Does anybody know what's wrong with Tyler's bass?

The blame here shouldn't fall to the shoulders of the Tyler acoustic monitors, but to the category of monitors in general.

Your gonna need a sub with most speakers unless they boast dual 12's or 15's (assuming you care about music under 35hz)

What you trade off for in the bass department with monitors you gain in soundstage and clarity. Figure your gonna need a sub with most speaker setups (not all!, like Dunlavy or VMPS ~!)

so go from there

Hi Guys,
Thanks a lot for your responses and suggestions.
I eventually found one monitor which denies the theory that monitors can not produce a good bass without compromising clarity. The one is Totem Mani-2 - the flagship of Totem monitors. It goes amazingly deep and still detailed and cristal clear.
I tried monitor-sub combos and found that subs are usually boomi and kill monitors' clarity by this.
The only problem with Mani-2 is that it is a POWER-HUNGRY BEAST.
My Bryston 3-BSST with 175W per channel is barely enough for this speaker so I am considering to go up to Bryston 4-BSST.
Thanks again.

I have to revise this, the active 20's and 40's Paradigm made are awesome. I am sure with bette crossovers the others would sound better as well.

I have to revise this, the active 20's and 40's Paradigm made are awesome. I am sure with bette crossovers the others would sound better as well. The 1801's are as good, but it is important to give credit where credit is due, and Paradigm deserves it for these.