Rotel RSX-1058 Owner's Manual download pdf (Page 43)

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We recommend starting with the settings for

all surround modes at the default 0dB setting

during the test tone calibration of the system

and for a period of familiarization after that.

As you listen to a variety of source material

over time, you may notice that certain sur-

round modes consistently produce too much

or too little bass from the subwoofer. If so,

then use these menu settings to customize

each surround mode. In general, if the master

subwoofer level is set properly (i.e. not too

loud), individual settings for each surround

mode should not be necessary.

NOTE: In Dolby Digital and DTS recordings,

the LFE channel is used to produce spectacu-

lar low bass effects, placing considerable de-

mands on your subwoofer system. If you hear

distortion or other signs of distress from your

subwoofer at loud listening levels, you may

consider reducing the subwoofer level for the

Dolby Digital and/or DTS surround modes. In

other surround modes, there is no LFE channel

and the subwoofer will only reproduce redi-

rected bass from the other channels, which is

not as likely to tax the subwoofer.

To return to the MAIN menu, press the EN-

TER button. Press the MENU/OSD button on

the remote to cancel the display and return

to normal operation.

Test Tone

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This menu uses ﬁltered pink noise test tones

to set equal volume levels for all speakers

(left front, center, right front, right surround,

center back, left surround, and subwoofer) to

ensure proper surround sound reproduction.

Setting the output levels using the test proce-

dure provides the most accurate adjustment

so that digital surround sound material will

be reproduced as it was intended and is a

critical step in calibrating the system.

NOTE: If you have conﬁgured your system to

use two center back speakers, there will be an

additional line in the menu, giving you the abil-

ity to independently adjust the CENTER BACK

1 and CENTER BACK 2 speakers.

To access this menu and perform the test

tone calibration, you can be in any surround

mode except BYPASS with any input except

the MULTI INPUT. Enter the OSD menu sys-

tem and select TEST TONE from the MAIN

MENU to reach this screen.

When you enter the TEST TONE menu, you

will hear a test tone coming from the high-

lighted speaker. Highlight different speakers

by moving the cursor to the desired line using

the UP/DOWN buttons. The test tone will shift

accordingly to the selected speaker.

Seated in the normal listening location, shift

the test tone to the various speakers. Using

the one speaker as a reference, listen for any

speakers that are noticeably louder or quieter.

If so, adjust that speaker’s levels up or down

(in 1dB increments) using the +/– buttons.

Continue switching among the speakers and

adjusting until all are the same volume.

To return to the MAIN menu, press the EN-

TER button. Press the MENU/OSD button on

the remote to cancel the menu display and

return to normal operation.

Calibration with an SPL meter:

Calibrating the system with an SPL (Sound

Pressure Level) meter, rather than by ear, pro-

vides more precise results and improves the

system’s performance signiﬁcantly. Inexpen-

sive SPL meters are widely available and the

procedure is quick and easy.

Both Dolby and DTS specify a standard cal-

ibration level for all theaters to ensure that

soundtracks can be played at the volume level

intended by the director of the ﬁlm. This ref-

erence level should result in spoken dialog

played at a realistic level for normal speech

with the loudest peaks in any single channel

at about 105dB. The RSX-1058’s test tones

are generated at a precise level (-30dBFs)

relative to the loudest possible digitally re-

corded sound. At the Dolby or DTS reference

level, these test tones should produce a 75dB

reading on an SPL meter.

Set the meter to its 70dB dial setting with SLOW

response and C-weighting, held away from

your body at your listening position (mount-

ing the SPL meter on a camera tripod makes

this easier). You can point the SPL meter at

each speaker as it is being measured; how-

ever, positioning the meter in a ﬁxed position

pointing at the ceiling is easier and probably

produces more consistent results.

Increase the master volume control on the

RSX-1058 until the meter reads 75dB (+5dB

on the meter scale) when playing the test tone

through one of the front speakers. Then, use

the individual channel adjustments on the

TEST TONE menu to adjust each of the indi-

vidual speakers, including the subwoofer, to

the same 75dB on the SPL meter.

NOTE: Due to meter weighting curves and

room effects, the actual level of the subwoofer

may be slightly higher than you measure. To

compensate, Dolby suggests setting the sub-

woofer several dB lower when calibrating with

an SPL meter (i.e. set the subwoofer to read

72dB on the meter instead of 75dB). Ultimately,

the proper subwoofer level must be determined

by personal taste and some listeners prefer to

set it above 75dB for ﬁlm soundtracks. Exag-

gerated bass effects come at the expense of

proper blending with the main speakers and

place stress on the subwoofer and its ampliﬁer.

If you can localize bass from the subwoofer, the

subwoofer level may be too high. Music can

be useful for ﬁne-tuning the subwoofer level as

excessive bass is readily apparent. The proper

setting will generally work well for music and

movie soundtracks.

Remember the setting of the master volume

control used during this calibration. To play

a Dolby Digital or DTS soundtrack at the ref-

erence volume level, simply return to that vol-

ume setting. Note that most home theater lis-

teners ﬁnd this setting to be excessively loud.

Let your own ears be the judge for deciding

how loud to playback movie soundtracks and

adjust the master volume control according-

ly. Regardless of your listening levels, using

an SPL meter to calibrate equal levels for all

speakers in the system is recommended.

Delay Setup

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The DELAY SETUP menu, which is reached

from the MAIN menu, allows you to set the

delay for individual speakers. This ensures

that the sound from each speaker arrives si-

multaneously at the listening position, even

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Rotel RSX-1058 Owner's Manual Page 43

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