Gr Bass AT 212+ SLIM-4 BLK BLACK

Historical Context and Positioning in the Range

The GR Bass AT 212+ Slim-4 BLK fits within the brand's philosophy: offering high-end bass cabinets designed for musicians who want a large power reserve and excellent clarity without the burden of traditional heavy setups. With its 2x12 format and carbon fiber design, it clearly targets mobile bassists (rehearsals, tours, club gigs) seeking a professional, compact, and easy-to-transport solution while maintaining a strong stage presence.

Who This Amp Is For

This model is aimed at intermediate to professional bassists who already use an amp head (or preamp) and want a cabinet capable of handling serious volume levels. It is particularly relevant for rehearsals and live concerts, where the 2x12 offers an excellent balance between low-end breadth and midrange precision. In the studio, its extended response and high sensitivity facilitate achieving a clean, articulate sound that sits well in the mix.

In terms of styles, it excels whenever definition is required: funk, pop, modern rock, metal (attack and sustain), jazz fusion, and contemporary music. Thanks to the adjustable tweeter, it can also be tamed for more vintage aesthetics by softening the high frequencies.

Features and Innovations

The GR Bass AT 212+ Slim-4 BLK is a 2-way bass cabinet built around two 12-inch neodymium woofers and a 1-inch tweeter. The key element for adapting to playing context is the tweeter attenuator with 4 positions : convenient for switching from a bright slap sound to a rounder tone, or to compensate for overly reverberant rooms. The bass reflex design with rear port enhances the low-end spectrum and improves depth perception while maintaining tight bass when pushing volume.

Its "slim" format is designed for ergonomics: reduced footprint, simplified transport, and better integration on small stages. The carbon fiber provides excellent cabinet rigidity, which limits unwanted vibrations and contributes to clearer projection, especially in the low-midrange, a key area for being heard within a band.

Sound

With its 2x12 configuration, this cabinet sits between the punch of a 4x10 and the breadth of a 1x15: delivering present but fast lows, well-defined mids, and a very "immediate" response to right-hand attack. The neodymium magnets promote a sense of dynamics and precision, ideal for articulated playing (ghost notes, pick, fast passages) and active basses.

The tweeter adds air and detail necessary for slap, harmonics, and modern tones. Reducing it yields a softer, more organic sound that emphasizes the note rather than finger clicks. The high stated sensitivity contributes to excellent efficiency: at equal power, the cabinet reacts loudly and cleanly, allowing more headroom on the amp head and better control of dynamics.

Technical specifications

Category	Bass cabinet	Number of speakers	2
Cabinet impedance (Ω)	4 Ω	Color	Black
Attenuator	Yes	Finishing	Black tolex
Speaker diameter	12"	Power output	900 W

Power handling	900 W RMS	Port	rear
Impedance	4 ohms	Material	carbon fiber
Configuration	2 neodymium 12-inch woofers	Finish	Black
Tweeter	1 inch	Dimensions (W x D x H)	74 x 38 x 35 cm
Tweeter level adjustment	4 positions	Weight	12.9 kg
Frequency response	35 Hz to 22 kHz	Power supply	220 V
Sensitivity	103 dB	Tubes	none
Type of enclosure	bass reflex	Cords	not applicable