Author Topic: Camps Bay Home Cinema - 2017  (Read 1415 times)

Offline Morgan Irwin

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Re: Camps Bay Home Cinema - 2017
« Reply #15 on: November 12, 2017, 12:59:32 PM »
The drywall installation process commences by building the sub structure with timber batons. We use timber to eliminate the possibility of resonance within the cinema.
For this reason, we use timber in the construction process wherever possible.



You will see that the speaker cabinets are mounted directly to the concrete internal walls of the room, this was to ensure that we maintain as much of the space of the room as possible. It is quite a challenge working in such a small room, but we are doing our best to economise on the space available to us.
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Offline CAD

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Re: Camps Bay Home Cinema - 2017
« Reply #16 on: November 12, 2017, 01:37:02 PM »
Following and very keen to see the final outcome  :2thumbs:
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Offline Morgan Irwin

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Re: Camps Bay Home Cinema - 2017
« Reply #17 on: November 12, 2017, 01:59:22 PM »
Thank you for your interest, glad to have you along for the journey to see the progress of this home cinema. 😄

Following and very keen to see the final outcome  :2thumbs:
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Offline Morgan Irwin

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Re: Camps Bay Home Cinema - 2017
« Reply #18 on: November 12, 2017, 02:49:17 PM »
Due to the special considerations of the bass response within the cinema, the Wisdom subwoofers have to be installed into the front and rear baffle walls in the a suitable orientation. This is to ensure that the bass frequencies produced by them are presented into the room at the correct planes to create an even bass response across the entire room.



Here you can see us all listening to Christiaan Beukes (hunched down next to the subwoofer) listening to what he has to say about the speaker location and the way we will mount it to the baffle wall.
For reference from left to right we have; Wesley Hesqua, Kyle Brown, John Hesqua, Christiaan Beukes, Morgan Irwin (me).

It was just about lunch time at this point in time in the day which is why I am munching away on that delicious apple :)
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Offline Morgan Irwin

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Re: Camps Bay Home Cinema - 2017
« Reply #19 on: November 12, 2017, 05:57:49 PM »
Before final installation, the front baffle wall is moved into place and test fitted to ensure that it has enough suitable mounting locations for the Wisdom Audio Left, Center, Right (LCR) speakers and the S90i Subwoofer.
It is constructed as a prefabricated frame, screwed together and strengthened enough to ensure that there is no resonance on the front wall when there are some serious sound effects taking place.



The lack of concrete slab on the left of the room was also a determining factor to ensure that the structure for the front baffle wall was as rigid and sturdy as possible. Without the extra place to ensure that the framing was anchored to the wall we had to make sure that the rest of it was as strong as possible.
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Offline Morgan Irwin

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Re: Camps Bay Home Cinema - 2017
« Reply #20 on: November 12, 2017, 07:31:17 PM »
Once the framing for the front baffle wall has been installed and secured we carry out the final placement of the front speaker cabinets.
As you can see we use our highly scientific measurement method ;) The centre of the front speakers are located at the listening height of the front row of cinema seats.



While the exact location of the centre of the speakers in relation to the listening position is not completely critical, we have done our best to ensure that it is as close to centre as possible.
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Offline Morgan Irwin

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Re: Camps Bay Home Cinema - 2017
« Reply #21 on: November 12, 2017, 10:10:16 PM »
This is what the speaker cabinet installation looks like within the drywall, this is prior to the installation of the fabritrak and acoustic fabric installation.
The speaker cabinets will be covered later in the cinema build process which is why they were constructed out of shutter ply.

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Offline Morgan Irwin

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Re: Camps Bay Home Cinema - 2017
« Reply #22 on: November 13, 2017, 08:58:45 AM »
Looks like I missed this post from my summary document, but here goes:
The first time that this home cinema starts to look like somewhere that movies and music can be listened to... The speaker cabinets for the front and surround speakers are installed. They are installed directly onto the structural walls of this cinema. The acoustic drywall construction is still to be installed to surround them.



Next stage in the process is to install the front subwoofer and start the drywalling.
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Offline Timber_MG

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Re: Camps Bay Home Cinema - 2017
« Reply #23 on: November 13, 2017, 10:03:36 AM »
Nice build. What LF treatment is being used and which modes are you addressing? Care to post some measurements?

Offline itscraig

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Re: Camps Bay Home Cinema - 2017
« Reply #24 on: November 13, 2017, 06:41:39 PM »
looking awesome, can you tell me if the walls are going to be at an angle?

Offline Morgan Irwin

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Re: Camps Bay Home Cinema - 2017
« Reply #25 on: November 14, 2017, 07:55:18 PM »
looking awesome, can you tell me if the walls are going to be at an angle?

The walls are going to be kept straight, with fabric walling installed onto them. Originally they were going to be stepped walls narrowing to the front of the room, but you will see in some of the upcoming photos that the design changed slightly during the build process. Keep an eye out to see how things changed.
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Offline Morgan Irwin

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Re: Camps Bay Home Cinema - 2017
« Reply #26 on: November 14, 2017, 08:00:40 PM »
Nice build. What LF treatment is being used and which modes are you addressing? Care to post some measurements?

Interestingly due to the construction of the room and its space, the room required very little low frequency treatment. There was a combination of high density and medium density mineral fibre installed into the drywalling construction and into the front and rear baffle walls. That is the extent of the LF treatment.
Due to the unique dimensions of the room we were presented with challenges of having dead spots and nulls if we were not able to introduce an even placement of subwoofers with enough energy of the room. The specification of the power amplifiers actually changed during the ordering process to allow a more powerful two channel amplifier to be installed instead of two single channel amplifiers. I would also like to point out that the front subwoofer was installed in a traditional orientation ("normal") with the bass port at the bottom of the cabinet. While the rear subwoofer was installed with the subwoofer "upside down" with the bass port at the top of the cabinet. This was found to be the only way to achieve an even bass response throughout the room while we were measuring the room on the computer generated plots.

In the next few photos I will be posting a photo with some information about the response of the room once we had measured it, you will be able to see the low frequency response of the room in this photo.
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Offline Morgan Irwin

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Re: Camps Bay Home Cinema - 2017
« Reply #27 on: November 14, 2017, 08:03:26 PM »
Mineral fiber insulation is installed into the baffle wall at the front of the room and the rear of the room for low frequency treatment, as well as to reduce structural resonance from the front speakers. For convenience sake, a section is left open to ensure that there is still a light reflective surface for our flood lights during the construction period.



The skeleton of the rooms bulkheads start to take shape too.
"Nothing great was ever achieved without enthusiasm"
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Offline Morgan Irwin

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Re: Camps Bay Home Cinema - 2017
« Reply #28 on: November 14, 2017, 08:08:31 PM »
In this room a drainage duct for the house pluming ran the length of the room. To ensure that there was no acoustic resonance from this hollow duct with timber lid, we have filled it with silica grade sand.



It was incredibly surprising to see how much of an impact the shallow duct had on reverb in the room. The 16mm shutterply lid of the duct would simply resonate the sound of any low frequencies back into the room.

It was a difficult process filling the cavity with sand, 53 bags of 40kg of sand were emptied into the hole in the ground. This took me personally 3 trips back and forth to Kuilsriver to collect the sand for this. An inconvenient surprise to us on the project but something that we got on and dealt with so that the project could continue.
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Offline Morgan Irwin

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Re: Camps Bay Home Cinema - 2017
« Reply #29 on: November 14, 2017, 08:31:00 PM »
Before the installation of the final drywall into the front baffle wall we are back on site with the HAA test kit to measure the response of the room according to the original computer generated frequency response.



We have found after measuring the response of the room that we have more energy than anticipated which is useful as this can be addressed in the room calibration software as opposed to trying to introduce more energy through room correction which would result in an inaccurate representation of the soundtrack of any movie or music.



It is not completely clear in the photos, but the room has a smooth response up to 100hz which is where the plotted rolloff of the subwoofer begins.



If you can see by the photo taken onsite of the HAA interface, the actual room response matches the computer predicted response very closely.
"Nothing great was ever achieved without enthusiasm"
~ Ralph Waldo Emerson

http://www.MirrorEdgeNetworks.com