Cambridge Audio 540D V2 Audio Setup menu, Dolby Digital Setup menus, Hdmi Audio, Dynamic

Audio Setup menu continued

HDMI Audio

Two options are available PCM Stereo and Follow SPDIF.

When HDMI Audio is set to PCM stereo the HDMI output will be 16/44.1 for CDs and 16/48 or 16/96 stereo/stereo downmix for DVD depending on the soundtrack bit depth.

When the 540D V2 is connected directly to a TV set able to receive Stereo Audio over HDMI PCM Stereo is the best setting to use. Your TV set will now always receive a two channel downmix from CDs or DVDs.

When HDMI Audio is set to Follow SPDIF the HDMI output will exactly follow the SPDIF output as per the previous section and table.

When the 540D V2 is connected to an AV receiver by HDMI there are two possibilities depending whether the receiver accepts HDMI audio directly or switches HDMI video and uses SPDIF for digtial audio reception:

1.For AV receivers that can receive HDMI audio set the HDMI Output to Follow SPDIF. Now set the SPDIF Output to RAW/Bitstream. The AV Receiver can now decode the bitstream over HDMI into whichever formats it supports. The TV itself will normally now not receive any audio (unless the receiver has the capability of making a stereo downmix and outputting it over HDMI).

2.For AV receivers that switch HDMI and use SPDIF for audio reception (such as our own Azur 540R V3 and 640R) set the HDMI output to PCM Stereo and SPDIF Output to RAW/Bitstream. The AV receiver now receives and decodes surround-sound via the SPDIF connection. The TV will always also receive a two channel downmix directly from the DVD player over HDMI which can be used if desired.

Pro Logic II

The 540D V2 can decode Stereo soundtracks (that have been suitably encoded) into 5 channel surround-sound using Dolby Pro Logic II. Two modes are available (Music and Movie), optimised for the different Programme types.

To use Pro Logic II first turn it On and then select either Movie or Music mode depending on the programme type.

Note: Enabling Pro Logic II decoding disables Dolby Digital decoding as Pro Logic is used instead as you’d expect.

Dolby Digital Setup menus

-- Dolby Digital Setup --

Dynamic

Channel Delay

	Go To Dolby Digital Setup
When the Dolby Digital setup menu is selected, use the		and
arrows	to move to the desired menu. Use the Navigation	arrows
(	) to adjust the settings and press the Enter button to confirm
your selection.

Dynamic

Dolby Digital encoded discs allow for the dynamic range (the difference between loud and quiet passages) to be compressed (i.e. for late night listening). The options are:

Full, 7/8, 3/4, 5/8, 1/2, 3/8, 1/4, 1/8, Off

When ‘Full’ is selected, the peak-to-peak value of the audio signal is compressed by the maximum amount. When ‘Off’ is selected, no compression is applied.

Channel Delay

For best surround-sound effects it is desirable to adjust the channel delay so that sounds from each speaker arrive at the listener at the same time. This is done by measuring the distance from the listening position to the Left or Right Front speaker (which should be equidistant from the listener), distance from the listening position to the Centre Speaker and similarly to the Right Rear Speaker, Left Rear Speaker and Subwoofer. See diagram below:

1

2	1	= Front Left & Right speakers
	2	= Centre speaker
5	3	= Surround Left speaker
	4	= Surround Right speaker
	5	= Subwoofer

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The measurements are not too critical so do not worry if your front speakers are slightly asymmetric or about making very precise measurements (+/- a foot or 30cm or so is fine).

The channel delay to be entered for each speaker is then the difference between the distance to the Front Speakers and the speaker to be configured.

So for instance if the Front Speakers are 5 ½ feet from the listener and the Centre speaker 3 feet from the listener the channel delay to be entered for the Centre Speaker is 2 ½ feet. Similarly if the Right Rear Surround is 3 ½ feet from the listener the channel delay would then be 2 feet.

Note: The distance between the surround speakers and the listener must be shorter than or equal to that between the front speakers and the listener.

The units are feet for units sold in North America / Canada and metres for units sold in Europe / Australasia.

Use	to select each speaker in turn and	to enter a distance
value.

The 540D V2 uses this to calculate and use the correct delay time for each channel so that each channel reaches the listener at the same moment.

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