Our 18″ passive, sealed sub is an affordable, versatile sub that can either be powered by a dual channel master Hamrammr Active Sub 18 or another external power source.


This sealed, high powered sub will provide both excessive levels of SPL in combination with quick and precise response. This passive version can be powered by the additional channel available on the active sub 18, or by an external amplifier.

– Bjørn Erik Forberg, Chief Designer

Our 18″ passive model is can take power from the secondary channel of the active sub 18. Cable management for power & signal is easy as there are cable channels on three locations (bottom and both sides).

Our passive sub 18 is built in a very strong 25mm birch plywood material, providing it with the rigidness required for even the most demanding applications.

Both sides also has passages, allowing for cables to be easily, hidden and elegantly run over from the active sub.

The sub is also supplied with a neat, magnetic front cover, allowing it to also be placed free standing if not installed in a front baffle wall. The sub includes removable feet, as well as a cable management hole also at the bottom, allowing for hiding the power and signal cable.

The removable rubber feet provides decoupling as well as spacing for hidden cables run underneath the sub.


Speaker type Sealed 18" sub designed by Hamrammr
Amplifier -
Driver size 18"
SPL 120dB peak in-room
Power handling RMS / MAX 1000W / 2000W
Xmax 22mm
Magnet Ferrite
Voice coil diameter 3"
Impedance 4Ω (Dual coil 2Ohm)
Frequency response 14Hz - 200Hz (-3 dB) / 11Hz - 200Hz typical in-room 
Dimensions / weight 111cm (H) x 55,7cm (W) x 35cm (D) / 65 kilos
Cabinet construction 25mm birch plywood & tour-grade textured finish
Application Baffle wall or free standing subwoofer
Included accessories 3m speakon cable (220V) 



Hamrammr Sealed Sub 15 in blue, Sealed Sub 18 in red. In-room response is typically 3Hz lower. Please disregard SPL, this is only the level chosen for the measurement, not the maximum obtainable SPL by the subwoofer.