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Usually, a straight frequency curve can be achieved within a room angle of 60
°
. In an ordinary
room without too much damping, the higher frequencies will be correctly reproduced in the entire
room if the frequency curve in the amplifier is increased by ca. 10 dB by 10 kHz.
When selecting speakers, it may be wise to take the following into consideration:
An instrument or group of instruments which has its maximum sound effect in the medium
frequencies, will be reproduced with a greater sound power than, e.g., a church organ, which can
produce maximum sound power at 50 Hz. Relative to the level at 1000 Hz, piano music will be ca.
30 dB lower at 50 Hz, and orchestra music ca. 20 dB lower. In an ordinary living room, room
resonance will provide a certain amplification of the lower frequencies.
The sound power from an orchestra drops somewhat in the higher frequencies, typically around
10 dB at 10 kHz. This means that relatively small membranes may be utilized in the tweeter when
the lower frequencies are filtered out.
Hi-Fi System 113/106-10
This speaker is designed according to the principle of low efficiency. A full bass reproduction is
therefore achieved. The system consists of two drivers with a crossover; a woofer for low- and
medium frequencies, and a tweeter for frequencies above 3000 Hz.
