IMPORTANT PRECAUTIONS

0 0 8 80 db 6 0 5 PROT CLIP 5dB 0dB SIG BRG PAR ON 0 0 8 GRAVIS CH db 6 0 5 Professional Power Amplifier User's Manual English GRAVIS SERIES

CONTENTS Important precautions... GRAVIS series front panel and function description... GRAVIS series rear panel and function description... GRAVIS series connections set up...5 Protection circuits...7 Exfactory settings...7 Use environment...7 Applications...7 Block diagram...8 Specifications...9 GRAVIS series dimensions...0

IMPORTANT PRECAUTIONS.Read all documentation before operating your equipment..retain all documentation for further reference..mains voltage must correspond to rear unit label..damages caused by connecting to improper AC voltage are not covered by any warranty. 5.Always operate the unit with the AC ground wire connected to the electrical system ground. Precautions should be taken to avoid equipment faulty, improper or inefficient grounding. 6.After connection to power supply Standby LED is lit, showing that some components inside are already powered. 7.Do not connect any amplifier channel output into another channel input. Do not connect in parallel or series an amplifier output with any other amplifier output. 8.In system setup, amplifier's output power should be 50% greater than loudspeaker(s) rated handling power. 9.Make sure the signal is correctly connected to amplifier input channel following current input mode. 0.Please turn off the power switch when extracting the power cord and signal cable, or adjusting the input mode switch..in order to split one signal to more than one amplifier, we suggest to use a signal distributor..in typical use, please set the volume to 0dB position..if you need to supply power to more than one unit power amplifiers,to eliminate the big surge current interference to electricity net, and preventing the voltage fluctuate abnormal when simultaneously switching on the amplifiers, we recommend you use the sequence power procedure..do not obstruct the air entrance and exit ports.

Important: Control functions and adjustment functions not described in this user's manual may cause mechanical danger or electrical shock. GRAVIS series front panel function description: ON 6 GRAVIS 6 6 8 5 PROT CLIP 5dB 0dB SIG BRG PAR ON 8 5 0 0 0 OFF 80 0 db 80 0 db CH. Installation socket To be used to fix in 9" rack installation.. Air entrance This is the air entrance, don't block it. Since the dust will settle in the grille, please regularly remove the screws to clean the filter under the grille, thus maintaining a good ventilation.. 5dB signal indicator LED When signal is at 5dB, this orange LED will be lit.. CLIP indicator When this indicator is on, it means the amplifier has distortion (CLIP). In this status, the distortion is around 0.5%. 5. Protection Indicator When this indicator is lit, it means the amplifier is in protection status, which should be due to output shortcircuit, overheat,dc, VHF (constant nonmusical high frequency signal due to selfexcitation or long time highfrequencies feedback). 6. 0 db signal indicator LED This green LED will be lit when signal at 0dB. 7. Signal indicator With signal is up to db, the green indicator LED will be lit. This LED is on with an input level around 0.5V. 8. Power ON Indicator When this indicator is on, it means the main power supply system of amplifier is working. 9. volume control In stereo or parallel mode: this knob controls volume. In bridge mode, this knob controls both channels volume, while CH knob is disabled. Gain control range: 80dB~0dB in 0 steps, available turning angle is 80 degree. 0.Bridge indicator When this indicator is lit the amplifier is on bridge mode, as set by rear panel dip switches..parallel indicator When this indicator is lit the amplifier is on parallel mode, as set by rear panel dip switches..ch volume control In stereo or parallel mode, this knob controls CH volume. In bridge mode, this knob is inactive, the amplifier volume is controlled by knob only. Gain control range: 80dB~0dB in 0 steps, available turning angle is 80 degree..power Switch This switch is used to turn power on and off. Press the upper part to switch ON, and lower part to switch OFF.

CAUTION RISK OF ELECTRIC SHOCK DO NOT OPEN ATTENTION:RISQUE DE CHOC ELECTRIQUE NE PAS OUVRIR WARNING:TO REDUCE THE RISK OF FIRE OR ELECTRIC SHOCK DO NOT EXPOSE THIS EQUIPMENT TO RAIN OR MOISTURE GRAVIS series rear panel function description: LINK INPUT OUTPUT! INPUT SENSITIVITY F U S E TAL 50V CAUTION: REPLACE ONLY WITH SAME TYPE FUSE! CH db.0v 0.775V OPERATION MODE PARALLEL BRIDGE STEREO ~0V/50Hz/500W CH ON OFF SOFT CLIPPING CH LINK CH INPUT Made in China under license of MONTARBO ELETTRONICA S.r.l ITALY CH OUTPUT F U S E. Fuse holder(0v) This fuse holder contains a standard fuse, which is used to protect amplifier from damages. If the amplifier is connected to power supply but Power ON LED is not lit, please check the fuse status. If you found the fuse broken, you must replace it with a same specification fuse.. Air exit This part is the air exit. Don't obstruct it.. Input sensitivity selection by dip switches, with three settings: Whole system signal gain db switches () ON; CH switches () ON. Whole system signal gain.0v switch ON, switch OFF; CH switch ON, switch OFF. Whole system signal gain 0.775V switches () OFF; CH switches () OFF.. LINK socket LINK socket is a male XLR in parallel connection with female XLR, providing an output signal similar to the input. 5. XLR input This XLR input is a balanced input, to be connected to sound source equipment. 6. Binding post output Connect red color binding post to the positive pole of speaker. Connect black color binding post to the negative pole of speaker. In bridge mode, connect red color binding post to speaker positive connector. 7. SPEAKON output There are two ways to use this Speakon output connector: ) In Stereo or Parallel modes: connects the positive pole; connects the negative pole. ) In Bridge mode: connects to positive pole, connects to negative pole. 8. Power cord This is the mains cord. Before plugging it to a AC power supply, please kindly check whether the amplifier marked voltage is conform to local voltage or not. Then connect the power cord to a mains plug conform to local mains socket.

CAUTION RISK OF ELECTRIC SHOCK DO NOT OPEN ATTENTION:RISQUE DE CHOC ELECTRIQUE NE PAS OUVRIR WARNING:TO REDUCE THE RISK OF FIRE OR ELECTRIC SHOCK DO NOT EXPOSE THIS EQUIPMENT TO RAIN OR MOISTURE GRAVIS series rear panel function description: 9. Operation mode selector by dip switches allows three settings: )Stereo mode: dip switches and are OFFOFF and CH have independent inputs and outputs. Two channels volume are independently controlled. )Parallel mode: dip switch is OFF, and is ON and CH use input signal. Two channels volume are independently controlled. )Bridge mode: dip switches and are ON and CH use input signal. The volume will be controlled by knob only. 0. Soft clip selector/ DIP Switches ) With dip switch is ON and input signal overloads, the circuit will smoothly limit the waveform. ) With dip switch is ON and CH input signal overloads, the circuit will smoothly limit the waveform.. CH LINK socket CH LINK socket is male XLR in parallel connection with CH female XLR, providing an output signal similar to the input.. CH XLR input This XLR input is a balanced input, to be connected to sound source equipment.. CH Binding post output Connect red color binding post to the positive pole of speaker. Connect black color binding post to the negative pole of speaker. In bridge mode, connect red color binding post to speaker negative connector.. CH SPEAKON output In Stereo or Parallel modes connect the SPEAKON output to the loudspeaker as follows: to the positive pole, to the negative pole.setting the amplifier to bridge mode, this connection is no longer active. Stereo mode/parallel mode/ bridge mode.stereo mode STEREO (OUT) (IN) OR LINK INPUT OUTPUT! INPUT SENSITIVITY F U S E TAL 50V CAUTION: REPLACE ONLY WITH SAME TYPE FUSE! CH db.0v 0.775V OPERATION MODE PARALLEL BRIDGE STEREO ~0V/50Hz/500W CH ON OFF SOFT CLIPPING CH LINK CH INPUT Made in China under license of MONTARBO ELETTRONICA S.r.l ITALY CH OUTPUT (OUT) Connection procedure for this mode: ) Using rear panel dip switches, set the mode to 'STEREO'; ) and CH inputs are independently connected to /CH (L/R) outputs of sound source (such as a mixer, CD player, etc.). ) There are two ways for output connection: A. SPEAKON(/)= (/)OUTPUT, CH SPEAKON = (/) = CH(/)OUTPUT; B. Binding post outputs. Attention: Before plugging the input signal connectors please turn the volume to the minimum to avoid any noise, which should damage the connected speakers. 5 (IN) OR

CAUTION RISK OF ELECTRIC SHOCK DO NOT OPEN ATTENTION:RISQUE DE CHOC ELECTRIQUE NE PAS OUVRIR WARNING:TO REDUCE THE RISK OF FIRE OR ELECTRIC SHOCK DO NOT EXPOSE THIS EQUIPMENT TO RAIN OR MOISTURE CAUTION RISK OF ELECTRIC SHOCK DO NOT OPEN ATTENTION:RISQUE DE CHOC ELECTRIQUE NE PAS OUVRIR WARNING:TO REDUCE THE RISK OF FIRE OR ELECTRIC SHOCK DO NOT EXPOSE THIS EQUIPMENT TO RAIN OR MOISTURE ~0V/50Hz/500W Stereo mode/parallel mode/ bridge mode.parallel mode (OUT) (IN) OR PARALLEL LINK INPUT OUTPUT! INPUT SENSITIVITY F U S E TAL 50V CAUTION: REPLACE ONLY WITH SAME TYPE FUSE! CH db.0v 0.775V OPERATION MODE PARALLEL BRIDGE STEREO ~0V/50Hz/500W CH ON OFF SOFT CLIPPING CH LINK CH INPUT Made in China under license of MONTARBO ELETTRONICA S.r.l ITALY CH OUTPUT Setting amplifier's working mode to the "PARALLEL", channel input only is linked to the output of sound source (such as a mixer, a CD player, etc.), and feeds both amplifier channels. Anyway, both channels volume controls are independent, so you can adjust each volume control as desired. Connection procedure for this mode: ) Using rear panel dip switches, set the amp mode to 'PARALLEL' position. ) Connect input to the output of sound source (such as a mixer, a CD player, etc.); CH input is not connected. ) There are two ways for output connection: A. SPEAKON(/)=(/)OUTPUT, CH SPEAKON=(/)=CH(/)OUTPUT; B. Binding post outputs. Plugging the input signal connector, please turn the volume knobs to the minimum to avoid any noise, which should damage the connected speakers..bridge mode (OUT) (IN) OR OR BRIDGE LINK INPUT OUTPUT! INPUT SENSITIVITY F U S E TAL 50V CAUTION: REPLACE ONLY WITH SAME TYPE FUSE! CH db.0v 0.775V OPERATION MODE PARALLEL BRIDGE STEREO CH ON OFF SOFT CLIPPING CH LINK CH INPUT Made in China under license of MONTARBO ELETTRONICA S.r.l ITALY CH OUTPUT Connection procedure for this mode: ) Using rear panel dip switches, set the amplifier mode to 'BRIDGE' position. ) Connect input to the output of sound source (such as a mixer, a CD player, etc.). With this mode, CH input is not connected, and CH volume control is inactive. 6

Protection circuits. CLIP/Limit This feature has two protection functions: ) Limiting the input signal level to prevent input signal overloading beyond amplifier rated input level, thus causing square wave output damaging the speaker. ) When the signal waveform distorts, it can automatically adjust gain and limit distorted signal output. Note: If input signal is dbu (0V) even clip limit will be helpless, so do not increase input source signal unlimitedly.. Soft clip This function can be selected by rear panel ON/OFF dip switches. When the input signal exceeds the set range, it will smoothly limit the input waveform range.. Overheat protection ) When the amplifier works at full load for a long time, fans could reach higher speed. If this condition continues and the amplifier transistor temperature rises to 95 degrees, the firststep power decrease (halving output power) will be activated, to ensure that even overheating still there's program output. Power reduction according to different music content, amplifier will be recovered to be original output power in 0 minutes. ) When the amplifier works for long time in overload, without ventilation or external temperature higher than 5 degrees,the amplifier is in the first phase of power reduction and no eased, the amplifier transistor temperature rises to 05 degrees, the fully protection will be activated and no signal will be output. In this condition, the PROT (protection) LED and temperature LED are simultaneously on. Suggestion: Do not connect to the amplifier loads under ohms, don't place the amplifier in hightemperature environment and without air flow.. VHF protection If the amplifier output has reached a certain level and large amount of frequencies exceeding 0KHz, like a mic feedback, then the amplifier may go into VHF protection after seconds. In this case the PROT (protection) LED on the front panel will be lit, the amplifier will have no output, but it will be recovered automatically after 0 seconds protection circuit activation. If the output signal does not change, the VHF protection will continue to be active. 5. Shortcircuit protection All our company Gravis series amplifiers are provided of shortcircuit protection. This protection makes the output transistors working in a safe range. When output is in shortcircuit, the PROT (protection) LED on the front panel will be lit and the amplifier has no output. The amplifier will be recovered 0 seconds after the end of shortcircuit removal. 6. AC Power Supply Protection If the AC mains voltage is lower than the minimum allowed working voltage (~65V), the power supply will be automatically turned off until when the mains voltage returns in regular range. 7. DC protection ) In order to protect the speaker, the DC protection circuit will be activated, when the output signal has large DC voltage (=.6V). In this case the PROT (protection) LED on the front panel will be lit, and the amplifier will have no output. ) If there is DC output and the relay circuit is open, there's a protection circuit to force the amplifier output to burn the fuse to protect the speakers. Exfactory settings. All the volume adjustment knobs were set at "80dB" position.. Power switch was set "OFF".. Soft clip dip switches set "ON".. Working mode selector dip switches set at "STEREO" place. 5. Sensitivity selector dip switches set at "0.775V" place. Use environment. The room temperature shall be kept around 5 degree when used indoor. The amplifier can't be used at too high temperature environment or such temperature may cause components damages due to overheat.. If used outdoor, please avoid sunshine and rain damped, or it would shorten equipment's life.. a. Environment temperature: 0 C~0 C b. Relative humidity: less than 90% c. Air pressure: 80kPa~06kPa Applications Gravis series has been designed for live concert, disco, night club, etc. 7

Block diagram db/.0v/0.775v db/.0v/0.775v db/.0v/0.775v 8

Specifications ITEM MODEL GRAVIS GRAVIS 0 GRAVIS 6 GRAVIS 6 8Ω stereo power* 50Wx 650Wx 850Wx 00Wx Ω stereo power* 750Wx 00Wx 00Wx 000Wx Ω stereo power** 50Wx 00Wx 00Wx 000Wx 8Ω bridge power* Ω bridge power** Frequency response THDN(THD%) Slew rate Damping factor (@00Hz) Dynamic range 600W 80W 000W 00W 550W 00W 600W 6500W 0V/us 0Hz0KHz@8 Ω,(/0.5dB) <0.% <0.% <0.% <0.% 0V/us 0V/us 0V/us >00 >00 >00 >00 80dB 80dB 80dB 80dB S/N rate 90dB 90dB 90dB 90dB Input Sensitivity Voltage gain Input Impedance Output circuit class Protection Cooling airflow Power voltage frequency Gross weight db/.0v/0.775v db/.0v/0.775v db/.0v/0.775v db/.0v/0.775v 8dB 8dB 8dB 8dB Bal 0K/Unbal 0K Class H Class H Class H Class H Soft start, short circuit, overload, DC, overheat, THD clip/limit, output volume increase gradually function after switch on, lack of voltage of SMPS, VHF, infrasound frequency protection, overpower limit, output power will be limited if overheat Airflow from front panel to rear panel. ~0V±0%/5060Hz Kg Kg 5Kg 6Kg Power has been tested under EIAJ standard @ 0V. 9

CAUTION RISK OF ELECTRIC SHOCK DO NOT OPEN ATTENTION:RISQUE DE CHOC ELECTRIQUE NE PAS OUVRIR WARNING:TO REDUCE THE RISK OF FIRE OR ELECTRIC SHOCK DO NOT EXPOSE THIS EQUIPMENT TO RAIN OR MOISTURE F U E GRAVIS series dimensions: Front panel 89mm 8 0 6 GRAVIS 6 5 8 PROT CLIP 5dB 0dB SIG BRG PAR ON 0 6 5 ON OFF 80 0 db 80 0 db CH 8mm Rear panel LINK INPUT OUTPUT! INPUT SENSITIVITY 89mm S TAL 50V CAUTION: REPLACE ONLY WITH SAME TYPE FUSE! CH db.0v 0.775V OPERATION MODE PARALLEL BRIDGE STEREO ~0V/50Hz/500W CH ON OFF SOFT CLIPPING CH LINK CH INPUT Made in China under license of MONTARBO ELETTRONICA S.r.l ITALY CH OUTPUT 0mm Side panel 76mm GRAVIS /GRAVIS 0:55mm GRAVIS 6/GRAVIS 6:6mm 8mm 0