Soundstream Technologies DTA 1 User Manual

DTA  
Digital to  
Processor  
OWNER’S MANUAL  
DTA 1  
Digital  
Processor  
OWNER’S MANUAL  
Thank you for purchasing the Soundstream  
.
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  
.
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:  
Figure  
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level Analog Output Stages to amplify the analog signals  
coming from the  
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.  
Model Number:  
Serial Number:  
Dealer’s Name:  
Date of Purchase:  
Date of Installation:  
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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-  
We’ve designed the  
(as shown in Figure 1) to be an audio-  
DESIGN  
FEATURES  
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  
,
minated with RCA connectors. The  
is compatible with CD,  
DAT, and the new DCC digital cassette formats at both 44.1 and  
48  
sampling frequencies. Through clever sensing circuits, the  
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.  
the digital output to the  
your mobile audio system will be  
greatly enhanced by these features:  
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Digital Processor with 8x Oversampling Digital Filter  
this high-performance processor resamples the incoming digital  
signal to create an 8x oversampled, 1 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.  
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Quality Construction -we use only premium parts to build each  
including double-sided masked glass epoxy circuit boards,  
polypropylene capacitors, gold-plated RCA input/output connec-  
tors, and a rugged heavy gauge steel enclosure.  
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Hybrid Digital to Analog Conversion  
System our unique  
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the  
location inside the vehicle with four sheet metal screws. The  
obtains power from the standard Vdc automotive electrical  
system and uses the audio system’s remote turn-on voltage for cir-  
cuit activation. Once installed, the operates automatically  
without any need for adjustments or controls.  
can be mounted in any convenient  
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.  
Wiring Layout  
In general, you should plan to connect the  
CONNECTIONS  
between the digital  
source and the control head unit, as shown in Figure 3. If you are  
using an equalizer or active crossover, be sure to insert the  
the chain before any of these components.  
in  
Determine how your vehicle’s wiring is laid out, and plan to run  
your new wiring along the same routes. sure to keep power wires  
away from audio signal wires. (NOTE: Wires containing audio  
signals can cross a power wire, but not run alongside it.)  
You can route the new wires under the carpeting, but make sure  
they do not interfere with the vehicle’s normal operation. Keep all  
Figure 3  
Figure 2  
Power Connections (Barrier Strip)  
Remote: Connect to control head unit remote turn-on.  
Ground: Connect to Chassis Ground.  
Electronic Crossover  
Connect to  
power to  
Digital Inputs  
Optical: Fiber-optic  
Vdc. An adjacent LED indicator confirms  
.
First Digital Input.  
1:  
2:  
RCA coaxial  
RCA coaxial  
Second Digital Input.  
Third Digital Input.  
Analog Audio Outputs  
Left: RCA audio Analog Left Output.  
Right: RCA audio jack Analog Right Output.  
Speakers  
Channel  
Automotive sound system installations can be tricky, especially for  
first-timers. For this reason, we recommend using o professional  
installer, who has the tools and, more importantly, the experience  
to do the  
right. If you decide to install the equipment yourself,  
we hope this manual will serve as a helpful guide.  
Aftermarket Source Unit  
(CD, DA J or  
Player)  
Recommended Signal Cables  
The  
of the available 3 digital audio connections. For best analog signal  
transfer, we recommend using Stereo Audio  
uses custom gold-plated RCA  
for analog and 2  
Cable, Streamline Audio Cable, or an equivalent premium cable.  
For digital audio connections, use a precision flexible 75 ohm  
cable like Soundstream’s  
1, 75 ohm Interconnect Cable, to  
Subwoofers  
insure accurate transmission of digital signals.  
7. Connect another (e.g., orange or aqua) wire from the Remote  
terminal to your control head unit’s remote turn-on connection.  
wires inside the vehicle, hidden from passengers. An exposed wire  
can inadvertently be pulled out, and may cause disconnection or  
shorting.  
NOTE: This connection enables the  
to follow a timed sequence  
for minimal turn-on and turn-off thumps and is required for circuit  
activation.  
location and Mounting  
The  
is compact in size and it generates virtually no heat. It  
can be located almost anywhere within the passenger compartment,  
8. Connect a red wire (18 gauge) from the  
0.75 A in-line (fast-blow) fuse, to a constant  
that it is “hot” even when the ignition is off. Try connecting it to the  
battery cable itself, or tapping into a power lead on the control  
head unit (see Figure 3).  
terminal through a  
Vdc source, so  
trunk, or storage area. However, do not install the  
in the  
engine compartment or in any outside location exposed to dirt and  
moisture.  
Use the  
the  
as a template to mark drill holes. Before mounting  
to your vehicle’s chassis, inspect the site for any hidden  
DTA 1 Operation  
brake or gas lines, wires, or cables.  
9. Turn on your control head unit, selecting a source connected to the  
and slowly increase the volume while listening to a familiar  
musical selection. With proper instollation, your  
After selecting a suitable location, mount the  
form the following connection steps:  
,
and then per-  
should pro-  
vide you with an increased sense of transparency and music repro-  
duction. There are no adjustments or controls.  
Connecting Audio Signal Cables  
1. Make sure power to your audio system is off.  
NOTE: If you experience problems at this point, review the installa-  
tion steps and check all your connections. If you are installing the  
2. Locate the Digital Output connector on the back of your CD or  
DAT control head unit.  
as part of a new system, try leaving the  
out of the chain  
until you get your entire system operating properly first. Then repeat  
3. Connect an appropriate length of RCA coaxial cable from the  
steps 1 through 8 to insert the  
system chain.  
once again into the audio  
source’s digital output to digital 75  
NOTE: If you use an optical link, connect an appropriate length of  
the Optical input  
input 1 on the  
fiber-optic cable from the source’s digital output  
on the  
ber that the  
.
However, if you are installing a second source, remem-  
uses automatic priority switching to select signals  
Your  
is protected by a limited warranty. Please read the  
enclosed warranty information carefully. Should any problem occur,  
contact your local Soundstream dealer.  
at Optical input over those present at the 75 ohm inputs, 1 or 2.  
Also, input 1 has priority over input 2. However, CD players not  
equipped with o Remote On/Off control will continue generating  
digital sync code which will be sensed by the  
of player is part of your installation, we suggest connecting  
unit to a lower priority input via RCA cables.  
If this type  
8x Oversompling,  
32 44.1  
5 Hz to 20  
hybird  
SPECIFICATIONS  
Sampling Frequency  
Frequency Response  
48  
0.25  
4. Repeat steps 2 and 3 to connect an additional CD or DAT control  
head unit.  
A-weighted  
S / N  
Dynamic Range  
THD  
96  
5. Connect an appropriate length of high-performance stereo RCA  
audio cable from the Left and Right analog audio outputs on the  
to the CD or Aux input of your head unit or preamp in your  
mobile system chain (see Figure 3).  
20 Hz to 20  
Channel Separation  
Minimum Recommended Load  
output  
1
2Vrms  
Connecting Power Wires  
6. With power still off, connect a black wire (18 gauge) from the  
Ground terminal to a good chassis ground (e.g., bare metal or bolt,  
not painted or coated).  
Dimensions  
6

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