Quote:
Originally Posted by
knightonabicycle
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Hello,
I am planning a new room and want to flush mount the first time. I still planned a few rooms with the LEDE principle and they worked quite fine. But this is new.
The room has 2.85m x 6.63m x 5.61m and is totally empty right now. I am at a starting pont of my measurments /plans and want to build up the acoustics suitable for the flush mount and now i have to decide where to put the speakers. So I had a few measurments and as expected a good listening position is in the first third of the room. The speakers ageled 30 degrees to the sweet spot don´t allow many positions. the only question for me is a good heigth form the floor. do you have a good idea how to calculate well? Are there any good tutorials for proferssional flush mounting in the web? i hope you can understand my bad english
the speakers should be the Neumann KH420 btw
Thank you very much!
Actual point where the "equilateral triangle" meets should be around 30cm behind the actual sweet spot as there is a distance between your ears and it's usually recommended to sit forward a little.
Don't angle your speakers in the vertical axis unless absolutely necessary. If so, keep the angle at 5° max.
Make sure you can remove the amplifiers from the KH420 using a remote amp / extension kit. Otherwise they will overheat and their reliability will be problematic very fast. They also have a ton of settings that you would not be able to reach once the speakers are permanently set in the wall. That's no good.
Unless K&H can provide you with a remote amp kit, it looks like they are not suited for in-wall mouting at all.
Make sure your wall construction is based around a very rigid and solid structure whose modal response is known and controlled (
https://en.wikipedia.org/wiki/Modal_analysis ) and is also highly damped, broadband. You can achieve that by using materials with a high damping factor layered within the mass and structural layers. These walls are always heavy.
Calculate the acoustic behavior of the cavity (ex: what kind of resonator it is) make sure it has a very low resonance frequency and very wide Q. Filling it with rockwool of the right density will help achieve that for ex.
Make sure your speakers are fully decoupled from the wall structure at a low natural frequency (<8Hz, aiming for 5Hz is better) also making 100% sure there are no possible nasty mechanical interactions with the front wall structure or cavity at said natural frequency. This also concerns the floating floor natural frequency (if there is one). Also make sure the wall cavity remains air tight.
Most importantly: do not mount in-wall unless you know you can control the rest of the room properly. If the rest isn't really tight, you're in for a lot of LF issues.
Proper in-wall mounting isn't a trivial thing to design and implement at all.