Dynaudio LYD 7 Manual de instrucciones - Página 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.

Reference material

•

RTA Spectral Analyzer

Play some recorded material that you are familiar

•

Pink Noise Source

with through the speakers to see if the sound

is what you expect. Adjust the tilt filters both

Dynaudio has created an iOS app with these

directions to hear the different tonalities that

tools built in so you can quickly test and calibrate

are possible. It is also suggested that you listen

your LYD speakers using your iPhone, iPad or

to material you know actually sounds bad or

iPod touch. In the Apple App Store, search for

has defects in the recordings. A truly neutral

"Dynaudio Meter" to locate and download this

loudspeaker will reveal these defects clearly.

free app.

The whole point to a good loudspeaker is to

You can connect the device directly to the

get accurate representation of the sound, good

speakers using a conventional headphone to RCA

or bad, so that mix decisions can effectively be

adapter. Play the pink noise from the Dynaudio

made. Adjust the tilt filter to the setting you are

Meter and adjust the level for a reasonable

most comfortable with.

playback volume. If you wish to play pink noise

from your computer workstation, a WAV file

Pink noise

containing pink noise is available at:

For an objective test of the speaker's response,

www.dynaudio.com/pinknoise

you will need a metering system. This consists

of a device that can measure the spectral output

of the loudspeaker in real time and a source of

pink noise that can be played back through the

loudspeakers.

Play the pink noise through one speaker at a time

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

iPhone or iPad at the listening position. Change

the Sound Balance filter to see how the response

changes the response curve in the RTA. Pink

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 frequencies,

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

reference 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

loudspeakers.

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

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

typical control room.

will reduce the effect of first reflections and

improve the sound of the system. The thicker

First reflections can be located easily by using a

the acoustic material is, the more effective it will

mirror placed on various surfaces in the studio

be. Also, creating an air space behind the material

to check if you can see either loudspeaker in

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 frequency

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

its wavelength is about 8 meters. What this means

Figure 7: Reflection diagram

Listening tests / Final tweaks

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

resulting 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.