Audio, sorry mini/power supply, RAID and two of three subwoofers not shown, a Two-channel Audio System by JLM

Room Size
21 ft x 13 ft x 8 ft
System Overview
Room dimensions based on Cardas recommendations (Fibonacci ratios) with mid-field listening position, but the stars of the system are the JBL 708P active reference studio monitors with controlled directivity. The monitors are supplemented with (3) 10 inch subs placed semi-randomly around the room to provide dispersed bass sources. MacBook Air controls Mac mini that feeds a PS Audio DirectStream Junior (DSJ) DAC/preamp/streamer.
Music Preferences
Mostly jazz and classical small ensembles, but can range to symphonic, classic rock (50s - 70s), pop (50s-60s), historic jazz, easy listening, latin, and new age.
Room Description
This is my study, weathersealed/insulated exterior fiberglass door, insulated double staggered stud walls that adjoin storage spaces, flexible/insulated ductwork to the room, insulated ceiling, drywall walls/ceiling, short nap carpet and pad on concrete slab, no windows (basement). Three tall bookcases line the side walls act as diffusers. 2.5 ft x 4 ft notch into the back of the room. Front of the room is audio, rear is my office.
Acoustic Treatment
Ten GIK 244 panels set up along front, side, and rear walls to address primary room dimensional echo (52 and 83 Hz).
Listening Impressions
The high level of dynamics and detail provided that doesn't draw, it forces your attention. The subs provide all the deep bass needed relatively free of peaks and dips.
Media Storage
Techline 36"W x 30"H x 18"D cabinet with three full extension drawers can hold 750 CD's (located in another room since all music is ripped).
Other Comments
Three 20A audio dedicated circuits, each serve a single 20 amp cryo'd hospital grade Hubbell duplex receptacle. The three circuits are tied to a separate grounding rod. Underground electrical service to the house has its own transformer. House built in 2005 in a very small rural subdivision with all 20A circuits/12 gauge wiring and house wide surge protection. All 2005 or newer appliances. Whole house standby generator added in 2016. All this electrical power stuff either came with the house or was based on a 'while I'm at it' mentality. After nearly 50 years at this, don't believe in simple tweaks and don't much believe in differences in wires.
Digital Source
Mac mini: mid 2011 operating system: High Sierra 10.13.6 processor: 2.7 GHz i7 memory: 16 GB internal drives: 256 GB SSD (operating software, stripped down to audio essentials) & 1 TB SSD (music) external drives: Oyen RAID with (2) 1 TB SSD connect
Analog Source
Other Sources
Signal Processors
See preamp
PS Audio DirectStream Junior DAC/preamp/streamer, currently loaded with Snowmass firmware.
Power Amp
None, all speakers are active (built-in amps).
JBL 708P active reference studio monitors with 8 inch ported woofer and 1 inch tweeter in controlled directivity waveguide.
Three for dispersed bass sourcing. Two are PreSonus T10 professional 10 inch ported that plug into the DSJ via XLR then pass signal to the JBL's. Third sub is a purchased DIY: Creative Solution SD X10 10" servo woofer (Fs = 26Hz); SD 300 amp; 13" cubic
Speaker Cable
None as all speakers are active.
10ft Best-Tronics XLR to JBL's, 15ft Madisound XLR to T10 subs, and 35ft Madisound Preminum RCA to third sub.
Power Cables
Whatever came with the gear.
Timbernation 2 shelf rack and matching sand filled speaker stands.
Power Cond
None, see other comments above.
Tuning and Tweaks
Looking to try REW or Dirac Live
Other Components
Ear protection for use around power equipment.