Pioneer PDSP-1
It has 254 individual speakers and digital amplifiers built in.

Compatible Audio Input Formats Digital inputs: PCM (mono/stereo), Dolby Digital, DTS
Analogue inputs: mono or stereo (converted internally to 24- bit 48 kHz PCM)
Optional Dolby Pro Logic II decoding to provide surround sound listening for all analogue and digital stereo sources
Audio and Video Inputs 1 x digital optical audio input (Input 4)
1 x analogue audio input L + R (Input 5)
1 x auto-sensing digital optical audio input and analogue L + R audio input (Input 2)
Each of these inputs provides associated S- video and composite video switching
Audio only inputs 1 x digital coax audio input (Input 1)
1 x digital optical audio input (Input 3)
Audio Outputs 2 x subwoofer analogue outputs
1 x optical digital S/P-DIF output, which passes the selected digital input (if any)
Video Output The selected Video Input (if any) is passed to the composite / S-video output, with the on-screen display superimposed on it
Third-Party Control Port and Service Connection RS-232
Sound Pressure Level Output Peak SPL 115 dB at 1 m at 1 kHz
Dimensions Width 963mm
Height 640mm
Depth 146mm
Weight (Including Grill) 50kg