Dynaudio BM10S manual Finding Optimal Settings

FINDING OPTIMAL SETTINGS

frequency response; see fig. 13. In the same manner, with the cross-over frequency for the main speakers set too low (cross-over freq. for the subwoofer too high), there will be too much of an overlap between subwoofer and main speakers, again resulting in incorrect overall frequency response; see fig. 14. Correct settings are illustrated in fig. 15.

Fig. 13

Subwoofer cross-over frequency set too high (main speakers too low): Bump in frequency response.

Fig. 15

Subwoofer & main speakers cross-over frequencies set correctly: Smooth frequency response.

Many multi-channel processors and receivers provide elaborate bass-management systems where the cross-over frequency for both subwoofer and main speakers can be set. If you are using such a bass-management system, you can select the "Flat" setting on the subwoofers remote control, as all filtering has been done by the bass- management system. Carefully follow the instructions for the amplifier/processor or receiver.

Fig. 14

Subwoofer cross-over frequency too low (main speakers too high): Gap in frequency response

• If you are using your system's bass-management system, ensure that the subwoofers cross-over frequency hasn't been set to the same or lower frequency compared to the setting chosen with the bass management system.

•Selecting the correct frequency depends to a large extend on the main speakers. Sometimes main speakers are specifically intended to work with a subwoofer. In such cases, the main speakers can get damaged by a full-range amplifier signal. If in doubt, check the instruction manual for the main speakers for any restrictions or recommendations.

Of course it is possible to combine the subwoofer in a system where the loudspeakers are being fed with a full- range signal. In that case, setting the cross-over frequency for the subwoofer depends very much on the natural roll-off frequency in the bass of the main speakers. In general, a large, floor-standing speaker will still have significant Output in the deeper bass range, in which case the cross- over frequency should be set to 60Hz. A small or very small speaker will have less deep bass Output in which case the setting should be 80Hz. or 100Hz. To find the correct setting in such scenarios:

•Play a music track that has a significant amount of bass over a large bass region. An instrument such as a double-bass or bass-guitar is very suitable. Starting with the "60" Hz position (first button left in row No. 3 in fig. 6), use this track to set the subwoofers relative volume level.

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