Where is my weakest link?


Just moved back to my newly remodeled home, finally got to hear my system again. My system consists of:

Sony SCD-777ES
Sonic Frontiers Line 3SE (Siemen 6922)
BAT VK-150 (stock Sovtek 6SN7)
Sonus Faber Amati Homage
AQ Diamond X3
AQ Clear X3
Cardas Golden Cross power cords

My room is 14x18 with speakers on the short wall, about 5' from the back all. I have very LITTLE bass. I have moved the speakers to 4' from the back wall to experiment, but no big improvement. I lost more bass when I pulled them further out of the back wall as expected because of 1/3 node cancellation.

I know Cu interconnect will give me more bass. Short of changing all my cables, what else can I change to improve bass without losing the transparency? I know Siemen is known to be on the lean side, should I start there or the 6SN7? Thanks for the help.
semi
I second the thought on placement. I have been trying different ones over the past three years and have only just found what I consider the best so far. The second-last try imaged well but had a midbass hump and no low bass; a new placement took care of both. Frustratingly, the latest greatest speaker position was an accident--happened because kids overnighted in the listening room and the speakers had to be moved. Never underestimate the value of kids.

Getting the rack out of a corner node helped too.
I'm with Marakanetz. The Amanti's have possibly the best sound I've ever heard from about 100 Hz up, but they quite simply don't have much bass. IIRC, they only have two 8" woofers, which just doesn't get it done for me.

Other than adding a sub or changing speakers, you might consider a SS preamp first and possibly a SS amp as well.

But as good as the Amanti's sound, they just don't have enough authority for me, and it doesn't sound like they do for you either.
Second with the cable interconnect and especially power cord and power conditioner.