JAMO

D 830, Owner'S Manual

Page: 14 / 14

9
Reflections and dampening
The worst reflections are the so-called “flutter echoes” - that is sound which is thrown back and forth between two parallel surfaces and
thus gives a very long reverberation time. In the ideal listening room the walls would therefore be angled just a little in relation to each
other.
However, you can obtain a similar effect in a number of ways:
1. By placing for instance a painting at a slight angle in relation to the wall.
2. By hanging up curtains.
3. By hanging up/moving wall carpets or the like.
4. By placing/moving bookcases or the like.
It is of course of great importance where objects such as the above are placed in the listening room, but again you can use the “hand clap
test” to help you find the major problem areas in the room.
Dampening the wall behind the loudspeakers is usually not particularly critical, whereas the side walls and the walls behind the listening
position should generally be sound-absorbing.
From a subjective point of view, reflections from the floor and ceiling are usually the most disturbing ones. It can be difficult to do much
about reflections from the ceiling without affecting the “aesthetics” of the room, whereas it is easier to reduce reflections from the floor:
1. Physically small loudspeakers should be placed on stands (partly to obtain the right listening height, and partly to move the woofer
away from the floor).
2. Place a thick carpet between the loudspeakers and the listening position.
Generally, the room will be more anechoic the more absorption material you use, but it is important that the material is placed correctly
in order to obtain the best possible result.
The result will often be a compromise between the interior design and the optimum placing of the loudspeakers, but as you can see
already, by taking a little time you can easily improve the acoustics of your listening room without running into excessive costs.
Maintenance
GB
All Jamo loudspeakers are manufactured in modern and
thoroughly tested materials, which normally do not require
any maintenance other than vacuum cleaning or using a
soft, dry cloth to remove dirt.
If the loudspeakers have become greasy, you can clean
them by moistening the cloth with water or perhaps using
a mild detergent.
Note:
Never use scouring powder, petrol, ethyl alcohol or solvents
to clean the loudspeakers.