JBL THX home cinema room (with cats)

A room with a lot of JBL!!!

Description

JBL control 12SR fitted with JBL 2206 bass drivers for more handling power and slightly better over the JBL G-125. JBL 2371 HF horns. What you see is a five screen or 70mm Todd-AO SDDS 8. It uses two Dolby SDU4 decoders wired to the main AVR LCR and when the decoders are activated a nice spread of sound from dialogue panning smoothly moves across or may appear on one of the five channels. Sound effects smoothly move over the fronts and music sounds far wider. This not to be confused with front-wide.

x117 JBL speakers and 20kw THX sound system.

_MG_6541.JPG

(Star Trek II R2 DVD)

_MG_7037.JPG

120" acoustically transparent fixed screen with Viewsonic 727 4k DLP pixel shift projector (Top Gun R1 DVD)

_MG_6699.JPG

There is still plenty of room for more JBL
JBL 8330 mkII that came from Twickenham film studios dubbing theatre in good condition. Sidewall arrays, rear wall and centre middle back.
JBL control 5 on the ceiling x6 Height 1 Height 2 Height 3
Room is treated throughout and still some more tiles to be fitted.
Irwin rocker seats x6
Video projection port window at back of the room to isolate projector fan noise even when its on silent I can't really hear it just the movie soundtrack.

Note: behind laying against the wall a simple bit of cardboard with acoustical tiles glued to it so I can place above the AVR to keep some of the sound from going into the corner works fairly well.
_MG_6763.JPG

Main systems AVR and cinema processors
Denon AVC-X8500H Dolby Atmos, auro3D, dtsX
Dolby Stereo CP200 with NR, A and SR cards one of the best cinema processors made and still in use at selected 70mm cinemas today. I have the Dolby CP200 Accessory Unit as well and Dolby MPU1 with Dolby SRA5 Spectral Recording x8
Dolby CP500 and Sony SDDS DFP-D3000 the best SDDS processor as it has two AUX inputs and few other features as well.
Dolby CP45 decoders used for pre-amp and extra matrix channels
Dolby SDU4 for the five screen decoding
Dolby CP65
Dolby CP55
Dolby SA10 EX
Dolby EX DU4
Dolby PS1B x3
dts CAD-5

All players are placed on the other rack DVD HD-DVD bluray and UHD 4k

Behringer DCX2496 x3 for the five screen channels and subs

_MG_6814.JPG

The Dolby Stereo CP200 the finest 70mm cinema processor made. Selected cinemas still use these today as regular 70mm is still a huge interest to fans. Dolby PS1B power supply needed new DC capacitors fitted and some smaller capacitors from recommendations by Dolby labs to make the processor great again. The CP200 was released around March 1980 so its nearly 40 years old.

_MG_7155.JPG

Two other rack towers house the 20kw of amplifiers. Other rack is going to be for the Laserdisc players or maybe the other player as I can hear the spindle motors when the room is quiet at 30dbA or less.

_MG_6549.JPG

Lucasfilm Ltd THX Sound System, crossover/monitor 3417 with all the THX cinema crossover cards intact

_MG_7208.JPG


_MG_7145.JPG

BELOW SURROUND or Underneath Surround underneath the Irwin rocker seats is a matrix decoding of one or many of the sidewall surrounds. Basically it takes the sound of some panned off screen or onscreen sounds that often where you see a visual object moving at a downward angle offscreen often sounding on the sidewall surround arrays visually doesn't match the angle. Now that I had been using this for some years now and the idea first came to mind around 1998. There's up to x12 JBL control 1, for the Below Surround to be fitted in.

Bass seat shakers x6

_MG_6592.JPG

My cat Magic laying on the floor in front of my Dolby Stereo CP200 ready for soon install but had to have some few soldering modification/minor repairs done before installing.

_MG_7158.JPG

My first cat Sooty prowling around the home.

_MG_7209.JPG

Behringer ECM8000 for checking speakers frequency response ether up close to the speakers or multiplexing the microphones around the room with a multi channel audio mixer with lots of inputs Berhinger RX1202 or sometimes often use a smaller Behringer XENYX1202.

Comments

Moved second JBL 4782 TCB sub from behind the screen and placed second one at the back of the room. Took some hours to do, about 11hours as it wasn't easy to remove the projection screen had to be carefully taken down and the OLED screen carefully moved to one side and the OLED isn't lightweight... very heavy! The JBL 4782 also very, very heavy! A few cinema seats had to be undone to get the 4782 behind the back row seating and moved a little bit over to middle which is not seen in this picture.

82264153_10157748176105149_481229765299142656_o.jpg
 
Two more extra JBL 8330 mkII THX approved surround speakers. Placement for them as of yet not decided where to place them.

82241236_10157740781135149_7137918325178236928_o.jpg
 
Maybe you could resize graph with scale limits 30-100 db, 1/12th resolution? As posted its a bit difficult to see any detail, though you obviously have good extension!.
 
Ran the CD dts demo disc, LFE.1 only while activating REW record. The sweep on the test disc starts at 20Hz to 160Hz I ended the sweep before 160Hz as the crossover is set at 100Hz

dts CD LFE.1 sweep .jpg
 
Ran the CD dts demo disc again with all channels only using one the SW JBL 4645/4645C with the Denon AVC-X8500H set to LFE + Main to combine all the channels low end. Kitchen cupboards lighting was rattling!

dts CD LFE.1 all channels 10Hz to 20khz.jpg
 
Applied those settings yet the mic level on the computer or maybe the pre-amp microphone level is set wrong? As the graph shows rather high.

JBL sub.jpg
 
Yes, that is very good smoothing and extension from multiple subs
I repeated it several more times since last you, posted.
I'm just about used the PEQ on the DCX2496 on one of the output channels and still have 9 PEQ on the NX3000D that not in use at present.

Too bad I sold the miniDSP 24 HD as it was not handshaking well with AVR and REW though the HDMI to AVR. No matter I think extension looks satisfactory enough for now.

JBLsubs.jpg
 
EX cheaper than fish n' chips.
x2 more SA10 EX matrix decoders to be used with x6 Overhead surrounds soon... The third SA10 has been racked up in the amplifier rack for months. All are in working order. Gonna need some more 304 quad amplifiers.

EX1.jpg


EX2.jpg


EX3.jpg
 
Moved the Dolby CP500 over into the other rack to make a little space in the rack to fit the Behringer MDX4600 back in and make get two more MDX4600 as they have a good smooth audio limiter function and the gain level can boast the -10dbu signal up +4dbu.
THX rack1.jpg


THX rack2.jpg


THX rack3.jpg
 
Starting on an all New Atmos Overhead expansion to expand it from x6 to x12. New pair of Quad amplifiers Behringer EPQ304, be installed in few days.

Making some rack space in the amplifier rack involves shuffling equipment around for the x3 Dolby SA10. They sell cheap today and not a half bad matrix decoder. I was thinking of using the existing cluster Onkyo AVR's but the weight and height of the AVR makes it near impossible to fit into the rack. So I came up with an alternative. Dolby SA10 is only many millimeters less height and with Quad amplifiers being only 1U frame makes it easier to use them.

1.jpg


2.jpg


3.jpg


4.jpg


Just one more SA10 to install. I have one DB25 I can use to connect up one SA10 while I wait for the other DB25 to arrive in few days with amplifiers. The system will be balanced out.
 
First testing of Height 1 though a Dolby SA10. I call it Dolby Atmos PlusIIIx with DOG "Dolby Overhead God" :greengrin:

1.jpg


Extra quad amplifiers Behringer EPQ304.

2.jpg


7.jpg


3.jpg


4.jpg


JBL control 5 Plus being used for the Height 1 middle channel same will be for Height 2 middle overhead and one JBL control 5 for Height 3 rear back middle. Total x9 Atoms overhead surrounds.

6.jpg


Only two more to fit to the ceiling and the extra channels I have to find the pin outputs on the DB25 connector will be maybe placed at floor level for ambiance effect or a THX eXperimental.
 
Last edited:
Sound pans are a lot better with the extra channel in-between Height 1 and soon Height 2 and 3. The Dolby SA10 does it nicely. Can't wait to get the extra channel wired up for floor level to experiment to see where the signal steers to over each Height 1, 2 and 3, or x12 channels.

DOG Dolby Overhead GOD AtmosPlusIIIx.jpg
 
Height 1 with DOG 1 and Height 2 with DOG 2 are fitted up now and sounding!

DOG "Dolby Overhead God"

I'll do Height 3 with DOG 3 later in the day.

I'll figure out which pin outputs are for the matrix rear surround and what am I gonna call it?
The acoustical tiles will have to be resized and fitted back up.

DOG 1.jpg


DOG 2.jpg


DOG 3.jpg
 
All three DOG channels are fitted up and sounding now!

DOG Dolby Overhead God its the All New World first newest channel. :redgrin:
Extra channel Height 1 Height 2 and Height 3 have been tested in the kitchen so I know the outputs are now sounding to the amplifiers all next is to wire up the JBL control 1 for floor levels and calibrate and test and test until its good.

d1.jpg


d2.jpg
 

Item information

Added by
JBLhomeCinema
Views
12,963
Watchers
11
Comments
68
Last update

More in Finished Home Theaters / AV Systems

Top Bottom