Bedienungsanleitung Cambridge Audio Azur 751R V2 (Seite 17 von 40) (Englisch)

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ENGLISH

The 751R V2 allows level calibration to match the acoustic level between

different types/sizes or even manufacturers of speaker that may be being

used for each channel. This is achieved by adjusting the relative level of each

speaker. This can be done manually through the 'Level Calibration' menu in

the OSD or automatically, see the following Audyssey auto setup section of

this manual.

The basic process for manual adjustment is to listen to or measure with a

Sound Pressure Level (SPL) meter (more accurate and recommended but

not essential) the level of sound produced by each speaker and set relative

levels for each speaker so that they all sound the same loudness at the

normal listening position. The 751R V2 incorporates a Test Signal Generator

(broad-band white noise) to facilitate this.

Press the OSD button on the remote control then select the 'Level Calibration'

menu. Now turn on the test signal by highlighting this item and pressing the

Left or Right arrows:

Level Calibration

Test Signal :

Front L :

Front R :

Surround L :

Surround R :

Centre :

Subwoofer :

Surr. Back L :

Surr. Back R :

Return I/O

Off

0db

You can now move up and down the channels using Volume Up/Down on

the remote. Each time a new channel is selected the test signal will be heard

to move to that channel. Compare the loudness of all channels as heard at

the listening position.

A "rushing" or "hissy" sound should be heard.

Now adjust the channels so they all sound the same (in terms of loudness

only, channels of different frequency responses can sound different in terms

of the "tone" of the sound i.e. more or less hissy).

Pick the channel that sounds most different and select it to listen to the

test signal. Now adjust the relative level in dB (using Arrow left/right on

the remote) and continue comparing it to other channels until it is of equal

loudness. The level can be adjusted up to + or - 10dB in 1dB steps. Repeat

the process with the next most different channel. Once all channels sound

the same in terms of loudness, press the OSD button again to save the

settings and exit the menu.

Manually setting sub crossovers and

bass management

The 751R V2 performs bass management for any speaker that is set to

'Small' in the OSD. This means that bass for speakers that are unable to

reproduce bass effectively is instead routed to the subwoofer.

Speaker Crossover Menu

Front L/R :

Centre :

Surr. L/R :

Surr. LB/RB :

Return I/O

80Hz

Manually setting level calibration

The crossover adjustments in the Speaker crossover menu are used to

determine the point as which this transition is made. In other words they set

the frequency below which bass is routed away from any 'Small' speakers

and into the Subwoofer channel. It should be understood that bass sent to

the subwoofer by bass management is different to bass encoded into the

surround-sound material as a dedicated Low Frequency Effects channel.

If the source material contains a separate LFE channel (i.e. DD or DTS

material) this is always routed to the subwoofer (if it is On) and is not affected

by the crossover setting. Some encoding types (Such as Dolby Pro Logic II/IIx

and Neo:6) do not actually have a LFE channel.

The default setting for all bass management crossovers is 80Hz and is a

good global starting point. If you do not wish to make any adjustments simply

leave all crossovers at this default setting.

Note: These settings are actually only used for speakers that have been set

to Small in the Speaker Conguration Menu.

For advanced users it is however possible to adjust the speaker crossovers

used for any speakers set as 'Small' independently to allow for the fact that

you may wish to direct bass away from front oorstanding speakers (and to

the Subwoofer) at perhaps 50Hz but away from Surround Left and Rights at

perhaps 100Hz. If you wish to make these adjustments it is best to consult

your loudspeaker manufacturers documentation or contact your dealer to

determine the frequency response of your system and where each speaker

types bass response starts to tail off (often called the 3dB or 6dB roll off/

cutoff point). This would be approximately the point the corresponding

crossover should be set to.

Alternatively, the Audyssey autosetup procedure can measure and set

appropriate crossover points for your speakers.

Audyssey 2EQ

and autosetup

Using the supplied calibrated microphone, the Audyssey 2EQ system can

perform 'autosetup' by automatically determining the number of speakers

you have connected, their 'size' and crossover frequencies (for the purpose

of bass management) and their distances from the listening position.

Further to this Audyssey 2EQ can also remove difciencies in playback

caused by sub optimal room acoustics.

It does this by capturing any acoustical problems at the listening area in

both the frequency and time domain and applying sophisticated corrective

equalisation.

The result being improved sound quality, clarity of dialogue, and a well-

balanced sound for more than one listening position.

Audyssey 2EQ can also be used with Audyssey Dynamic EQ

and Audyssey

Dynamic Volume® as described fully later in this section.

On the 751R V2 Audyssey 2EQ offers two ways of measuring: The simpler

Audyssey autosetup method and Audyssey autosetup + 2EQ.

Audyssey autosetup uses the measurement from one position to perform the

speaker settings only.

Audyssey autosetup + 2EQ uses the measurement from 3 positions to

correct room response in addition to the speaker settings.

Before using either function, make sure to connect and correctly position all

of your speakers.

If rather than a standard 5.1 or 7.1 setup you are bi-amping your front

speakers or using the SBL/SBR speakers for Zone 2 or wish to run a 5.1+

Height conguration be sure to make these settings rst before then running

autosetup.

This is important as the 751R V2 needs this information in order to test the

speakers correctly during the autosetup process.

Performing autosetup

The simplest Audyssey based autosetup system is a two stage process, rstly

it checks how many speakers you have connected and reports whether they

appear out of phase or not. This allows you to trap any errors in connection.

If all is well you can then progress to the second stage which makes further

measurements of each speaker in turn to automatically set the distance

(delay time), calibrated level and crossover point for each one.

Cambridge Audio Azur 751R V2 Seite 17

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