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zanon wrote:

My room is big … So how to measure it's size? Just write in floorplan of the entire house.

I do not think that we need to measure room size but we need to understand the acoustic consequences of the room size and to measure the acoustic response of the room.

el`Ol wrote:

At least for corner horns I think I can say that lightweight drivers are the better solution. HBM's corner horns with, I think, 18" drivers sound as if an avalanche was rolling over you, something I didn't experience with corner horns containing four 8" drivers I heard at the home of a Manger addict. An other difference was that these horns were completely built of thick soft-fiber boards, nothing hard at all, but I think the drivers played the mayor role. But what I learned from HBM is that corner horns are less dependent on "real" corners as one usually thinks. In the visiting a reader column of a German hifi magazine I even saw a system where he avoided an existing corner to get better results. What bout this?

Oliver, yes, the idea to use midbass channels in the position that you specify is an interesting idea. Unfortunately I have no corners in there in the real room.  I do not think about alternative midbass channels now (with exception of temporary channels) and I hope I will go during summer for my midbass horn in attic.

jessie.dazzle wrote:

What am I saying? You might consider building a pair of "end of life" lower-bass channels now, while waiting to get on with construction of the mid-bass horns. This would be a good investment of your time and money, as you will need them in any case, and it would allow you to really use your system again.

Jessie, I know about my need in future to make lower-bass channels but I would like first to know how low my midbass horn will go in the room acoustically. Lower-bass channels that worst at sub 30 and sub 60Hz are different and I would like to know what I am dealing with. Generally the idea is to get proper sound with midbass channel and only THEN to add the lower bass by the need. The octaves under bottom are very short, room modes are wide and any improper calibration or use lower bass will mask out problems with midbass. The lower bass is in a way a “simple channel”, so it would not be a problem to employ it when I need it…

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