After removal of built-in amp and addition of 3-way crossover but before the increase in dampening foam and sealing of bass-port, turning old 30$ PC stereo into equivalent of >380$ in audio quality.
"Arsenal": an utilitarian zero-RGB desktop
Built for longevity with most resilient "consumer" components in "low-to-middle" price-range.
All LEDs are stripped or plastered, except for amp's on/off (to avoid rocking the neighbourhood by mistake).
RAM is 4x4GB of ECC (72-bit) unbuffered DDR3-1600 modules that showed to be capable of running at 2000Mhz (2x Kingston KVR16E11S8/4 + 2x Samsung M391B5273DH0-YK0).
SSD is actually Apacer Z280 240GB MLC NVMe in PCIe*4-to-M.2 adapter with radiator and fan. SATA HDD boot partition is used to force-boot from NVMe since GigaByte's abandonware BIOS is incapable of finding it.
GPU's BIOS is customized to limit power usage to 90-120W in 90-100% load by limiting voltage & frequency but also allow unrestrained current bursts.
The secondary, TN-based monitor is actually BenQ GW2320HDB modded from CCFL to non-PWM LED backlight.
Audio is Weiliang/Breeze Audio SU0 [32bit XMOS USB + AK4490 DSD/PCM + LM4562 op-amp] DAC + FX-Audio FX502SPRO [TPA3250 + 2x LM4562] Amp + Sven MA-332 [active 2-way 2x20W with open bass-port modded to be passive 3-way 2x70W with sealed bass-port] speakers & Sennheiser HD 215 DJ headphones + stereo lapel microphone from AIWA portable tape player/recorder.
The case is pre-USB3 non-plus Z11. It has dust filters on all intakes but tends to have negative pressure (thus sucking air and dust via all holes and cracks) due to its big non-obstructed front panel with 14cm fan slot & empty 5" drive-bay's foam cover and 3x 12cm (+1 empty slot) exhaust fans.
Failed Arctic CPU fan is replaced with 92mm TITAN TFD-9225H12ZP/KE(RB), case fans are 2x 140mm Thermalright X-Silent 145 + 1x 120mm Arctic F12 PWM CO + 1x 120mm de-LED'ed Zalman's stock. Case's 80mm side-exhaust fans are disabled. Power limits and custom fan speed curves ensure quiet operation with under 70 degrees Celsius for all components under full load.
There is also laptop WiFi module in x1 mPCIe-to-PCIe adapter and PCI analogue A/V/TV/radio capture card.
There is supposed to be 1000VA (~600W) UPS but it's out of commission right now.
CPU should be upgraded to FX-8320E OEM ASAP and OC'ed to 4GHz on cores & 2,5GHz on cache & MMU.
OS is openSUSE Tumbleweed rolling-release GNU/Linux distribution.