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DTA 1
Digital
to
analog
Processor
OWNER’S MANUAL
DESIGN
,
FEATURES
I
Thank you for purchasing the Soundstream
DTAl
.
You now own
the finest automotive Digital to Analog processor made, a precision
component with audiophile performance.
For maximum performance, we suggest you take a few moments
to read through this manual, to better acquaint yourself with the
design features and capabilities of your new
DTAl
.
This Soundstream product is the result of the combined efforts of
Krell Digital and Soundstream Technologies. It is made with
American craftsmanship and the highest quality control standards, to
provide you with many years of listening pleasure. To further help
protect your investment and to aid us with service questions, please
fill in and retain the following requested information:
Model Number:
Serial Number:
Dealer’s Name:
Date of Purchase:
Date of Installation:
We’ve designed the DTAl (as shown in Figure 1) to be an audio-
phile replacement for the standard digital to analog (D/A) proces-
sors found in many of today’s mass-marketed, CD and DAT mobile
components. When you bypass your source’s D/A circuits and route
the digital output to the
DTAl,
your mobile audio system will be
greatly enhanced by these features:
l
18-bit
Digital Processor with 8x Oversampling Digital Filter
-
this high-performance processor resamples the incoming digital
signal to create an 8x oversampled, 1
a-bit
datastream. With 8x
oversampling, more data points are added to create a more accu-
rate waveform. This allows the use of a simpler, better-sounding
analog filter at the converters’ outputs, for precise analog signal
reconstruction.
l Hybrid Digital to Analog Conversion
(DAC)
System
-
our unique
combination of traditional, oversampled “ladder” and newer
“1 -bit” DAC technologies. Resampled data is split up and han-
dled by two separate converters per channel, working in parallel.
The result is an accurate analog conversion with the lowest possi-
ble noise and distortion specifications.
2
Figure
I
l tine level Analog Output Stages
-
to amplify the analog signals
coming from the
DACs.
This Krell preamplifier has all-discrete,
Class A outputs that feature low-output impedance to drive long
cable runs. The design also includes a modified version of Krell’s
proprietary home audio grounding system, with separate analog
power supply to insure minimal digital signal crosstalk. With it
you’ll hear cleaner, more transparent music reproduction without
annoying low-level digital artifacts.
l Three Inputs with Priority Switching
-
for connection to digital
input signals. One input uses an Optical connector for interface to
industry-standard fiber-optic cable in lieu of coaxial cable. The
other two inpuk connect to standard 75 ohm coaxial cables ter-
minated with RCA connectors. The
DTAl
is compatible with CD,
DAT, and the new DCC digital cassette formats at both 44.1 and
48 kHz sampling frequencies. Through clever sensing circuits, the
DTAl
will automatically choose the Optical input as the source
whenever a signal is present at that connection (as explained in
the Installation section). Similarly, for the 75 ohm inputs, input 1
has priority over input 2. Switching between sampling frequen-
cies is transparent.
l Quality Construction -we use only premium parts to build each
DTAl,
including double-sided masked glass epoxy circuit boards,
polypropylene capacitors, gold-plated RCA input/output connec-
tors, and a rugged heavy gauge steel enclosure.
l
Simple
lnstdation
-
the
DTAl
can be mounted in any convenient
location inside the vehicle with four sheet metal screws. The DTAl
obtains power from the standard
12
Vdc automotive electrical
system and uses the audio system’s remote turn-on voltage for cir-
cuit activation. Once installed, the
DTAl
operates automatically
without any need for adjustments or controls.
3