My Sonus Faber Amatis have weak bass even though I'm running ML 536s--800 w/ch into 4 ohms

Do you have other amp ? If you do try it. Maybe something is wrong with the amp not speakers or speakers placement.

@torke - need more info

1. What’s your audio chain electronics+speakers
2. What’s the size of your room WxDXH?

Naim nd5 xs2

Nordost heimdall 2 rca

classe audio cp-800

Nordost Heimdall 2 xlr

mark levinson 536 monos

Nordost Heimdall 2 sp wire w Nordost jumpers

sonus faber Amati traditions

2x KEF KC62

AC - Tara labs and audio quest. 

I own Sonus Faber Amati Traditional. There is no lack of bass or treble. I power them with ARC 160 amp in triode mode... so 70wpc. I seldom see them using more than a watt or two... sometimes ten at peaks. I can turn them up far beyond where I ever would want to listen and they are clear and non-compressed.

A couple things. I took off the little plate jumpers and put in high quality ones. I noticed a lack of bass once. I was going to reposition the speakers to improve bass, when I realized one of the jumpers have come off and one of the woofers was not working. I put it back on... bass deficiency went away.

Have you owned audiophile speakers before? Just wondering... audiophile speakers are designed to accurately reproduce the sound they are given... not to accentuate it... some speakers are designed to be very hot on top and overdo the bass. Just wondering about your expectations.

Just for fun I recently decided to completely redo my speaker placement. So I started with them a couple feet from the wall (the location that reinforces the bass) and worked them out until they were five feet out. I will say they really sounded great in all positions with only slightly more bass close to the wall. I ended up with them in the original position, about five feet out with no toe in... allowing them to disappear and cast a soundstage about eight feet back and beyond the speakers on each side., 

These are exceptionally natural, musical speakers which do not need enormous amounts of power to sound spectacular across the audio spectrum.

I guess we need more information from you. Your complete system with photos in your venue... create a virtual system in the area to do that... and we can probably help. Also, a little history of you and the music you like would br really helpful.

Living room 18x16x9

but room has two pillars on one side then a hall way. Which makes the room 18x19x9. And then open to kitchen with half wall. Which makes room 30x19x9. But one corner has a 45 degree corner for a fire place.