Mission Optimize Your Sound with MS-10 and MS10 Subwoofers

Stereo Reproduction

Low Pass Filter:

The subwoofer crossover point should be set having regard to the size and low frequency extension of the main speakers. The role of the subwoofer is to extend the bass response of the system, not to increase the overall bass level. If the loudspeakers are large the crossover should be set low, a value around 55 Hz is a good place to start. With smaller speakers this can be increased, up to 85Hz for the small bookshelf units. As always the final value is determined by listening.

Changing the MS-DUOOperating Mode from Front-Firing to Down-Firing

The MS-DUOsubwoofer is supplied in front-firing mode.

You can operate the subwoofer with the drive unit firing downwards (amplifier at the rear) or firing forwards (amplifier beneath the subwoofer).

To change the mode from down firing to front firing:

Low-level Listening

Our ears are far more sensitive to midrange frequencies (2-5 kHz) than bass frequencies. Very low bass and especially percussive bass is ‘felt’ rather than heard. At low sound levels bass frequencies appear to attenuate faster than midrange and treble. As the level increases this bass roll-off decreases. Occasionally we may wish to listen to a normally loud piece of music at a low level but with retention of the bass information.

Testing the system

The simplest way to test the system is to play, at a moderate level, music with deep consistent bass. Switching the subwoofer on and off should cause change of the depth of bass, and the ambience will also alter. If there is a significant change in bass volume, or a noticeable step in the bass response, or an increase in coloration when the subwoofer is playing, the setup needs to be refined. By selecting different crossover and volume settings, you will be able readily to identify the most favourable combination.

Remove the grille from the front of the loudspeaker

b

Place a towel or similar on the ground.

Invert the subwoofer and place it carefully on the towel. Remove the four cone feet from the subwoofer

c

Dolby Labs Recommended 7.1 Placement

Left Front

Centre	LFE	Right Front
	22º	30º

	Mode
Front	Firing

Screw the cone feet tightly into the holes that held the pegs Stand the subwoofer on its feet as shown in the illustration

e

Unscrew the four pegs that held the grille in place

d

Left Surround

90º

110º

135º

150º

Right Surround

Down	In down firing mode the grille must be removed
Firing
Mode	Store the grille and the pegs safely for future re-use.

Left Back

Right Back

Reverse the procedure to change the mode.

(Single Back channel for 6.1

Which mode should I use?

You should experiment with different operating modes to see which one you prefer. Here are some notes which may help you.

￿Front firing mode keeps the drive unit away from walls and offers a better focussed sound with lowest bess distortion.

￿If your floor is a hard wood or stone floor, front-firing will offer advantages especially if you are using a suspended wood floor.

In front firing mode the amplifier faces downwards so there are some potential disadvantages:

￿ If you have a deep shag pile carpet, there may be insufficient ventilation for the amplifier and we do not advise you to use this mode of operation.

￿ Although the Subwoofer controls are designed to be “set and forget”, if you are likely to adjust the controls often, down firing mode is easier for day to day use.

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