Newbie with "bright" system

I recommend you to take a good look at your system set up ( give the Bryston enough break in time as well) as Onhwy61 suggest. You don't mention your previous amplifier, couldn´t it be that you are noticing the difference between the two (you are used to the previous sound)?
Whithin certain limits you might be able to modify the presentation out of your source playing with shelf materials and footers. What is your metal rack shelves material ? What is the floor/ rack interface cones, soft? Try some soft ones like vibrapods under your CD player they do make a difference. Do you have power conditioning?
If you provide more info, maybe a fix can be found....

Jeff and Bruce, while I wholeheartedly agree with you on the tube advice, do you think it's a good area for a "newbie" to venture? We have tubes in our CD player, our preamp, and our monoblocks are tubes, so we are FANS. The “bloom oh the bloom” ! But,
Tubes take a lot of finesse and can be very finicky. I see this as one of those last tweaks that you do, not one of the first. It could be very frustrating.
I think that a person needs some time and experience under their belt before dipping into the tube realm.
Talk about snake oil salesmen, look at all the tubes that are available; and are the really NOS, etc? I think that folks can be taken more on tubes than any other tweak. This is just my own opinion and welcome others.
regards -

Wemmessie. Since you are now experiencing a slight "dullness" to your sound after room treatment, may I suggest a detailed, brighter, & airy but very smooth ITC? Thanks, I knew you wouldn't mind. Anyway, try Silver Audio Hyacinths. I have had great success with them running from my DAC to Pre Amp.

Sorry Mraybeck, I must defer to the infinite wisdom of other members, I am and for the immediate future committed to solid state. I think though, as a practical matter, you should wait on cabling until after the pre.
Chris

Thank you very much everyone. Wow, I'm offline for awhile and return to this great advice. I used to dabble in hi-fi (mid-fi actually) in HS and college. School and work requirements forced a hiatus. However, I am now re-entering through the back door of Home Theatre (perhaps one of its benefits to HE audio). I just added to 4B ST for two-channel and bought the Arcam (used) a couple of months ago. These changes really floored me and have now sent me on the quest.
I live in a small apartment and my stereo is in a 15'x12' space at the end of the main L-shaped living space. So, I unfortunately do not have room (or money) for a separate 2-channel system and room treatment options are very limited. The floor is carpeted and there is a lot of soft furniture in the space. The walls are plaster and there is a marble fireplace at the first reflection point for my right speaker. I know, far from optimal, but there really is nowhere else in the apartment I can move the system. I have experimented with speaker placement and toe-in with some success.
The rack is an industrial metal-wire rack with flat feet (no cones) and I am not using any dampening/isolation devices. I am using a Monster Power HTS-3500 for my CDP and receiver (pre), but not the 4B ST.
So far, I am leaning towards some HT truthlinks as an interim change until I can afford a decent rack and then a pre. For the time being, money is pretty tight, so I hope to make incremental, high-value changes through research and the experience I have found on this site. I'm grinning with the knowledge that my modest system has a LOT of room for inprovement. Think of all the CD-pulling, listening sessions I have to look forward to after each upgrade! (helps ease the wallet sting:)
Any additional insight/suggestions on the path of musical fulfillment are warmly received. Any advice for this 'yung grasshoppa' on how to keep this hobby from becoming a financially-draining obsession that alienates me from all friends and loved ones - or should I just make peace with this right now? Happy Listening, Mark.