"Originally announced as the Centris 660av in July 1993, The Quadra 660av got a name change in October, when Apple phased out the Centris name. It was one of the first Macs (along with the Quadra 840av) to integrate audio-visual features into its basic design. It was originally priced at $2300, making it Apple's first low priced AV option." (photo credit: Upgrading and Repairing Macs)

CPU
CPU: Motorola MC68040
CPU Speed: 25 MHz
FPU: integrated
Bus Speed: 25 MHz
Data Path: 32 bit
ROM: 2 MB
RAM Type: 72 pin SIMM
Minimum RAM Speed: 70 ns
Onboard RAM: 4 MB
RAM slots: 2
Maximum RAM: 68 MB
Level 1 Cache: 8 kB
Expansion Slots: 1 7" NuBus, 1 PDS

Video
VRAM: 1 MB
Max Resolution: 1152x870
Video Out: DB-15, s-video, composite
Video In: s-video, composite

Storage
Hard Drive: 160-320 MB
Floppy Drive: 1.4 MB SuperDrive
Optical Drive: optional

Input/Output
ADB: 1
Serial: 2
SCSI: DB-25
Audio Out: stereo 16 bit mini
Audio In: stereo 16 bit mini
Speaker: mono
Microphone: mono

Networking
Ethernet: AAUI-15

Miscellaneous
Codename: Tempest
Gestalt ID: 60
Power: 86 Watts
Dimensions: 3.4" H x 16.3" W x 15.6" D
Weight: 14 lbs.
Minimum OS: 7.1
Maximum OS: 8.1
Introduced: July 1993
Terminated: September 1994

This byte of Apple's history from Wired's,"30 Years of Apple Products."