Hi guys. I heard great things about Hofa tube bass traps. It looks cool and it is very easy to place it in your Room. This is what I found in the local store. Is it any good for bass trapping? photos.app.goo.gl/4Hiaqb4kxUJMMihz9
I don't know. Is it a tube-formed frictional absorber? Maybe it has absorption coefficient data available? If they're cheap, maybe you can test them.
Yeah its just rockwool but not in the "panel" dimension but in a roll. (not talking about HOFA - they are not cheap - talking about rockwool rolls). But hose rolls seems pretty soft! So I guess thats not ideal. So you dont need to drill holes to your walls and find the "final position". You just put them where you want and you can move it forever ... like in this picture. Thats very practical, but they are almost the same price as basic rockwoll "panel" so if its less effective I would rather buy another panels haha.
Doesn't a circle have more surface area than a square? Either way, the main disadvantage I see is that these rolls are leaving so much of the wall exposed. A lot of people ask whether they can leave rolls of fluffy in the plastic and place them around the room. The thing is, I think it's always better to turn them into panels and get more surface area happening with them.
Unless you can afford to test them or find someone who has, I'd say stick to panels which we know work.
Since I really don't know how the Hofas work, but if they are porous absorbers like the panels we usually talk about, keeping the rock wool in the package is not the most effective way to deploy the material. Also the area that the wavefront "sees" is important. A smaller area is less effective, and you'll need more of them to get the same effect as less panels.
Something I should add is that acoustic panels are 'incident-dependent'. As that pertains to these tube absorbers, they'd be best placed away from the walls. I'm thinking they could be useful in a wine bar or museum, integrated like a potted plant or gilded ashtray stump, gathering up ambient sound as those tend to coagulate ambient people.
It improved the frequency response and it definitely got the decay times a lot more uniform. Unfortunately I haven't documented very well how much I placed in every measurement but I can at least say for certain that all 9 are placed in the last graph.
Like I said I think they perform pretty well though in all honesty I have no first hand experience with Realtraps or Gik or any other serious competitor for that matter, so I can't really say anything how they would compare to those. Curious what Hexspa and Ethan think though
Thanks for posting about your Hofas. I didn't notice much in the way of details on the site (not that they were not there, I just didn't see). So I'm wondering, are they directional? Do they have a front and back? What are the placement recommendations, like how far from a wall etc.?
They don't have any "directionality". They work at the 1/4 wavelength (velocity absorption), at least I read long ago they state that the basstraps become more effective when placed from the wall. They had some more detailed information on the site but I can't find it back atm. Edit: Found this. hofa-akustik.de/en/modules/basstrap/details/ "Practical tipps: To achieve even more absorption of the low end, you can place the Basstrap with some distance to the room corner(...)"