The SG-FATBOX is an iso cab made of 25mm MDF for even better sound insulation and covered with robust structural lacquer.

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Product Description


The SG-FATBOX is an iso cab made of 25mm MDF and covered with robust structural lacquer. The FATBOX was already in program 10 years ago and returned with the 10 years edition. Thicker walls ensure even better sound insulation. The 18mm birch plywood baffle is the absolute industry standard for bulding professional guitar cabinets..
The bottom part of the cabinet provides space for a 12″ speaker. Above it, up to three microphones can be attached to the specially designed microphone stand. Your “recording room” is contained within the removable hood.

The microphone stand

With the robust microphone holder your microphone stays where you put it! The extremely solid design allows you to choose any position you want and will last for years of constant use.

The microphone cable

The microphone cable is wired with NEUTRIK XLR jacks and plugs. Used in the Grossmann iso box is the Sommer Cable SC-SOURCE MKII HIGHFLEX 2 x 0,25mm – originally this microphone cable was developed for manufacturers of professional studio microphones such as BPM and Schoeps.

The reording room

Schwarz Kante vintageThe extremely small dimensions of the “recording room” contained within the hood of the SG-FATBOX and the resulting reflections naturally create a different acoustic environment than in a large studio space. The hood contains a resonance absorber in addition to the acoustic foam, which is effective at suppressing extreme buildup of specific frequencies (room modes). Without this feature, miking at distances of over 3 inches from the speaker would result in significant coloring.


fire rapid easy speaker change unit: the FRESCU system makes replacing speakers quickly and easily without tools simple. You can insert different speakers in order to access a variety of sounds: Simply loosen the hand screws, turn the pins sideways, remove the speakers and unplug the cable. We also provide a set of cables with connectors for three speakers for extremely quick replacement and to avoid damaging the speaker contacts.

Bass speaker friendly

The Grossmann iso cab can also be used with bass speakers. FRESCU makes it easy to insert our 10″ bass speakers – they come with an insert set (reducer ring) for the 12″ guitar speaker opening.

Isolation feet

The parabolic rubber feet round out the concept. They ensure that very little structure-borne sound is transferred to the ground by creating an acoustic barrier to the floor. 

Technical specs

Material: 25mm MDF (housing) / 18mm birch plywood (baffle)
Dimensions: (W x H x D): 450 x 840 x 410 mm
Weight: about 30kg (without speaker).