Dynaudio LYD 48 Посібник з експлуатації - Сторінка 11

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Dynaudio LYD Series

Listening

Once you have your speakers properly positioned, its time to start

listening to them. Subjective listening tests can be made with reference

tests

material that you are familiar with; a favorite album, movie or other

recording. Objective tests can be made simply with a smartphone

app or more sophisticated acoustic measurement system.

•

RTA Spectral Analyzer

Reference material

•

Pink Noise Source

Play some recorded material that you are familiar

with through the speakers to see if the sound

Dynaudio has created an iOS app with these

is what you expect. Adjust the tilt filters both

tools built in so you can quickly test and calibrate

directions to hear the different tonalities that are

your LYD speakers using your iPhone, iPad or

possible. It is also suggested that you listen to

iPod touch. In the Apple App Store, search for

material you know actually sounds bad or has

"Dynaudio Meter" to locate and download this

defects in the recordings. A truly neutral loud-

free app.

speaker will reveal these defects clearly.

You can connect the device directly to the speak-

The whole point to a good loudspeaker is to

ers using a conventional headphone to RCA

get accurate representation of the sound, good

adapter. Play the pink noise from the Dynaudio

or bad, so that mix decisions can effectively be

Meter and adjust the level for a reasonable play-

made. Adjust the tilt filter to the setting you are

back volume. If you wish to play pink noise from

most comfortable with.

your computer workstation, a WAV file containing

pink noise is available at:

Pink noise

www.dynaudio.com/pinknoise

For an objective test of the speaker's response,

Play the pink noise through one speaker at a time

you will need a metering system. This consists

at a reasonable level (~80-85dBA) and place the

of a device that can measure the spectral output

iPhone or iPad at the listening position. Change

of the loudspeaker in real time and a source of

the Sound Balance filter to see how the response

pink noise that can be played back through the

changes the response curve in the RTA. Pink

loudspeakers.

noise is a balanced level of noise across the entire

spectrum. In the RTA display, the reading should

be as level and even as possible.

If you notice excessive levels in the low frequen-

cies, try setting the Sound Balance filter to Bright

(B) and check the results. If the spectrum analyzer

shows a greater degree of high frequencies, set

the tilt filter to dark (D) and check the results.

Once you have the tilt filter set for the flattest

response curve in the RTA, return to your ref-

erence material to see how it sounds. Through

this process of objective tests with the RTA and

subjective listening tests with you ears, you will

arrive at the best setting for your Dynaudio loud-

speakers.

Personal Reference Monitor

Final

Beyond the settings for the loudspeakers, additional tweaks may be

desired to improve the response of the system and room environment.

tweaks

You may discover that a reflective surface is causing a high frequency

anomaly or perhaps room modes are disturbing the bass response

in the room.

First reflection treatment

to check if you can see either loudspeaker in

the mirror when sitting in the listening position.

Sound reflecting off of hard surfaces that are

If you can see either loudspeaker in the mirror, it

close to the listening position can cause problems

follows that upper frequencies will bounce off that

in the high frequency response and imaging of

surface directly back to the listening position and

the loudspeakers. These first reflections can be

potentially cause response problems.

relatively easy to fix in many cases. Figure 7 shows

some common causes of first reflections in a

Placing absorptive material on these surfaces will

typical control room.

reduce the effect of first reflections and improve

the sound of the system. The thicker the acoustic

First reflections can be located easily by using a

material is, the more effective it will be. Also, cre-

mirror placed on various surfaces in the studio

ating an air space behind the material will improve

its effectiveness. Place as much absorption that

is practical at the first reflection points to improve

the response of the system.

Bass trapping

If you notice any peaks or dips in the low fre-

quency response curve of the RTA (20-250 Hz),

they may be caused by room modes. Room

modes occur at specific low frequencies that

have wavelengths that are equal to or multiples

of the dimensions of the listening room.

For example, if the listening room is 4 meters

long, there may be a room mode at 43 Hz since

Figure 7: Reflection diagram

Listening tests / Final tweaks

its wavelength is about 8 meters. What this means

is that for this frequency, the room response will

change dramatically depending on the position

of the listener and the loudspeaker. You may hear

a more of this frequency or less of it depending

on the listening position in the room. Modes

can be formed from all dimensions of the room;

length, width, and height. The solution is to place

sound absorption designed for low frequencies

in the most effective places to reduce the effect

of room modes.

Many manufacturers make sound absorptive

devices called bass traps that are designed to

be placed in or near corners and will reduce the

amount of reflected low frequency energy in the

room. By dampening the resonance of the modes,

the low frequency response of the room may be

smoothed out.

When placing bass traps, always check the result-

ing frequency response curve with pink noise and

an RTA to ensure that the loudspeaker response

is improving. Then listen to your favorite reference

material to see how this affects it.