Holly Blue bass cabinets were made of lightweight poplar multiplex. Equipped with neodymium speakers for bass (reflex channel in the back) and in the midrange. Silk dome tweeters were used for the high frequency range, which are protected from overload by a PTE protection circuit just like the midrange speaker.
The cabinets were coated as standard with black Polyuria, which not only looks very classy, but is also extremely scratch-resistant and can withstand the highest mechanical loads.
Three different models were available. The models 10er, 12er and 15er. The 10er and 12er were designed as three-way systems, with the bass speaker housed in its own cabinet. The 15er offered the optimal complement for abysmal bass or as a standalone for pure vintage sound. All three models work together physically and acoustically optimal and can be combined without restrictions.