Slim

• At just 4.1 inches tall, the Marantz NR1601 spec list includes such amenities as a backlit learning remote, four version 1.4 3D-ready HDMI inputs, a USB input for use with iPhones and iPods, and decoding of advanced audio codecs, including Dolby TrueHD and DTS-HD Master Audio.
  
  

Slimmer

• The Azur 540R from Cambridge Audio, a 6.1 channel AV receiver that measures just 3.9 inches in height, features Dolby Digital 5.1, DTS 5.1, Dolby Digital EX 6.1, DTS ES 6.1, Dolby Pro Logic and Dolby Pro Logic II decoding. Inputs and outputs include component, S-Video and composite connections, electrical and optical digital inputs and outputs, 6.1 analog inputs and outputs, and six line level inputs with a tape monitor.
  
  

Slimmest

• Only 2 7/8 inches in height, the Sherwood R-904N 7.1 channel AV receiver includes advanced HD Audio decoding for Blu-ray discs, seven DSP modes, one-touch automatic speaker setup, three HDMI inputs, and 192kHz/24 bit digital-to-analog converters for all seven channels.