Quested SB10 User manual

SB10

User Manual

Quested Monitoring Systems Ltd.,

Units 6-8 Kingsgate,

Heathpark Industrial Estate,

HONITON,

Devon EX14 1YG

England

Tel: ++(0)1404.41500 Fax: ++(0)1404.44660

www.quested.com

CONTENTS

1 Introduction 3

2 Safety Considerations 3

2.1 General 3

2.2 Hearing damage 4

3 Unpacking 4

4 Installation 4

4.1 Positioning 4

4.2 Stand Mounting 5

4.3 Electrical Connection 5

4.3.1 Safety Earthing

4.3.2 Voltage Setting

4.3.3 Fuse Setting 6

4.4 Audio Connections 6-8

5 Operational Considerations 8

5.1 Mains On-Off Switching 8

5.2 Front panel indicators/control 8

5.3 Test 8

5.4 Crossover frequency 8

5.5 Bypass 8

5.6 Gain 8

5.7 Phase 8

5.8 Polarity 8

5.9 Power 9

5.10 Rear Panel Controls 9

Left input filter bypass

5.11 Internal Settings 9

Sub sonic/High pass filter

6 Setting up: The Whys and Hows of subwoofer use 9-13

6.1 WHY?

6.2 HOW?

7 Technical Specification 13-14

8 Line Drawing 14

9 Guarantee 14

10 Appendix 15

10.1 Accessories

10.2 Spares

10.3 Driver replacement

1 INTRODUCTION

Thank you for purchasing this Quested monitor. You can be certain that you have purchased one

of the finest monitors in the world. If you take time and care in positioning and aligning the system,

you will appreciate why Quested monitors have a reputation for faithful reproduction covering the

entire audible spectrum. They are professional monitors and therefore are not designed to flatter

but to faithfully reproduce. Please take care to maintain the system and it will give you many years

of service. You will also be assured the best possible performance and long-term reliability of your

system.

Please read this manual, which we have kept as concise as possible, as it really will help you and

covers important safety considerations.

The SB10 is a remote-powered sub woofer. Its remote electronics and its compact size make it

ideal in areas where space is at a premium but bass extension is still a requirement. However its

power output of 210 Watts RMS also enables the sub bass to be used in larger rooms and

applications requiring a powerful yet portable monitor. The SB10 has variable low and high pass

filters, which allow it to be matched accurately with a variety of full range cabinets. Used in

conjunction with the Quested S6, S7 or S8 active 2-way monitors, the SB10 enables an active, 3-

way, full range system in rooms that would preclude the use of a large full range monitors

The SB10 is remote powered, i.e. the amplifier and crossover electronics are housed in a separate

1U box. This brings with it several advantages. Firstly you can now mount the SB10 electronics

close to hand, bringing monitoring functions and metering to hand. This also makes it a lot easier

to precisely setup the sub bass. Additionally very low frequency reproduction causes vibration. In

standard self-powered designs these vibrations often feed back through the microphonic

components within the amplifier and cause distortion. Another advantage of this design is that the

cabinet and electronics can be upgraded independently of each other. Typical applications include

near to mid-field bass extension or dedicated LFE channel for recording/mixing, programming, post

production suites, broadcast and surround sound.

2 SAFETY CONSIDERATIONS

2.1 General

Before proceeding to connect your Quested monitor to the AC power supply, please read the

following safety information:-

CAUTION: RISK OF ELECTRICAL SH O CK. REFER SERVICING TO QUALIFIED

PERSONNEL.

THE POWER C ORD MUST ALWAYS BE REMOVED BEFORE THE

AMPLIFIER IS

DISMANTLED.

WARNING: TO REDUCE THE RISK OF FIRE OR ELECTRICAL SHOCK, DO N OT

EXPOSE THIS

APPLIANCE TO RAIN OR MOISTURE.

WARNING: THIS APPLIANCE MUST BE EARTHED.

The cores in the supplied mains lead are colour coded in accordance with the following code:

Green and Yellow: Earth

Blue: Neutral

Brown: Live

As the colours of these wires may not correspond with the coloured markings identifying the

terminals in your plug, proceed as follows:

The wire, which is coloured green and yellow, must be connected to the terminal in the plug,

which is marked with the letter ‘E’ or by the earth symbol, or coloured green and yellow.

The wire, which is coloured blue, must be connected to the terminal in the plug which is marked

with the letter ‘N’ or coloured black.

The wire, which is coloured brown, must be connected to the terminal in the plug which is marked

with the letter ‘L’ or coloured red.

NOTE: For certain countries the power cord will be supplied with an integral moulded plug

to satisfy national safety standards.

CAUTION: THIS UNIT C ONTAINS MAGNETIC C OMPONENTS, WHICH CAN AFFECT

ADJACENT

SENSITIVE EQUIPMENT.

2.2 Hearing damag e

This equipment can deliver sound pressure levels in excess of 100 dB. At this level permanent

hearing damage can occur and exposure to this level of sound, even for relatively short periods

(see table below), can be harmful. Of equal importance to the maximum level of sound is the

exposure to high levels of sound for extended periods. There are no internationally agreed limits

and different countries have different limits, which are measured in differing ways. IT IS

IMPORTANT THEREFORE THAT THE USER ESTABLISHES THE RECOMMENDED, AND

IN SOME

TERRITORIES, LEGAL LIMITS WHICH ARE IN PLACE. As a guide the table below shows the

levels

that are acceptable in the majority of Western Europe, the US and Canada:

dB(A) Listening time per day

90 8 hours

95 2.4 hours

100 40 minutes

105 15 minutes

110 5 minutes

115 and over Not at all

It is also important to note that the effect of exposure to sound is cumulative. Having listened to

sound for example for 15 minutes at 105 dB, further exposure to noise levels above 80 dB should be

avoided until the next day.

3 UNPACKING

This Quested product has been carefully manufactured, tested and packed to ensure that it arrives

in a flawless condition. The component parts of the packing have been thoughtfully designed to

offer sufficient protection during transportation, yet remain fully recyclable and should be retained

for future use. Also included in a separate bag will be the appropriate power cord for your country.

4 INSTALLATION

4.1 Positio ni ng/Mounting

The SB10 is designed to be mounted either vertically or horizontally. It should be placed on the

floor close to the cabinets it is reinforcing. If a single cabinet is used in mono, it should ideally be

placed as described in the detailed setting up instructions on page 9 of this manual. If two cabinets

are to be used they should be placed directly under the stereo, full range boxes. There is a linking

stand available for this purpose. Where possible avoid positioning the SB10 in a corner as this

increases the chance of exciting standing waves within the room, creating an unpleasant

boominess. It is important that if placed on a floor, the floor is flat and if mounted, the chosen

support is rigid so that the speaker does not vibrate when the monitor is driven. The supplied

spikes or feet should be used to stabilize the cabinet. Vibrations caused from uneven placement

will result in lack of low frequency definition. Its positioning close to or away from the rear wall

and

proximity to any room corners is best determined by experimenting and placing the speaker in

differing positions. The shape of the room, normal listening position and room treatment will all

have an effect on determining the speaker’s positioning.

The SB10 controller is designed to mount in a standard 1U rack space. It can also be mounted on

a table or shelf. The SB controller will dissipate heat through the case. It should be positioned with

provision for air circulation.

4.2 Stand Mounting

The SB10 has built-in mounting points that are located on two of the sides of the cabinet and are

for use with the Quested stands (see diagram). The position of the mounting points are indicated

on the line drawing on page 13 of this manual. When fixing the stand plate to the loudspeaker:

• The bolt length must always penetrate at least 25 mm into the cabinet base; the minimum

bolt length is 30 mm.

• Always use locking washers and thread lock compound.

• Always use all of the M6 bolts.

• Because the cabinet is a source of vibration, the bolts must be properly tightened but

caution must be exercised as over-tightening could damage the case. Always tighten the

bolts a little at a time in order to spread the stress over the area of the mounting plate. If a

torque wrench is available the recommended final torque is 6 Nm (4 lbf-feet). A 200 mm

(8”) spanner will achieve the appropriate torque without needing hard work. The mounting

plate holes are sealed by M6 x 16 mm nylon countersunk machine screws. These will need

to be removed before the cabinet can be screwed onto the mounting bracket.

THESE NYLON SCREWS SH OULD NOT BE USED TO MOUNT THE CABINET. THEY ARE

NOT OF

SUFFICIENT STRENGTH. A STEEL MACHINE SCREW OF AT LEAST 30 mm IN LENGTH

SH OULD BE

USED FOR THIS PURPOSE. If the SB10 is subsequently removed from the stand, the mounting

holes will need to be re-sealed using the nylon screws or some other suitable sealant.

4.3 Electrical Connection

4.3.1 Safety Earthing

This product has been designed to comply with international safety standards. It is

essential that the green/yellow core of the mains cable, or the ground pin of a 3-pin

moulded plug, is connected to the electrical installations safety earth or ground. It is

internally connected to all exposed metal surfaces and it is essential for personal

safety as well as proper operation of the product. Th e audio signal in-put is electronically

balanced and does not need the disconnection of any safety earth for the avoidance of

hum loops.

4.3.2 Voltage Setting

The set voltage is indicated on the rear panel of the unit. At this setting there is an

acceptable tolerance over which the performance of the unit will continue to meet its

specifications. (See power requirements on page 12 of his manual.) For the 230V setting

this is 160V to 255V and for the 115V setting it is 80V to 127V. If the unit is connected to

voltages in excess of its maximum, damage is likely to occur which may not be recoverable

from without qualified service attention.

To change the set voltage, the cover must be removed from the SB Controller. The

power and signal cables must be disconnected before continuing. Remove the 10 x M3 Torx

screws from the top cover. Remove the top cover and you will see 4 wires coming from the

mains transformer and connecting to the main PCB board in an area marked as

“transformer” on the PCB. Both the grey and violet wires must be moved to the desired

voltage tap as marked on the board. Be careful to ensure that the crimps are pushed firmly

home and the coloured wires correspond with the printing on the PCB. Replace the lid using

the 10 x M3 screws. You must now change the fuse located in the IEC inlet socket for the

correct one as indicated on the back panel. It is important that you now mark the rear of

the unit with the new set voltage.

115V 230V

Exploded view of PCB vi ewed from above showing the voltage s election

connectors with

alternative pins for the 115V and 230V settings.

4.3.3 Fuse Setti ng

It is very unlikely the fuse will fail during normal use but should this occur the situation

must be approached with some caution. Check that the mains voltage setting is correct for

your installation supply and that the original fuse was the correct rating. (See 9.2 Spares)

The fuse may blow if the unit is subjected to mains power surges or spikes, or if the mains

wiring has any poor or faulty connections, in which case a qualified electrician should be

consulted. Very occasionally a fuse can become degraded after many years of service and

simply replacing it with a new one will restore the system.

The fuse is housed in a unit integral with the IEC inlet connector (see rear panel drawing

page of this manual). To gain access to the fuse remove the power cord and unclip the fuse

carrier using a flat blade. A spare fuse of the correct rating is also provided within the same

carrier. If none of the above is the cause of the fault it is likely that the unit has suffered an

internal component failure and will need returning to a qualified agent for servicing IF THE

REPLACEMENT FUSE SHOULD FAIL DISC ONNECT FROM THE MAINS

IMMEDIATELY AND

HAVE THE UNIT PROFESSIONALLY REPAIRED BEFORE ATTEMPTING TO USE

IT.

4.4 Audio Connections

The audio signal inputs are RF filtered and electronically balanced to ensure a high level of

rejection for common mode interference signals and to give a professional connection to external

equipment. It is essential for optimal use of these specifications that a professional grade,

balanced two-core screened cable is used. The input’s will accept both XLR and ¼inch type

connectors.

Source Balanced Pin 2 hot

In accordance with international standards, 3-pin XLR style input connectors are used, with pin

2 being designated the ‘in-phase’ or ‘hot’ terminal and pin 3, the ‘out of phase’ or ‘cold’ terminal.

Pin 1 is connected to the chassis ground and must be connected to the screen of the audio

interconnecting cable. This is necessary to ensure proper compliance with European Standards for

Electromagnetic Compatibility. Pin 1 carries no signal voltages or currents and is provided purely for

screening purposes. It should not be connected to either pin 2 or pin 3.

Source Unbalanced Pin 2 Hot

If the equipment providing the audio signal has an unbalanced output, then the interconnecting

audio cable should be wired so that the hot output of the source is connected to pin 2 of speaker

input XLR and the ground of the source connected to pin 3. The screen of the interconnecting

audio cable should be connected to pin 1 of the input connector only. There must be no

connection between the ground connection of the unbalanced output and the pin 1

ground connection of the i nput connector.

Source Unbalanced Phono

If the source output is a phono socket, then the centre pin of the phono plug should be wired to pin

2 of the speaker input XLR and the outer phono casing to pin 3. The wire from pin 1 of the XLR

will not be connected to the terminals of the phono plug. Strict adherence to this will help to

eliminate ground loop hums and RF break through.

Source Unbalanced Pho no 2 Core cabl e

5OPERATIONAL C ONSIDERATIONS

5.1 Mains O n- Off Switchi ng and Level

A rocker switch on the front panel provides On-Off switching. When powering up an audio

system it is good practice to start at the source e.g. 1st outboard equipment, 2nd mixer, 3rd

SB10, 4th left and right monitors. When powering down the reverse order should be adopted.

5.2 Front Panel Indicators/Controls

5.3 Test

The test function is used to set the system up. It sends band limited pink noise to both the

sub bass out put and the full range monitors. A green LED indicates that the test signal is on.

5.4 Crossover Frequency

To allow you to accurately match the SB 10 to different monitors, different environments

and

different monitoring requirements the SB controller has adjustable crossover points. These

can be adjusted with the recessed pot in the front panel by using a flat bladed screwdriver.

The crossover point is sweepable between 40 and 135 Hz. It controls the frequency the high

pass filters that supply the full range monitors and the low pass filter that supplies the sub

bass cross over.

5.5 Bypass

This mutes the sub bass output and bypasses the crossover filters that are on the full range

monitor out puts. This can be used as a monitoring function, as it allows you to easily switch

between a 2 and 3-way monitoring set up. There is a green LED that indicates when the

SB10 is bypassed.

5.6 Gain

The sub bass amplifier gain can be adjusted with the recessed pot in the front panel by

using a flat bladed screwdriver. This has a range of 20 dBu. With 0 dBu input on 1 channel

and the gain pot set to 0 the amplifier will give 2 dBu below maximum output. This allows

you to accurately set the output level of the sub bass. 4 LEDs –18, -12, -6 and 0 dbB

indicate the level of the sub bass. The 0db LED indicates that the amplifier is 1 dB below

clip.

5.7 Phas e

This controls the phase of the sub bass and is used on installation to accurately match the

sub bass with both the full range monitors and the environment they are being used in. It can

be adjusted between 0 and 180 degrees with the recessed pot in the front panel by using a

flat bladed screwdriver.

5.8 Polarity

This controls the polarity of the sub bass. It is used in conjunction with the phase control to

accurately match the sub bass with both the full range monitors and the environment they

are being used in. Two green LED’s indicate when the sub bass polarity is both positive and

negative.

5.9 Power

On and off.

5.10 Rear Pan el Controls

Left input filter bypass

A recessed switch on the rear panel allows the left input filters to be bypassed changing the

left input to full range. A full range input should be used for a LFE source that has been

externally filtered. This switch should be used with caution. The SB10 should never be used

without any low pass filters. To use the SB10 without any low pass filters is likely to cause

damage to the drive unit. This is because the cabinet has a large resonance that is out of

the normal operating bandwidth.

5.11 Internal Setti ngs

Sub sonic/High pass filter

It is possible to change the subsonic/high pass filter from 14-28 Hz with internal jumpers.

There should be no need to alter this, as the unit will be shipped configured correctly for use

with your unit. This filter is used to gain more amplifier headroom if the speakers operating

bandwidth is above 28 HZ. IF this setting is to be changed, firstly disconnect all power and

signal leads. Remove the cover of the SB controller using a Torx driver. Locate the 4 jumpers

that are clearly marked and located on the main PCB behind the gain and phase pots. To fit

all of the jumpers will set the high pass filter to 28 Hz and to remove them all will set it to

Hz.

6 SETTING UP: THE WHYS AND HO WS OF SUBW O OFER USE

6.1 WHY?

The SB10(s) can be incorporated into a compact stereo monitor system to either extend

the system low frequency response, or increase the maximum system SPL, or to achieve

combination of both. Additionally SB10s can be utilised to reproduce the L.F.E. or .1

element

of a multi-channel system. In order to meet these objectives it is important that some

thought

is given to the positioning of the SB10(s) and that care is taken with the adjustment of the

crossover frequency, phase and relative levels.

The performance of any loudspeaker in a typical room will be, to an extent, dependant upon

its position. This is particularly true of subwoofers as low frequencies are more susceptible to

changes of cabinet position than high ones. There is a common misconception that bass is

not directional, the truth is that as the frequency lowers the less directional it becomes. For

this reason the higher the low pass frequency of the subwoofer the more critical its position

relative to the rest of the monitor system. If part of a program being played has transient

low

frequency components e.g. a kick drum, bad positioning of the SB10 will be particularly

evident.

6.2 HO W?

Positioning: Typical examples of stereo installations with a pair of S6 near-field monitors

and

a single SB10 are illustrated in Figs 1 & 2. The nearfield monitors are 120 cm from the

listening position and the SB10s are sited between the left and right monitors. Ideal

placements would be as in Fig. 1 for symmetrical room layouts and as in Fig. 2 for

asymmetric room layouts. In both examples the SB10s are on the same radius as the

left and right monitors and the centre of the arc is the listening position. To obtain the most

stable imaging and to maximize the area of the “sweet spot”, the axis of the left and right

monitors should cross at a point approximately 40 cm behind the listening position.

120cm

SB10

40cm

Speaker directed at a point

approximately 40cm behind

listening position

Diagram shows a symetrical room layout. The system is set up centrally

in the room, therefore the SB10 has been placed closer to the left hand

monitors, which allows the SB10 to be away from the room's centre.

Fig 1

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