User manual JBL GTS50

[. . . ] In addition to conventional preamplevel inputs, this model features JBL's Universal Interface design, which facilitates simple connection to factory radios with the low distortion that is usually only associated with preamp level connection. With Universal Interface, a factory radio can be used either as the main music source or combined with a CD player or changer, which includes volume control capability, simultaneously connected to the amplifier. By providing this two-unit direct connection, Universal Interface circuitry eliminates the need for an FM modulator to interface a CD player to factory radios, improving the fidelity of digital playback. In addition, when using a highpowered (BTL) radio through the speaker-level inputs, Common Sense turn-on circuitry senses the common-mode voltage present on the radio's speaker wires, turning the amplifier on without an additional "remote" wire. [. . . ] See "Wiring" directions for information on proper connections. 9. Fuse ­ 40 Amp ATC type fuse for the GTS300 and two 40 amp fuses for the GTS50. Gain Control ­ Use this control to adjust the input sensitivity of the amplifier. See the "Adjusting the Gain" section for tips on proper setup. Preamp-Output Crossover Switch ­ This switch controls the built-in crossover that is directed to the preamp-output connectors. Set the switch to "Flat" for full band operation. Set this switch to "Low-Pass" to activate the lowpass filter on the preamp output (for subwoofer use). Set the switch to "High-Pass" to activate the high-pass filter for use with satellite speakers. Speaker Output Crossover Switch ­ This switch controls the built-in crossover that is connected to the power amplifier circuitry. Set the switch to "Flat" for full band operation. Set this switch to "Low Pass" to activate the low pass filter on the amplifier (for subwoofer use). Soldering crimp connections is recommended to further enhance connection reliability. Never use wire-nuts, insulation-displacement connectors (i. e. ScotchLok type), or "twist and tape" connections. Do not use electrical tape; it will loosen with age and extreme temperatures. Route the wiring through the car carefully. Do not allow wires to lay against sharp sheet metal edges or any other surfaces that might wear away or cut through the insulation of the wire. Use insulated strain reliefs, rubber grommets and plastic tubing to protect the wires whenever they are run through sheet metal panels or are placed where they might be pulled or damaged. Cassette/CD Tuner Speaker Level Output Connection (Use only when line level ouput is not available) Cassette/CD Tuner CD Player or Changer Antenna Input Power Antenna Cassette/Receiver Power Supply Wires CD Input Fuse Fuse Black - Power Ground Remote Antenna Blue (Blue/White) Remote On/Off Yellow - Back Up Power Red - Main +12V Antenna Motor Power Supply POWER Power Antenna Relay Cassette/CD Preamp Output Amplifier Power Connection MA DE IN THE US A Amplifier Speaker Level Input Line Input Amplifier Speaker Output Connection Speakers + ­ Blue w/White Stripe - Remote On/Off Ignition Switch GTS300 ­ 40 Amp GTS50 ­ 80 Amp (Not Included) Fuse Main +12V + ­ + Vehicle Battery Power Ground Chassis Ground 5 5. Internal Adjustments Speaker-Level Input Impedance Adjustments The speaker level inputs of the GTS300 and GTS50 come factory set with 100K ohm input impedance. This will provide the lowest distortion operation from the speaker outputs of most modern head units by reducing the power the amplifier in the head unit must deliver to practically nothing. On some older, or lowerpriced head units, this load will not facilitate proper fader operation. To provide for this, we have provided the ability to change the input impedance of the speakerlevel inputs to 15 ohms. [. . . ] Reduce the level just to the point where the distortion goes away. If this setting does not provide adequate volume levels, gradually increase (turn clockwise) the gain control on the GTS300 ot GTS50 8 MA DE IN THE US A M M GOOD-Horizontal Mounting AIR FLOW NEVER-Mount Upside Down E AD IN E AD IN TH E TH E 7. Typical Applications The following diagrams show the most common basic system configurations of the GTS300 and GTS50. A combination of one or more of these "building blocks" may be combined to form elaborate system designs. 9 Application 1 Application 1 Stereo Full-Range or Subwoofer Operation Stereo Full-Range or Subwoofer Operation Preamp or L Speaker-Level R Input Full-Range Operation Speaker Output Crossover Switch Flat Input Mode Switch Stereo DE MA I N THE USA Subwoofer Operation Speaker Output Crossover Switch Low Pass GTS300/600 Input Mode Switch Stereo L­ L+ ­ + ­ R­ R+ + Speakers or Subwoofers 2 or 4-Ohm Full-Range Main speakers are driven by head unit or additional amplifier. Application Application 2 2 Bridge-Mode Bridge-Mode Operation Operation L Single Amplifier: Subwoofer-Operation (Mono) Amp B Speaker Output Crossover Switch Low Pass Input Mode Switch L+R Preamp or Speaker Level R For Dual-Amplifier Full-Range or Subwoofer Use For Single Amplifier Subwoofer Use Main speakers are driven by head unit or additional amplifier. R L R Dual Amplifier: Subwoofer-Operation (Stereo) Amp A+B Speaker Output Crossover Switch Low Pass Speaker Output Crossover Switch Flat Input Mode Switch R GTS300/600 DE MA DE MA I N THE I N THE USA USA GTS300/600 A 4-Ohm Full-Range Speaker or Subwoofer B L­ R+ ­ + 4-Ohm Full-Range Speaker or Subwoofer Full-Range Operation (Stereo) Amp A+B Input Mode Switch R L­ R+ ­ + Application 3 Application 3 Bi-amplified, Three-channel Bi-amplified, Three-channel Subwoofer/Satellite Subwoofer/Satellite System System. Amp Speaker Output Crossover Switch High Pass Low Pass Front Rear L Input Mode Switch Stereo L+R DE MA R Preamp or Speaker-Level Input L R A B DE MA I N THE I N THE USA USA GTS300/600 GTS300/600 Stereo Subwoofers may be used by configuring Amp B as shown in Application #1. A L­ R+ L­ R+ 2 or 4-Ohm Full-Range Speakers B L­ R+ 4-Ohm Subwoofer ­ + ­ + ­ + 10 Application 4 Application 4 Bi-amplified System Bi-amplified, System Using Using Preamp Output Preamp Output Capability Capability. Amp Speaker Output Crossover Switch Input Mode Switch Preamp or Speaker-Level Input Preamp Preamp L Preamp Output Crossover R Output R L L R Intput DE MA DE MA A B High Pass Low Pass Stereo L+R Flat Doesn't Matter I N THE I N THE USA USA GTS300/600 GTS300/600 Stereo Subwoofers may be used by configuring Amp B as shown in Application #1 or by using dual GTS amplifiers as shown in Application 2. A L­ L+ B R­ R+ L­ R+ 4-Ohm Subwoofer ­ 2 or 4-Ohm Full-Range Speakers + ­ + ­ + Simultaneous Stereo-Mono Connection Diagrams A. [. . . ]