Since everyone has already given you their $0.02 on the description of bright and warm I'll answer your other question regarding dynamics and accuracy. These are not mutually exclusive of each other. Yes, you can have both as they are not related to each other in any way. A dynamic speaker is one the can play at reference or higher levels without distortion, compression or otherwise exceeding its limitations in any way. Reference is 85dBs with 20dBs peaks (30dBs for the LFE channel) so the speaker needs to be able to play at 105dBs cleanly to be considered a dynamic speaker. This doesn't mean that it needs to reproduce the source accurately, just that it can reach those levels cleanly.
Now accuracy, on the other hand, implies a neutral speaker. One with a flat frequency response curve. This means an accurate speaker can neither be bright nor warm. So accurate is mutually exclusive of bright and warm. An accurate will add no coloration to the source. What is on the media being played is what comes out of the speaker. Nothing more, nothing less. Hope this helps.