Cab Pack “Mars PR-M55” 是基于老式英国 4×12 箱体的脉冲响应 (IR) 系列，带有极为罕见的 pre-Rola? Celestion? T1511 Greenback 扬声器，带有中等磁铁和 55Hz 低音锥。这些扬声器具有与 T1281 相同的音盆和与 T1221 相同的磁铁，因此它们是杂交经典。
Cab Pack “Mars PR-M55” is an impulse response (IR) collection based on a vintage British 4×12 cabinet with extremely rare pre-Rola? Celestion? T1511 Greenback speakers with medium magnets and 55Hz bass cones. These speakers have the same cones as the T1281 and the same magnets as the T1221 so they are crossbreed classics.