http://www.troelsgravesen.dk/26W-4558T00.htm

What has to be taken into account when dealing with subwoofers, is the room-gain. The room is an amplifier and adds to the low end response as can be seen from above from placing the driver 50 cm from front wall, 30 cm from the floor and 180 cm from side walls. We get some 4-5 dB extra from such placement. The reason a lot of subwoofers work at all because efficiency is sometimes appallingly low.
appallingly = mies, erbärmlich, erschreckend.



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