NAD T 765 owner manual Using an SPL Meter, Setting Speaker Levels at Test mode

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USING THE T 765 – SETUP MENU

Speaker Levels

Adjusting the relative balance of your system’s loudspeakers ensures that surround-sound recordings, whether music or film, will present the balance of effects, music, and dialog that the artists intended. Additionally, if your system incorporates a subwoofer it establishes a correct relationship between the volume of the subwoofer and the other speakers, and thus of low-frequencies (bass) to other sonic elements.

Using an SPL Meter

It is quite practical to perform the T 765 level setup routines “by ear,” and careful work will produce acceptably accurate results. However, the use of an inexpensive sound-pressure level (SPL) meter, such as Radio Shack part number 33-2050, makes this task easier, more accurate and more repeatable. Ownership of such a meter could prove a valuable audio tool. Your NAD audio specialist may be able to help you with temporary use of a meter.

The SPL meter should be placed at the primary listening position, at approximately the height of the seated listener’s head. A tripod is helpful but with a little duct tape almost anything — a pole lamp, music-stand, or ladder-backed chair, for example — can do as well. Just be sure that no large acoustically reflective surfaces obstruct or are near the microphone element.

Orient the meter with its microphone (usually at one end) pointing straight up toward the ceiling (not toward the speakers) and ensure that “C” weighting scale is selected. Set the meter to display 75 dB SPL. On Radio Shack meters, this necessitates either setting the meter to its 80 dB range and taking your readings at the -5 point or selecting the 70 dB range and reading at the +5 point.

Setting Speaker Levels at TEST mode

While at ‘Speaker Levels’ menu, press the HTR 3 remote’s ‘Test’ key activating the T 765’s Speaker Levels balancing test signal . You will hear a “surf” sound as you step through your speakers (‘test’ appears to the right side of the current speaker), beginning with the Front Left. If you do not hear the test signal, check your speaker connections or your ‘Speaker settings’ OSD menu settings.

Use the remote’skeys to adjust the loudness of the noise output from the currently playing channel to the required level (it’s usually simplest to begin with the Front Left). As you cycle the test signal around the speakers, the OSD will highlight the currently playing channel. The “level offset” reading on the right will change by 1 dB increments; ±12 dB adjustment is available. Press ‘ENTER’ to adjust the next speaker.

Note

If you are balancing levels “by ear”, choose one speaker—usually the center—as a reference and adjust each of the others in turn to “sound as loud” as the reference. Be sure that you remain in the primary listening position while balancing all channels.

To produce the same SPL meter reading (or subjective loudness), use the remote’skeys to adjust each speaker.

Note

•All speakers must be in their final locations before level-setting.

•Your subwoofer (if any) should be set with its integral crossover defeated, or if undefeatable, set to its highest-possible frequency if you are using the T 765's Subwoofer output. Final subwoofer-level adjustment “by-ear,” using music and film sound material, is frequently useful.

•Due to the effects of room acoustics, matched-pair speakers (front; surround; back) will not always calibrate to exactly the same level offset readings.

You can exit ‘Test’ mode at any time by pressingkey, bringing you back to ‘Speaker Setup’ menu. You can also press the ‘TEST’ key to discontinue the ‘Test’ mode.

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