The onboard audio system the A7N8X Deluxe utilizes has numerous capabilities, one of major preference is the DD 5.1 channel or AC-3 surround system. Most users will want take advantage of this if your speaker system supports it. So to address a few speaker settings with concern to the stereo mini-jacks and S/PDIF located on the rear panel or I/O panel a brief description as follows:

There are 5 color coded mini-jacks and 1 S/PDIF on the I/O panel- listed below are the correct positions:

yellow- Left+ Right Front Speaker

purple- Left + Right Rear Speakers

pink- Microphone

green- Center and Sub-woofer* (your set-up may require the use of the below -downloadable utility)

blue- Line-In

S/PDIF- Digital Out or In (adjusted from the NVidia Audio Panel with in Windows, can only be used one way In or Out not both)

Dolby Surround Encoding:
Enables audio to be encoded for playback on home theater receivers (using analog stereo outputs only)

Dolby Digital Encoding:
Enables audio to be encoded for playback on 5.1 home theater receivers (using digital S/PDIF output only)

Note: Dolby Digital IS available via software implementation with respect for DVD this will vary depending on your speaker set-up and your DVD software. (see page 87 of your manual)

  1. Create Center Channel
    Generates a center channel for audio content that does not have it natively (like MP3s, WMAs, etc.)

  2. Create Channel 3D Pan
    Allows game sounds to be panned through the center speaker when they pass between the left and right speakers (only works for DirectSound3D games)

  3. Create LFE Channel
    Generates a subwoofer signal for speaker systems that require it (like Dolby Digital receivers or home theaters with discreet subwoofer inputs)

  4. Rear Speaker Phase Shift
    Adjusts the output of the rear speakers so that sounds don't 'cancel out' and remove the bass channel or cause a 'tinny' sound (primarily older 4 channel PC speakers systems)

  5. LFE Crossover Frequency
    Adjusts the amount of bass signal removed from the main speakers and sent specifically to the subwoofer output (increments in hertz)

   This is NVida's explanation of the APU

At its core, the Audio Processing Unit is a multi-processor audio rendering engine

The APU is responsible for providing hardware audio acceleration for

both output streams (playback) and input streams (record). The APU renders

completely to system memory. This decoupling allows the resulting stream to be

transferred to any transducer including an AC ‘97 CODEC or a USB speaker


The APU is divided into four main sections:

  • Setup Engine

This unit is responsible for performing all data and parameter setup for the

other processors. All memory management, mapping and DMA resources are

controlled in this unit.

This unit contains several fixed function digital signal processing (DSP) units

responsible for processing voices and mixing the results in the mixer buffers.

This unit is built around a programmable DSP. The DSP is responsible for

adding varied effects to the data in the mixer buffers and producing the final

output stream to the OS.

This unit is built around a programmable DSP, which is responsible for

encoding Dolby Digital (AC-3) data that’ll be sent over the S/PDIF to an

external consumer decoder. This allows 5.1 speakers (left front, right front,

center, right rear, left rear, sub-woofer) to be transmitted over a digital


Depending on how you decide to use the NForce audio system, you may use either digital or analog outputs/inputs. Also remember, the NForce technically has five audio decoding devices, 3 digital (3-sets of programmable outputs- AC-3) and 2 analog (Stereo)- the NForce APU (audio processing unit) uses the Realtek Decoder. As well, you have many different user defined parameters available such as user definable sound fields, an EQ, Effects, and many others. These can be all be implemented for various simulated sound effects.

A few quick words about DVD players and your NForce audio system. Depending on the DVD software your using, you may have to enable digital audio extraction from the Optical drive properties tab located with-in Windows, it is advisable to do this before you install any DVD software. It is also best to use DAE because it extracts data at a much higher sampling rate than the analog speaker cable from your perspective drive(s). Not to mention, I feel it sounds much better. DMA must also be enabled for most DVD players and CD-RW's to perform correctly.

Auditgy owners- (or others) make sure you disable the onboard sound BEFORE  you install the O/S or any drivers. When you install the NForce drivers you will have to install them to a folder you create first, then you must select the appropriate driver from the folder you have created. It is best to do this for any NForce driver package.

Audio Utility*- I have provided a link to the NVswap utility for users with 5.1 sound systems. If your not already familiar with this utility, it allows a user to "swap" the Center and Sub channels around so they match your speaker set up. And thus solving the problem of "my center channel doesn't work" Get it here. (direct from my site)

Most users will be able to use the audio output jacks as they were intended, not as the Asus manual suggest. (using the mic and line out jacks)