Soundstream Stealth 1200D, Stealth STL4.320, Stealth 620, Stealth STL2.350, Stealth STL2.560 Owner's Manual

Stealth Amplifier Series

Owner’s Manual

CONGRATULATIONS !

You now own a Stealth Amplifier, the product of an uncompromising design
and engineering philosophy. We suggest you take a moment to document
the information below, which will be helpful in the event of theft or if
service is needed. Please retain this manual and your sales receipt for
future reference.

SOUNDSTREAM amplifiers are the result of American innovation and 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 your
information on the following lines to refer to in the event that you may

need it later.

Serial# ___________________________
Dealer's Name______________________
Date of Purchase____________________
Installation Shop____________________
Installation Date ____________________

CAUTION !
Prolonged listening at extremel y high levels may result in hearing loss. Eve n though your new Soun dstream
Stealth Amplifier sounds better than anything you've heard, exercise caution to prevent hearing damage .

FEATURES

l STACKABLE INSTALLATION.
l COMPACT SIZE AND TINY FOOTPRINT.
l DOUBLE SIDE PCB AND SMD COMPONENTS.
l FULL MOSFET DESIGN.
l LPF AND SUBSONIC CROSSOVER.
l ADJUSTABLE BASSBOOST FREQUENCY AND LEVEL.
l INFINITELY VARIABLE PHASE CONTROL FOR MONO MODEL.
l ACTIVE X-OVER FUNCTION.
l HEAVY-DUTY ALUMINUM ALLOY HEATSINK.
l HIGH (Speaker) OR LOW (RCA) LEVEL INPUTS.
l OVERLOAD, OVERHEAT, HIGH/LOW VOLTAGE PROTECTION.
l RoHS COMPLIANT.

FEATURES

CONTROL FUNCTIONS

1. SPEAKERS

Connect speakers/subwoofers to these terminals. Be sure to check wire for proper

polarity. Never connect the speaker cables to chassis ground.

2. +12 Volt Power

Connect this terminal through a FUSE or CIRCUIT BREAKER to the positive terminal of

the vehicle battery or the positive terminal of an isolated audio system battery.
Warning: Always protect this power cable by installing a fuse or circuit breaker of the

appropriate size within 18 inches (45cm) of the battery terminal connection.

3.Remote Turn On

This terminal turns on the amplifier when (+)12 volt is applied to it . Connect it to the

remote turn on lead of the head unit or signal source.

4.GND

Connect this cable directly to the frame of the vehicle. Make sure the metal frame
has been stripped of all paint down to the bare metal. Use the shortest distance possible.
It is always a good idea to replace the factory ground at this time with a larger cable equal
to the new amplifier power cable or larger. CAUTION: Do not connect this terminal directly
to the vehicle battery ground terminal or any other factory ground points.

5. RCA input jacks

These RCA input jacks are for use with source units that have RCA outputs. A source
unit with a minimum level of 200mV is required for proper operation. The use of high
quality twisted pair cables is recommended to decrease the possibility of radiated noise
entering the system.

6. High level inputs

The high level inputs are for use with speaker level wiring. Some source units do not
have RCA outputs, so use this terminal for speaker level signal input. CAUTION: Never use
high level input when RCA inputs available.

CONTROL FUNCTIONS

7. REMOTE

Connect the remote controller to control the subwoofer amplifier volume from the

driver seat location, for ease of adjustment during playing.

8. LEVEL Control

The level control will match the amplifiers sensitivity to the source units signal
voltage. The Operating range is 200mV minimum to 5V maximum. This is NOT a volume
control!

9. Low Pass Filter Control (Mono)

This control is used to select the desired low pass x-over frequency. The frequency
can be adjusted from 40Hz to 220Hz for all bass mono models.

10. Subsonic Filter Control

This control can filter out unwanted low frequency from 10Hz (OFF) to 50Hz. This
function will increase the power handling of your woofers.

11. Bass Boost Frequency and Level Control (Mono and 2-ch)

By adjusting these two knobs, you can boost a wanted frequency to a wanted level.
The center boost frequency is adjustable from 30Hz to 90Hz, the boost level is adjustable
from 0dB to 12dB.

12. Phase Control

This control can adjust speaker output phase from 0 to 180 degrees infinitely to
match your system phase characteristics.

13. X-over mode and frequency Control (4-ch)

These controls allow control over the frequencies played for the front channels.
There is an option for Low Pass, Full Range or High Pass. In LP or HP mode the frequency
range is from 50Hz to 4kHz.

CONTROL

FUNCTIONS

CONTROL FUNCTIONS

14. X-over mode and frequency Control (4-ch)

These controls allow control over the frequencies played for the rear channels.
There is an option for Low/BandPass, Full Range or High Pass. In HP mode, the frequency
range is from 15Hz to 500Hz. In LP mode, the frequency range can be switched from 50Hz
to 800Hz, or 250Hz to 4kHz. In the higher range, the LPF can be set at 4kHz for a midbass
while the front channels are also set at 4kHz for a tweeter resulting in a 2-way xover and
eliminating the need for a passive xover. Even with a set up like this, the midbass can still
be protected by the HPF which is not defeatable. It can be set anywhere in the 15Hz to
500Hz range creating a bandpass filter for the midbass by eliminating any damaging lower
frequencies in the subbass region.

15. Bass Boost Level switch (4-ch)

This switch can boost bass level by 0dB, 6dB or 12dB. The boost frequency is
centered at 50Hz.

16. Input mode switch (4-ch)

This function is for switching the rear channels' signal path. When switched to 4CH,
all 4 RCAs inputs are required. When switched to 2CH, the rear channels get their signal
input from the front channels in parallel.

17. X-over mode and frequency Control (2-ch)

These controls allow control over the frequencies played for STL2.350 & STL2.560.
There is an option for Low Pass, Full Range or High Pass. In LP mode the frequency range is
from 50Hz to 200Hz, In HP mode the frequency range is from 15Hz to 200Hz.

18. Power Indicator

This LED will light up when amplifier works properly.

19. Protection Indicator

The red LED will light up and will be flashing if there is a fault presented to the
amplifier. Please disconnect the amplifier and resolve the fault before reconnecting the
amplifier.