Help me understand how to optimize bass on the Zu Definition Mk IV

Phil, you don't know the half of it LOL.

I'm trying GSM's suggestion of subs at 45Hz and 9/10 Level.

My default setting is 38Hz and 6.5/10.

Marc, while I was waiting for Phil to come back with info about the bass gain (keeping me in suspense haha!), I was reading some of the threads here and elsewhere about the Definitions. I noticed that you previous had Symposium roller blocks under yours, but now you are onto the Revopods. I happen to have a couple sets of roller blocks lying around that I used to have under my preamp and DAC.... how did you find them under the Zu's? I always figured spikes / cones would be better for speakers and roller blocks better with components that would be affected by micro-vibrations. What made you move on to the Revopods? (Though I might regret asking, since they are $$$!) David

Temicxoch, all this stuff is buyer beware, and critically, room dependent. My old space was a converted industrial loft with a bombproof solid concrete floor overlaid w timber, which meant that the option of Rollerblocks replacing spikes under the Zus was possible, and indeed these did have the edge on stock spikes.

Here, my floor is much more flexy, being an 1861 actual roof space. Even though I didn't realise it to start, the Rollerblocks were deleterious on this floor. I noticed existence of Revopods as I went to trial IsoAcoustics Gaias footers, tried both out, and the Revopods totally ruled. I can't say w any great confidence why this is the case, but for me the Revopods have really pushed my Definitions performance to the next level, incl the ability to get deeper, tighter and more extended subs output, which I know is your ongoing issue.

I'm not going to claim they are your solution, it's room setup and subs settings that needs to be yr current focus, but these footers could then be the icing on the cake.

For the record, the Revopods sit on Panzerholz slabs, themselves on Symposium Acoustics Svelte Shelves.

Thanks for the info! I do realize footers are less important than getting these speakers properly set up at this point. I was just curious to hear about your experience using roller blocks, since I have a couple sets kicking around. I never thought to try them under the speakers. It's a never ending quest, isn't it? :)

Give it a go, I certainly had success to start w RBs. Just take care on physically placing them under the Zus, they're obv not fixed.

Part of the joy of this hobby (or is that pain? LOL) is both incremental impvts, and occasional big leaps. 

For me, the Def4s have so positively responded to the system wide changes I've made, they've justified me not taking the easy option and simply upgraded to pricier, more complex spkrs.