOT better than what you have. IMHO the next most logical upgrades are both AKG solutions - either the ck9x series "actives" which can be found used from time to time here, or the forthcoming ck6x actives + tinybox solution that Naiant is working on, which will be a huge upgrade in this category assuming it works as advertised.