Where s the bass?

Try JPS SuperConductor 2 interconnects if you can. The bass is awesome - deep and tight,with incredible resolution.

Several points to take notice of.

You make no mention of room acoustics. Is the room relatively "live" overall ? Do you have any type of absorber at the primary points of reflection ? This would be along the side walls, the floor between both speakers and your seated listening position, etc... By minimizing reflections and absorbing some of the "stray" energy, you will have contributed greatly to an improved soundstage, imaging AND helping to level out the tonal balance somewhat.

Thiel's and Pass are both known for being on the "cool" or "lean" side of neutral. While they may be wonderful products individually, they may not work all that well together. Also make note that all Pass amps sound best being left on continually. If you don't want to do this, at least turn the amp on before leaving for work on Friday morning ( or whenever your "weekend" occurs ).

You made no mention of how your gear is set up. Believe it or not, the type of rack, how it is constructed, where it is located, etc.. and "tweaks" such as isolation and damping devices CAN make quite noticeable differences within a system. Sean
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Sean's post is correct. Walk around your room with the music playing and see if the bass level changes in volume. You or your speakers may be sitting in a bass suck-out location. Consider having your room analyzed to reccomend the best location for you and your speakers. With good equipment its usually the room interface that determines what you hear.

Try putting your listening chair against the back wall. This will elevate the bass level, all other things being equal.

I also recommend you try a REL subwoofer. They are designed to fill in the bottom, without affecting the sound made by your main speakers.