Benje Posted February 25 Share Posted February 25 My new build is well underway, with the first floor theatre room with wall frames, floor, roof in place. Electrical first fix is in with speaker/data cabling next week and gyprock in March. It was going to be a 'Folly' but since the stairs have gone in, the name for the theatre in the sky is obvious - HEAVEN. You can guess the name of the staircase - LZ). The room is 8510 mm by 4980 mm to the outside of external isolation. That comprises foil span (40 mm), stud wall (90 mm) and double gyprock/sound check (26 mm). Any acoustic treatment eg AccouFelt will be additional. The acoustic screen/speaker wall is 500 mm deep, less the 26 mm of gyprock. So, the internal walls (before accoufelt, from front wall to rear wall) will be 8198 mm by 4668 mm by 2700 mm. There is a 474mm theatre wall, with the screen hanging from the front (150" 2.4:1 acoustically transparent). There is a riser (3000 mm x 1600 mm x 240 mm, with an extra 40 mm on the sides and rear for LED lighting strip). 4 recliner lounge seats are in front, and 4 fixed seats on the riser. There is standing room behind the riser. From the acoustic screen to the start of the riser is 4800 mm (rear of front recliners). The riser is 1600 mm The standing area is 1324 mm. Main speakers proposed are a Krix MX-40 (subject to approval by Krix) with Hyperhonix 45's used for other positions. A VAF double Gravitas sub will be used at the rear to complement the passive KRIX subs at the front. The proposed wiring for the speakers will be 9.4.4, with front wides used to make the 9 and atmos speakers about 2.5 metres in front of the main seat position and 2.5 metres behind making up the 4. There is a 460 mm dropped ceiling on three sides due to internal ceiling beams - about 550 mm deep. We may add a false dropped ceiling on the right side wall to match the front, rear and left side wall. We will see. There is an AV rack in the adjacent room that abuts the right rear of the theatre where most equipment will be housed. The door is on right wall in front of the main 4 reclining lounge seats, and just behind where front wides would go. A Sony Laser projector will be used to display the 150" 2.4:1 screen image. The processor is likely to be an Anthem AVM70, although I do get some advice suggesting more expensive options . I'll need a lot of channels of amplification as the Krix MX-40 needs bi-amping (so front three needs 6 channels) plus a strong 2-channel amp to drive the passive front subs and then perhaps 10 channels for the surrounds if I include front wides and front+rear Atmos. The one question I am asking of stereonet theatre users today is what to do with the cabling from the right rear of the theatre to the front wall sound stage? My preference is to use a long speaker run, with processor and amps located in an equipment rack. The alternative is to use balanced cables from a processor in the rack, and locate a 6-ch power amp in the theatre front for the L, C, R and also a stereo amp (large) for the passive subs. From a neatness perspective, I would prefer to run speaker cable and keep all the electronic gear in the one location, with good ventilation/fan use outside of the theatre walls. I am getting advice on the build and the design. However, this is an issue which I haven't yet broached with people I trust. Hence my question to you. Is a balanced solution going to be that much better/needed for some reason vs speaker cable (14 AWG)? The cable run will be about 15 metres. Thanks. More later. Benje At this time I have one question for 4 Link to comment Share on other sites More sharing options...
cdave Posted February 25 Share Posted February 25 The Hyperphonix 45s are rated as 8ohm. So 14 gauge should be fine for 15m. 2 Link to comment Share on other sites More sharing options...
Benje Posted February 26 Author Share Posted February 26 @cdave The MX-40 LCR and passive subwoofer modules are also rated at 8 ohm impedance. They are the speakers with the long run. Thanks for the simple advice. Benje 1 Link to comment Share on other sites More sharing options...
frankn Posted February 26 Share Posted February 26 @Benje assume that you are in discussion with Krix about the best way to connect their system in your installation. Since the cabling will presumably be in wall, then you won’t have a 2nd chance to vary things if there is a problem? For a small cost, you could easily run the additional XLR interconnect cabling alongside the speaker cable. Then, if there is noise/signal degradation on the speaker cable, the XLR interconnect is already in place. 1 Link to comment Share on other sites More sharing options...
Benje Posted February 26 Author Share Posted February 26 @frankn and power cables as well ........ I expect to speak with KRIX again shortly. 1 Link to comment Share on other sites More sharing options...
frankn Posted February 26 Share Posted February 26 Sounds like a great project. I’m sure the final result will be spectacular Link to comment Share on other sites More sharing options...
frankn Posted February 26 Share Posted February 26 9 hours ago, Benje said: @frankn and power cables as well ........ I expect to speak with KRIX again shortly. Don’t run the power cable and speaker cable side-by-side. Link to comment Share on other sites More sharing options...
Benje Posted February 26 Author Share Posted February 26 (edited) NO! Actually, your advice and cdave's has clarified what I will do, and what I can do if I get problems subsequently. I'll install the amps in the rack, and have a long feed with 14 AWG to the front speakers. These will be wired around the rear and left of the theatre in a sub-attic (there is a large open-air space under the roof surrounding three sides of the theatre). The speaker wire will be kept away from power. The sub-attic is about 3 metres by 3 metres with a diagonal roof. Easy to work in and / or store 'stuff'. In the event that I have problems with noise/degradation etc, then I can use XLR cables on the outer wall where the speaker cables will be, and come out by the front speakers. There is power there already that can run the front amps if they are relocated. you should visit frankn - I'll call you. Plenty to discuss. Benje Edited February 26 by Benje 2 Link to comment Share on other sites More sharing options...
cdave Posted February 26 Share Posted February 26 Benje there may be an argument for locating the sub Amps closer to the drivers and/or using a thicker speaker cable, due to the higher power demands and increased driver control. Krix will be in the best position to advise you. An exciting project, I'm sure it will sound amazing! Enjoy Link to comment Share on other sites More sharing options...
Benje Posted August 16 Author Share Posted August 16 Heaven is getting close. Carpet is getting laid, a pallet from Krix will be delivered shortly, A 45 RU rack has a home awaiting arrival and installation, lots of amps ready to go. More to come, but the 9.4.4 system with an Anthem AVM 90 processor and a KRIX MX-40 speaker wall plus a Sony laser should be epic. And the Buchardt Audio a700's downstairs will be a great acive, wireless and minimalist stereo system for tor the main living space. Just a little longer to go! Benje 6 Link to comment Share on other sites More sharing options...
Hi-Fi Whipped Posted August 24 Share Posted August 24 On 16/8/2023 at 10:09 PM, Benje said: Heaven is getting close. Carpet is getting laid, a pallet from Krix will be delivered shortly, A 45 RU rack has a home awaiting arrival and installation, lots of amps ready to go. More to come, but the 9.4.4 system with an Anthem AVM 90 processor and a KRIX MX-40 speaker wall plus a Sony laser should be epic. And the Buchardt Audio a700's downstairs will be a great acive, wireless and minimalist stereo system for tor the main living space. Just a little longer to go! Benje Does sound like a very epic system mate, look forward to some pics Link to comment Share on other sites More sharing options...
Benje Posted August 29 Author Share Posted August 29 What do you do with 5 huge cartons that housed an krix mx-40? well travelled, from Hackham to thornbury Victoria and then to back to SA toNorwood. well packed, boxes unmarked. Could store them in the attic, could try and find a home, could dump them (NOooo !) definitely a first world problem. anyhow, pictures of the boxes below, and the placement into ‘Heaven’. Thanks Selby and @Krix Loudspeakers 5 1 Link to comment Share on other sites More sharing options...
a.dent Posted August 29 Share Posted August 29 All the photos I've seen of the Krix subs have them the way you have arranged them with the driver on top on one side and bottom other side. I've alway wondered why Krix advise to install them that way? Link to comment Share on other sites More sharing options...
Satanica Posted August 30 Share Posted August 30 41 minutes ago, a.dent said: All the photos I've seen of the Krix subs have them the way you have arranged them with the driver on top on one side and bottom other side. I've alway wondered why Krix advise to install them that way? Perhaps they consider it better to have some randomisation and have them slightly further apart rather than symmetrical and closer to each to other. That latter which can lead to one "super-sub" which is probably not so good for in room response rather than true "multi-sub". 1 Link to comment Share on other sites More sharing options...
Krix Loudspeakers Posted August 30 Share Posted August 30 Hi @a.dent - good question. It's a design choice where we offset the subs to try not to excite the same room modes. In the given space behind the screen, we try to do as much as possible to improve the performance - however this is still only a small detail and performance will largely be dependent on the room dimensions and interactions. 1 Link to comment Share on other sites More sharing options...
RCADees Posted August 30 Share Posted August 30 Oh MAN!!! What an awesome Cinema you are going to end up with here. Thanks for the photos, love the boxes! Congratulations!!!!! Very exciting indeed!!!! Link to comment Share on other sites More sharing options...
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