MartinLogan Dynamo 700 Specifications download pdf (Page 13)

room acouStIcS

Home Theater 13

This is an area that requires both a little background to

understand and some time and experimentation to attain

the best performance from your system. Your room is actu-

ally a component and an important part of your system.

This component is a large variable and can dramatically

add to or subtract from a great sonic experience.

All sound is composed of waves. Each frequency has its

own wave size, with the lower, or bass frequencies literal-

ly encompassing from 10 feet to as much as 40 feet. Your

room participates in this wave experience like a swim-

ming pool with waves reflecting and becoming enhanced

depending on the size and shape of the room and the

types of surfaces in the room.

Remember that your audio system can actually generate

all of the information required to recreate a sonic event in

time, space, and tonal balance. Acoustically, the role of

an ideal room would be to neither delete nor contribute

to that information. However, nearly every room does to

some degree.

Terminology

Standing Waves

Sound coming from a speaker bounces around in a room

untilapatternemerges—thisiscalledastandingwave.

Typically, this is only a problem with frequencies below

100Hz. When this happens different parts of your room

experience either an excess or a lack of bass.

Some people believe that having a room without parallel

walls will eliminate this effect. The truth is that non-parallel

walls only generate different standing wave patterns than

those that occur in rectangular rooms.

Usually, you can excite most of the standing waves in a

room by putting the Dynamo 700 in a corner. Listening

position determines which standing waves you will expe-

rience. For instance, if you sit in a corner you will hear

most of the standing waves. This can be an overpowering

experience. Sitting next to a wall can also intensify the

levels of the standing waves that are experienced.

Resonant Surfaces and Objects

All of the surfaces and objects in your room are subject to

the frequencies generated by your system. Much like an

instrument, they will vibrate and "carry on" in syncopation

with the music, and may contribute in a negative way to

the sound. Ringing, boominess, and even brightness can

occur simply because surfaces and objects are "singing

along" with your speakers.

Resonant Cavities

Small alcoves or closet type areas in your room can be

chambers that create their own "standing waves" and can

drum their own "one note" sounds.

Solid Footing

After living and experimenting with your Dynamo 700,

you may want to use ETC™ (Energy Transfer Coupler)

Spikes (see figure 11). With the use of these spikes, the

Dynamo 700 will become more firmly planted on the

floor and, consequently, bass will tighten. It is best not

to implement the spikes, however, until you are secure in

the positioning, as the spikes can damage the floor if the

subwoofer is moved.

Spike Installation Instructions:

1 Carefully lay the Dynamo 700 on its side to gain

access to the bottom of the feet.

2 Firmly press the spikes into the feet of the Dynamo 700.

Caution: Make sure your hands and any cabling are

clear of the spikes. Do not slide the subwoofer as spikes

are sharp and can damage your floor or carpet.

Your Room

Figure 11. To install the spikes, press them into the feet.

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MartinLogan Dynamo 700 Specifications Page 13

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