[RCduck7]

Not to crush either your enthusiasm or project, but:
1) How big are your floor joists?  They look on the small side to me.  Also, check with your local codes.  I was under the impression that notching joists is a no-no.

2) I see at least 2 electrical junction boxes that will be buried under the floor.  Unless they can be accessed from underneath (doubt it), you are in violation of the electrical code.

You might want to check these out before you get too far in the construction.

[RCduck7]

Not to crush either your enthusiasm or project, but:
1) How big are your floor joists?  They look on the small side to me.  Also, check with your local codes.  I was under the impression that notching joists is a no-no.

2) I see at least 2 electrical junction boxes that will be buried under the floor.  Unless they can be accessed from underneath (doubt it), you are in violation of the electrical code.

You might want to check these out before you get too far in the construction.

The joists are 2.4" thick or measured 6cm in the European country where i live.
I am sure it beats having a metal frame for making a wall, it's more solid, i guess the picture doesn't show it nicely.

I'm not sure what the "electrical code" is in your country, i am from Belgium. But be assured the junction boxes are for the lights for the rooms that are beneath and not for electric current to components. I have to say, when the laminate floor is in they will not easely be accesable from in the attic but they will be from the false ceiling underneath. I do know a thing or 2 about the electrical code, when i bought this house i was suprised how things were done in the early days. I will have inspection control about the electricity within the next 12 months becausse i just bought this house. Regulations are pretty sharp over here. I do have to redo the electricity for some part. This listening room is only one of the things i will change in the house but since it is a forum for acoustics i do not mention it!!

[BobRex]

The joists are 2.4" thick or measured 6cm in the European country where i live.
I am sure it beats having a metal frame for making a wall, it's more solid, i guess the picture doesn't show it nicely.

I'm not sure what the "electrical code" is in your country, i am from Belgium. But be assured the junction boxes are for the lights for the rooms that are beneath and not for electric current to components. I have to say, when the laminate floor is in they will not easely be accesable from in the attic but they will be from the false ceiling underneath. I do know a thing or 2 about the electrical code, when i bought this house i was suprised how things were done in the early days. I will have inspection control about the electricity within the next 12 months becausse i just bought this house. Regulations are pretty sharp over here. I do have to redo the electricity for some part. This listening room is only one of the things i will change in the house but since it is a forum for acoustics i do not mention it!!

In the US it is against code to hide any junction boxes behind flooring or wall material.  None of your postings mentioned you are in Belgium, so I had no way of knowing.  Since you have access from below, you should be fine.  As far as the floor joists go, again, depending upon span, these appear to be too small.  Two by tens (at a minimum) are typical floor joists around here, although I've seen 2x8s used for very narrow spans.  Keep in mind, the notches reduce the size by a few cm, which is why that's frowned upon here.  Your joists appear to be square - I'm not sure how that affects the calculations, so again, maybe you are ok.

[RCduck7]

No, i didn't mention i was from Belgium, i only mentioned this when i was just registered as a member on this forum, after that i guess i didn't felt the need to mention it every time. The reason i am a "Belgian" member on this forum is to broaden my horizons and becausse i like a lot of speakers and US equipment that is not available in my country. For instance, i own Hyperionsound speakers and do have an Emotiva UMC-1 surround processor wich are normally almost not known of where i live.

The joists are not square and they are not covering the hole area. Where a supporting wall is an other beam start near it, so they are not very long. The paralell distance between beams is also a foot + half a foot wide, where in most cases they appear to be a distance of about 2 feet in between beams. I don't feel like the beams are not supporting floor/ space enough.

[RCduck7]

The soft insulation has been put in the walls and we starting finishing these with hard plates...

[RCduck7]

The walls are finished but the basic (old and not to fresh) floor is still present without any additional underfloor or laminate. Before finishing the floor i decided to let the subwoofer a go in the room to see how bad the room would resonate in it's unfinished state. As expected, when i go very loud on the low frequencies i heard the plaster plates on the walls vibrate, especially in the area where the sub is located and a bit lesser in the other outer corners. I realise i have decided to build the walls too soon, i should have put more of an effort to decouple the walls from the floor. Allthough, i don't think this would get rid of the problem completely. The best solution i could think of at this point is getting the existing floor out to the point where the floor meets the wall, after the walls where the storage space is the old floor is still present. With the floor out i'm planning to get a a layer of some sort of decoupling/insulation rubber on the beams before a new more massive and stiffer underfloor gets in. The new floor would also make no contact with the walls. Then i will try out the subwoofer in the room again. I hope this would help a lot. If anyone has some tips to make the walls less prone to resonate without breaking them down and building them again up from scratch, please let me know.

[RCduck7]

The old floor is out and rubber straps have been placed on the beams.



I now have a new stiffer floor with a layer of epoxy, these type of floors are often use for concrete, in caravans. They are more durable and form a good base for finishing the floor with laminate, etc..




A shot of one of the storage spaces behind the walls of the listening area...
(the storage space area will still have the old floor, couldn't see no reason for that being changed as i presume it won't have a negative impact on the sound in the listening area)

[RCduck7]

I have been placing speakers in different sides of the room now. I originally planned to use the speakers along the sloped ceiling but the sound was hard and a bit closed in.It turns out they did sound at their best when placed along the brick wall and with the seating position at the sloping ceiling. Gives me space for a big screen in that setup also. Only, with the brick wall i now have to create some fake wall or closet type of thing to get my wires out of sight.