High-Powered & Lightweight
GR Bass ONE800 bass amp head delivers 800-watts of studio quality sound. Gone are the days of needing a big heavy power amp. It's also so compact that'll fit in the front pouch of most bass gig bags!
Recording Studio Bass Preamp
In addition to being a great bass amp head for live stage, the ONE800 preamp is studio quality for recording tracks. The rear panel XLR DI output connects to your DAW interface or studio mixer. Dial in your sound using the 4-band EQ, 6 selectable Mid frequencies, Deep and Bright filters.
Headphone Output For Private Sessions
ONE800 bass amp head has a headphone amp with front panel connections for your bass, your headphones, and smartphone/audio source. You can jam along with songs or practice anytime without disrupting your family or neighbours.
GR Bass ONE800 Bass Amp Head - Specifications
Power: 800W RMS 4 ohm, 400W RMS 8 ohm
1/4″ Jack: Instrument input
1/8″ Jack: Audio input
Gain: Sets instrument and DI level
Deep button: Boost +5 dB @ 50 Hz
Bass knob: Boost or cut ± 13 dB max @ 50 Hz
Mid-Low switch: Assigns the frequency of the Mid- Low knob
185 Hz, Q = 1.2, switch pos 1
375 Hz, Q = 1.2, switch pos 2
800 Hz, Q = 1.2, switch pos 3
Mid-Low knob: Boosts or cuts the assigned Mid-Low frequency
± 12 max dB (peaking control)
Mid-High knob: Boosts or cuts the assigned Mid-High frequency
± 12 max dB (peaking control)
Mid-High switch: Assigns the frequency of the Mid- Low knob
600 Hz, Q = 1.2, switch pos 1
1.2k Hz, Q = 1.2, switch pos 2
1.8k Hz, Q = 1.2, switch pos 3
High knob: Boost or cut ± 13 dB max @ 7.6k Hz
Bright button: Boost +6 dB @ 9.6k Hz
Pure Switch: EQ/Preamp bypass
Master Volume: Speaker output level
Speaker Button: Mutes speaker output
1/8″ Jack: Earbuds/headphone jack
Speaker Output: 2x Speakon 1/4″ Combo
XLR Output: PA or DAW recording interface
Ground Lift Button: Lifts XLR output ground
Pre/Post Button: Assigns EQ or EQ-bypass to the DI output
FX Loop: 1/4" Send and Return jacks
9VDC Power Port: 300mA effect pedal power supply
AC Input: 115-230v (auto selectable)
Dimensions: 10″ x 8″ x 2″
Weight: 5 lb.
Origin: Made In Italy
Carry Bag: GR Bass amp bag (included)
Peter W Andersen (verified owner) –
This head is extremely portable and versatile. The graphics are small and a bit hard to read but then again the amp is compact and jam-packed with features. It’s plenty loud, I don’t think I’ve turned it up past 10 o’clock. One cool feature is the Pure setting, which overrides the EQ and gives you the unaltered sound of your bass. I also appreciate the headphone and aux input jacks so I can use the head as a practice amp. The built-in tuner is a plus.
Mike Hill (verified owner) –
Phil Woodard (verified owner) –
The best amp I have ever owned. During the time I have owned it, I have done gigs of varying sizes and volume levels and it has always astounded and pleased me. This amp is loaded with features, but up to this point I have only ever used the tone controls at 12 o’clock. Compliments galore from others on my sound too. Thanks, Dave. for recommending!
Chester –
This is a perfect amp for me. My bass sound is incredibly clear at all volumes. It’s 800w so I have plenty of headroom (even in larger rooms I’ve never had to turn it past 4) but it’s light enough to carry comfortably in a bag on the subway. It has a tuner onboard which is a feature I can’t live without. The DI is great and it performs very well in the studio, plus it has a level control so you can adjust the level output. I live in a condo so I practice mostly through headphones and I love that the headphone output has a volume control. I haven’t used the LED features or any of the EQ (I usually just set everything flat) but there are lots of options. It’s also very well built with thick sturdy metal that somehow manages to still keep the weight down. I’m not a big gear guy and usually play the same stuff until there’s a deficiency I need to address (this replaced an amp that didn’t have enough power) and this has everything I need and more. This amp will most likely be with me for the rest of my playing career.
Tod Stewart (verified owner) –
I’d say Tim pretty much nailed it. There’s really nothing not to like about this little beast. Clean, lean (and light), and mean (if you want to push ‘er); a small package that delivers a ton of punch. I paired this with the Aerotech 2×12 Slim and it’s a pretty killer marriage. Slices right through the mix, with loads of headroom to spare. My band is currently isolating, but that’s not stopping me from heading in to our practise room (yes, alone; no, there’s nobody else around) now and again to see what else this puppy can do. Tim didn’t mention this – but it’s kinda cool: 9V, 300ma out on the back to power pedals. And, yeah, a mute that engages the tuner…duh!
I recall (I think) Dave saying he was out of the amp business…welcome back!
Tim –
Club Bass has always carried and recommended the right product. When I inquired about GR, all Dave said was “you’ll want this”. Right away, it was so much of what I was looking for and so much more. At 5 lb. this was super portable and compact (enough to fit in my bass gig bag’s side pouch) but plenty of power to play with a full band with multiple singers or even a choir. I was totally worried about power but after a year of gigging with it I’ve never been left wanting. The on-board tuner designed for the modern bassist (goes to both B and C!) means I don’t have to bring my entire pedalboard to a quick rehearsal. And what? A mute button that automatically engages the tuner? Don’t you think that would be obvious? Yes, and so did GR. And yes the lights are super fun:)
So then comes covid, I’m itching to play, and what do you know there’s a super handy headphone jack which means I can play, crank the volume and not disturb the rest of my family stuck in our bungalow. And yes…AUX IN to play along with whatever stem or track I want! The clean, adjustable and reliable DI has also made it perfect to plug into my DAC for recording and laying down lines. Sure the EQ is nice and super flexible, but with all time and money spent on pedals and preamps and strings and the right tonewoods, the PURE switch gives me exactly what i’m putting into the unit. And while many say “true bypass” and don’t deliver, the GR delivers a clean, incredible wide range, and full signal. While I usually like a pretty modern tone, I’ll be honest that I’ve been recently learning to love a real vintage sound that I’ve been dialing into this little beast. So yes, it is changing the way I play and sound.
What else can I say? I love this amp. And did I mention it’s only 5 lb.?
thanks Dave