To tone control or not to tone control


I recently stepped up to a Conrad Johnson PFR preamp to mate with my CJ MF-2200 amp (200 wpc). Was previously running an Adcom GTP-450 pre/tuner which had bass/treble controls which help to compensate for those recordings which are recorded poorly. Though the CJ PFR sounds really good on most of my cd's there are some of my favorite artists whose recordings are really pitiful. Is there a good tone control which I can use on the PFR to use for these poor recordings? Is there a way to connect both preamps to one system. I do have an older cdp that I could connect to the Adcom preamp for the poor cd's and use the main system for the good stuff. I have also thought of trying a subwoofer to help with filling in the bottom end since most of the poor recordings are R&B and Rock N'Roll and that is where they seem to be lacking the most. The rest of my system consists of a Sherwood Newcastle 980 cdp and Infinity RS 5000 speakers (12 yrs old) and next to be replaced. As always your help is appreciated
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I understand that tone controls add distortion. You are right Greg when you say that the system is more revealing now. This started with the addition of the CJ amp. However I am using Sorbathane isolation pads with cdp , and have replaced ic's with Wireworld Solstace-lll. The speaker cables are Monster Z-1. Certainly there are more expensive & better cables but I did check reviews before buying them. The cdp is not the best but it does have dual 20 bit Burr-Brown DACS. Was going for a higher end on it but decided to wait out the format wars before spending a large amount of money. Speaker placement may be somewhat problematic but in HT mode I can just about rattle the windows without a subwoofer. The problem then seems to be the source material. Most recordings sound great but the few that sound bad sound extremely bad. Again this is due to the very revealing CJ amp. My choices seem to come down to this. Don't listen to these cd's again or doctor them so they are fit to listen too. It is amazing how a little extra bass can fill in those areas which are lacking. It is not pure to the original recording but it may be that it sounds closer to what the engineer was trying to accomplish but did not have ability or equipment to do. That said I will probably try your suggestion Bruce. For the purists who read this please understand that this fix will be used sparingly and under duress. Thanks all for your advice. BTW I am very impressed with the CJ equip. It has given me enjoyment of musical genres which I previously had not enjoyed
Enjoying music is what counts -- so do try Bruce's suggestion before U spend mega $ on the likes of Cello. While you're at it, also try the cdp w/out isolation; it might help the bass...
And don't worry about purists: we're all in this for the music (methinks). Cheers!
Thanks Greg. Your comments have been insightful and helpful. As for my comments about the purists, they were meant for humor and not for insult. Hope no one takes it the wrong way.
I have two preamps. One a straightline low output MC preamp with separate transformer, no on/off button, no tone contros, no balance, one phono, one tape loop, only a variable (and defeatable +4 dB bas eq). It's a Biotronics Gestalt. The other preamp is a Proton with bass eq, loudness, bass, mid, treble, elrctronic crossover, dubbing, etc.

My opinion? Wish the Proton sounded as good and clean as the Biotronics!!!!! Would love to have that clean sound combined with flexibility. Closest alternative? Van Alstine's FET Hybrid preamp w/tone controls...