GR Bass ONE 800 / ONE 1400 Bass Amplifier Heads - 800 Watt

GR Bass ONE 800 / ONE 1400 Bass Amplifier Heads

The GR Bass ONE 800 / ONE 1400 Bass Amplifier Heads are lightweight professional bass heads offered in 800W and 1400W configurations. The ONE 800 delivers 800W RMS at 4 ohms, while the ONE 1400 uses two independent 700W power sections for a combined 1400W RMS at 4 ohms.

Both models suit bassists who need a compact amplifier head for live performance, rehearsal, touring, or studio monitoring without giving up flexible tone control. A four-band EQ, six selectable mid frequencies, Deep and Bright filters, Pure EQ bypass, integrated tuner, effects loop, DI output, auxiliary input, and headphone monitoring provide a versatile signal path for professional bass rigs.

The shared ONE platform includes a 24-LED VU meter with chromatic tuner functionality, selectable Studio and Live fan operation, an anti-bump XLR DI, and a 9V accessory power output. The 800W model uses a single master level, while the 1400W version provides independent master controls and speaker outputs for its two 700W amplifier channels.

Key Features

• 800W or 1400W Configurations: Choose the ONE 800 for 800W RMS at 4 ohms or the ONE 1400 with two independent 700W RMS channels.
• Four-Band Equalization: Low, Mid-Low, Mid-High, and High controls provide detailed adjustment for different instruments, cabinets, and rooms.
• Selectable Mid Frequencies: Switch the Mid-Low band among 185, 375, and 800 Hz and the Mid-High band among 600, 1200, and 1800 Hz.
• Pure Sound Bypass: Bypasses the preamplifier equalization filters when a flat signal path is preferred.
• Integrated Tuner and VU Meter: A 24-LED display provides multiple level-display modes plus chromatic tuning functionality.
• Professional DI and Effects Loop: XLR direct output, pre/post EQ switching, ground lift, Send, and Return connections support live and studio routing.
• Independent 1400W Architecture: The ONE 1400 provides separate master control and speaker output for each 700W amplifier channel.
• Studio and Live Cooling Modes: Selectable fan behavior supports both performance environments and quieter recording applications.

Technical Specifications

Variant Options

• ONE 800: 800W RMS at 4 ohms; 400W RMS at 8 ohms
• ONE 1400: 1400W RMS total; 700W + 700W at 4 ohms; 350W + 350W at 8 ohms

Amplifier Performance

• Dynamic Range: 117 dBA
• THD+N: 0.005% at 1W into 4 ohms at 1 kHz; 0.0008% at 50W into 4 ohms at 100 Hz
• ONE 800 Total Efficiency: 84% at 800W into 4 ohms
• ONE 1400 Total Efficiency: 84% at 700W into 4 ohms per channel

Equalization and Controls

• Equalizer: 4-band
• EQ Controls: Low, Mid-Low, Mid-High, High
• Mid-Low Frequencies: 185 Hz, 375 Hz, 800 Hz
• Mid-High Frequencies: 600 Hz, 1200 Hz, 1800 Hz
• Deep Filter: Yes
• Bright Filter: Yes
• Pure Sound: EQ and filter bypass
• Gain Control: Yes
• DI Level Control: Yes
• Headphone Level Control: Yes
• ONE 800 Master Control: Single master volume
• ONE 1400 Master Controls: Independent Channel 1 and Channel 2 master volumes
• Mute: Yes
• Meter: 24-LED VU meter with multiple display modes
• Tuner: Integrated chromatic tuner
• Cooling Modes: Studio and Live

Front Panel Connections

• Instrument Input: 1/4" input
• Auxiliary Input: 3.5 mm
• Headphone Output: 3.5 mm

Rear Panel Connections

• DI Output: XLR with anti-bump circuitry
• DI Routing: Pre/Post EQ selectable
• Ground Lift: Yes
• Effects Send: 1/4"
• Effects Return: 1/4"
• Accessory Power Output: 9V DC, 300mA, center-negative
• ONE 800 Speaker Outputs: 2 speaker outputs
• ONE 1400 Speaker Outputs: 2 independent outputs, one for each 700W channel
• Speaker Connection: Compatible with 2-pole Speakon connection and 1/4" plug
• AC Power: 115V / 230V auto-sensing

Physical Specifications

• ONE 800 Dimensions: 10.4" W x 8.7" D x 2.2" H
• ONE 800 Weight: 5.3 lb
• ONE 1400 Dimensions: 12.2" W x 8.7" D x 2.2" H
• ONE 1400 Weight: 6.3 lb

What's In the Box

• GR Bass ONE 800 or ONE 1400 Bass Amplifier Head
• Power Supply Cable
• User Manual