Angina
A4
Power Amplifiers
Owner’s Manual
and
Installation Guide
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Table of Contents
You now own a Soundstream
promising design and engineering philosophy. Your Soundstream
amplifier will outperform any other amplifier in the world.
amplifier, the product of an uncom-
p 4
................................................
Design Features for the ANGINA
......................................................... p 6
7
Design Features for the A4
To maximize the performance of your system, we recommend that you thor-
oughly acquaint yourself with its
manual and your sales receipt for future reference.
and features. Please retain this
p 8 9
.............................................................
for the ANGINA
.....................................................................
for the A4
Soundstream amplifiers are the result of American innovation and
with the highest quality control standards. When properly installed, they will
provide you with many years of listening pleasure. Should your amplifier ever
need service or replacement due to theft, please record the following informa-
tion which will help protect your investment.
....................................
Crossover Adjustments for the ANGINA..
p 12
p 13
..............................................
Crossover Adjustments for the A4
...................................
Theory and Use
Hawkins Bass
Model and Serial
Dealer’s Name
Date of Purchase
Installation Shop
........................................................................................
Wiring
p
15
............................................................
Installation and Mounting
Level Setting and Trident Protection
p 16
...........................................
Date
Installation
p 17 20
p 21
.........................................................
.......................................................
Sample System Diagrams
Troubleshooting and Service
Specifications for the ANGINA
p 22
...................................... ...........
CAUTION!
Prolonged listening at high
Even though your new Soundstream
sounds better than you’ve ever heard, exercise
caution to prevent hearing damage.
may result in hearing loss.
p 23
...........................................................
Specifications for the A4..
2
3
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features of the
Features of the
(Speaker Load Adapting Subwoofer
High Level Input with terminal block connector will accept a speaker
level input. This allows the user to hook this amplifier up to any factory
headunit.
new dual function technology currently operates in two different ways
different models. In subwoofer applications the power supply tracks the
incoming audio signal and increases or decreases its own voltage level
to mirror the input. This design results in enormous low impedance, low
frequency stability and maximum efficiency, since no power is wasted
maintaining an unnecessarily high voltage level in the power supply.
Auto Turn On allows the amplifier to turn on without the use of a re-
mote turn on wire, when the amplifier is using the high level inputs.
Remote Wire Output provides a
amplifier.
volt output to turn on another
Protection Topology provides three types of protection:
1. Output protection against short circuits or improper loads.
2. Ground fault detection: Shuts down the amplifier when a significant
Line Level Output will allow the use of another Soundstream amplifier
to run the front speakers, while still retaining the factory head unit. This
voltage
Volts) fluctuation occurs between electrical (turn-on lead)
and battery ground.
3. Thermal Protection: Puts the amplifier into shutdown in extreme
thermal conditions.
option is only available when the high level inputs are used.
Hawkins Bass
provides a focused subwoofer boost
at 45Hz) and routes otherwise wasted amplifier power back to the au-
dible bandwidth.
Harmonic Bass
The 2nd and 3rd order harmonic peaks
are critically aligned to fundamental peaks at low frequencies. This pro-
duces tighter, more accurate bass reproduction.
Drive Delay
Amplifier section powers up 2 to 3 seconds after the
power supply eliminating turn-on pops. Turn off process is reversed:
Amplifier section turns off first, followed by the power supply.
All transistors are ideally located and sandwiched be-
tween the circuit board and the
fier operation.
to provide cool efficient ampli-
Differentially Balanced RCA Input eliminates ground loop related
noise in the audio path.
Variable Crossover Network
low pass filter that is se-
lectable at 60, 80 or 1
Symmetrical Discrete Balanced Class A Drive Board auto-adjusts
for linear performance while driving low impedance loads.
4
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Features of the A4
Desiun Features of the A4
Power Supply
Branched Impulse) Our new power
All transistors are sandwiched between the circuit board
to provide cool efficient amplifier operation in a smaller
supply eliminates “power sags” during low frequency reproduction by
rapidly increasing the duty cycle, stabilizing the power supply and allow-
ing it to deliver the power required when reproducing low frequencies.
Also, greater reserve gate power is now stored for low voltage conditions
that occur during extreme conditions.
and the
package.
Continuously Variable
Crossover Networks
low
pass crossover variable from 50 to
(Stabilized Apex Current
Reduces power supply
Built-in Staggered S.I.P. Crossover Networks Built-in high pass elec-
tronic crossover is designed to send high pass information to the ampli-
stress by 50%. Use of inverted channels usually degrades the stereo
image due to phase reversal of even order harmonic distortion that oc-
curs between the inverted channels. In the STACT design inversion is
done at the power amplifier drive stage. Since the fully symmetrical power
amplifier produces no even harmonic distortion itself and all preamp cir-
cuitry (which does produce even harmonics) is run completely in phase,
no even harmonic distortion phase reversal occurs.
fier with a
slope.
Flexible Input Level Control 200mV to
input sensitivity. Stereo
level control allows user to optimize system level control.
Symmetrical Discrete Balanced Class A Drive Boards Auto-adjusts
for linear performance in low impedance loads.
Protection Three types of protection for
amplifiers:
1. Output protection against short circuits or improper loads.
2. Ground fault detection shuts down the amplifier when a significant (5
volt or greater) voltage fluctuation occurs between audio ground and bat-
tery ground.
3. Thermal protection will shut the amplifier down in extreme thermal
conditions.
Hawkins Bass Control Provides focused subwoofer boost and routes
wasted subsonic power to the audible bandwidth. The A4 contains the
fixed Hawkins Bass Control which allows you to boost bass 6dB at
A built-in subsonic filter at 45Hz helps protect the speakers.
Harmonic Bass Alignment The 2nd and 3rd order harmonic peaks
are critically aligned to fundamental peaks at low frequencies. This pro-
duces tighter, more accurate bass reproduction.
Drive Delay II Muting
Amplifier section now powers up 2 3 seconds
after power supply, eliminating turn on pops. Turn off process is reversed.
Amplifier section turns off first, followed by power supply.
Dynamically Optimized Power Grid Power grid is now evenly dis-
tributed between primary and secondary power supplies, providing greater
dynamics and improved RF filtering.
6
7
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Cal/outs for the
Panel
for the
Front Panel
LP
X-OVER
1
1.
2.
Power LED Indicates amplifier power.
5.
Connected to a fuse or circuit breaker, then to the battery’s
positive terminal.
Subsonic Hawkins Bass Control Switch Select “Subsonic” to
engage the Subsonic filter at Select
engage the boost 45Hz for the
Remote In Remote turn-on input from the head unit. Accepts
6.
7.
channel.
Speaker Connection Terminal Speaker connections to the mono
3.
4.
Input Selection Switch Select “SPKR IN RCA OUT” to engage the
high level speaker inputs and the RCA’s become outputs to run to an-
other amplifier. Select “RCA IN” to engage the RCA’s as inputs.
sub channel.
High Level Speaker Inputs Left and right inputs from a speaker level
source.
8.
Low Pass XOVER Switch A selectable crossover frequency switch
at 60, 80 or 1
Inputs Right and left RCA inputs for the mono sub channel.
9.
10. Input Level
mono channel input level control.
11.
Fuse Main power supply fuse. Warning: Replace only
same
value fuse!
12. GND Main ground connection. Bolt to a clean chassis point in the
vehicle.
Remote Out Remote turn-on output to control a second amplifier.
13.
8
9
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for the A4
for the A4
Top Panel View
8.
9.
Remote Remote turn-on input from the head unit. Accepts
GND Main ground connection. Bolt to a clean chassis point in the
vehicle.
10. Speaker Connection Terminal Speaker connections for channels
and
2.
Subsonic Hawkins Bass Control Switch Select “Subsonic” to
11.
Low Pass Filter Control Adjustment Crossover frequency control
for the internal low pass filter.
engage the Subsonic filter at
engage the
Select ‘Hawkins Bass
boost 45Hz for the
channel.
12. Input Levels Stereo input level control for channels
Input Levels Stereo input level control for channels
14. RCA Inputs Right and Left channel RCA inputs for channels
Switch Select “ST” for normal stereo operation. “MO”
3.
for bridged mono operation with a single input signal (number 2 input
only). “LP” for low pass bridged mono operation with input from chan-
nels
13.
and
4.
5.
Switch Select “ST” for normal stereo operation. “MO”
for bridged mono operation with a single input signal (number 3 input
15. Crossover
High pass crossover frequency settings for ampli-
only).
nels
low pass bridged mono operation with input from chan-
fier.
Input Selection Switch Selectable inputs for channels
from
internal (channels
or external (channels
Bottom Plate View
------------
Front Control Panel View
6.
Fuse Main power supply fuse. Warning: Rep/ace on/y
the same
value fuse!
Connected to a fuse or circuit breaker, then to the battery’s
positive terminal.
10
11
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Crossover Adiustmen
Hawkins Bass Control
Subwoofer drivers in general
have excellent power
ANGINA CROSSOVER
The ANGINA is designed as a mono subwoofer amplifier. This means the
dling characteristics over
their operational bandwidth.
This bandwidth is deter-
mined by many factors, in-
cluding driver design, and
enclosure type. It is possible
to overdrive any subwoofer
driver by sending powerful
amplifier will direct 200 watts of pure hard-core bass to your subwoofers. It
handles these low frequencies with a Butterworth,
filter.
low pass
These low pass frequencies are directed by the three position switch which
sits on top of the amplifier as shown in the shaded area below. The switch
selects from the following three frequencies; 60, 80 or 1
Fr equency (Hz)
Figure 1
signals outside of its operational bandwidth. These potentially damaging sig-
nals can be removed by adding a subsonic filter. Figure 1 shows the effective-
ness of the Hawkins Bass Control on woofer excursion in a vented enclo-
Top View of the ANGINA
sure. The woofer travels
at
With Hawkins Bass Control prop-
erly adjusted, this excursion can be reduced to less than 1 mm. This is
great benefit to lowering woofer distortion and increasing output.
With Soundstream’s Hawkins Bass Control, the boost and frequency con-
trol can provide the “tailoring” needed for any type of “assisted” design and
any woofer in any type of installation.
A4 CROSSOVER
The A4 uses a
crossover functions (factory set at
using a
(Series
Package resistor network) for high pass
However, the low pass is adjusted
The Angina and A4 amplifiers share the same fixed Hawkins Bass Control
technology. A two position switch on the top of the amplifiers control the
variable crossover that has a range of 50 to
as seen
‘Hawkins Bass
‘Sub Sonic’ filters as seen in the shaded area
in the shaded area below.
below. When the ‘Hawkins Bass Control is engaged a 6dB boost is applied
at 45Hz. The ‘Sub Sonic’setting will engage the
boost.
subsonic filter with nc
Front View of the A4
Top View of the ANGINA
IMPORTANT NOTE:
Top View of the A4
On
A4 amplifier, a full range signal can he achieved by removing
the entirely.
12
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A
LOCATION
POWER A ND GROUND
The
amplifier employs highly efficient circuitry, a custom-engineered
ensure maximum output from your
amplifier, use high quality,
amplifiers will
heat sink, and a unique Chassisink construction to maintain lower operating tem-
peratures. Additional cooling may be required if the amplifier is located in a tightly
confined area or when driving especially low impedance loads at extremely high
levels.
oss power and ground cables and connections. The
an 8 gauge power and ground cables. Determine from the chart below the
ninimum and maximum gauge power and ground wire for your application.
When mounting the amplifier, it should be securely mounted to either a panel in the
vehicle or an amp board or rack that is securely mounted to the vehicle. The
mounting location should be either in the passenger compartment or in the trunk of
the vehicle, away from moisture, stray or moving objects, and major electrical com-
ponents. To provide adequate ventilation, mount the amplifier so that there are at
least two inches of freely circulating air above and to the sides of it.
Angina
8
8
or 10 gauge
8
8
gauge only
gauge only
A4
or 10 gauge
CIRCUIT BREAKERS AND FUSES
MOUNTING THE AMPLIFIER
Using the amplifier as a template, mark the holes on the mounting surface.
Remove the amplifier and drill the holes for the mounting screws.
all audio components, the
fuse or circuit breaker must be located within 18” of the batterv. This will
amplifier must be fused near the battery.
fire in the event of a
use value.
cable. See the chart below to determine the correct
C.
Secure the amplifier to the mounting surface using the supplied hardware.
NTERNAL
Angina and A4 amplifiers are fused with automotive-type fuses.
n the event of blown power supply fuses, replace with the correct value fuse found
a.
b.
C.
d.
Run and connect the audio signal and remote turn-on cables to the ampli-
fier from the source unit.
Carefully run the positive cable from the amplifier to a fuse or circuit breaker
within 18” of the battery.
Connect the fuse or circuit breaker lead to the battery. Leave the circuit
breaker off or the fuse out until everything is bolted down.
Secure the ground cable to a solid chassis ground on the vehicle. It may be
necessary to sand paint down to raw metal for a good connection.
Double check each and every connection!
I
the chart below. Never replace the fuse with a higher value than what is
This may result in amplifier damage and void the warranty!
RUB/CON Amplifier Fuse Values
Amplifier Fuse
25 amp automotive
25 amp automotive
Battery Fuse /Circuit Breaker
Angina
30 amp
A4
30 amp
Reconnect the fuse or circuit breaker.
REMOTE TURN-ON
the “Remote” line to the turn-on lead from the source unit. When
is received, the amplifier will turn on. Note: Remote wire is not needed
vhen the Angina is using the speaker level inputs.
POWER UP
Power up the system and look at the Power LED; there may be a 2-3 second delay
from the time the source unit is turned on to the time that the LED on the amp turns
on, which is normal. Once the amplifier LED is on and the source unit is playing,
you should have sound coming from the speakers.
SIGNAL CABLE
Jse a high quality cable that will be easy to install and has minimal signal loss to
optimum performance.
IMPORTANT ANGINA NOTE:
SPEAKER CABLE
e initial power up connection will leave the amplifier power light on for abo
amplifiers will accept up to 8 gauge speaker cable. Use a high
flexible, multi-strand cable for best performance and longevity.
one minute after turning off. Normal operation will occur after that.
15
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Level
R e m o t e
Turn On
The input levels are adjusted by means of the input level controls located on the
front of the amplifier as shown below in the shaded area. This is a unique
stage circuit that adjusts both level and gain. This topology maintains better S/N
Ratio even when using sources with minimal output.
(after market radio)
In the ideal situation, all components in the audio system reach maximum undistorted
output at the same time. If you send a distorted signal to an amplifier, it is simply
going to amplify distorted information. The same holds true if an outboard pro-
cessor or crossover begins to distort before you have maximum output from the
amplifier. By setting all components to reach clipping at the same time, you can
maximize the output of your system. For the
steps for setting the input levels:
amplifier, follow these
Turn the amplifier’s input levels to minimum position (counterclockwise)
Set the source unit volume to approximately of full volume.
While playing dynamic source material, slowly increase the amplifiers’ input
level until a near maximum undistorted level is heard in the system.
2.
3.
Pro
Your RUBICONA4, ANGINA amplifiers are protected against both overheat-
ing and short circuits by means of main power fuses and the following
circuits:
Speaker Protection
Ground fault Protection
A fail-safe thermal protection circuit
16
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and A4
Complete
while
a Factory
CAUSE
PROBLEM
1. No power or ground at the
No Sound and power LED is not
lit
RADIO
amp
2. No remote turn-on signal
3. Blown fuse near the battery
1. No signal input
2. Speaker leads may be
shot-ted
No sound, power LED is lit
3. Speaker leads may be
referenced to ground
1. Speaker output may be
shorted to ground.
2. Speaker leads may be
shorted to each other. Check
continuity with a volt meter.
Amplifier output cuts on/off
repeatedly
Speaker or leads may be
shot-ted
Repeatedly blow amp fuse;
frequent activation of Trident
2. Amplifier load may be too low
3. Verify adequate amp
ventilation
protection or
Power
Supply Circuit
NOT’: you experience blown main power supply fuses, ii is
the amplifier is seeing a dead short, either in the
Rectify
problem before
speaker wire or in the speaker itself.
blowing
fuses! DO NOT increase values beyond the
original fuse vafue! Doing so
damage your amplifier.
void your warranty and may
Service
Your Soundstream
amplifier is protected by a limited warranty.
Please read and send in the enclosed warranty card.
21
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Specifications for the A4
for the
2
4
Stereo
Bridged
2
Mono
4
Mono
4
Stereo
MODEL
Angina
MODEL
(14.4 Vdc)
(12.6 Vdc)
(12.6 Vdc)
(14.4 Vdc)
I
I
A4
x2
THD
Signal to Noise
Frequency Response
Stereo Separation
Damping
THD
Signal to Noise
Frequency Response
Stereo Separation
Damping
to 20kHz
to
(-3dB)
NA
Input Sensitivity
Input Impedance
200mV to 5.0 Volts
1 Ok Ohms
200mV to 5.0 Volts
1 Ok Ohms
Input Sensitivity
Input Impedance
Crossover Specifications
Low Pass:
Cross0 ver Specifications
High Pass:
Full Range:
Removable SIP
Removing the SIP chips all together
Select between
and 1
Low Pass:
Hawkins Bass Control
Hawkins Bass Control “IN” is a
Sub Sonic filter frequency is at
Hawkins Bass Control
boost at
Hawkins Bass Control “IN” is a
boost at 45Hz
Sub Sonic filter frequency is at
Dimensions
ANGINA: 5.3” X
x D x
Dimensions
x D x
X 2.3”
X
X
2.3”
A4:
23
22
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