(7 customer reviews)


In stock (can be backordered)

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SKU: 180-11491 Category:



The KSR Amplification RCS/412™ straight cabinet combines unique design with superior construction techniques. Tuned for superb low end performance while minimizing brittle highs, this is the last cabinet you will ever need. Removable casters and recessed hardware come standard.


The cabinet is constructed of 3/4″ Baltic (Russian) birch plywood with locked rabbit joints. During construction all joints are glued, pinned, clamped, and cured for maximum strength. The front baffle is secured with 12 screws from the inside allowing for easy grill cloth replacement. The rear panel is removable via 20 steel screws. All panels and hardware are gasketed making for an air-tight sealed cabinet. The handles and rear cover are recessed, further illustrating our commitment to building the best cabinet possible.


A parallel-mono jack plate wired for 16 ohms comes standard. Automatic mono/stereo switching is available via a Plug and Play jack plate. The standard stereo jack configuration is 16 ohms mono and 8 ohms stereo.


The front speaker panel is angled slightly to reduce the interaction of sound waves reflected off the cabinet back and into the speaker cone. This angle also points the speakers up a bit giving you similar benefits of a slant cab in a more solid and versatile straight package. The angled front along with a sturdy internal baffle ensure solid bass response with little resonance due to standing waves. The end result: Unbelievable bass response that is super tight and never ‘boomy’ or ‘flubby’.


A wide array of speaker and covering options are all available standard. Choosing various speaker types allows you to refine the overall response to your playing. If you’d like speakers installed that are not listed, please contact us. If you already have speakers, unloaded cabinets are available. All wiring and instructions are included for an easy installation.


Cabinet Dimensions: 31″ Wide x 31″ Tall x 14″ Deep, approx. 95 lbs.
Shipping Dimensions: 36″ x 36″ x 18″, approx. 115lbs.

Additional information

Weight 115 lbs
Dimensions 36 × 36 × 18 in

7 reviews for RCS/412

  1. frankthearanda

    Bought one on a whim while attending NAMM 2017. Kyle had a cabinet with V30 + K100 in an X pattern in his booth connected to a colossus. I had owned my Colossus for maybe close to a a year at that point but played it through a Mesa OS 4×12

    I was pretty damn surprised to see just how much beefier and tighter sounding Kyle’s cabinet was. I loved the combination of the speakers and for being technically a smaller cabinet than the Mesa it sounded wayyyy bigger.

    On top of how good it sounded it was actually a loaner cab used by Sikth while on tour with Periperhy late 2016! Bit of fame attached to this beautiful beast

    Last day of NAMM I sent Kyle the money and rolled my very own KSR 4×12 out to my truck. I’ve had friends play through the cab who were also Mesa users and the comment is always the same..

    ‘My guitar has never sounded this good’

  2. educz1

    This beast is built like a tank. Just as great as Mesa and orange. Big, tight and musical. Heavy as hell too but totally worth it. Another true 5/5 KSR product. Shocker.

  3. mesaboogie6l6 (verified owner)

    I got this cab unloaded since I had my own EVM12L’s, the KSR crew is awesome and they loaded the speakers in my cab and laser engraved the backplate. It sounds incredible, very loud, punchy, no flubs and absolutely crushes!! 5 stars!!

  4. jake.nielsen88 (verified owner)

    I ordered this cab with vintage 30’s and green backs in an X pattern. As soon as I plugged it into my Colossus head, I was instantly blown away. It sounded so crisp and clear yet so fat. The vintage 30’s and greenbacks are such a great combination as well. Expectations were definitely exceeded!

  5. Simon Chikov (verified owner)

    Great cabinet

  6. Joseph Hibbs (verified owner)

    Absolute Top Notch Build. And Service.

  7. Daniel Carey (verified owner)

    What a fantastic cab! Sounds as good as it looks and it got here in perfect condition! Will be pairing it with a Head and another cab. Thanks Kyle and team!

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