Reading this thread make me happy that I am not in this rabbit hole.
Every time I turned up the volume to make the house shake (Gryphon D333 plus FR30 will do that easily), the boss would shut down the system (not just turned down the volume).
I do not think the bass units from FR30 were ever breaking in yet.
Yes. The subwoofer rabbit hole is a fun rabbit hole. Just add footers, lol.
Stack Audio newsletter, there’s a couple of reviews of the SW footers, a pretty detailed one on Youtube by Hans Beekhuyzen. Shouldn’t be hard to find. He really liked them.
Also another one by ‘The Freight’ on Youtube, which I haven’t watched yet.
I received my two sets of Stack Audio SW feet today for my Rel Carbon Specials. I’ve got them installed and ready for testing later tonight.
Anyone know if there’s a time frame for the feet to settle to reach their optimum performance?
Shake the feet a few seconds. That helps. About three days maybe for total settling in.
How do you have them installed? Did you connect them directly to the bottom of the subs without the original base of the subs, and therefore lowering the subs? Or did you place the feet beneath the original base, therefore raising the subs? You should hear differences immediately, as changing the height of the sub is not something that takes time to burn in.
I followed Stack Audio’s advice, as per the installation instructions and attached the SW footers directly to the sub after removing the Rel’s runners, so the SW feet are screwed in.
I forgot to do the ‘shake’ process but as the subs were on their side for the SW install, putting the SW feet onto the bolt thread necessitated turning the footer around in a circular motion so accomplishing this step.
Interestingly, I reread the installation instructions and there is no mention about shaking the SW feet.
I briefly turned everything on just to ensure the system was working ok.
Proper testing later tonight.
I had a listening session last night, with only the theatre side being used.
I have not heard from Josh yet regarding time for the SW feet to settle down to give optimum performance.
I found the bass had lost some of it’s depth, still strong but just not as ‘room shaking’ as before.
One advantage I noticed was that my surround sound seemed improved, more of an Atmos bubble, perhaps due to cleaner bass integrating with the rest of the sound?
I did not change any of my sub settings. If I decide to keep the feet I may need to increase some of the bass settings to compensate for the slighter lower level of bass output.
One peculiarity with my system, I had my subs sitting on an Audiophile Base platform. Josh recommended removing these, which is what I did.
I might try re-installing these to see what it does?
The shaking of the feet has been something reported by users as beneficial, didn’t come from Stack.
Thanks.
I’m planning to re-read this thread specifically for the Stack Audio feet as they’ve been out a while now and I can’t remember the earlier comments.
IME give it a day or two before coming to a final conclusion. I know some report no settling time with Auva products, while some do. I tend to fall into the latter camp, through I only have the 100s and EQs, no subs footers here.
AUVA 100 with its bigger volume took a longer time to settle (a few hours if my memory servers me right). But I did not shake any first. 
I have since moved FR30 1000 times so that counts at least 20 shakes.
Stack EQs for components made sound impact like within a few minutes, and I did not shake any either.
I listened to some music last night and ended up setting the high level input to one single notch.
In doing some I lost the setting I had for the LFE channel as I mixed up the high level and LFE controls in setting the high level.
Music sounded great, with better mid range and treble extension with the subs in play.
I still feel I’ve a long way to go with testing these SW feet out.
I’ve heard nothing from Josh in a few days now, Shows the company is growing and he’s being spread more ‘thinly’ now with more customers and an expanding product line.
A better night last night.
I decided to re-instate my audiophile Bases under each of the subs.
Watched a bit of streaming to let things acclimatize, as I had moved my LFE controls the previous night, I’ll need to revisit these to correct them, so no critical listening done with the theatre.
Then listened to some music which was now much better.
The MAGIC returned.
A sense of ease, inner detail improved, able to hear how the song was put together with the production details, no hardness in the top end, mid range, vocals very clean and clear.
A big improvement on the previous night.
I remember reading in this thread earlier that the REL engineers had set the Rel runner feet at a certain height to optimize performance.
The Stack Audio SW feet are shorter than the Rel runners.
I don’t know whether the Audiophile Base platforms are essential to add the extra height or a few wooden blocks or other material would accomplish the same thing?
I’m now happy with the performance of the SW feet and plan on keeping them.
I always think that getting the stereo to sound good is a harder job than the theatre so it’s just a matter of rediscovering my LFE settings to get that right as well.
I’ll be interested, once I’ve those set, to see if the deeper bass returns that I know the Rel runners gave me.
So, to clarify, you now have the runners off of the RELs, the Stack footers screwed into the REL directly, and the whole thing on an audiophile stand? And, the height of the audiophile stand plus the footers now equals or exceeds the original height of the runners?
Yip, pretty much spot on. The Audiophile Base unit is a wooden platform, designed to absorb energy and dissipate it as heat. It’s probably 3/4 to an inch tall.
I’m sure any other platform would accomplish the same effect but I’m guessing.
Basically for me the SW feet aren’t tall enough to allow the Carbon Specials to perform at their optimum.
I’ve emailed Josh regarding this but haven’t heard from him yet.
As I’d lost my LFE settings I added another 3 ‘clicks’ on my LFE control on my subs tonight, taking them from 12 clicks to 15 now and that seems to have reinstated the bass levels I was experiencing with the original runners.
I’m now completely happy with the SW feet and consider them a good upgrade over the standard Rel runners.
Without the Base platform I did not think the SW feet worked well with my subs.
I’ve always run the subs with the base platforms so perhaps they already enhanced the subs performance? I’ll never know the answer to this question as I’m keeping the SW feet and they are better than the Base’s with the Rel runner feet.
I heard from Josh today.
I mentioned this thread and he read through it.
He’s going to take my comments about the SW feet height being too short for the Carbon Specials and feed them back to the development team. He expects them to make a bolt for the feet that will make the SW feet equal to the height of the Rel runners.
He may send me a couple of sets to test?
That will allow a true comparison of using the Stack SW footers versus the standard runners without a variance in height. REL of course recommends against any such decoupling footers because they want the sub locked to the floor, saying that use of such will decrease low bass and relatively increase higher bass. I will be interested in your assessment of SQ between those 2 methods, which will probably require resetting the crossover frequency.
Forgot to add a couple of comments.
One of the scenes I use for testing bass in movies is the car chase in Ready Player One. The main guy has a friend called ‘H’ and I’ve always had difficultly in following his dialogue. With the SW feet in place and on the Audiophile Base platforms, following his dialogue was improved, not perfect but a good bit better.
I upped my high level input by one click last night, with no detrimental effects, music was still super easy to follow without the bass being overblown.
Obviously more testing to be done as I may be able to increase the high level setting further.