pre amp basics


does the pre amp play any role in driving the speaker? For example, if I have a speaker that is difficult to drive and therefor I use a higher power amplifier, will the pre amp I chose make a difference in how well the speakers are driven?
what would be the difference between a passive pre amp and one with a considerable amount of gain in terms of driving the speakers and low volume listening?

I have dcm time window speakers. I was powering them with a creek 5350SE, which I returned due to malfunction. The creek was nice except at low levels. I would love to have a combination that is better in that department. Another problem was very fatiguing and harsh highs. I'm not sure what the cause of that is though. I'm waiting on a music hall cd 25 which may cure that problem. It could also very well be the room or maybe the tweeters. Well, that last part was off the original subject but nevertheless it is part of my quest for better sound. Any advice is appreciated. I'm just looking to learn. Thanks.
halil
Thanks for the input Tobias and Elevick. I believe the pre amp question has been cleared up. That will certainly help in the decision making process. Hopefully, with a more powerful amp and some room treatments, I can fix what I found to be problematic in the sound.