Dynaudio BM 10S Finding The Optimal Settings, Multiple subwoofers, Finding the correct settings

FINDING THE OPTIMAL SETTINGS

Multiple subwoofers.

By using carefully positioned multiple subwoofers it is pos- sible to even out the different room-modes and thus create a more coherent overall bass response in the room. It is worth experimenting with different locations around the room for the additional subwoofers, even using the rear of the room. As adding subwoofers will not increase the effect of room-modes, even adding a subwoofer without much care or thought to positioning is likely to help even out room-modes.

Always position subwoofers at least 1 mtr/3 ft away from a television as the magnetic field emanating from the subwoofer may otherwise distort the

picture. If you see discolorations on the television screen, try moving the subwoofer and other speakers close by away from the television.

Finding the correct settings

Before deciding on a final setting, you will probably want to experiment with both location and adjustment of the subwoofer. Here, the subwoofers presets will prove an ideal tool. When trying to decide on a particular location, simply store the settings that are best for the location and swap back and forth, using the appropriate preset every time. Refer also to section "Storing and recalling a Preset" in Chapter "Adjusting and using the subwoofer".

•When experimenting to find the optimal settings, use a couple of music tracks with repetitive bass across a large spectrum. The tracks should be sufficiently different from each other and each should cover a wide bass-range. Musical instruments, such as a double-bass, bass guitar, church organ, etc. covering a wide spectrum in the bass region and above, are very suitable as these depend on accurately balanced subwoofers and main speakers.

•Although in general it is best to make adjustments in the sequence outlined below, note that changing one setting may influence another. For example, finding the right setting for "Phase" may result in having to decrease "level", even if this was set correct before. It is recommended that you double-check the previous settings before moving on to the next one. Obtaining the best integration of the subwoofers generally involves a considerable amount of repeated fine-tuning.

•Once done, use the presets to store the settings. It is advisable to reserve one preset as the "system default" settings so you can always revert to this setting when you have made temporary changes to any of the settings.

Level

With the "+" and "-" Level buttons (No. 2 in fig. 6) you can adjust the relative volume level of the subwoofer to the main speakers of the system:

•Play the same track a couple of times, adjusting the level so that the instrument sounds homogenous across its range.

•If you find that at certain specific bass tones the response is either too loud (bloated sound) or soft (thin sound), it may be that you have to experiment further with the location of the subwoofer and/or the cross-over settings. Refer to the chapter "positioning the subwoofer" and section "Cross-over setting" in this chapter.

When using multiple subwoofers, ensure that all settings such as level, cross-over frequency, phase and LF extension are identical. Use the "Master"

and "Slave" mode options to ensure that all subwoofers operate on the same settings (refer to chapter "Installation and Connections", section "Master and Slave mode").

Cross-over frequency

With the Cross-over frequency setting you can select up to what frequency the subwoofer will work. Fig. 12 shows the effect of each setting. Note that curves are for explanation purposes only.

Fig. 12

Selecting the ideal cross-over frequency depends in most part on the main speakers. Ideally, the signal to these speakers has passed a low-frequency filter so that these can take over seamlessly from the subwoofer at the correct cross-over frequency. If the cross-over frequency for the main speakers has been set too high (or looking at it differently, the cross-over point for the subwoofer is set too low), there will be a significant gap in the combined

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