In the upper section of the calculator the reverberation time within the listening room is calculated depending on the construction, the size, and the furnishings of the room. Based on the reverberation time, the selected loudspeaker’s frequency response at the listening position is then calculated in the lower section of the calculator. The loudspeaker data were determined at the measuring laboratory of the testing journal Stereoplay.
In the floor plan and section drawing of the room the loudspeaker the calculated frequency response applies to is shown in dark gray. To change the position of the loudspeaker or listener, click on the appropriate symbol and then move it with the cursor keys.
Which is the ideal loudspeaker position? The general rule is: The smoother the frequency response, the more balanced the sound of the loudspeaker will be. For most loudspeakers this is the case when they are positioned as solitarily as possible within the room. If the low frequency transfer function shows excessive peaks usually an irritating booming develops at the corresponding frequencies. A sharp drop in the low frequency transfer function, however, is not critical. Only if the level remains low over a relatively broad range the listener will feel the bass to be too faint. The calculator can help you to find good positions for the loudspeakers. Final adjustment, however, should always be based on listening tests.
If a loudspeaker model cannot be found in the database a similar model of the same manufacturer can usually be used. The important thing is that the bass chassis and bass reflex openings as well as their positions are similar, since each bass sound source of a loudspeaker individually enters into the calculation of the frequency response.