UPDATE: all but spots along sidewalls (and a few other things) are done.
Status pictures taken on april 2, 2018
So - it's time to start sharing my construction of HT v2 !! I never got around to sharing V.1 – not least since no construction was done 🙂 I have been lurking on AVS since 2004, when HT v.1 went live; now its time to share my own project.
It was started in the winter of 2008-2009, but has suffered a 4 year pause due to a PhD project, after step 4 was finished. My oldest son (12 years old) and I picked up the project in the fall of 2014 🙂
means "the cinema" or "the movie theater" in Danish, and that's what the room and the project is called in my family.
This thread will serve as place keeper for plans and thoughts and serve as construction log, with pictures. I will share the process of the already completed steps (1-22), as well, including pictures.
The home theater is an attic that after phase 1-3 in the plan below now measures (LxWxH) 6.3 x 3.8 x 2.3 meters (20.7' x 12.5' x 7.5'). I am really missing 2-3 feet in width and 2 feet in length, but the room is as it is. It will be tight when coming and going, as I decided for two rows of four seats (Berkline 090) at the expense of walking area. There will only be two really good seats, but guests will still be impressed, I am sure 🙂
The style will be a clean theater look, with an AT screen on a false wall, GOM covered walls and ceiling - black ceiling, burgundy walls - and a black oak hardwood floor. The room has classic attic sloping walls - these will be black as well.
Since the constructions has been underway for some time now, most of the design decisions have already been made, but there will will be plenty of smaller decisions yet to make, where I hope to get comments and tips from the fabulous members of this forum 🙂
I have been inspired by many, many threads, but mostly from from Sandman/SmX (star ceiling, AT screen), CJO (Dark Knight Cinema), and Cathan (Flaming Oak Cinema). In addition, Bryan Pape has advised me (in 2008) on the acoustic treatment plan.
will describe the plans as well as show the latest pictures. I will post links from the plan to the respective posts that start a new phase.
will briefly describe the background of the project, i.e. HT v.1
will be reserved for final pictures
and forward will be construction log
Clear out HT v1. and make an interim setup in game room - under the name "Sal 2" (Cinema 2 in Danish) DONE! (link)
Isolate and soundproof "biografen" (Sal 1) DONE! (link)
Convert the rear 2 meters to office and sound barrier DONE! (link)
Fill ceiling cavities with 4" broad band bass absorption DONE! (link)
Make and install star ceiling acoustic panels (1” OC703 on top of the 4” in cavities. Black GOM) DONE! (LINK) Star ceiling design LINK
Make and install sloping side wall acoustic panels. Black GOM. Consider pre-planned wiring for four ATMOS / 3D ceiling speakers, to include at rear wall. DONE! (link)
Buy, spray paint black, and install four GIK versifusors on rear part of each sloping side wall. DONE! (link)
Make window cover boards, right half will be removable for additional fire escape. DONE! (link)
Make front wall vertical corner bass traps (Fluffy Knauf) - Will skip due to subwoofer placement!
Make front wall, ceiling-sloping side wall, and front wall-floor bass traps (12” x 12” fluffy Knauf) - Will delay until room is calibrated and the acoustics without treatment are well know!
Cover rest of front wall with 2" OC703, and cover all fiberglass with cheap black AT fabric. Will delay until room is calibrated and the acoustics without treatment are well know!
Make false wall skeleton and test screen position with white sheet (sloping walls determine how high screen can be mounted - the acoustic panels add to this problem) DONE! (link)
Finish false wall skeleton with consolidated mounting hole for AT screen DONE! (link)
Set up LCR speakers and subwoofer behind screen wall (3 possible positions for sub – which one to start out with? Cannot really test until acoustic treatment and chairs are in place…) DONE! (link)
Mount SMX 110" wide Cinema scope AT screen DONE! (link)
Make projector shelf and set up projector. DONE! (link)
Test riser height and depth with two (of 😎 Berkline 090 seats. Likely 35-50 cm high (14-20") and 170 cm deep. DONE!
Build riser – will serve as broad band bass trap as well and will have two Buttkickers LFE. Include Ethernet switch and 110 V + 220 V wiring, wiring for USB hub, twin mini jack pluck for headset w/mic, and wiring for Buttkickers. Include hidden rope light at riser edge. DONE!
Floor – All black oak floor or some black carpet in front of screen? DONE! Black oak floor added!
Acoustic treatment of rear wall: 5” OC703 up to 140 cm (55”) w/ Burgundy GOM, three black GIK versifusors above. Consider wiring for rear surround speakers DONE! No OC703 on rear wall, only versifusers.
Connect and hang rear surround speakers DONE!
Rear vertical corner bass traps (SSC with fluffy Knauf). Burgundy GOM DONE! Only trap in rear right corner, due to roof access door
Make special panel to cover hot water radiator (heating) to allow heating, yet discrete/hidden. Still missing!
Burgundy GOM treatment on rear half of vertical sidewalls. Empty frames, no OC703. Include pull wires for side surrounds and set up mounting brackets DONE!
Make black AT panels for screen wall – use black GOM or black velvet from SmX? (have – is not as AT as GOM…) Still missing! Will use black GOM
Make 12 mm OSB panel covered in black GOM with LED spotlights for each side wall where sloping wall meets vertical wall. Still missing!
Connect wiring for LED spotlights, including dimmers in 4 zones, two in each side, front and rear half of side wall. DONE!
connect amplifiers, surround processor, HTPC, blu-ray, etc. DONE! Major mistake 😄 Slowed further progress to almost zero
Setup sound – test with REW ? DONE! Need more testing
Experiment with front half of vertical side walls acoustic treatment. Test with stereo music, Dolby Pro-IIx 7.1 music, as well as 7.1 movies. DONE! Need more testing. Considering black velvet on side wall first 4' from screen, then a versifusor stack
all the rest 🙂
Equipment list (2019):
Denon X4400H receiver, with DTS:X, Atmos and Aurua 3D, has 9 internal amps, but I only use 4 to power rear heights and rear surrounds
Lyngdorf TDAi-2170 amp for LR, bass management for front main L+R and 4 Rythmik subwoofers. Room Perfect EQ used in place of MULTEQ XT32 in receiver.
Denon AVC -A10SE used to power center, front heights and surrounds (X4400H could power them all, but I think spreading the load will provide more control over the speakers)
HTPC w/ Media portal 1
Mediaserver (Norco 4224, with 24 HDD, WHS 2011, 4 DVB-C tuners, Mediaportal TV server, Plex server)
Apple TV4K (iTunes, Netflix, HBO, Viaplay, DR etc.)
Audiovector M3 Signature LCR speakers
MK Sound SS150 L/R side surround speakers
M&K SS150 THX L/R rear surround speakers
MK Sound IW-85 L/R rear heights
Audiovector Mi1 L/R front height speakers
Rythmik subwoofers: 2 x E15HP and 2 x FM8
JVC RS540 (DLA-X790R)
SmX 279 cm (110") wide cinemascope AT screen
IHC light control
- Lyngdorf MP-50 16 ch processor (10000 USD) - Timeframe: 2020
Basic layout plan
- yes, all layouts and construction plans will be in hand 🙂
Acoustic treatment plan:
4" of OC703 on rear half (over seating area), 4" standard Rockwool on front half. The 4" fill out the cavities between the joists.
In addition, 1" 703 in a 1" wooden frame wrapped in black GOM all over ceiling, by making six 94x160 cm panels. Although ceiling is 182 cm wide, rather than 160 cm, I left the last 22 cm to be covered by the sloping wall panels. One reason was the width of the roll of black GOM - its only 175 cm.
All 1" ceiling panels will have 3 mm rubber spacers between them and the joists, for a bit of decoupling.
I considered adding pond liner to the 1" panels in all areas except FRZ, to make room more live, but decided on wooden floor instead, for same purpose. The 1" panels will have a fiber optic star ceiling installed.
A 1" ceiling panel:
Sloping side walls:
The front half will have 96 mm deep panels with strips of 6" wide and 3" thick OC703 in a 21x96 mm wooden frame, spaced by 5-20 cm (no repetitive pattern). Design is inspired by Bryan Pape. I will make connected sections 94 cm wide and wrapped in black GOM to match ceiling panels.
The rear half will have 4 GIK versifusors on each side, side by side, and oriented vertically. Above and below the versifusors, I will make GOM wrapped panels to match the front half of the sloping wall.
Construction drawing for sloping sidewall acoustic panel:
Layout and construction drawing for sloping sidewall full treatment, including versifusors:
Since I know it's hard to visualize, here is a completed panel, seen from the back side:
Bryan Pape advised 2" OC703 on whole wall + super chunks corner bass traps from floor to sloping ceiling + 6" x 6" on floor/wall corner. Window to be covered in double ½" OSB w/ green glue. I will make the right half of window cover removable, as an extra emergency exit.
I have decided not
to make SCC, but will instead make 30 cm x 80 cm (12x31.5") vertical soffit type corner bass traps using fluffy Knauf + 30 cm x 30 cm (12x12") likewise traps for sloped wall/front wall, front wall/ceiling, and floor/front wall corners. Rest of wall still 2" OC703. All wrapped in black AT fabric (something cheaper than GOM).
This picture shows the difference between a 17x17x24" super chunk triangle corner trap and a 12x12" square one:
reconsidering due to planned test of Lyngdorf TDAi-2170 with two front corner loaded sealed subs. The Room Perfect eq supposingly negates the need for corner bass traps. I can always add them on top of the subs if desired/unhappy. In addition, I will NOT TREAT ENTIRE FRONT WALL initially, but try without treatment, then add for testing purposes.
5” OC703 up to 140 cm (55”) w/ Burgundy GOM, three black GIK versifusors above. Black GOM wrapped OC703 5" panels for the triangles on the sides of the versifusors, as well as above them (from 200 cm to 230 cm).
I am considering
making the OC703 panels with open sides rather than using a 5" wide board, to allow bass to travel horizontally across the panels. Any thoughts on this?
I am also considering
using pond liner in the OC703 panels, since their main purpose is bass absorption. The pond liner should per Pape's advice, be mounted floating against the OC703 and will increase bass absorption. Anyone, beside Bryan Pape, that has tried this?
The door will be a challenge - the OC703 panel cannot be too heavy. It will have a versifusor at the top, that will just be mounted with adhesive velcro. Unsure if OC703 panel can be velcro mounted. The door has heavy hinges, but probably not designed for more than the heavy door itself.
reconsidering due to planned test of Lyngdorf TDAi-2170 with two front corner loaded sealed subs. The Room Perfect eq supposingly negates the need for rear wall bass absorption.
Rear vertical corners:
17x17x24" Super chunk corner traps using fluffy Knaub.
The left rear corner trap needs to be removable, since there is an access door to the roof. I am considering hinges that will make it swing 135 deg.
reconsidering due to planned test of Lyngdorf TDAi-2170 with two front corner loaded sealed subs. The Room Perfect eq supposingly negates the need for corner bass traps.
The rear half
will probably not have any broadband treatment.
Maybe a few versifusors on the left side between the two rows - the seats will be right up against the left side wall.
The right side will not have room for more than 1" of treatment due to walking passage, but 1" will not be broadband enough, so likely it will just be burgundy GOM on empty 21 mm frames - maybe strips of 21x45 mm wood under GOM for cruder scatter/deflection.
There is a water heated radiator inside the right side wall. I plan on covering it with a panel made of strips of 21x43 and 21x21mm painted black, with burgundy GOM spray-glued on, and cut off between the wooden strips, to allow the hot air to come out.
The front half
will be an experiment; I will test different setups when everything else is done:
A) 4’ high 6” OC703 + 1.5’ bare wall, or
B) 4’ 6” OC703 + ½ Versifusor (1’ high), or
C) mix of 4’ high 6” OC703 and 4’ high versifusor (two stacked) (ABABAB), or
D) only versifusors, or
E) bare wall (baseline - not a final option)
I might make the treatment removable with velcro. Then, if something sounds better for music, and something sounds better for movies, I could switch. Possibly, two channel music might be better with diffusion or a mix of diffusion and absorption - we will see (hear 🙂 )...