Alpine F#1 Status CDA 7990R User Manual page 6

High-precision signal transmission to maintain high quality
sound information. All design factors, including contact
resistance, noise effects, durability and matching, are opti-
mized for the in-vehicle environment.
4V PREOUT improves the S/N ratio by cutting off noise effects and restricting ampli-
fier gain
The high voltage output level allows reduction of amplifier gain. Therefore, any noise induced in the
RCA lines to the amplifier will not be amplified as much.
"High-performance RCA connector/power terminals" with outstanding durability and
anti-vibration performance, as well as less propensity to contact resistance and noise
The RCA connectors, and power terminals are all critical factors for sound reproduction quality. This
awareness is carefully reflected in the designs of these devices. For example, the contact faces are
machined with high accuracy and high attachment pressure is provided to the connectors. The power
terminals, with their thick gold plating, are high attachment pressure types optimized for high voltage
design.
They exhibit improved durability against vibration and external shocks, thus reducing the possibilities
of sound quality deterioration caused by contact resistance.
Custom developed RCA cables use a titanium-containing heat resistant insulator for
powerful bass frequencies and gentle, clear mid-to-high frequencies
Alpine teamed with Monster Cable to develop an original RCA cable with excellent bandwidth
balance that can transmit high-quality sound signals completely with no loss. To attain a good balance
across the different bandwidths of sound signals, hybrid stranded wire is adopted for the cable. The
wire itself uses both PCOCC (Pure Copper by Ohno Continuous Casting process) and Hi-OFC (Hi-
Oxygen Free Copper) wires. Inner and outer strand layers adopt different winding techniques, one to
optimize the bass and the other to optimize high freqeuncies. Moreover, this stranded wire is covered
with a high durability insulation material made from a titanium compound, providing the RCA cable
with heavy-duty specifications to meet the severe on-vehicle environment (including severe tempera-
ture changes). The appearance of this thick cable also gives a feel of power and grace as well as
improves the scale of the reproduced sounds.
Digital optical output accommodating high-quality sound data transfer to external
units with minimal deterioration
Digital fiber optic output offers a precise, interference-free transmission of digital data to outboard
sound processors. The CDA-7990s output offers an even more precise data output than the normal
system. The improvements in the CD transport mechanism provide a cleaner data signal to start with,
with a large reduction in transition timing errors (jitter) found with conventional transports. Addition-
ally, a hand-picked DIT (digital interface transmitter) ensures that the data is transmitted optimally.
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