Some additional details are found here: https://www.audiosciencereview.com/forum/index.php?threads/trinnov-altitudeci-review-and-32-channel-build-thread.71992/
Room Details:
Well treated 12.5 foot x 14 foot room. For the 5 bed speakers, I have treated the first reflection points on all walls and ceiling. There is also numerous bass traps as well. Bass is +/-1dB down to below 20Hz, and will do 20Hz at 96dB SPL with only .6% THD (acoustically measured at the center seat).
Equipment Details:
DACs, Amps and processor:
Trinnov AltitudeCI 32 Channel
17 Benchmark AHB2's
16 Benchmark DAC3 B's
Benchmark HPA4 Headphone/Line Amplifier
Custom Watercooled PC:
Custom machined chassis, VFD display, 4k UHD drive slim drive, AMD threadripper processor
RME HDSPe AES 32-Channel AES/EBU PCI Express Card (used for PCM music playback)
NVIDIA GeForce RTX 2080 Ti (used for movie and Atmos album playback)
Subs and Speakers:
4 JL Audio F212 subs
4 JL Audio F113 subs
4 Klipsch Palladium P39f Floorstanding Speakers
1 Klipsch Palladium P-27c Center Speaker
6 Klipsch Palladium P-17b Bookshelf Speakers (with 1/4" custom made steel mounts)
Signal Routing:
As JRiver offers custom zone management, I created three zones: Trinnov HDMI, RME 2 CH AES, and RME 5.1 CH AES. I wrote a custom home automation driver from scratch that gives me full control over the AltitudeCI, along with a custom JRiver plug-in that sends commands to my home automation server to switch the CI between HDMI and AES just prior to track playback.
This actually works very well and allows me to use AES for all FLAC files, while automatically switching the CI's audio source to HDMI when playing movies, Atmos albums, or any other content that requires bitstreaming.
All signals originate from the PC through either HDMI or AES. Note that the AltitudeCI cleverly allows the HDMI video signal to remain active while using the AES inputs for audio.
All digital processing is done internally inside the AltitudeCI. The AltitudeCI then outputs 32 AES channels to 16 Benchmark DAC3 B's. Some of the DAC3 B's have their internal passive attenuation jumpers set to various levels 0 dB, -10 dB, or -20 dB.
This allows me to set the analog gain structure up in the analog domain, rather than throwing away level digitally upstream. That lets me reduce the DAC’s output voltage where I don’t need the full +24 dBu of analog output, while attenuating the DAC’s signal and the DAC’s own analog noise together. The goal is to better match the downstream device sensitivity, whether that’s the JL subwoofer inputs (note that the v2 subs run hotter than the v1 subs) or the AHB2’s 9.8 Vrms input requirement. A good way to think about it is that I’m not running excess gain and then compensating for it with large digital cuts. The result is cleaner gain structure, lower absolute noise at the driver, and better use of the available digital headroom.
Digital Headroom Management:
I also use JRiver to analyze all my FLAC files, then use the Maximize Volume for Peak Level Normalization option along with the DSP option Peak Level Normalize. This ensures the existing dynamic range stays intact, but the track levels are raised so that the sample peak for each track is 0.01 dBFS below 0 dBFS. If there are inter-sample overs (ISOs), they will not impact the processing inside the AltitudeCI because it uses 64-bit floating-point math internally and even preserves the source sample rate (many other processors do not). At the DAC stage, the Benchmark DAC3 Bs have an additional 3 dB of internal headroom that can easily accommodate ISOs.
This method also preserves valuable digital headroom at the AES outputs of the AltitudeCI, because I no longer have to turn the volume up by 6 dB, or in some cases even close to 20 dB, simply to compensate for tracks that were recorded and mastered at very low levels. I now have much more headroom and can easily achieve 120 dBC or higher in my room, which I rarely do for obvious hearing-safety reasons.
Channel Routing and Analog Headroom Management:
I've finally documented the complete DAC and amplifier mapping for my 32-channel Trinnov Altitude CI system. The setup uses 16 Benchmark DAC3 B DACs, 17 AHB2 amplifiers (5 stereo and 12 bridged), eight JL Audio Fathom subwoofers, and a Benchmark HPA4.
One particularly useful feature of the DAC3 B is its configurable output attenuation, including independent settings for the left and right channels. I'm using -10 dB pads on the midrange channels feeding the stereo AHB2s. This attenuates both the audio signal and the DAC's analog output noise by 10 dB, further lowering the noise floor at the midrange drivers while keeping the relative channel levels more closely matched within Trinnov. I'm also using -10 dB pads on the DAC outputs feeding the three Fathom F113v2 subwoofers to better match their levels to the older v1 models.
For the tri-amped bed layer, I'm running the AHB2s in bridged mono for the woofers and stereo for the midrange/tweeter pairs. Bridging provides substantially greater power and voltage swing for the more demanding low-frequency drivers, while stereo operation offers ample power with 6 dB less voltage gain than bridged mode. This helps balance the different driver sensitivities, reducing the amount of level compensation required in Trinnov and making better use of the available gain structure and headroom.
Note that the center channel is technically quad-amped rather than tri-amped. Its smaller woofers are less efficient than those in the P-39Fs, so I added a second bridged AHB2, giving each center woofer its own dedicated bridged amplifier. This provides greater flexibility for independently managing the center woofers' levels and headroom. The additional amplifier was necessary after encountering clipping during the particularly demanding opening sequence of Mad Max: Fury Road.
Another major advantage is Trinnov's flexible channel routing, which allows virtually any speaker channel to be assigned or remapped to AES, analog, or Dante outputs as needed. That flexibility, combined with the DAC3 B's independently configurable output attenuation, makes managing a system with this many separately amplified drivers considerably easier.
Cabling:
All cables going to the DACs, amps, subs and speakers were handmade to be the exact length needed by me. It was kinda fun for a while after making cables, but once you make 116 of them, it gets old.
Digital AES cables:
16 Canare DA206 110ohm cables with Neutrik gold plated XLR connectors goes out to each Benchmark DAC3 B from one of two Avid DB25-XLRM 4 ft DigiSnakes that are connected to the Trinnov AltitudeCI. Each DA206 110 ohm cable terminates into a Canare BCJ-XJ-TRC 110 Ohm to 75 Ohm digital audio impedance transformer. I then made 16 Canare LV-61S RG59 75 Ohm coax cables, using Canare BCP-C4B BNC connectors and Canare RCAP-C4A RCA connectors that connect to each Benchmark DAC3 B.
Analog XLR cables:
I made 32 custom-length analog cables using Canare L-4E6S Star-Quad cables, with gold-plated Neutrik XLR connectors at both ends. The star-quad geometry provides excellent rejection of magnetically induced interference, as demonstrated in this video, while the dense braided copper shield provides excellent protection against electric-field interference.
Speaker cables:
The speaker cables used were made from JSC Wire & Cable #2220, comprised of 12 gauge, oxygen free copper. Almost all long cable runs are Canare DA206 110ohm digital AES cables. This allows for much shorter speaker cable runs, thus improving the overall system damping factor. Due to this, for the bed layer speakers, the speaker cables are as short as possible, as the racks are distributed throughout the theater, beside the bed layer speaker they are driving.
Trigger cables:
All trigger cables were custom made to the exact length as well. I used Neutrik rean NYS226BG 3.5mm mono plugs.
Power cables:
Tripp Lite P007-L02 locking power cables were used at on all devices, cut to length, keeping the factory locking mechanism. I used Leviton 15 Amp straight blade 5256-BVO plugs, orange (I just liked the color).
Conclusions:
The Trinnov AltitudeCI does a great job at actively tri-amping, but needed some manual setup. The CI absolutely corrects any phase rotation from the LR4 filters I used very well. Conventional subwoofer setup worked fabulously after a few tweaks, yeilding +/-1dB to just below 20Hz, without even using WaveForming, which I assume could work even better if my room was large.
Imaging and sound staging are the biggest I've heard in my room. And now that I can listen to Atmos, I've been very impressed with several tracks. Even stereo midrange and image are absolutely breathtaking.