STA220 STA216 STA212 STA208 STA206 STA416 STA412
Contents
1. If the RCA outputs are not present connect the speaker outputs from the receiver to the high level input connector of the amplifier Be sure to observe polarity to avoid audio phase problems NOTE Do not connect BOTH the high level and low level inputs from your receiver to your amplifier at the same time 2 Channel Amplifiers STA206 STA208 STA212 STA216 and STA220 OW LEVEL INPUTS ET POWER AMPEPFIER To Speaker Terminals L R R of head unit 2 EHANNEE Remote Subwoofer Level Control 4 Channel Amplifiers ie E A To Speaker Terminals 1 1 2 2 a i 4 GHANNEI Mas MOSFET POWER AMPLIFIER io Low High SOHE Fase L_Fass FTEQHEAEP Ful Rangs LGW LEVEL NPETE Remote Subwoofer Level Control Cn OL To Speaker Terminals A yi pi ri Sooo of head unit STEALTH MOSFET Amplifier User s Manual page 7 Power and Speaker Wiring 2 Channel Amplifiers STA206 STA208 STA212 STA216 and STA220 RIGHT Speaker SPEAKER LEFT Two IMPEDANCE SPeaker Channel 2 8 OHMS Mode Chassis ground T point Connect the Positive terminal of the subwoofer to the R amplifier terminal to REMOTE TURN ON terminal of head unit Connect the Negative terminal of the subwoofer to the L amplifier terminal STEALTH MOSFET Amplifier User s Ma2. Two Channel MOSFET Car Audio Amplifiers STA220 STA216 STA212 STA208 STA206 Four Channel MOSFET Car Audio Amplifiers STA416 STA412 Congratulations on your purchase of a Sound Storm Laboratories STEALTH Amplifier It has been designed engineered and manufactured to bring you the highest level of performance and quality and will afford you years of listening pleasure Thank you for making Sound Storm Laboratories your choice for car audio entertainment page N on Oo GF A A Ph WO OBO N 10 11 12 13 14 15 USER S MANUAL CONTENTS Introduction What is included Features About 2 Ohm operation General precautions Installation precautions Mounting the amplifier Connecting the amplifier Low level input wiring High level input wiring 2CH Power and Speaker wiring 2CH Mode 2CH Power and Speaker wiring Bridged Mode 2CH Power and Speaker wiring TriMode 4CH Power and Speaker wiring 4CH Mode 4CH Power and Speaker wiring Bridged Mode 4CH Power and Speaker wiring TriMode Troubleshooting Specifications STEALTH MOSFET Amplifier User s Manual page 1 Introduction With the Sound Storm Laboratories STEALTH MOSFET amplifier series we are introducing seven new amplifiers all designed in the USA This new series includes five 2 channel and two 4 channel amplifiers All STEALTH models feature variable low pass crossovers and variable input gain controls
3. They also incorporate a fixed high pass crossover for added system flexibility For further flexibility in the use of a subwoofer 0 18dB Bass Boost control has been included on all amplifiers You can control the subwoofer level with the remote level control module Sound Storm Laboratories understands that amplifiers are placed in many different kinds of installations so we incorporated a very flexible system of controls in these amplifiers in order to help you integrate the amp into your system regardless of the nature of your input source STEALTH MOSFET Amplifier User s Manual page 2 What is included When first unpacking your new amplifier please check first that the package contains all of the items below If something is missing contact the store where you purchased the amplifier e STEALTH amplifier e Remote subwoofer level control eHigh input cable with connector e Four 4 mounting screws Features Your new STEALTH amplifier features the following e Class A B operation e Bridgeable outputs e Tri Mode capable e MOSFET PWM Pulse Width Modulated Power Supply e 2 Ohm stable stereo operation with output power increase e Thermal and speaker short protection e Soft turn on circuit e Remote turn on turn off circuit e Variable input gain control e Variable low pass crossover s e Fixed high pass crossover 200Hz e Variable 0 to 18dB Bass Boost e Nickel plated RCA low level and h
4. Manual page 14 Specifications MODEL RMS POWER into 4 Ohms MAX POWER into 2 Ohms BRIDGED POWER into 4 Ohms Min speaker impedance THD Frequency response Signal to noise ratio Channel separation Damping factor Crossover range low pass high pass Bass boost Fuse rating Dimensions 11 1 4 x 3 x MODEL RMS POWER into 4 Ohms MAX POWER into 2 Ohms BRIDGED POWER into 4 Ohms Min speaker impedance THD Frequency response Signal to noise ratio Channel separation Damping factor Crossover range low pass high pass Bass boost Fuse rating Dimensions 11 1 4 x 3 x Two Channel MOSFET Car Audio Amplifiers STA206 STA208 STA212 140W x2 170W x2 230W x 2 300W X 2 400W X 2 600W X 2 600W X 1 800W x 1 1200W x 1 2 Ohm Stereo 4 Ohm Mono Bridged 0 01 9Hz 50kHz 105dB 90dB 125 40Hz 150Hz 200Hz fixed Variable 0 18dB 20A x 1 25A X 1 25A X 1 6 5 8 9 11 Four Channel MOSFET Car Audio Amplifiers STA412 STA416 220W x 4 250W x 4 300W X 4 400W X 4 600W X 2 800W x 2 2 Ohm Stereo 4 Ohm Mono Bridged 0 01 9Hz 50kHz 105dB 90dB 125 40Hz 150Hz 200Hz fixed Variable 0 18dB 40A x 1 25AX 2 11 13 3 4 STA216 290W x 2 800W X 2 1600W x 1 20A x 2 121 2 STA220 360W x 2 1000W X 2 2000W x 1 25A x2 17 5 8 All specifications subject to change without notice STEALTH MOSFET Amplifier User s Manual page 15 Notes
5. circulation around the intended mounting location 3 Mark the location for the mounting hole screws by positioning the amplifier where you wish to install it Use a scribe or mounting screw inserted through each of the amp s mounting holes to mark the mounting surface If the mounting surface is carpeted measure the hole centers and mark with a felt tip pen 4 Drill pilot holes in the mounting surface for the mounting screws Place the amplifier in position and attach the amplifier to the mounting surface securely using screws SHOCK HAZARD Do not open the case of this product There are dangerous voltages present within the unit There are no user serviceable parts within the unit Connecting the amplifier Before doing any wiring look through this manual and identify the diagrams to follow for power input and speaker connections for your particular installation Be sure you understand all the connections before you proceed 1 Connect the power ground terminal to the closest point on the chassis of the car Keep this ground wire to less than 39 100 cm in length Use 8 gauge or heavier wire 2 Connect the remote terminal to the remote output of the head unit using 16 gauge or heavier wire 3 Connect an empty fuse holder within 18 45 cm of the car battery and run 8 gauge or heavier cable from this fuse to the amplifier location 4 Check that the fuse holder is empty Then connect the fuse h
6. f you experience operation or performance problems with this product compare your installation with the electrical wiring diagram on the previous pages If problems persist read the following troubleshooting tips which may help eliminate the problems SYMPTOM Amplifier will not power up Protection LED comes on when amplifier is powered up Low output Audio present in only one channel High hiss in the speakers Squealing noise from speakers Distorted sound Amplifier gets very hot Engine noise static type Engine noise alternator whine POSSIBLE REMEDY Check to make sure you have a good ground connection Check that the Remote Input Turn On has at least 3VDC Check that there is battery power on the terminal Check that there is at least 12v Check all fuses replace if necessary Make sure that the Protection LED is not illuminated If it is lit shut off the amplifier briefly and then repower it Check for short circuits on speaker leads Turn down the volume control on the head unit to prevent overdriving Remove speaker leads and reset the amplifier If the Protection LED still comes on then the amplifier is faulty and needs servicing Check that all fuses are OK Check that amplifier is properly grounded Check that the Remote Input Turn On has at least 3VDC Check that the RCA audio cables are plugged into the proper inputs Check all speaker wiring Reset the Leve
7. igh level inputs e LED power and protection indicators e Silver anodized heatsink e Remote subwoofer level control About 2 Ohm operation Your STEALTH amplifier has been designed to operate efficiently at loads down to 2 Ohms This means that you can install four 8 Ohm speakers per channel when using parallel wiring Increasing the number of woofers per channel at low frequencies below 100Hz produces an acoustic coupling effect This acoustic coupling effect increases your power output by about 3dB per speaker or the equivalent of an additional 10W per speaker When operating at 2 Ohms the amplifiers will increase their output power by approximately 50 The current draw will also increase by about the same amount so be sure you have enough current to run the amplifiers into a 2 Ohm load If you lack adequate current your music reproduction will be distorted STEALTH MOSFET Amplifier User s Manual page 3 General precautions Before installing and using your new Sound Storm Laboratories amplifier please become familiar with all the information contained in this manual Please keep this manual in a safe place for future reference e Do not open or attempt to repair this unit yourself Dangerous high voltages are present which may result in electric shock Refer any repairs to a qualified service technician e To avoid risk of electronic shock or damage to the amplifier do not permit any of this eq
8. igh pass filter crossover Speaker MINIMUM SPEAKER IMPEDANCE 4 OHMS High pass filter crossover Speaker Low pass filter inductor Subwoofer SPEAKER IMPEDANCE 8 OHMS STEALTH MOSFET Amplifier User s Manual page 10 Power and Speaker Wiring 4 Channel Amplifiers STA412 and STA416 SPEAKER CH3 IMPEDANCE Speaker 2 8 OHMS CH4 i Four Speaker A Channel oo Mode 5 BRIDGED MODE Sk CHI Chassis ground CH2 point Speaker R SPEAKER to REMOTE TURN ON IMPEDANCE terminal of head unit 2 8 OHMS CH1 a Sa To Speaker STEALTH MOSFET Amplifier User s Manual page 11 Power and Speaker Wiring 4 Channel Amplifiers STA412 and STA416 Connect the Negative terminal of the RIGHT subwoofer to the CH4 amplifier terminal SPEAKER PETS Connect the Postive terminal of the RIGHT subwoofer to the CH3 amplifier terminal RIGHT Subwoofer Bridged Mode BRIDGED MODE gt CH4 CH3 Ss BRIDGED MODE sae SPEAKER IMPEDANCE 4 8 OHMS Chassis ground point LEFT Subwoofer to REMOTE TURN ON terminal of head unit o Connect the Negative terminal of the LEFT FUSE subwoofer to the CH2 amplifier terminal Connect the Postive terminal of the LEFT subwoofer to the CH1 amplifier terminal STEALTH MOSFET Amplifier User s Manua
9. input level to maximum unless your input level requires it Ignoring these instructions will result in an input overload to the amplifier and excessive audio distortion It can also cause the protection circuit to engage STEALTH MOSFET Amplifier User s Manual page 5 Low Level Input Wiring Low level RCA input wiring is preferred for best audio performance Always use a high quality RCA cable for best audio performance NOTE Do not connect BOTH the high level and low level inputs from your receiver to your amplifier at the same time 2 Channel Amplifiers STA206 STA208 STA212 STA216 and STA220 Remote Subwoofer Level Control tal Lit ae 7 ELEI To Audio Outputs of head CU unit or signal as as a processor 4 Channel Amplifiers STA412 and STA416 Remote Subwoofer Level Control INPUTS a Bass Bo0si agul LB Eii Freqoeae p e wo a DS Cd ie go ia Pull Range Hive GROSSU EA 4 CHANN ay OSFET POWER AMPLIFIER i Femate Fiap A DS S l fm me Huawaarer ape PARRE Ful Rang memre Wor ce fF VEL pais hes GRO SUV ER To REAR Audio Outputs of head unit or signal processor To FRONT Audio Outputs of head unit or signal processor STEALTH MOSFET Amplifier User s Manual page 6 High Level Input Wiring The high level input s should only be used when your head unit lacks RCA outputs
10. l page 12 Power and Speaker Wiring 4 Channel Amplifiers STA412 and STA416 Tri mode operation allows you to connect this amplifier to a pair of main speakers plus a subwoofer on one pair of output channels The main speakers will operate in STEREO while the subwoofer simultaneously operates in MONO To set up the amplifier to run in this mode put the crossover switches in the FULL position Insert high pass filter capacitors and a low pass filter inductor into the wiring as shown below Be sure to check the table at the bottom of this page to determine the correct capacitor and inductor values for the crossover frequency you wish to achieve SPEAKER IMPEDANCE Tri Mode 8 OHMS mA RIGHT XK J Subwoofer Component values for 6dB Passive Crossover a oH FREQUENCY INDUCTOR CAPACITOR pea en lt uais seeaee wakes i i MINIMUM 80 Hz 7 5mMH 470uF Heid ded ki SPEAKER 100 Hz 6 5mH 330uF IMPEDANCE 120 Hz 5 5mH 330uF 150 Hz 4mH 220uF CH3 High pass Speaker filter crossover Low pass filter inductor gerne nE SF cH2 CHI Chassis ground point to REMOTE TURN ON High pass filter terminal of head unit crossover oo 0 oD Speaker Battery FUSE dedi High pass filter IMPEDANCE crossover 4 OHMS Speaker SPEAKER IMPEDANCE 8 OHMS Low pass filter inductor LEFT Subwoofer STEALTH MOSFET Amplifier User s Manual page 13 Troubleshooting I
11. l Control Check the Crossover Control settings Check the RCA interconnect cables Check all speaker wiring Disconnect all RCA inputs to the amplifiers If the hiss disappears then plug in the component driving the amplifier and unplug its inputs If the hiss disappears at this point go on until the faulty noisy component is found It is best to set the amplifier s input level control as low as possible The best subjective signal to noise ratio is achieved in this manner Try to set the head unit as high as possible without distortion and the amp input level as low as possible Check for improperly grounded RCA interconnects Check that the Input Level Control is set to match the signal level of the head unit Always try to set the Input Level as low as possible Check that all crossover frequencies are properly set Check for short circuits on the speaker leads Check that the minimum speaker impedance for the amp model is correct Check that there is good air circulation around the amp In some applications it may be necessary to add external cooling fan s This is usually caused by poor quality RCA cables which can pick up radiated noise Use only the best quality cables and route them away from power cables Check that speaker leads are not shorted to the vehicle chassis Check that the RCA grounds are not shorted to the vehicle chassis Check that the head unit is properly grounded STEALTH MOSFET Amplifier User s
12. nual page 8 Power and Speaker Wiring 2 Channel Amplifiers STA206 STA208 STA212 STA216 and STA220 Subwoofer SPEAKER IMPEDANCE Bridged 4 8 OHMS Mode BRIDGED MODE ey CE Chassis ground T point Connect the Positive terminal of the subwoofer to the R amplifier terminal Connect the Negative terminal of the subwoofer to the L amplifier terminal to REMOTE TURN ON terminal of head unit STEALTH MOSFET Amplifier User s Manual page 9 Power and Speaker Wiring 2 Channel Amplifiers STA206 STA208 STA212 STA216 and STA220 Tri mode operation allows you to connect this amplifier to a pair of main speakers plus a subwoofer on one pair of output channels The main speakers will operate in STEREO while the subwoofer simultaneously operates in MONO To set up the amplifier to run in this mode put the crossover switches in the FULL position Insert high pass filter capacitors and a low pass filter inductor into the wiring as shown below Be sure to check the table at the bottom of this page to determine the correct capacitor and inductor values for the crossover frequency you wish to achieve Component values for 6dB Passive Crossover FREQUENCY INDUCTOR CAPACITOR 80 Hz 7 5MH 470uF 100 Hz 6 5mH 330uUF 120 Hz 5 5mH 330uF 150 Hz 4mH 220uF Tri Mode to REMOTE TURN ON terminal of head unit 2 CI H
13. older to the BATT connection on the amplifier 5 If multiple amplifiers are being used in your system either e Run a separate pair of cables from the battery and a chassis ground point to each amplifier Each cable must have its own inline fuse or e Run a 4 cable from the fuse holder at the battery to a distribution block at or near the ampilifier s location Then run separate cables from the amplifier to this distribution block and to independent chassis ground points 6 Connect all line inputs and outputs if used using high quality cables Connect all speakers following the diagrams in this manual Be sure to observe proper polarity to avoid audio phase problems 7 Insert fuse s into the battery fuse holder s 8 Recheck all connections before powering up the amplifier 9 Set all level controls to minimum position and set all crossover controls switches to the desired frequency points 10 Power up the head unit and the amplifier Then set the volume control on the head unit to about 3 4 volume and adjust the amplifier s input level control s to just below the level of distortion 11 Further fine tuning of the various controls may be necessary to obtain best results Don t misuse the level control Do not mistake the input level control for a volume control It is designed ONLY to match the output level of your audio source to the input level of your amplifier Do not adjust this
14. uipment to become damp or wet from water or drinks If this does occur immediately unplug the power wires and send the amplifier to your local dealer or service center as soon as possible e f there is smoke or any peculiar odor present during use or if there is damage to any of the component enclosures immediately unplug the power wire and send the amplifier to your local dealer or service center as soon as possible Installation precautions Before you drill or cut any holes investigate your car s layout very carefully Take special care when you work near the gas tank fuel lines hydraulic lines and electrical wiring Never operate the amplifier when it is unmounted Attach all audio system components securely to prevent damage especially in an accident STEALTH MOSFET Amplifier User s Manual page 4 Before making or breaking power connections in your system disconnect the vehicle battery Confirm that your head unit or other equipment is turned off while connecting the input jacks and speaker terminals If you need to replace the power fuse replace it only with a fuse identical to that supplied with the amplifier Using a fuse of a different type or rating may result in damage to your audio system or your amplifier which is not covered by the manufacturer s warranty Mounting the amplifier 1 Find a suitable location in the vehicle in which to mount the amplifier 2 Make sure there is sufficient air
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