Cambridge Audio Azur 340R Bedienungsanleitung PDF herunterladen (Seite 13)

340Razur

ENGLISH

Because the speakers in a surround sound system are usually different

distances from the listener the 340R incorporates the ability to apply a

variable digital delay to each of the channels so that the sound from

each arrives at the same time at the listening position for best surround-

sound effect. Each pair of speakers (i.e. Front Left and Right or Surround

Left and Right) are subject to the same delay and so must be situated

equidistant from the listener.

To set the delay times simply measure the distances from the listening

position to each speaker as shown in the following diagram:

Note: No delay setting for the subwoofer is necessary.

Set the distances in the OSD Speaker Delay menu to the nearest value

in metres (1 foot = 0.3 metres). The speed of sound is approx 340

metres per second, the 340R thus introduces approx 3mS of delay per

metre of distance set.

Go to the ‘Speaker Delay Menu’ and highlight each speaker in turn. Set

the distance to the nearest value to that which you measured by using

the Left and Right arrows (the values do not need to be exact):

Press the OSD button to exit the menu.

Note: In addition to the delays as set above Dolby Pro Logic II playback

also requires an extra 15 milliseconds delay to the surround channels

only. This extra delay is part of the Dolby Pro Logic II specification and

ensures that sound from the surrounds arrives just after sound from the

front reducing the audibility of sound leakage from the front to the

surround speakers. Because the relationship between the Dolby Digital

and Dolby Pro Logic II two delays is fixed (15mS extra to the surround

channels), it is only necessary to set the delay by measuring the

distances as we have described. The 340R will automatically provide the

appropriate extra delay whenever you switch to a Pro Logic Mode.

1 = Front Left & Right

speakers

2 = Centre speaker

3 = Surround Left & Right

speakers

2. Speaker delay

Speaker Delay Menu

FL/R : 30mS/10.20m

C : 30mS/10.20m

SL/R : 25mS/ 8.50m

[Unit : mS/meters]

Return To Menu : [OSD]

The 340R 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 through the ‘Level Calibration’ menu in the OSD.

The basic process is to listen to or measure with an 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 340R incorporates a Test Signal Generator (broad-band white noise)

to facilitate this.

Set the unit to a normal listening level or half maximum volume

approximately. 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:

A “rushing” or “hissy” sound should be heard, initially through the Front

Left Speaker.

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.

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 loudest channel etc. Once all

channels sound the same in terms of loudness, press the OSD button

again to save the settings and exit the menu.

3. Level calibration

Level Calibration

Test Signal : On

Front L : 0dB

Front R : 0dB

Surround L : 0dB

Surround R : 0dB

Centre : 0dB

Subwoofer : 0dB

Return To Menu : [OSD]

1 2 ... 8 9 10 11 12 13 14 15 16 17 18 ... 21 22

Kommentare zu diesen Handbüchern

Keine Kommentare

Cambridge Audio Azur 340R Bedienungsanleitung Seite 13

Kommentare zu diesen Handbüchern