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USERS MANUAL
ONE 350
ONE 800
ONE 1400
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USER MANUAL PURPOSE
This user manual is dedicated to the use of the bass amplifiers GR-ONE 800, GR-ONE700x2 and GR-ONE 350.
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
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PACKAGING AND STORAGE
PACKAGING
GR-ONE 800, GR-ONE700x2 and GR-ONE 350 are packed in a special cardboard box. The box contains the
amplifier, power supply cable and the user manual.
TRASPORT
Please handle the box with care. A specific position during the transport is not required.
STORAGE
Please keep the amplifier in a dry and ventilated place.
Ideal storage conditions: Temperature within -20C and
40C, Humidity 20% to 80%.
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.
DECLARATION OF CONFORMITY
The product complies with the following European directive:
2014/35 / EU - Electrical Safety
2014/30 / EU - Electromagnetic Compatibility
2011/65 / EU - Limited use of certain hazardous substances in electrical and electronic equipment
A full copy of the declaration of conformity is available
from the manufacturer.
The manufacturer is not responsible of any damage due
to an improper use of the product.
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MAIN FEATURES
• 2 SPEAKON Indipendent audio output (ONE 700x2), 1
SPEAKON audio output (ONE 800 and ONE 350)
• XLR DI out
• Headphone Output
• Tuner Output
• Send-Return
• Aux-In
• Output 9V, 250 mA
• Gain control
• Bass, Mid-Low, Mid-High and High equalization control
• Mid-Low frequencies switch
• Mid-High frequencies switch
• Deep setting
• Brigth setting
• Pure setting
• Mute setting
• DI volume
• Anti-bump on DI out
• Headphone volume
• Master Volume control (ONE 350 and ONE 800);
• Master volume channel1 and Master volume channel
2 (ONE 700x2)
• Vu-Meter
• Chromatic tuner
• “Studio” and “Live” fan mode operation
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TECHNICAL FEATURES ONE 350
• POWER RMS 350 W @ 4Ω
• DYNAMIC RANGE: 113dBA
• Parameters of nominal distortion output:
a) TDH+N: - 0.005 % @ 1 W (4Ω, 1 kHz), 0.0008 % @
50W (4Ω, 100 Hz)
b) CCIF IM distortion = 0.0003 %, 10 W, 4Ω, 18.5 kHz /
1 kHz
• Low output impedence: 6mW
• Total Efficiency: 80 % @ 350 W, 4Ω
TECHNICAL FEATURES ONE 800
• POWER RMS 800 W @ 4Ω
• DYNAMIC RANGE: 117dBA
• Parameters of nominal distortion output:
a) TDH+N: - 0.005 % @ 1 W (4Ω, 1 kHz), 0.0008 % @ 50
W (4Ω, 100 Hz)
• Low output impedence: 6mW
• Total Efficiency: 84 % @ 800 W, 4Ω
TECHNICAL FEATURES ONE 700x2
• POWER RMS 700 W @ 4Ω for single channel
• DYNAMIC RANGE: 117dBA
• Parameters of nominal distortion output:
a) TDH+N: - 0.005 % @ 1 W (4Ω, 1 kHz), 0.0008 % @ 50
W (4Ω, 100 Hz)
• Low output impedence: 6mW
• Total Efficiency: 84 % @ 700 W, 4Ω
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CONTROLS DESCRIPTION
FRONT PANEL CONTROLS
1. INPUT JACK
Input jack for you bass. We suggest to use a good quality
cable, in order to obtain the best audio performance.
2. AUX-IN
3.5mm jack Auxiliar input to connect an external audio
device
3. GAIN CONTROL KNOB
Sets the input signal amount of the pre-amp
4. BASS KNOB
Increases or reduces the bass frequencies of the signal
5. MID-LOW KNOB
Increases or reduces the mid-low frequencies of the
signal
6. MID-High KNOB
Increases or reduces mid-high frequencies of the signal
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7. HIGH KNOB
Increases or reduces the high frequenciess of the signal
8. DEEP BUTTON
Gives a more deep sound
9. BRIGHT BUTTON
Gives a more bright sound
10. MID-LOW SWITCH
Use this switch to change the frequency of the mid-low
band from 185 Hz, 375 Hz and 800 Hz.
11. MID-HIGH SWITCH
Use this switch to change the frequency of the mid-high
band from 600 Hz, 1200 Hz and 1800 Hz.
12. PURE SWITCH
Allows to bypass all the equalization filters of the preamplifier. The pure-mode activation is signaled by the orange
LED on the top of the button.
13. DI KNOB
Controls the DI volume
14. HEAR KNOB
Controls the hear volume
15. HEAR OUTPUT
3.5mm plug for headphones
16.a MASTER KNOB (CH1)
Controls the overall volume of :
- the amplifier (GR-ONE 350 and GR-ONE 800)
- the channel 1 output (GR-ONE 700x2)
16.b MASTER KNOB CH2 (only for the GR-ONE 700x2)
Controls the overall volume of the channel 2 output
17. OPERATION LED
Green = normal operation.
Orange = high level of the input signal (clip).
18. VU-METER - Chromatic tuner
24 LEDs bar that can be used as VU-METER, in order to
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visualize the signal intensity, or as Chromatic tuner.
The six central LEDs, labeled by the letters B E A D G C,
are very important when the LEDs bar is used as chromatic tuner. In fact they identify six different musical notes.
Each of these LEDs will light blue or red, depending on
whether you are playing a tuned or untuned note. In the
case of an untuned note, the red LEDs on the left or the
red LEDs on the right of the six central one, will red light
up indicating a waning or increasing note respectively.
The higher is the number of red LEDs on the more important is the untuned condition.
19. LED BUTTON
By pressing this button you can: a-scroll through the four
VU-Meter display modes, b-select the mode tuner, c- turn
off the 24 LED bar.
The last selection made on this button is always memorized.
On the ONE 800 and ONE 700x2 amplifiers, pressing
the LED button for about 8 seconds allows to select the
operation mode of the fans by switching from “LIVE” to
“STUDIO” and vice- versa; a brief flash of 24 LEDs visually
displays the selection change.
In “LIVE” mode the fans will activate when the amplifier
reaches a safe temperature threshold. In “STUDIO” mode,
the fans are normally turned off; however, after several
hours of use and under rather hard climatic conditions,
the fans may turn on. Eery time the amplifier is switched
on, the operating mode is reset to “LIVE” mode.
On the ONE 350 amplifier, pressing the LED button for
about 8 seconds allows to toggles the cooling fan activation.
20. MUTE BUTTON
Turn off the amplifier output. The activation of this mode
turns on the red LED on the left of the button.
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REAR PANEL CONTROLS
AC POWER SOCKET (230V - 115V)
IEC plug for power supply connection . The power supply
self-recognation feature allows to power the GR-ONE 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.
POWER ON/OFF SWITCH
Switch on and off the amplifier.
9 VDC Out
9V DC output to connect external equipment (we recommend to connect 4-5 pedal effect maximum). The polarity
is center negative.
SEND
6.35mm jack plug to connect an external effect’s input
RETURN
6.35mm jack plug to connect an external effect’s output
DI OUTPUT
XLR plug.
The DI output is equipped with anti-bump, which allows
you to turn on and off GR-ONE even with the mixer line
still on, without causing the annoying and noisy bump.
GND LIFT BUTTON
Isolates the DI output from the ground wire.
PRE-POST DI BUTTON
Allows you to choose the type of signal to be sent to the
DI output DI: PRE EQ or POST EQ.
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SPEAKON OUTPUT
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.
LIMITED WARRANTY
The warranty covers a period of three 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. The
warranty does not cover parts which may result faulty due
to: - Negligence or careless use - Improper installation
and maintenance - Tampering made by unauthorized
personnel. - Damages that might not be related to manufacturing defects.
The manufacturer accepts no responsibility for any damage due to persons, animals or things, as consequence of
the failure to comply all the installation requirements and
/ or use indicated in this user manual.
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Note
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via Conchia n.c. 70043 Monopoli (Ba) > tel.: 347 6322 657
[email protected] > www.grbass.com > P.IVA: 07558880725
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