™
INFINITY CLASSIA
CoMPACT POWERED SUBWOOFER
’
OWNER S GUIDE
PSW310W (120V)
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™
’
INFINITY CLASSIA PSW310W OWNER S GUIDE
Table of Contents
ii Important Safety Precautions
1
Unpacking the Subwoofer
1
Placement
2
Controls and Connections
3
System Connections
4
Operation
5
Room Adaptive Bass Optimization System (R.A.B.O.S.)
Contents of the R.A.B.O.S.Test CD
The R.A.B.O.S. Sound-Level Meter (RSLM)
RSLM Placement
6
6
6
7
Initial System-Level Setting
Setting the Subwoofer Test Level
Performing Low-Frequency Measurements
What Does a Parametric Equalizer Do?
Completing the R.A.B.O.S. Measurement Template
Using the Width Selector
7
7
9
9
10
11
11
14
15
Level
What You Measure,What to Do
Adjusting the R.A.B.O.S. Equalizer
Final System Balance
16 Maintenance and Service
17 R.A.B.O.S. Measurement Templates
19 Specifications
INFINITY CLASSIA PSW310W (120V)
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Here are several additional facts on installation that may prove
useful. It is generally believed by most audio authorities that low
frequencies (below 125Hz) are nondirectional and, therefore,
placement of a subwoofer within any listening room is not
critical.While in theory it is true that the larger wavelengths of
extremely low frequencies are basically nondirectional, the fact
is that, when installing a subwoofer within the limited confines
of a room, reflections, standing waves and absorptions generated
within the room will strongly influence the performance of any
subwoofer system.As a result, the specific location of the
subwoofer becomes important, and it is strongly recommended that
you experiment with placement before choosing a final location.
™
INFINITY CLASSIA PSW310W
The Infinity Classia PSW310W continues the legendary Infinity®
dedication to accurate sound reproduction.The patented Ceramic
Metal Matrix Diaphragm (CMMD®) drivers, high-powered amplifier
and proprietary Room Adaptive Bass Optimization System™
(R.A.B.O.S.™) technology, along with a rigid, well-braced
enclosure, combine to deliver uncompromised bass performance
in any stereo or multichannel home theater.
In addition, the PSW310W’s compact enclosure and
wireless capability allow for easy integration into any
residential environment.
Placement will depend upon your room and the amount and
quality of bass required (for example, whether or not your room
permits placement of the subwoofer near either satellite).
UNPACKING THE SUBWOOFER
SUB
If you suspect damage from transit, report it immediately to your
dealer. Keep the shipping carton and packing materials for
future use.
RIGHT-
CHANNEL
SPEAKER
Included
1 x Owner’s manual
1 x USA warranty sheet
1 x Subwoofer
1 x 15' (4.5m) Audio cable, RCA-RCA
4 x Spiked feet
1 x Transmitter module
PRIMARY
LISTENING
AREA
1 x Power supply for transmitter
1 x 120V two-prong AC power cord for transmitter power supply
1 x 6' Audio cable, RCA-RCA
1 x Wall-mount bracket for transmitter
2 x With two panhead M3 x 4 machine screws for attaching
wall-mount bracket to transmitter
4 x Small, round, self-adhesive feet – to be attached on
transmitter’s left-side panel if transmitter is to be
used vertically
Figure 1.This example shows the subwoofer positioned behind
the right-channel satellite speaker to re-create the actual
location of bass instruments in an orchestra and/or add impact
to movie soundtracks.
INSTALLING SPIKED FEET
Four metal spikes are supplied for use when the subwoofer is to
be placed on a carpeted surface to decouple the subwoofer from
the floor and prevent unwanted damping.To insert the spikes, gently
lay the subwoofer on its back (not on its front or side) on a soft,
nonabrasive surface. Each spike screws into the threaded insert.
Make sure all four spikes are screwed in completely for stability.
PLACEMENT
Since the installation of a subwoofer can be somewhat more
complicated than installing full-range speakers, it is essential
that you read this section very carefully prior to connecting the
subwoofer to your system. Should you have questions relating to
your installation, it is advisable to call either your dealer or the
Infinity Customer Service Department for advice.
NEVER drag the subwoofer to move it,as this will damage the spikes,
the feet, the wood cabinet itself and/or the floor. Always lift the
subwoofer and carry it to its new location.
The performance of the subwoofer is directly related to its
placement in the listening room and how you align the subwoofer
with its satellite speakers.The PSW310W’s wireless capability
makes it even easier to properly locate the subwoofer in your
room. Setting the volume of the subwoofer in relation to the left
and right speakers is also of critical importance because it is
essential that the subwoofer integrate smoothly with the entire
system. Setting the subwoofer’s volume level too high will result
in an overpowering, boomy bass. Setting the volume level too low
will negate the benefits of the subwoofer.
1
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CONTROLS AND CONNECTIONS
Rear Panel
¡
™
£
¢
∞
§
¶
•
ª
‚
Power Switch
Line-Level Inputs
LFE Input
‚
Power Indicator LED
Low-Pass Selector
ID-Code Selector
⁄
On
Off
¤
Phase
Frequency
Antenna
ª
Level
C
Crossover Adjustment Control
Subwoofer-Level (Volume) Control
Phase Switch
Width
Level
•
D
Crossover
[Hz]
¶
Wireless Antenna
Room Adaptive Bass Optimization Controls (see page 5)
Wireless
§
A
Off
On
R.A.B.O.S. Selector
ID Code
∞
Low-Pass
LFE
¤
Green: Sub On
R.A.B.O.S. Center-Frequency Adjustment
Red: Standby
¢
Orange: Sub On and
Wireless Link Active
C
R.A.B.O.S. Bandwidth Adjustment
L
R
™
Sub In
£
D
R.A.B.O.S. Level Adjustment
Transmitter
PSW310W
E
Transmitter Antenna
F
Transmitter Power-Supply Input
G
Transmitter ID-Code Selector
H
Transmitter Sub Input
Power
On
¡
Off
AC 120V~60Hz
2A
ID
CODE
DC18V
Sub In
1
2
3
4
E
F
G
H
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SYSTEM CONNECTIONS
Choose either Wireless or Wired connection, then follow the appropriate instructions.
WIRED
WIRELESS
Connecting the Subwoofer for Wired Applications
Connecting the Subwoofer for Wireless Applications
If you have a Dolby® Digital or DTS® receiver/processor with
a low-frequency effects (LFE) or subwoofer output:
Level
Crossover
[Hz]
ID
CODE
DC18V
Sub In
1
2
3
4
Wireless
Off
O
n
ID Code
Low-Pass
Step 1.
Green: Sub On
Red: Standby
Connect a subwoofer cable from the subwoofer or LFE output of
Orange: Sub On and
Wireless Link Active
H
your receiver to the Sub In
on the transmitter.
L
R
LFE
Sub In
Line In
Step 2.
Plug the transmitter module into the wall outlet, and connect the
F
included power supply and power cord to the transmitter . Make
E
sure the Transmitter Antenna
is extended upward.
If your receiver/processor does not contain a Dolby Digital
or DTS processor but has subwoofer outputs:
Step 3.
G
§
Set the ID code on the transmitter and subwoofer ( and ) to
the same position, as described on page 4.When connected properly,
¢
the LED
on the rear of the subwoofer will be orange.
Step 4.
∞
Set the Low-Pass Selector
to the“Off”position.
Level
NOTE: Some receivers have two subwoofer outputs. In that case, use
either one of the connectors.
Crossover
[Hz]
Wireless
Off
On
Low-Pass
ID Code
Green: Sub On
Red: Standby
Orange: Sub On and
Wireless Link Active
L
R
LFE
Sub In
Line In
NOTE: If your receiver/processor has only one sub out, you
may use either the L or R input.
3
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OPERATION
Once you have a green or orange LED on the subwoofer, turn your
Power On
•
Subwoofer-Level Control up halfway so that the knob indicator
Connect your signal source (such as an A/V receiver or preamplifier)
to the transmitter (if using wireless connection) or to the subwoofer
(if using wired connection).Two single-RCA cords are provided.While
you would ordinarily use the short cable to connect to the transmitter
or the long one to connect to the subwoofer, either cable can be
used, depending on proximity to the signal source.There is no need
or benefit gained from connecting the same source to both the
transmitter and the subwoofer. However, you could connect two
separate sources to this subwoofer by utilizing both its wired and
wireless connections. Both signals will essentially be mixed and
outputted by the subwoofer. Plug your transmitter’s (if using wireless
connection) and subwoofer’s AC cord into a wall outlet. Do not use the
outlets on the back of the receiver for the subwoofer.
points up.You should now be hearing bass information coming from
the subwoofer.
Adjust Level
Set the overall volume control of the preamplifier or stereo to a
•
comfortable level.Adjust the Subwoofer-Level Control until you
obtain a pleasing blend of bass. Bass response should not overpower
the room but rather be adjusted so there is a harmonious blend across
the entire musical range. Many users have a tendency to set the
subwoofer volume too loud, adhering to the belief that a subwoofer
is there to produce lots of bass.This is not entirely true.A subwoofer
should enhance bass, extending the response of the entire system
so the bass can be felt as well as heard. However, overall balance
must be maintained or the music will not sound natural.An experienced
listener will set the volume of the subwoofer so its impact on bass
response is always there but is never obtrusive.
•
Initially set the Subwoofer-Level Control to the“Min”position.
¡
Turn on your sub by pressing the Power Switch on the rear panel.
Turn on your entire audio system and start a CD or movie soundtrack
at a moderate level.
Phase Control
Auto On/Standby
ª
The Phase Switch determines whether the subwoofer driver’s
Transmitter (wireless connection only):The Power Indicator LED
(not shown) will be lit in red when the unit is in standby.When the
transmitter receives an audio signal from the source, it will immediately
turn on and the LED will turn to blinking green or solid green:
piston-like action moves in and out with the main speakers, 0˚, or
opposite the main speakers, 180˚. Proper phase adjustment depends
on several variables such as room size, subwoofer placement and
listener position.Adjust the Phase Switch to maximize bass output
at the listening position.
ª
RED = STANDBY (No signal detected, transmitter off)
GREEN (BLINKING) = Transmitter is on but has not established a link
with the wireless sub.
GREEN (SOLID) = Transmitter is on and has already established a link
with the wireless sub.
Crossover Adjustment
The Crossover Adjustment Control determines the highest frequency
¶
at which the subwoofer reproduces sounds. If your main speakers can
comfortably reproduce some low-frequency sounds, set this control
to a lower frequency setting, between 50Hz and 100Hz.This will
concentrate the subwoofer’s efforts on the ultradeep bass sounds required
by today’s films and music. If you are using smaller bookshelf speakers
that do not extend to the lower bass frequencies, set the Crossover
The transmitter will automatically enter Standby mode after approximately
10 minutes when no signal is detected from your system.
Subwoofer:With the Power Switch ¡ in the“On”position, the Power
Indicator LED ¢ on the back panel will remain lit to indicate the
On/Standby mode of the subwoofer.
¶
Adjustment Control to a higher setting, between 120Hz and 150Hz.
RED = STANDBY (No signal detected, amp off)
NOTE: This control will have no effect if the LFE Input £ is used
GREEN = SUB ON (Wired signal detected, amp on)
ORANGE = SUB ON (Wireless link with transmitter active)
∞
(wired connection) or if the Low-Pass Selector is in the“OFF”position
(wireless connection). If you have a Dolby Digital or DTS processor/
receiver, the low-pass frequency is set by the processor/receiver. Consult
your owner’s manual to learn how to view or change this setting.
The subwoofer will automatically enter Standby mode after
approximately 10 minutes when no signal is detected from your
system.The subwoofer will then power on instantly when a signal is
ID Codes
¡
detected. During periods of normal use, the Power Switch can be
In the unlikely event that you experience interference when operating
the system, or if you have more than one set of subwoofer transmitters
and receivers in operation, you may change the channel in which the
system operates. On the transmitter module and the subwoofer, there is
¡
left on.You may turn off the Power Switch for extended periods of
nonoperation, e.g., when you are away on vacation.
Getting Started
G
§
a four-position ID-Code Selector ( and ). Simply set the selectors
Confirm that the Status LED on the transmitter (not shown) is on (red
G
§
)
to one of the other positions.The transmitter and subwoofer ( and
¢
or green) and the Status (Power Indicator) LED on the subwoofer
selectors must be set to the same position for the system to function
correctly.You can also set up a maximum of two subwoofers to be
receiving from the same transmitter by setting the channel selector
on the transmitter and both of the subwoofers to the same channel.
is on (red, orange or green) and that an RCA cable is connected
£
from a source unit to either the LFE Input of the subwoofer or
H
™
transmitter or L and R inputs on the subwoofer. Play a CD or
video. Use a selection that has ample bass information. If using a
wireless connection, the Status LED on the transmitter should be lit
A Word About Wireless Products
The Infinity Classia PSW310W wireless subwoofer utilizes advanced
wireless transceivers operating in the 2.4GHz frequency band.This is
the same frequency band that is used for wireless home networks and
high-quality cordless phones. It also allows for the transmission of high-
performance, full-spectrum sound to remote locations, wirelessly.
¢
in solid green, and the Status LED on the subwoofer should turn
orange if connected wirelessly. If the LED on the transmitter is blinking
in green and the LED on the subwoofer is in red or green, a wireless
link has not been established between the transmitter and the
subwoofer. If connecting directly to the subwoofer without using the
¢
wireless link, the Status LED on the subwoofer should be lit green.
If the LED on the subwoofer remains red, check that the RCA cable from
the source to the subwoofer (wired connection) or transmitter (wireless
connection) is functioning properly (wired connection) and that it is
Like all wireless devices, the Infinity PSW310W wireless subwoofer’s
operating range may vary, depending upon variables such as building
construction methods and materials, atmospheric conditions and other
sources of interference. Please consult your Infinity dealer or distributor,
G
fully inserted at both ends, or that the Transmitter ID-Code Selector
§
and the Subwoofer ID-Code Selector are set to the same channel.
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Wall-Mounting the Transmitter Module
NOTE: The customer is responsible for the correct selection and
use of mounting hardware (available through hardware stores) that
will ensure the proper and safe wall-mounting of the transmitter.
The R.A.B.O.S. Goal
It is a fact of audio that what we hear at low frequencies is
determined as much or more by the listening room than by the
loudspeaker itself. Placement of the loudspeakers and listeners
and the acoustical characteristics of the room surfaces are all
important determinants of bass quantity and quality. In most
practical situations, there is little that can be done about this,
except for patient trial-and-error repositioning of the loud-
speakers and listeners. Usually, the practical constraints
of a living space and the impracticality of massive acoustical
treatment mean that equalization is the only practical solution.
Step 1.
Insert the two M3 x 4 machine screws through the wall bracket and
into the rear of the transmitter module, as shown in the figure below.
Step 2.
Attach the transmitter module with wall bracket to the wall,
using suitable hardware and, if necessary, wall anchors.
Professional sound engineers routinely employ sophisticated
measurement systems and equalizers to optimize speakers to
the installation.This has never been practical for the home
audiophile.This is why R.A.B.O.S. technology was created. It
enables you to identify the dominant low-frequency response
characteristic of your room. Once you know the problem, the
R.A.B.O.S. system provides the tools needed to optimize the
low-frequency characteristics of the speakers to the room they
are in, exactly as the professional sound engineers do it.
Performing R.A.B.O.S.Tests
These instructions assume you have already installed your subwoofer
according to the information provided in the owner’s guide. It is
also assumed that all equipment in your entertainment system is
interconnected properly and is in good operating condition.
ROOM ADAPTIVE BASS OPTIMIZATION SYSTEM™
Preparations
™
Before beginning R.A.B.O.S. tests, please check the following:
The Infinity R.A.B.O.S. technology is a simple-to-use, yet
⁄
sophisticated, low-frequency calibration system. It is designed
to work in conjunction with the Infinity Classia PSW310W
powered sub.The subwoofer contains a parametric equalizer
that you will adjust as indicated by the R.A.B.O.S. test results.
By following these instructions, you will optimize the subwoofer’s
response characteristics to complement the sub’s environment.
This will dramatically improve the sound of your system.The
optimization process takes less than 30 minutes.
• Set R.A.B.O.S. System Selector
• Make sure all three R.A.B.O.S. controls (
on the subwoofer are turned fully clockwise.
to the“On”position.
¤ C
,
D
and
)
• Make sure the loudness contour (if any) on your receiver/
processor/preamp is turned off.
• Set the tone controls (Bass and Treble) to their center or
flat positions.
• Bypass all surround and effects features of your receiver/
processor/preamp or set to“Stereo Bypass.”
• If you are using a multichannel surround processor or receiver,
make sure all bass-management features are properly set.The
Audio channels should all be set to“Small”or“High-Pass” and
the subwoofer set to“On.”
The Optional R.A.B.O.S. Kit Includes
the Following Components:
• Specialized Sound-Level Meter
• Test CD
• Instructions
• Measurement Templates
• Width Selector
You must have a CD player in the system.A CD player remote
control is quite convenient but not essential.
For best results, it is recommended that all major furnishings are in
place and that all doors and windows in the listening area are in
their normal positions.That is, if you normally listen to music with all
doors closed, then this is how they should be during this procedure.
• Adjustment“Key”
What R.A.B.O.S.Technology Does
The Test CD provides specially designed signals you will use
while performing measurements.The sound-level meter provided
is used to“acquire”the information needed for adjustments.
You will create a response plot on the R.A.B.O.S. Measurement
Template. Using the Width Selector, you will then determine the
appropriate equalizer settings.The Adjustment“Key”is used to
adjust the parametric equalizer built into the PSW310W.After
adjustment, the test sequence is repeated to confirm your settings.
Try to minimize ambient noise while running tests.Turn off all major
appliances and any air conditioning or furnace fans.These can
create significant subsonic noise that may be barely perceptible but
which can wreak havoc on low-frequency measurements.
Critical information is highlighted with this mark:
Helpful hints are marked with this symbol:
5
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Contents of the R.A.B.O.S. Test CD
Power is switched on or off by pressing the button directly below
the bar-graph window.When the unit is on, one or more LEDs will
always be illuminated.The function of the LEDs is described in
the following section.
Track Title
Track Title
Quick Retest 80Hz
1
Welcome
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
2
3
4
5
6
7
8
9
Set System Test Level
Set Subwoofer Test Level
100Hz Test
95Hz Test
90Hz Test
85Hz Test
80Hz Test
77Hz Test
72Hz Test
66Hz Test
63Hz Test
56Hz Test
52Hz Test
49Hz Test
46Hz Test
43Hz Test
40Hz Test
38Hz Test
35Hz Test
30Hz Test
26Hz Test
24Hz Test
22Hz Test
21Hz Test
20Hz Test
Intro to Quick Retest
Quick Retest 100Hz
Quick Retest 95Hz
Quick Retest 90Hz
Quick Retest 85Hz
Quick Retest 77Hz
Quick Retest 72Hz
Quick Retest 66Hz
Quick Retest 63Hz
Quick Retest 56Hz
Quick Retest 52Hz
Quick Retest 49Hz
Quick Retest 46Hz
Quick Retest 43Hz
Quick Retest 40Hz
Quick Retest 38Hz
Quick Retest 35Hz
Quick Retest 30Hz
Quick Retest 26Hz
Quick Retest 24Hz
Quick Retest 22Hz
0dB
-1
-2
0dB
-1
-2
0dB
-1
-2
0dB
-1
-2
-3
-4
-3
-4
-3
-4
-3
-4
-5
-6
-5
-6
-5
-6
-5
-6
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
-7
-8
-7
-8
-7
-8
-7
-8
-9
-9
-9
-9
-10
-12
-14
-16
ON
Batt
-10
-12
-14
-16
ON
Batt
-10
-12
-14
-16
ON
Batt
-10
-12
-14
-16
ON
Batt
Quick Retest 21Hz
Quick Retest 20Hz
Final System-Level Adjustment
Final Subwoofer-Level Adjustment
Wide Band Pink Noise, Left
Wide Band Pink Noise, L+R
Wide Band Pink Noise, Right
Wide Band Pink Noise, L-R
Wide Band Pink Noise, Uncorrelated
1 to 4kHz Pink Noise, Left
1 to 4kHz Pink Noise, L+R
1 to 4kHz Pink Noise, Right
1 to 4kHz Pink Noise, Left-R
1 to 4kHz Pink Noise, Uncorrelated
Low
Battery
Over-Range
Measurement
In-Range
On
Under-Range
Figure 3. RSLM bar-graph indications
• Power-On/Low Signal: This is indicated by the illumination of
any LED on the bar graph. If the sound level in the room is
below the measurement range of the instrument, a green LED
near the bottom of the bar graph will be illuminated.
• Normal Measurements:When the sound level is within the
range of the RSLM, the green LED will be off and one of the
red LEDs in the bar graph will be illuminated, indicating the
relative sound level, in decibels (dB).
Tracks 53–62 of the R.A.B.O.S.Test CD are test tones that can be
used for general diagnostics of your system.They are not used for
R.A.B.O.S. settings.
• Over-Range: If the sound level exceeds the range of the meter,
0dB through –5dB will all light simultaneously.
• Low Battery:When the battery voltage is too low for accurate
measurements, an LED at the bottom of the bar graph will be
illuminated. Replace the battery.
THE R.A.B.O.S. SOUND-LEVEL METER (RSLM)
The RSLM is a battery-operated, handheld, acoustic measurement
device specifically designed for the Infinity R.A.B.O.S. system. On the
face of the instrument is a light-emitting diode (LED) bar graph that
indicates relative sound level.There are also indicators for power-on,
out-of-range signals and a low battery.
Do not attempt measurements when the Low Battery light is on.
RSLM Placement
Determine where in the room you are most likely to sit when
listening to music or watching a movie.This is where you will
want to hold the RSLM during measurements.The RSLM should
be oriented so it can be easily read and held at your seated
ear level during tests.
-1
-2
-3
-4
-5
-6
-7
-8
-9
-10
-11
-13
-15
-18
You must use this same position for all tests.
U-R
Batt
The RSLM can be mounted on a standard camera tripod.
This will ensure the best results.
Power
Figure 2. R.A.B.O.S. Sound-Level Meter
INFINITY CLASSIA PSW310W (120V)
6
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sound bad; they can cause measurement errors. If you hear a
buzz or rattle during this test, it is highly recommended that you
locate the source and eliminate its effects.This is actually a
valuable room-diagnostic tool.
Initial System-Level Setting
The following steps will set the playback level of the system to
the correct level for all tests that follow.
Turn the system volume to minimum.
Press Play
›.As Track 3 plays, watch the RSLM carefully.Watch
for peak readings.The peak reading may be no more than a brief
Cue the R.A.B.O.S.Test CD to Track 2 and press Pause II.This
track will produce band-limited pink noise in both the left and
right channels.
•
flash. Readjust the subwoofer’s Subwoofer-Level Control
until
the peak level observed is 0dB without triggering the over-range
indication. See Figure 5.
Press Play ›. With the RSLM positioned as described above,
increase the system volume until the RSLM display indicates –10dB.
See Figure 4.
0dB
-1
-2
-3
-4
-5
-6
-7
-8
-9
-10
-12
-14
-16
ON
0dB
-1
-2
-3
-4
-5
-6
-7
-8
-9
-10
-12
-14
-16
ON
0dB
-1
-2
-3
-4
-5
-6
-7
-8
-9
-10
-12
-14
-16
ON
0dB
-1
-2
-3
-4
-5
-6
-7
-8
ꢀ ꢀ
-9
-10
-12
-14
Batt
Batt
Batt
-16
ON
Batt
Figure 4. RSLM indicating the
correct system level to
begin tests (–10dB)
Too High
Correct
Level
Too Low
Figure 5.Adjusting the subwoofer levels for a 0dB peak
When you have completed this adjustment, press Pause II.
When finished, press Pause II.
Setting the Subwoofer Test Level
Performing Low-Frequency Measurements
Each of the following test tracks is about one minute
long.This is normally much longer than required. Press Pause II
or advance to the next test as soon as you are ready.
Read the following instructions fully before beginning tests.
For the following steps, you will need a R.A.B.O.S. Measurement
Template and a pencil.
This step will set the subwoofer levels for measurement
purposes.The objective is to scale the subwoofer’s output to
make full use of the RSLM indicator range. Scaling is optimum
when a 0dB reading is observed on the highest peak without
triggering the over-range indication. Later, you will rebalance
the subwoofer to the main speakers.
¤ C
,
D
and , should be
The three R.A.B.O.S. controls,
set to fully clockwise positions, and all measurements should be
conducted with their level controls in this position. Confirm this
•
setting before you begin this test.The Subwoofer-Level Control
should be set to the mid position.
Cue Track 3 and Pause II.Track 3 continuously steps through all
subwoofer test tones for approximately one minute. Each tone will
play just long enough for the RSLM to give a stable reading.
To get accurate measurements, it is necessary to play
the subwoofer quite loud.The 0dB indication is about 94dB.At
this level, frequencies below 100Hz can cause doors, windows,
furnishings and other objects in the room to vibrate.This
frequently results in clearly audible buzzes and/or rattles that
come and go as each test tone plays. Strong buzzes not only
Figure 6. R.A.B.O.S. Measurement Template
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››
Each of the following tracks produces a low-frequency test
tone.The range of these tests is from 100Hz down to 20Hz.The
frequency of each test is announced before it begins.The first
test is the highest frequency (100Hz); therefore, you will be
marking the template from right to left. Each frequency point is
listed across the bottom of the R.A.B.O.S. Measurement Template
(this is called the X-axis). See Figure 6 on the previous page.
The vertical scale on the left side of the template indicates
relative level, in dBs (the Y-axis).The template’s vertical scale
matches that of the RSLM bar graph.
When finished, press Skip
I to advance to the next test. Repeat
the process described above for Tracks 5 through 26.
When you have completed the 23 measurements, you are ready to
analyze the data and make corrective adjustments.The completed
R.A.B.O.S. Measurement Template will look something like the
example in Figure 9.
Cue Track 4 and Pause II.
From now on, you will want to keep your CD player’s
remote control handy.
›
Press Play . As Track 4 plays, observe the level indicated on
the RSLM.
EXAMPLE:The test frequency is 100Hz and the level indicated is
–2dB. Find the intersection of 100Hz (X-axis) and –2dB (Y-axis).
Place a dot at that point. See Figure 7.
Figure 9. Completed R.A.B.O.S. template
Now connect the dots as shown in Figure 10.This will make
interpretation of the data much easier.
Figure 7. Locating a test point
It takes a few seconds for the RSLM reading to stabilize,
especially at very low frequencies. Don’t rush. Give each test
adequate time for the meter to stabilize.
At the bottom of the bar graph is a green“On”LED.This LED is
illuminated whenever the sound level is below the measuring
range of the RSLM. If this occurs during a test, place a dot at
the intersection of the test frequency and the bottom frame of
the template. See Figure 8.
Figure 10.Test example with dots connected
2
Figure 8. Indicating an under-range test
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At this point, you may simply enter the data you just
measured into the R.A.B.O.S. calculator, found on the
Width
The frequency range of the R.A.B.O.S. equalizer may be set from
5% to 50% of an octave in 21 steps.This setting defines how
much of the PSW310W’s output will be equalized.
STOP
entering the data, this R.A.B.O.S. wizard will return the correct
¤ C
,
D
settings for all three R.A.B.O.S. controls:
and . Skip
to page 14 and adjust these controls as described, and finish
the R.A.B.O.S. setup. If you would like to manually calculate the
R.A.B.O.S. settings, simply continue following the instructions
from this point.
What Does a Parametric Equalizer Do?
The R.A.B.O.S. system uses one band of parametric equalization
for response correction. Parametric equalizers are the most
versatile class of filters.The effect an equalizer will have on the
signal is dependent on three parameters.
Frequency: The equalizer will have maximum effect at one
frequency, usually described as the center frequency.
Level: This refers to the amount of cut (in dBs) for which the
equalizer is set.
Figure 11. Effect of adjustable width
Bandwidth: Defines the range of frequencies over which the
equalizer will have an effect. On the PSW310W, this adjustment
is abbreviated as“Width.”
Width is expressed as a percentage of an octave. For example, a
width setting of 25% means the equalizer will affect a frequency
band of 1/4 of an octave; 1/8 of an octave above and 1/8 of an
octave below the center frequency.
Only parametric equalizers allow independent adjustment of all
three parameters.
The octave is a logarithmic expression. From any point
in the spectrum, one octave above or below that point is always
double or half the frequency.Therefore, one octave above 100Hz
would be 200Hz. One octave below 100Hz is 50Hz.
These will be explained more fully in the sections that follow.
Completing the R.A.B.O.S. Measurement Template
Along the bottom of the R.A.B.O.S. Measurement Template are
three fields where you will enter the equalizer settings needed to
complete system optimization.
In the section that follows, we will discuss the use of the
Width Selector.
These instructions are based on the example in Figure 11. Use
this tutorial to become familiar with the process. Strategies for
several other test results will be presented later.After you have
completed these three entry fields, you will be ready to perform
the adjustments, completing R.A.B.O.S. optimization.
Frequency
The frequency of the R.A.B.O.S. equalizer may be adjusted to
any one of nineteen frequencies from 20Hz to 80Hz.This defines
where you are going to apply equalization.
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