Introduction to the KRELL Evolution 707
T
hank you for your purchase of the Evolution 707 Surround Sound Preamplifi er/ Processor. Coupling
legendary KRELL preamplifi er technology, state of the art digital processing, and the latest in HDMI
1.3 surround formats, the Evolution 707 is an uncompromising centerpiece for a reference music and
home theater system. Housed in a chassis normally reserved for Krell amplifi ers, each critical sub
circuit is given unrestricted space for maximum circuit density. Designed to take full advantage of the
lossless Dolby and DTS Master Audio sound tracks found on Blu-ray discs, the Evolution boasts the
most advanced circuitry ever employed in a surround sound preamplifi er/ processor. The Evolution
707 begins as a reference preamplifi er utilizing discrete current based Class A, direct coupled circuitry
for enhanced speed and ultra high signal bandwidth. All twelve Evolution 707 analog output stages
are built to the same exacting standard and support Krell CAST, balanced and single-ended cable
connections. At the heart of the Evolution 707 digital signal processing is a pair of dual core 32 bit
Crystal CS497004 DSP’s performing 1.8 giga operations per second. Video signals are treated with
equal care and are afforded isolated circuitry for broadcast quality transmission of signals up to
1080p/60Hz. A massive toroidal transformer, larger than in many amplifi ers, insures precise voltages
for the individual audio, video, processing, and control stages. These advanced technologies pair
elegantly to an interface confi gurable to a user’s preferences.
Features and Functions
The Evolution 707 includes 8.4 channels of audio output. In addition to the standard 7.1 channels
available in conventional surround sound processors, the Evolution 707 includes a second center
channel for positioning above and below screen applications and three additional subwoofer
outputs. Subwoofer options include multiple left/right, front/ back, and Low Frequency Effects
(LFE) options. Individual crossover settings for each speaker provide seamless integration between
subwoofer and main speakers. A powerful 1/3 octave digital equalizer completes the fi ne tuning by
tailoring individual speaker performance to listening environments that are less than ideal.
The Evolution 707 video circuitry is fully HDMI 1.3 compliant, supports 24 bit Deep Color content, and
is equipped with an onboard video scaler. With stunning clarity, this scaler up-converts incoming
analog video signals to a maximum of 1080p/60Hz over HDMI output or 1080p/30Hz via component
video output. A second video zone enables viewing of another video source simultaneously.
Evolution 707 software based core is readily updatable via a standard RS-232 computer connection if
improvements become available. One future update is room correction. Included with the Evolution
707 is a sensitive calibration microphone that will gather information from the listening environment
and suggest a set of calibrations for optimal performance. Once the software is completed, this will
be made available to all Evolution 707 end users at no charge.
The Evolution 707 is a sophisticated product with many operational options. This manual is divided
into several parts, detailing the various confi gurations and settings available in the Evolution 707.
