DOWNLOAD JBL GTO 75.4 (serv.man11) Service Manual ↓ Size: 587.77 KB | Pages: 8 in PDF or view online for FREE

Figure 13. Installing neon tubes in a JBL GTO amplifier. 

No audio 

No voltage at BATT+ 

Check voltages at

(POWER LED

or REM terminals, 

amplifier terminals

is off)

or bad or no ground 

with VOM

connection

No audio

DC voltage on 

Amplifier may need

(PROTECT LED 

amplifier output 

service; see enclosed

flashes every 

warranty card for

4 seconds) 

service information 

No audio 

Amplifier is

Make sure amplifier

(PROTECT

overheated

cooling is not blocked

LED is on)

at mounting location;
verify speaker system
impedance is within 
specified limits (see 
“Specifications” on  
the next page)

No audio

Voltage less than 9V on 

Check vehicle

(PROTECT 

BATT+ connection

charging system for

and POWER

defective voltage 

LEDs flash)

regulator

No audio

Voltage more than 16V

Check vehicle

(PROTECT 

or less than 8.5V on

charging system for

LED is on)

BATT+ connection

defective voltage 
regulator

Distorted audio

Input sensitivity is 

Check INPUT 

not set properly, or

LEVEL setting; or

amplifier or source 

check speaker wires

unit is defective

for shorts or grounds

Distorted audio

Short circuit in 

Remove speaker leads

and PROTECT 

speaker or wire

one at a time to locate

LED flashes 

shorted speaker or 
wire, then repair 

Music lacks 

Speakers are not 

Check speaker

“punch”

connected properly

connections for
proper polarity

• 1 x 204W RMS channel at 4 ohms and 

≤1% THD + N

• Signal-to-noise ratio: 77dBA (reference 1W into 4 ohms)
• 1 x 294W RMS channel at 2 ohms, 14.4V supply and 

≤1% THD + N

• Dynamic power: 320W at 2 ohms
• Effective damping factor: 6.39 at 4 ohms
• Frequency response: 10Hz – 302Hz (–3dB)
• Maximum input signal: 4.7V
• Maximum sensitivity: 220mV
• Output regulation: .098dB at 4 ohms
• Dimensions (L x W x H): 295x313x60mm 

(11-5/8" x 12-5/16" x 2-3/8")

• 1 x 424W RMS channel at 4 ohms and 

≤1% THD + N

• Signal-to-noise ratio: 72dBA (reference 1W into 4 ohms)
• 1 x 580W RMS channel at 2 ohms, 14.4V supply and 

≤1% THD + N

• Dynamic power: 778W at 2 ohms
• Effective damping factor: 6.326 at 4 ohms
• Frequency response: 10Hz – 302Hz (–3dB)
• Maximum input signal: 5.3V
• Maximum sensitivity: 210mV
• Output regulation: .21dB at 4 ohms
• Dimensions (L x W x H): 384x313x60mm

(15-1/8" x 12-5/16" x 2-3/8")

• 1 x 787W RMS channel at 4 ohms and 

≤1% THD + N

• Signal-to-noise ratio: 70dBA (reference 1W into 4 ohms)
• 1 x 1114W RMS channel at 2 ohms, 14.4V supply and 

≤1% THD + N

• Dynamic power: 1339W at 2 ohms
• Effective damping factor: 6.348 at 4 ohms
• Frequency response: 10Hz – 302Hz (–3dB)
• Maximum input signal: 6.1V
• Maximum sensitivity: 140mV
• Output regulation: .14dB at 4 ohms
• Dimensions (L x W x H): 475x313x60mm 

(18-11/16" x 12-5/16" x 2-3/8")

• 2 x 97W RMS channels at 4 ohms and 

≤1% THD + N

• Signal-to-noise ratio: 82dBA (reference 1W into 4 ohms)
• 2 x 145W RMS channels at 2 ohms, 14.4V supply and 

≤1% THD + N

• 1 x 290W RMS channel at 4 ohms, 14.4V supply and 

≤1% THD + N

• Dynamic power: 190W at 2 ohms
• Effective damping factor: 6.39 at 4 ohms
• Frequency response: 10Hz – 90kHz (–3dB)
• Maximum input signal: 5.5V
• Maximum sensitivity: 230mV
• Output regulation: .098dB at 4 ohms
• Dimensions (L x W x H): 295x313x60mm

(11-5/8" x 12-5/16" x 2-3/8")

• 4 x 104W RMS channels at 4 ohms and 

≤1% THD + N

• Signal-to-noise ratio: 80dBA (reference 1W into 4 ohms)
• 4 x 142W RMS channels at 2 ohms, 14.4V supply and 

≤1% THD + N

• 2 x 284W RMS channels at 4 ohms, 14.4V supply and 

≤1% THD + N

• Dynamic power: 163W at 2 ohms
• Effective damping factor: 6.384 at 4 ohms
• Frequency response: 10Hz – 83kHz (–3dB)
• Maximum input signal: 5.8V
• Maximum sensitivity: 230mV
• Output regulation: .069dB at 4 ohms
• Dimensions (L x W x H): 384x313x60mm

(15-1/8" x 12-5/16" x 2-3/8")

• 4 x 60W channels and 2 x 107W channels, at 4 ohms and

≤1% THD + N

• Signal-to-noise ratio: 79dBA (reference 1W into 4 ohms)
• 4 x 80W channels, 2 x 150W channels at 2 ohms, 

14.4V supply and 

≤1% THD + N

• 2 x 160W channels, 1 x 300W channel at 4 ohms, 

14.4V supply and 

≤1% THD + N

• Dynamic power: 117W (channels 1, 2, 3, 4); 

163W (channels 5, 6) into 2 ohms

• Effective damping factor: 6.392 at 4 ohms
• Frequency response: 10Hz – 47kHz (channels 1, 2, 3, 4);

10Hz – 302Hz (channels 5, 6)

• Maximum input signal: 6V
• Maximum sensitivity: 250mV
• Output regulation: .042dB at 4 ohms
• Dimensions (L x W x H): 475x313x60mm 

(18-11/16" x 12-5/16" x 2-3/8")

Declaration of Conformity

We, Harman Consumer Group International

2, route de Tours
72500 Chateau-du-Loir
France

declare in own responsibility that the product
described in this owner’s manual is in compliance
with technical standards:

EN 55013:2001
EN 55020:2002

Emmanuel Millot

Harman Consumer Group International

Chateau-du-Loir, France 10/04

JBL Consumer Products 
250 Crossways Park Drive, Woodbury, NY 11797 USA

© 2004 Harman International Industries, Incorporated

JBL and Grand Touring are registered trademarks 
of Harman International Industries, Incorporated.

Part No. GTOAMPOM10/04

www.jbl.com

• 1 x 204W RMS channel at 4 ohms and 

≤1% THD + N

• Signal-to-noise ratio: 77dBA (reference 1W into 4 ohms)
• 1 x 294W RMS channel at 2 ohms, 14.4V supply and 

≤1% THD + N

• Dynamic power: 320W at 2 ohms
• Effective damping factor: 6.39 at 4 ohms
• Frequency response: 10Hz – 302Hz (–3dB)
• Maximum input signal: 4.7V
• Maximum sensitivity: 220mV
• Output regulation: .098dB at 4 ohms
• Dimensions (L x W x H): 295x313x60mm 

(11-5/8" x 12-5/16" x 2-3/8")

• 1 x 424W RMS channel at 4 ohms and 

≤1% THD + N

• Signal-to-noise ratio: 72dBA (reference 1W into 4 ohms)
• 1 x 580W RMS channel at 2 ohms, 14.4V supply and 

≤1% THD + N

• Dynamic power: 778W at 2 ohms
• Effective damping factor: 6.326 at 4 ohms
• Frequency response: 10Hz – 302Hz (–3dB)
• Maximum input signal: 5.3V
• Maximum sensitivity: 210mV
• Output regulation: .21dB at 4 ohms
• Dimensions (L x W x H): 384x313x60mm

(15-1/8" x 12-5/16" x 2-3/8")

• 1 x 787W RMS channel at 4 ohms and 

≤1% THD + N

• Signal-to-noise ratio: 70dBA (reference 1W into 4 ohms)
• 1 x 1114W RMS channel at 2 ohms, 14.4V supply and 

≤1% THD + N

• Dynamic power: 1339W at 2 ohms
• Effective damping factor: 6.348 at 4 ohms
• Frequency response: 10Hz – 302Hz (–3dB)
• Maximum input signal: 6.1V
• Maximum sensitivity: 140mV
• Output regulation: .14dB at 4 ohms
• Dimensions (L x W x H): 475x313x60mm 

(18-11/16" x 12-5/16" x 2-3/8")

• 2 x 97W RMS channels at 4 ohms and 

≤1% THD + N

• Signal-to-noise ratio: 82dBA (reference 1W into 4 ohms)
• 2 x 145W RMS channels at 2 ohms, 14.4V supply and 

≤1% THD + N

• 1 x 290W RMS channel at 4 ohms, 14.4V supply and 

≤1% THD + N

• Dynamic power: 190W at 2 ohms
• Effective damping factor: 6.39 at 4 ohms
• Frequency response: 10Hz – 90kHz (–3dB)
• Maximum input signal: 5.5V
• Maximum sensitivity: 230mV
• Output regulation: .098dB at 4 ohms
• Dimensions (L x W x H): 295x313x60mm

(11-5/8" x 12-5/16" x 2-3/8")

• 4 x 104W RMS channels at 4 ohms and 

≤1% THD + N

• Signal-to-noise ratio: 80dBA (reference 1W into 4 ohms)
• 4 x 142W RMS channels at 2 ohms, 14.4V supply and 

≤1% THD + N

• 2 x 284W RMS channels at 4 ohms, 14.4V supply and 

≤1% THD + N

• Dynamic power: 163W at 2 ohms
• Effective damping factor: 6.384 at 4 ohms
• Frequency response: 10Hz – 83kHz (–3dB)
• Maximum input signal: 5.8V
• Maximum sensitivity: 230mV
• Output regulation: .069dB at 4 ohms
• Dimensions (L x W x H): 384x313x60mm

(15-1/8" x 12-5/16" x 2-3/8")

• 4 x 60W channels and 2 x 107W channels, at 4 ohms and

≤1% THD + N

• Signal-to-noise ratio: 79dBA (reference 1W into 4 ohms)
• 4 x 80W channels, 2 x 150W channels at 2 ohms, 

14.4V supply and 

≤1% THD + N

• 2 x 160W channels, 1 x 300W channel at 4 ohms, 

14.4V supply and 

≤1% THD + N

• Dynamic power: 117W (channels 1, 2, 3, 4); 

163W (channels 5, 6) into 2 ohms

• Effective damping factor: 6.392 at 4 ohms
• Frequency response: 10Hz – 47kHz (channels 1, 2, 3, 4);

10Hz – 302Hz (channels 5, 6)

• Maximum input signal: 6V
• Maximum sensitivity: 250mV
• Output regulation: .042dB at 4 ohms
• Dimensions (L x W x H): 475x313x60mm 

(18-11/16" x 12-5/16" x 2-3/8")

Declaration of Conformity

We, Harman Consumer Group International

2, route de Tours
72500 Chateau-du-Loir
France

declare in own responsibility that the product
described in this owner’s manual is in compliance
with technical standards:

EN 55013:2001
EN 55020:2002

Emmanuel Millot

Harman Consumer Group International

Chateau-du-Loir, France 10/04

JBL Consumer Products 
250 Crossways Park Drive, Woodbury, NY 11797 USA

© 2004 Harman International Industries, Incorporated

JBL and Grand Touring are registered trademarks 
of Harman International Industries, Incorporated.

Part No. GTOAMPOM10/04

www.jbl.com

• 1 x 204W RMS channel at 4 ohms and 

≤1% THD + N

• Signal-to-noise ratio: 77dBA (reference 1W into 4 ohms)
• 1 x 294W RMS channel at 2 ohms, 14.4V supply and 

≤1% THD + N

• Dynamic power: 320W at 2 ohms
• Effective damping factor: 6.39 at 4 ohms
• Frequency response: 10Hz – 302Hz (–3dB)
• Maximum input signal: 4.7V
• Maximum sensitivity: 220mV
• Output regulation: .098dB at 4 ohms
• Dimensions (L x W x H): 295x313x60mm 

(11-5/8" x 12-5/16" x 2-3/8")

• 1 x 424W RMS channel at 4 ohms and 

≤1% THD + N

• Signal-to-noise ratio: 72dBA (reference 1W into 4 ohms)
• 1 x 580W RMS channel at 2 ohms, 14.4V supply and 

≤1% THD + N

• Dynamic power: 778W at 2 ohms
• Effective damping factor: 6.326 at 4 ohms
• Frequency response: 10Hz – 302Hz (–3dB)
• Maximum input signal: 5.3V
• Maximum sensitivity: 210mV
• Output regulation: .21dB at 4 ohms
• Dimensions (L x W x H): 384x313x60mm

(15-1/8" x 12-5/16" x 2-3/8")

• 1 x 787W RMS channel at 4 ohms and 

≤1% THD + N

• Signal-to-noise ratio: 70dBA (reference 1W into 4 ohms)
• 1 x 1114W RMS channel at 2 ohms, 14.4V supply and 

≤1% THD + N

• Dynamic power: 1339W at 2 ohms
• Effective damping factor: 6.348 at 4 ohms
• Frequency response: 10Hz – 302Hz (–3dB)
• Maximum input signal: 6.1V
• Maximum sensitivity: 140mV
• Output regulation: .14dB at 4 ohms
• Dimensions (L x W x H): 475x313x60mm 

(18-11/16" x 12-5/16" x 2-3/8")

• 2 x 97W RMS channels at 4 ohms and 

≤1% THD + N

• Signal-to-noise ratio: 82dBA (reference 1W into 4 ohms)
• 2 x 145W RMS channels at 2 ohms, 14.4V supply and 

≤1% THD + N

• 1 x 290W RMS channel at 4 ohms, 14.4V supply and 

≤1% THD + N

• Dynamic power: 190W at 2 ohms
• Effective damping factor: 6.39 at 4 ohms
• Frequency response: 10Hz – 90kHz (–3dB)
• Maximum input signal: 5.5V
• Maximum sensitivity: 230mV
• Output regulation: .098dB at 4 ohms
• Dimensions (L x W x H): 295x313x60mm

(11-5/8" x 12-5/16" x 2-3/8")

• 4 x 104W RMS channels at 4 ohms and 

≤1% THD + N

• Signal-to-noise ratio: 80dBA (reference 1W into 4 ohms)
• 4 x 142W RMS channels at 2 ohms, 14.4V supply and 

≤1% THD + N

• 2 x 284W RMS channels at 4 ohms, 14.4V supply and 

≤1% THD + N

• Dynamic power: 163W at 2 ohms
• Effective damping factor: 6.384 at 4 ohms
• Frequency response: 10Hz – 83kHz (–3dB)
• Maximum input signal: 5.8V
• Maximum sensitivity: 230mV
• Output regulation: .069dB at 4 ohms
• Dimensions (L x W x H): 384x313x60mm

(15-1/8" x 12-5/16" x 2-3/8")

• 4 x 60W channels and 2 x 107W channels, at 4 ohms and

≤1% THD + N

• Signal-to-noise ratio: 79dBA (reference 1W into 4 ohms)
• 4 x 80W channels, 2 x 150W channels at 2 ohms, 

14.4V supply and 

≤1% THD + N

• 2 x 160W channels, 1 x 300W channel at 4 ohms, 

14.4V supply and 

≤1% THD + N

• Dynamic power: 117W (channels 1, 2, 3, 4); 

163W (channels 5, 6) into 2 ohms

• Effective damping factor: 6.392 at 4 ohms
• Frequency response: 10Hz – 47kHz (channels 1, 2, 3, 4);

10Hz – 302Hz (channels 5, 6)

• Maximum input signal: 6V
• Maximum sensitivity: 250mV
• Output regulation: .042dB at 4 ohms
• Dimensions (L x W x H): 475x313x60mm 

(18-11/16" x 12-5/16" x 2-3/8")

Declaration of Conformity

We, Harman Consumer Group International

2, route de Tours
72500 Chateau-du-Loir
France

declare in own responsibility that the product
described in this owner’s manual is in compliance
with technical standards:

EN 55013:2001
EN 55020:2002

Emmanuel Millot

Harman Consumer Group International

Chateau-du-Loir, France 10/04

JBL Consumer Products 
250 Crossways Park Drive, Woodbury, NY 11797 USA

© 2004 Harman International Industries, Incorporated

JBL and Grand Touring are registered trademarks 
of Harman International Industries, Incorporated.

Part No. GTOAMPOM10/04

www.jbl.com