M-Audio Studiophile SBX User Manual

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Studiophile SBX

Users Manual

Your Your Studiophile SBX . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2

First Things First . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3

In the Box . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3

Correct Power Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3

Positioning the Subwoofer in the Studio . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3

Rear Panel Features: . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4

Connecting the SBX and Your Main Speakers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .6

Using the SBX with Stereo Bass Management . . . . . . . . . . . . . . . . . . . . . . . . . .6

Using the SBX without Stereo Bass Management . . . . . . . . . . . . . . . . . . . . . . . .7

Connecting an Additional Subwoofer . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .8

Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .8

Power Modes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .8

Setting the HPF Bypass Switch . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .8

Optimizing the Rear Panel Settings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .9

Setting the Level Control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .9

Setting the Phase Control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .9

Setting the Subwoofer LPF and the Satellites HPF . . . . . . . . . . . . . . . . . . . . . . .10

Troubleshooting & Technical Support . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .12

Avoiding Problems with Turntables . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .12

Replacing the Fuse . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .13

Support . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .13

Warranty Information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .13

Contact Information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .14

Technical Specs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .15

The SBX is a high-quality subwoofer designed to deliver extremely low

Your Studiop

ile SBX

 

 

 

frequ

ncies in conj nction with stereo pairs of studio reference monitors such

as the M-Audio

Studiophile BX8 or BX5. In fact, so many consumers have

subwoofers in their home and car entertainment systems that you’re not really

mixing accurately without having a sub yourself.

 

 

 

M-Audio’s engineers designed the SBX to meet professional q ality

performance standards and to provide superior value. Your SBX is constructed

using high-quality components such as the 8-inch mineral filled polypropylene

woofer cone. We use only selected grade components throughout the circuit

design, placing special emphasis on components within the audio path to

assure stable, consistent performance. We’ve built in a unique smooth-clipping

circuit to deliver

warm musical sound similar to a vacuum tube. This circuit

also provides overload protection for safe and high volume performance.

The SBX incorporates a unique Stereo Bass Management System. When

subwoofers are added to many systems, all frequencies are routed

both the

main monitors and the sub. The problem is that both the main monitors and

the sub are still trying to put out the same low frequencies, duplicating the

playback of some of the low frequencies and thereby compromising

monitoring accuracy.

 

 

 

Our Stereo Bass Management System solves that and delivers optimal fidelity.

The SBX’s internal crossover network splits the signal

at

user-defined

crossover frequency, routing everything below it to the

internal

sub and

everything above it to the main outputs. This significantly improves fidelity

because the sub and mains aren’t tripping over each other to reproduce the

same frequency—and each component only has to reproduce frequencies to

which it is ideally suited.

 

 

 

subwoofer on when it senses a program signal while turning it off to conserve

Your SBX also features auto-muting circuitry that automatically turns the

ower when no signal is present. Various controls also allow you to adjust

performance of the SBX in conjunction with the rest of your system. While the

this manual in order to derive optimal audio quality from your new

SBX

easy to operate, we sugg st that you take few minutes to read the rest

subwoofer. Enjoy!

 

 

 

2

InFirstorderThingsto avoidFirstrisk of damage and insure optimum performance from your SBX Subwoofer, please take time to read this manual before you proceed to unpack and install it.

InCarefullythe Boxremove the SBX from the carton, paying extra attention to avoid touching or damaging the speaker cone. If the system is damaged in any way or does not contain all parts, contact your dealer immediately. We recommend that you savethe the carton in the event that you need to transport or ship the product in future. Within the SBX package you should find:

SBX Subwoofer

Theis manual

One (1) standard AC Power cable

Correct Power Operati

 

Since the SBX contains its own amplifier, it must be connected to a power outlet

using the det chable AC cable provided. Before

power, please

panel is set to the appropriate position, as describedconnectingthe rear-panel features

make sure that the Voltage-Select Switch, located

the the speakers rear

list appearing earlier in this manual.

 

Note: - WARNING! - Use of improper voltage/ selector switch

combinations may result in hazardous conditions and/or damage to

speaker components not covered by speaker warranty.

Positi ning the Subwo fer in the Studio

 

In theory the best position for the SBX subwoofer is midway between

satellite speakers, with its front facing forward and in the same plane as the

onts of the satellite speakers. However, due to the fact that low bass

equencies are somewhat non-directional, you may locate the SBX quite far

from this position without any detrimental effect on the sound reproduction.

Each room is different in ac ustic properties, so please feel free to experiment

with placement. Different positions of the SBX

to walls will affect its

efficiency, as well as the room’s overall influencerelationthe frequency response. You can compensate for this by readjusting the filter settings (see section, “Setting the Subwoofer LPF and the Satellites HPF”).

3

1.

Power Mode LED: This LED indicates the power status. If the

-muting

Rear Panel Features:

 

 

 

 

circuitry is engaged, this LED will be amber if there is no audio signalautothe SBX,

 

and green when the SBX receives a signal. If “Auto-Power” is switched off, then

 

this LED will remain green.

 

 

 

2.

“Level” control knob: This knob controls the amplifier level of the SBX. The gain

 

range is from minimum to maximum, labeled “Min” and “Max,” with Min being

 

full attenuation and Max being full volume.

 

 

3.

Phase control knob: This knob controls phase of the crossover frequencies of

 

the Subwoofer and the Satellites from 0 to 180 degrees.

 

4.

“Subwoofer” LPF control knob: This knob de ignates the cutoff frequency of the

 

SBX using LPF, or low-pass filter. This

setting will determine

the highest

 

frequency that the SBX will reproduce.

 

 

5.

“Satellites” HPF control knob: This knob determines the HPF, or high-pass filter

 

cutoff frequency for the Satellite speakers while using the SBX’s Stereo Bass

 

Management System. The Satellites control knob is functional only when the

 

HPF Bypass switch is set to Off.

 

 

6.

Input section: This section provides two balanced XLR inputs and two 1/4” TRS

 

connectors that may be

for balanced (TRS) or unbalanced (TS) operation.

 

Either XLR or TRS may be used as your audio input. These inputs are designated

 

as “L” and “R” for operation in bass management mode. When bass

 

management is not used, either the L or R input may be used to input signal to

 

the SBX.

 

 

 

7.

Auto Power On/Off Switch: When this switch is set to “On,” Auto Power mode is

 

engaged. Switching to “Off” will defeat Auto Power mode.

 

8.

HPF Bypass switch: Switching HPF Bypass to “On” will bypass the Satellites HPF

 

control knob, effectively defeating the SBX’s Stereo Bass Management System.

 

With HPF Bypass switched off, the “Satellites” HPF cutoff frequency control knob

 

is engaged and bass management is operational.

 

9.

Output section: This section provides three balanced XLR outputs labeled “Extra

 

Sub” and “L” & “R.” The Extra Sub output gives you throughput directly from the

 

inputs for the purpose of connecting an additional subwoofer. The L and R

 

outputs are to be used for connecting Satellite speakers (your left and right

 

mains) when using the Bass

 

System.

 

0.

Power cable socket: This socketManagementaccepts standard grounded AC cable.

11. Fuse holder: This fuse holder allows the replacement of a fuse for the purpose

 

of circuit protection.

 

 

 

12.

Power On/Off switch: Switching to “O ” will power the SBX subwoofer.

 

Switching to “Off” will power the unit down.

 

 

13.

Manufacturer’s Label: This section gives the model number and manufacturer

 

information, including important power requirement information. See section,

 

“Correct Power Operation.”

 

 

 

14.

Voltage-Select Switch: Provides 2 selections - 115VAC (120VAC) and 230VAC,

 

and should be set to match the “house current” (receptacle) voltage of the

 

country/location in which the speaker is used. The 115V (120V) setting is correct

 

for the USA and the 230V setting correct for most of the UK and Europe.

 

 

 

 

 

 

 

4

 

 

5

Most applications will utilize the SBX’s internal Stereo Bass Management

C nnecting the SBX and Your Main Speakers

System to realize maximum benefit. There are, however, two possible

operational modes that you may use

connecting your SBX and your

M ins, or “Satellite” stereo speakers,when. ., 1) using the SBX with bass

management and 2) using the SBX without bass management.

Using the SBX with Stereo Bass Management

 

To take advantage of the SBX’s internal Stereo Bass Management System, your

monitors become satellites of the subwoofer. Connect

left and right

main or control room outputs of your mixer, sound card, or other audio source

o the Input-L and Input-R jacks of the SBX (#6) respectively. (You may use either

the XLR or TRS inputs, depending

your cabling needs.) Then, connect

Output-L and Output-R (#9) XLR jacksupon the SBX to the inputs on the left and right satellites.

Once you have completed this setup, you must set the Subwoofer LPF control knob and the Satellites HPF control knob for your particular needs. Please see thise section, “Optimizing the Rear Panel Settings” for information on how to do

. Also note that the HPF Bypass switch is set to “Off” this scenario.

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Using the SBX without Stereo Bass Management

You may wish to use the SBX with an existing external bass management

system, or with bass management defeated on the SBX. See section, “Setting

the HPF Bypass Switch” for more information on defeating bass management.

With bass management defeated, you may still use the speaker setup

illustrated

. With the HPF Bypass switch set to “On,” the L & R XLR Outputs

will operateabovein

“T ru” mode, passing the original signal at the Input section

directly through to the outputs. In this setup, you will want to set the Subwoofer LPF control knob to the desired cutoff frequency for the SBX. The Satellites HPF control knob is not operational with the HPF Bypass switch set to “On.”

If you are using an external bass management device, or if you have an auxiliary or subwoofer output send, you may wantdirectlyto onnect this directly to the SBX while connecting your main L & R outputs to your “Mains,” or stereo L & R speakers. In this instance, you may use either the Input-L or Input- R connections on the SBX.

Incutofhis frequencys tup, you will want to set the Subwoofer LPF control knob to the deisired f for the SBX. Once again, the Satellites HPF control knob not

operational with the HPF Bypass switch set to “On.”

7

Connecting an Additional Subwoofer

 

If you have a large monitoring environment requiring greater subwoofer sound

pressure, you can connect as many SBX

as desired in a daisy chain.

Simply connect the Extra Sub Outp t (locatedcabinetsthe Output section) the Input-L

or Input-R input of second SBX (you may use the Extra Sub Output to connect to

another brand of subwoofer). In this instance, you will ant to have the HPF

Bypass switch set to “On” on the second SBX subwoofer so that bass

management is not repeated in the second sub.

 

Operation

Power Modes

 

The SBX’s main Power switch (#12) must be switched “On” order for the SBX

to operate. The subwoofer is designed to operate continuously in Power “on”

mode. (The SBX uses less than 3 VA in power mode.)

When the Auto Power mode is engaged, in conjunction with Power “on”, the

subwoofer automatically becomes operational when a signal is present and

returns to Standby mode when a signal has not been detected for five minutes.

To operate in Auto Power mode, turn the Auto Power On/Off switch (#7) to the

“On” position. The Power mode LED (#1)

the current status of the Auto

Power circuit, glowing amber whenindicatesStandby and green when fully operational. When Auto Power is engaged, it is not necessary to turn the Power switch on or off each time you wish to use the SBX.

In special situations where you intend to play the system at very low volume or if Auto Power mode will not meet your application for any other reason, you can switch the Auto Poffwer On/Off switch to the “Off” position. When Auto Power Mode is turned you must turn the SBX on or off manually using the

switch.

If you intend not to use the system for a long period of time (such as a vacation),Note: it is advisable to manually turn the system off via the Power switch.

SettingIn normaltheoperation,HPF Bypassthe HPFSwitchBypass switch should be left in the “Off” position. When the HPF Bypass switch is in the Off position, the SBX Stereo Bass Management System is operatiofnal. In this case, the “Satellites” control knob, which sets the cutoff frequency the HPF, is also operational. the When you want to bypass the SBX Stereo Bass Management System, engage the HPF Bypass by switching it to the “On” position. This will defeat “Satellites” control knob and the HPF. 8

Optimizing the Rear Panel Settings

Level

Phase

Subwoofer

Satellites

 

 

 

100Hz

140Hz

100Hz

140Hz

 

 

80Hz

 

80Hz

 

There Minare fourMaxcontrol knobs180°on the50Hzrear of180Hzthe SBX:50Hz“Level,”180Hz“Phase,” “Subwoofer” LPF cutoff frequency, and “Satellites” HPF cutoff frequency. These combined controls make it possible to optimally match the low thesebass frequencies from the subwoofer to your unique combination of satelliteWhile speakers, room characteristics and subwoofer position. Because of variables, there is no single recipe for obtainingotherbest audio results.

you can certainly apply sound meters and analysis equipment in establishing the right settings, most people use their ears and a few familiar recordings to determine the best settings.

Setting the Level Control

Use the Level control (#2) to adjust the volume of the subwoofer to properly

match that f the satellite speakers. We suggest starting with this knob in the

12 o’clock position.

 

Note: Placement has a great deal to do with how the Level knob is set. If

the SBX is placed on the floor against one wall in a normal room, for

example, the resulting sound pressure may be as much as 3dB greater

than if the

stands alone. Placement a corner could add

another 3dBsubwoofersound pressure over placement against a wall alone.

Setting the Phase Control

 

 

The purpose of the Phase control (#3) is to match the phase the Satellite

HPF cut off frequency to the phase of the

LPF cutoff frequency.

Adjust the Phase in order to make sure that Subwooferthe oofer and Satellites are

in phase at the selected crossover frequency. This will allow you to achieve

maximum sound pressure and the most accurate sound quality from

the whole system. A little experimentation here may be in order. When signals

are out of phase, they tend to cancel each other. This is most likely to occur

when using bass management, in which case both the “Subwoofer” and

“Satellites” cutoff frequencies are set to the same frequency settings (see

next two sections for more

. Rotate the Phase control knob until

SBX sounds the most robust,information)return

it to the 0 degree position if that is the

optimum setting or if you hear no difference.

 

9

SettingThe fundamentalthe Subwconceptof r LPFbehindandthetheStereoSatellitesBass ManagementHPF System is to isolate the upper and lower frequency ranges and direct them respectively the component best suited to reproduce them. In order to accomplish this, the SBX utilizes a crtossover network andto eterminemonitorsh w different frequency ranges are distributed the subwoofer satellite .

db

 

 

 

 

0

 

 

 

 

- 5

 

 

 

 

- 10

 

 

 

 

- 15

 

 

 

 

- 20

 

 

140

 

 

 

 

50 70 100

175

30

50

100

175

500 Hz

10

This crossover network consists of two main components: 2nd order (12

db/octave) low-pass filter that limits the upper frequencies that the subwoof

has to reproduce (shown above), and

high-pass filter that limits the lower

frequencies the satellite monitors have

to reproduce (shown below). The

Subwoofer LPF cutoff frequency (#4) and Satellite HPF cutoff frequency (#5) controls adjust frequencies of the lowand high-pass filters, respectively. Both have a range of 50 to 180 Hz.

db

0

-5

-10

-15

-20

50

70

100

140175 Hz

30

50 100 175

500 Hz

You will need to use your ears to determine the best settings for these filters. The frequency markings shown next to each control knob may give you some guidelines. 50Hz (or above) might be used as a setting for music production. 80Hz is the proposed setting for Dolby Digital playback, while 100Hz is the proposed setting for THX.

11

If your satellites are properly damped at the bass response as shown in curve “a,” set the two crossover frequencies to be identincal. If your satellite speakers are under-damped (boomy sounding) as shown curve “b,” experiment with setting the Satellite crossover frequency control higher. If they are over-damped (dry sounding) as shown in curve “c,” experiment with a lower setting. You may want to note the final control settings in case they are accidentally altered.

+ 5

b

db 0

a

- 5

c

 

-10

-15

-20

Hz

In the event that you do choose an external form of bass management,Note: you will likely need to set the Subwoofer LPF cutoff frequency to 180Hz. If you choose not to use the SBX internal bass management or an external form of bass management, you may want to begin with a Subwoofer LPF cutof frequency of 120Hz and experiment up or down until you reach your desired sound.

Troubleshooting & Technical Support

Avoiding Problems with Turntables

 

Since the SBX can produce

output level at low frequencies,

acoustic feedback via a turntableinstallationconsiderableoccur. To ensure that this is not the case, perform the following test at of the SBX.

Set up the equipment for playing a record. Place the stylus on a non-rotating record (disconnect the turntable power cord if necessary). Tap the turntable

12

while gradually increasing the volume of your audio system. If you begin to

hear a

sound quality before you are able to advance the volume

control tosustainingsetting representing loud listening, acoustic feedback thisa problem. You may need to move either the turntable or the SBX to remedy

Alternately, try placing an anti-vibration pad under the turntable.

ReplacingThe SBX is protectedthe Fusefrom power anomalies by a fuse. In the event that the SBX does not seem to have power even though connected to AC, check the criticalondition of the fuse in the fuse holder (#11). If the fuse needs replacing, it is

to use only a fuse with an identical rating.

Support

 

The M-Audio.com website (www.m-audio.com) contains the latest

troubleshooting information. This should be your first

for up-to-date

information on the latest drivers, FAQ’s, and extensive howstopguides.

If you need additional assistance, after reading the following paragraphs and visiting our website, you may contact M-Audio’s Technical Support department by phone (626-633-9055, 9-5 PST M-F), by fax (626-633-9060) or by -mail (techsupt@m-audio.com).

Warranty Information

Terms

M-Audio warrants products to be free from defects in materials and workmanship, under normal use and provided that the product is owned by the original, registered user. Visit www.m-audio.com/warranty for terms and limitations applying to your specific product.

Registration

Thank you for registering your new M-Audio product. Doing so immediately both entitles you to full warranty coverage and helps M-Audio develop and manufacture the finest quality products available. Register online at www.m- audio.com/register to receive FREE product updates and for the chance to win FREE M-Audio gear.

13

Contact Information

If you have any questions, comments or suggestions about this or any M-Audio product, we invite you to contact us by using the following information:

M-AUDIO U.S.

 

M-AUDIO Deutschland (Germany)

5795 Martin Road, Irwindale, CA 91706-6211, U.S.A.

Kuhallmand 34, D-74613 Ohringen, Germany

Sales Information:

626-633-9050

Sales Information:

49 7941 98 7000

Sales Information (email):

info@m-audio.com

Sales Information (email):

info@m-audio.de

Tech Support:

626-633-9055

Technical Support:

49 7941 98 70030

Tech Support (email):

techsupt@m-audio.com

Technical Support (email):

support@m-audio.de

Fax:

626-633-9060

Fax:

07941 98 70070

Internet Home Page:

http://www.m-audio.com

Internet Home Page:

http://www.m-audio.de

M-AUDIO U.K.

 

M-AUDIO Canada

 

Unit 5, Saracen Industrial Estate, Mark Road,

1400 St-Jean Baptiste Ave. #150

Hemel Hempstead, Herts HP2 7BJ, England

Quebec City, QC G2E 5B7, Canada

Sales Information (phone):

44 (0) 1442 416590

Tel:

 

418-872-0444

Sales Information (fax):

44 (0) 1442 246832

Fax:

 

418-872-0034

Sales Information (email):

info@maudio.co.uk

Email:

midimancanada@m-audio.com

Technical Support (PC):

44 (0) 1309 671301

 

 

 

Technical Support (Mac):

44 (0) 1765 650072

 

 

 

Technical Support (email):

richard@maudio.freeserve.co.uk

 

 

 

Internet Home Page:

http://www.maudio.co.uk

Internet Home Page:

http://www.m-audio.ca

M-AUDIO France

 

M-AUDIO Japan

 

Unit 5, Saracen Industrial Estate, Mark Road

Annex Buliding 6F, 2-18-10 Marunouchi

Hemel Hempstead, Herts HP2 7BJ, England

Naka-Ku, Nagoya 460-0002, Japan

Sales Information:

0810 001 105

Tel:

81 52 218 3375

Sales Information (email):

info@m-audio-france.com

Fax:

81 52 218 0875

Technical Support:

0820 00 731

Technical Support:

0820 00 731

Technical Support (email):

support@m-audio-france.com

Email:

info@m-audio.co.jp

Fax:

44 (0) 144 224 6832

 

 

Internet Home Page:

http://www.maudio.co.uk

Internet Home Page:

http://www.m-audio.co.jp

14

Technical Specs

• Type : Bass-reflex powered subwoofer

Studiophile SBX Specification * :

Woofer Driver : 8-inch mineral-filled polypropylene cone with high-temperature

 

voice coil and damped rubber surround

Frequency Response : 30Hz – 180 Hz

Low-Pass Filter : Butterworth –12dB/octave <325Hz, -24dB/octave > 325Hz

Crossover Frequency : Adjustable 50Hz - 180Hz

Amplifier Power : 100W @100Hz, 4 ohm, 0.1% THD

Input Sensitivity :

89dB

S/N Ratio : > 100dB below full output, 100Hz

Dynamic Power :

120W

Input Connectors :

Two XLR balanced inputs; two TRS balanced/ unbalanced inputs

Output Connectors : Two XLR balanced outputs for satellites, one XLR

 

balanced output for additional subwoofer

Controls: Level : Phase; Subwoofer Frequency; Satellite Frequency

Switches : Auto on/off; Satellite high-pass output bypass

Input Impedance :

20k ohms balanced, 10k ohms unbalanced

Input Sensitivity :

150mV input produces full output with volume control

 

at maximum

 

 

Protection : Over temperature, turn-on/off transient, subsonic filter, external

 

mains fuse, ALC (avoid from hard clipping)

Indicator : Power On (green) or Stand-by/Protection (Amber)

Power Requirements : Dual-voltage (selectable by rear-panel switch) for

 

either 120V/~60Hz, 230V/~50Hz; powered via detachable 3-circuit line cord

Cabinet : Vinyl-laminated MDF

Dimension : 15.6 in. (h) x 10.63 in. (w) x 12 in. (d)

Shipping Weight : 36 lbs.

*

Specifications subject to change without notice.

15

 

SBX-050604

 

 

16