if these were made from conventional materials such as paper or plastic

HELIX PF K130

Power: 70 W RMSImpedance: 4 OhmFS: 97Hz

STEG K2|04D Stereo Power Verstärker Class D

Dual 1 & 2 Ohm

ESX QL600.4 (24V) Packaging Unit:Individually if these were made fromESX Quantum Series The compact QUANTUM QL amplifiers are technically the smaller siblings of the QUANTUM QE models. They are ideal for use where installation space is at a premium. They are also emission free and, like the large QE models, have the finest Class D technology on board, which leaves nothing to be desired in terms of performance, sound quality and setting options. The space saving remote control is also included with the QL models. The