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I'm not familiar with Rotel products, but I'd suspect that they are a solid product. I would probably look to upgrade the speakers, but really think your problem may be more related to subwoofer integration than any specific component. I "cheat" and have a receiver with Audyssey built in that does a great job of calibration.
Your speakers are spec'd such that they should easily have enough range to blend with a subwoofer without leaving a "hole" in the sound. I wouldn't expect a new amp or pre-amp to correct this.
You could consider going to a receiver with Audyssey, but I don't know how much of a step down that might be from your seperates.
How much time have you spent integrating the subwoofer?
I agree with Metralla. Try moving the sub as well. Have you played with the crossover settings and volume on the sub? Try setting it lower, ie move from 80hz to 40. I would bet that your best results would be eliminating the sub, finding the best location for the speakers and then hooking the sub up to the second set of pre-outs if there are two sets of outputs. Then, slowly bring up the volume on the sub while running it full range. You won't have a gap at all and just have to avoid too much overlap.
A tube amp won't help your problem.
What is your goal? If you want to listen to 2 channel music then your thinking tubes is good but that doesn't exactly fit with your speakers. In the end you will likely end up having to replace everything but speakers first would be the way to go. Listen, listen, listen to a lot of different makes and models.
Thanks for the response everyone. The gear seems to handle TV decently, but I was honestly really disappointed when doing CD playback. I have moved gear around, but am a little limited in terms of placement due to the room layout. Here's some more info:
Actual Room Footage: 306ft
TV Area = 195.5ft
Kitchen Area = 110.5ft
My gear is being feed directly from:
Samsung BD-P1600 Bluray player (connected via RCA)
Motorola DCX3400 Comcast Box (connected via RCA)
Floor is carpeted (nylon?) with another medium sized wool carpet on top
Window Drapes 75% the right side of the room
Kitchen on the left side of the room (roughly 36% of the room)
5.5ft long leather Sofa 4.5ft directly away from the front of the speakers
XT8 Speakers separated 5.5ft from each other and angled 25% towards the center. Unfortunately they are only 0.5ft away from the wall. It will look very cluttered if I move them too far away from the wall.
PV1 is situated on the right corner of the wall angled 25% towards the center on front of the right speaker.
Current PV1 settings:
The PV1 does have phase shift and is set to the standard setting "+" (0 degrees), the crossover point at 80hz (sometimes 60hz), bass extension at max, and volume at 1/2 or so. Overall it sounds like it's working properly.
You really need to play with speaker placement and sub placement and settings before you consider buying anything IMO. If the problem is the room/placement, nothing will fix the problems. You'll just throw more money into a never ending problem.
I've been there once or twice. I'm more of us than care to admit it here have too.