+ USERS MANUAL
User manual purpose This user manual is dedicated to the use of the bass amplifier GR 300+. The manual includes the following information: General information (technical data and packaging); Description of the amplifier’s functions. All the informations described on this user manual are verified. The manufacturer reserves the right to update or modify their product without any notice. PACKAGING AND STORAGE Packaging GR 300+ is packed in a special cardboard box.
Product disposal Please follow the disposal instruction issued by your local council. In accordance with European Directive 2002/96 / EC, all electrical and electronic products should be disposed by specific collection facilities appointed by the government or the local authorities.
Dati tecnici MAIN FEATURES • 2 Speakon/jack output • XLR DI Out • Tuner Output • Headphone output • Send return • Aux in • 9V DC output, 250mA • Gain • Bass, middle and treble • Middle frequencies switch • Subsonic filter • DI/Headphone volume • Led VU Meter • Protection circuits to avoid overheating and Electric power overload DI and Headphones output and tuner out are always active even if no speaker is plugged into the speakon outputs.
CONTROLS DESCRIPTION FRONT PANEL CONTROLS 1. Input Jack Input jack for your bass. We suggest to use a good quality cable to obtain the best audio performances. 2. -10 dB Button On “-10dB” position, the button attenuates the input signal to the preamp (use only with active PU or high input signal instrument). 3. Aux IN 3.5mm jack Auxiliar input to connect an external audio device 4. GAIN control knob To adjust the input signal amount of the pre-amp. 5.
7. Mid knob To increase or reduce the mid range frequencies. 8. High knob To increase or reduce the high frequencies. 9. SUBS Filter button Subsonic filter switcher for the woofer protection. The subsonic filter eliminates the frequencies under 22Hz. It does not modify the audio signal and reduces the woofer range. 10. DI-HEAR KNOB DI and headphones volume. The headphones volume is amplified compared to the DI.
REAR PANEL CONTROLS 1. Power plug IEC (230V - 115V IEC plug for power supply connection The GR300+ can be powered with a voltage of 230V or 115V. The supplied cable is equipped with a ground wire. For safety and security reasons, never unplug the ground wire from your equipments. 2. Power switch To switch on and off your amplifier. 3. 9V output 9V DC output to connect external equipment (we recommend to connect 4-5 pedal effect maximum). The polarity is center positive. 4. Tuner-out 6.
6. Send 6.35mm jack plug to connect an external effect’s input 7. DI output XLR plug 8. Speakon outputs It is possible to use a 6.35 mm jack. We recommend to use a 2 poles speakon connector Never use a 6.35 jack guitar cable to connect your amplifier to your speakers. 9. FAN switch FAN cooler on and off switch We recommend to switch off the FAN only at home or in a recording studio. The failure of the fan’s activation ONLY determines the heating of the GR300+ case, which is actually a heat sink.
11. Dot-Bar button Allows to choose the front VU-METER display mode between “dot-mode” and “bar-mode”. GND Lift The DI out is very accurate and noiseless so there will hardly never need to deactivate the GND LIFT. If you like it you can do so by opening the lid and removing its jumper.
WARRANTY CONDITION The warranty covers a period of two years. The warranty covers any defects in material or workmanship under normal use during the warranty period. Any shipping cost to/from the repair service centre is the customer’s responsibility. In the event of an irreparable damage or repeated failure of the same type, the manufacturer may replace the unit, within the term of the original warranty.
Note 11
via Nino Bixio 182 70043 Monopoli (Ba) > tel.: 347 6322 657 info@grbass.com > www.grbass.com > P.
