background image

3

QM75.4

 

WIRING & CONNECTIONS

 It is important to read this manual thoroughly before starting your installation and always plan accordingly. 

Before installing, disconnect the negative (ground) wire from the vehicle’s battery to avoid damage to the 

vehicle or yourself. Following all guidelines will help provide years of enjoyment with your STEG amplifier.

Power Supply Terminal

Œ

Ground (GND): 

 The ground terminal must be connected to a metal part of the vehicle with ground 

Ÿ

plane back to the main battery ground attachment point (a.k.a. chassis ground). This wire should be as 

short as possible, but no longer than 2ft (60cm), with minimum gauge of 8AWG. The ground wire 

should be terminated with a ground specific or ring terminal and securely bolted to the vehicle with 

star or lock washer and nut to prevent from coming loose. The chassis ground connection point 

should be scuffed to the bare metal.

Remote Turn-on (REM):

  A sw12V lead must be connected to the REM terminal to turn on the 

Ÿ

amplifer, such as the source unit's remote output or vehicle switched ignition wire. 

Ÿ

Power (+12V): 

 The co12V power connection must be made at the vehicle main battery, 

securely connected with a ring terminal and protected with an in-line fuse within 18in (45cm) from the 

positive battery terminal. The QM75.4 and QM500.1 require a 60A fuse (not included) and a minimum 

power wire gauge of 8AWG. Do not install the fuse until all other system connections have been made.

Fuses:

 These ATC fuses are to protect the amplifier and must be inserted for operation. When replacing 



fuses, check for system wiring faults and always use the specified value for each fuse (30A).  

Power/Protect LEDs (POW/PRO): 

These LEDs indicate the amplifer status. Green indicates the amplifier 

Ž

is on and in normal operation. Red indicates the amplifier is in protection mode, due to overheating, 

under-voltage or output short circuit condition.

Speaker Output Terminal



Ÿ

Speaker Outputs:

  Each (+) and (-) terminal pair per channel is for connecting the amplifier's output to 

speaker(s) or subwoofer(s). Make sure to observe correct polarity and total impedance per channel. For 

the QM75.4 model, the minimum nominal impedance is 2

Ω

 per channel, or 4

Ω

 for bridged 

connections. For the QM500.1, the minimum total nominal impedance is 1

Ω

.

RCA Inputs (LINE IN):

  The RCA input jacks are for left and right channel signals from the source. Use 



quality interconnects to ensure stable connection and minimize the possibility for induced noise. 

Speaker Level Inputs (HIGH LEVEL):

  These inputs are for wired connection to a speaker level source, 

not to exceed 12Vrms. Make sure to observe correct polarity. For signals containing DC-offset, the 

amplifier will automatically turn on without requiring a sw12V connection at the REM terminal. 

Remote Level Controller (REMOTE):

 This jack is available on the QM500.1 model only and is for 

connecting the included remote level controller to the amplifier

Bridged Connection and Switch:

 This single RCA jack is for connecting two QM500.1 mono amplifiers 

together in a bridged configuration to provide double power for subwoofer(s) with a minimum total 

nominal impedance of 2

Ω

. Set the switch to  "MASTER" on the amplifier connected to the source, and set 

the other amplifier's switch to "SLAVE" to receive the bridged signal.    

Œ





Ž





Ž

Œ

<2ft 

(60cm)

Remote

Turn-on

12V

Chassis 

Ground

<18in 

(45cm)

8AWG

(min)

12V

Remote

Turn-on

12V

Chassis 

Ground

<18in 

(45cm)

8AWG

(min)

12V

QM500.1

y

y

y

<2ft 
(60cm)

Summary of Contents for QM75.4

Page 1: ...Car Audio Power Ampli ers USER S GUIDE QM75 4 QM500 1...

Page 2: ...Speaker Wire In line Fuse Holder w Fuse Battery Ring Terminal Chassis Ground Terminal Wire Crimp Connectors Grommets and Loom Cable Ties Mounting Screws Remote Level Controller Terminal s QM500 1 onl...

Page 3: ...me Note All speci cations are subject to change without notice QM75 4 QM500 1 4 14 4V 75W x 4 200W x 1 2 14 4V 105W x 4 350W x 1 4 BTL 14 4V 210W x 2 1 14 4V 500W x 1 FrequencyResponse 0 3dB 1W 4 10Hz...

Page 4: ...e speci ed value for each fuse 30A Power Protect LEDs POW PRO These LEDs indicate the amplifer status Green indicates the ampli er is on and in normal operation Red indicates the ampli er is in protec...

Page 5: ...nnel Stereo Bridged 2 Channel Bridged QM75 4 Speaker Connection Examples Bridged Con guration Example 2 min 2 min 2 min 2 min 2 min 2 min 4 min 4 min 4 min QM500 1 Subwoofer Connection Examples 1 min...

Page 6: ...5 4 model and sets the HPF cut o frequency Fc from 15Hz to 3 5kHz with a slope of 12dB oct For smaller full range or component speakers use the high pass HPF setting to lter out unwanted lower frequen...

Page 7: ...no defect is found the item will be returned to dealer Items misused altered or neglected are not covered W vtech will not be liable for any loss cost of repair or any other damage of any kind connect...

Page 8: ...ed is subject to change The described in this User s Guide represent just a part of the STEG products available All brands and trademarks mentioned have been used exclusively for description purposes...

Reviews: