Alto Professional MS8 User Manual

OWNER'S MANUAL

MS8/MS8A/MS12S/MS12SA

SPEAKER ENCLOSURE

ACTIVE MODELSPASSIVE/

www.altoproaudio.com

Version 1.1 Apr 2009

English

IMPORTANT SAFETY INSTRUCTION

CAUTION

RISK OFELECTRIC SHOCK

DO NOTOPEN

TO REDUCE THE RISK OF ELECTRIC SHOCK
PLEASE DO NOT REMOVE THE COVER OR
THE BACK PANEL OF THIS EQUIPMENT.
THERE ARE NO PARTS NEEDED BY USER
INSIDE THE EQUIPMENT. FOR SERVICE,
PLEASE CONTACT QUALIFIED SERVICE
CENTERS.

This symbol, wherever used, alerts you to the

presence of un-insulated and dangerous voltages
within the product enclosure. These are voltages that
may be sufficient to constitute the risk of electric
shock or death.

This symbol, wherever used, alerts you to
important operating and maintenance instructions.

Please read.

Protective Ground Terminal
AC mains (Alternating Current)

Hazardous Live Terminal
ON: Denotes the product is turned on.
OFF: Denotes the product is turned off.

CAUTION

Describes precautions that should be observed to
prevent damage to the product.

1.

Read this Manual carefully before operation.
Keep this Manual in a safe place.

2.

Be aware of all warnings reported

3.

with this symbol.

4.

Keep this Equipment away from water and
moisture.

5.

Clean it only with dry cloth. Do not use
solvent or other chemicals.

6.

Do not damp or cover any cooling opening.
Install the equipment only in accordance with
the Manufacturer's instructions.

Power Cords are designed for your safety. Do

7.

not remove Ground connections! If the plug
does not fit your AC outlet, seek advice from
a qualified electrician. Protect the power
cord and plug from any physical stress to
avoid risk of electric shock. Do not place
heavy objects on the power cord. This could
cause electric shock or fire.

Unplug this equipment when unused for long

8.

periods of time or during a storm.

Refer all service to qualified service personnel

9.

only. Do not perform any servicing other than
those instructions contained within the
User's Manual.

To prevent fire and damage to the product,

10.

use only the recommended fuse type as
indicated in this manual. Do not short-circuit
the fuse holder. Before replacing the fuse,
make sure that the product is OFF and
disconnected from the AC outlet.

WARNING

To reduce the risk of electric shock
and fire, do not expose this equipment
to moisture or rain.

Dispose of this product should
notbeplacedinmunicipalwaste
and should be separate collection.

MovethisEquipmentonlywithacart,

11.

stand, tripod, or bracket,
specified by the
manufacturer, or
sold with the
Equipment. When
a cart is used, use
caution when
moving the cart /
equipment
combination to
avoid possible
injury from tip-over.

12.

Permanent hearing loss may be caused by
exposure to \ extremely high noise levels.
The US. Government's Occupational Safety
and Health Administration (OSHA) has
specified the permissible exposure to noise
level.
These are shown in the following chart:

HOURS X DAY

8
6
4
3
2
1,5
1
0,5
0,25 or less

According to OSHA, an exposure to high SPL in
excess of these limits may result in the loss of
heat. To avoid the potential damage of heat, it is
recommended that Personnel exposed to
equipment capable of generating high SPL use
hearing protection while such equipment is
under operation.

The apparatus shall be connected to a mains
socket outlet with a protective earthing
connection.

The mains plug or an appliance coupler is used
as the disconnect device, the disconnect device
shall remain readily operable.

EXAMPLE

SPL

Small gig

90

train

92

Subway train

95

High level desktop monitors

97

Classic music concert

100
102
105
110
115

Rock concert

IN THIS MANUAL:

1. INTRODUCTION

2. SPEAKER CABINET QUICK START

3. HOOKUP DIAGRAMS

4. WIRE CONNECTIONS

5. RIGGING

6. FREQUENCY RESPONSE

7. PANEL DESCRIPTION- A/MS12SAMS8

8. PANEL DESCRIPTION-MS8/MS12S

9. TECHNICAL SPECIFICATION

10. WARRANTY

1

2

4

6

7

9

11

13

14

16

1. INTRODUCTION

Thank you very much for expressing your confidence in LTO products by purc­hasing MS8/MS8A/MS12S/MS12SA speaker system. The MS series cabinets
are specifically designed for using in hi-quality performance site and the precise
sound reinforcement commercial place. uses trapezium configuration which
greatly decreases the resonance of the standing wave in the cabinet. These
cabinets uses hi-density matrix spray-paint technics and the bottom bracket
design which make mounting quickly and Flexibly. The HF compression driver and
vented LF for fully professional performance.

The MS8A/MS12SA speaker cabinets include some exclusive innovations such as
switch mode power supply and digital power circuitry (in selected modes) that
make them the lightest powered cabinets of this kind ever made.

The MS full range models include another Alto innovation: The MODELLER.
Thanks to this circuitry, User can select 16 different tastes and applications.
The 16 kinds of sound presets especially thought for application with or without
subwoofer, for voice optimised application, for Disco Music, for jazz, for Rock &
Roll among others.

Enjoy your MS8/MS8A/MS12S/MS12SA speaker cabinet and make sure to read
this manual carefully before operation.

1

SPOTLIGHT

2. SPEAKER CABINET QUICK START

Make all initial connections with all the equipment powered off, and ensure that
all the main volume controls are turned completely down.

1). Connect one side of the speaker cable to the output CHA/CHB or Binding
Post of your stereo power amplifier and the other side to the input socket
of your speaker cabinet.

2). Complete other connections as illustrated.

3). Turn on your mixer first, then the stereo power amplifier.

4). Turn up the volume controls of your amplifier to about 70%.

5). Use PFL function to get the proper input level for the mixer, and adjust
the main mix level control to manipulate the output level.

6). After using, turn off your stereo power amplifier first, then the mixer.

Speaker Cable

Speaker Cable

MS8 MS8

D1

Stereo

SIGCLIPPROT SIGCLIPPROT

20

20

18

18

22

22

16

16

24

24

26

26

12

12

28

28

6

6

(dB)

(dB)

CH1

CH2

30

30

500W2

Power Amplifier

Tripod
Mount

Left

Main Mix

Output

Right

Main Mix

Output

Tripod
Mount

Mixer

2

SPOTLIGHT

2. SPEAKER CABINET QUICK START

Make all initial connections with all the equipment powered off, and ensure
that all the main volume controls are turned completely down.

1). Connect one side of the signal cable at your audio mixer into output

left /right (with Stereo-Jack or XLR) and the other side of the cable into
the line input (Stereo-Jack) of your active speaker cabinet.

2). Connect the power cord to mains.

3). Turn on your mixer first, then the active speaker cabinets.

4). Turn up the volume control of the active speaker cabinets.

5). Use PFL function to get the proper input level for the mixer, and adjust

the main mix level control to manipulate the output level.

6). After using, turn off your active speaker cabinets first, then the mixer.

Signal Cable

MS8A MS8A

Power Cord

Tripod
Mount

Left

Main Mix

Output

Mixer

Signal Cable

Right

Main Mix

Output

Power Cord

Tripod
Mount

3

HOOK

3.HOOKUP DIAGRAMS

UP

Two active speaker in stereo operation

LINE IN LINE IN

MAIN OUT L MAIN OUT R

MS8A MS8A

MIXER

Tripod
Mount

Multiple active speakers with the same stereo source

MIXER

MAIN OUT LEFT MAIN OUT RIGHT

LINE IN

LINK LINK

LINE IN LINE IN

LINK TO NEXT SPEAKER LINK TO NEXT SPEAKER

Tripod
Mount

MS8A MS8A

Tripod
Mount

Tripod
Mount

Tripod
Mount

Tripod
Mount

4

HOOK

3.HOOKUP DIAGRAMS

UP

Two active subwoofers and two active satellite speakers

LINE IN LINE IN

MS8A MS8A

MS12SA

Tripod
Mount

MAIN OUT LEFT

LINE IN LEFT/MONO

MAIN OUT RIGHT

LINE IN LEFT/MONO

MIXER

MS12SA

Tripod
Mount

One active subwoofers and two active satellite speakers

MS8A MS8A

MS12SA

Tripod
Mount

LINE IN LEFT/MONO

MAIN OUT LEFT MAIN OUT RIGHT

LINE IN RIGHT

LINE INLINE IN

Tripod
Mount

MIXER

5

4 WIRE CONNECTIONS.

-.For Active Speaker Cabinets

As to these circumstances,audio connections is mostly intended for the signal
flow,so,determine the wire configuration according to your real application
system and its connecting facility.Normally,you have the following choices:

-.For Passive Speaker Cabinets

Please use the power connectors to make connections with other signal source

only
equipment for the passive speaker cabinets. The power connector has four terminals:
1+, 1-, 2+, 2-.

1+

2-

1-

2+

In our cabinets, only 1+/1- are used to connect the Speaker+/Speaker-, and 2+/2­are not used.

6

5. RIGGING

The MS8/MS8A speaker cabinet also provides the bracket for fixed installation,
How to use them?

1).Inventory
Before beginning installation, inventory kit to items listed.

Item Q'ty Description

I 1PCS Bracket / Wallmount

II 2PCS Screw, M10*30*1.5PH, Black ( in the cabinet)

III 2PCS Washer, Neoprene, 1.5t 35mm

MH-8B

Warning:

Installation should only be done by an experienced technician. Improper
installation may cause serious injury . The surface where the bracket/cabinet
is to be fastened must have enough structural integrity .

2).Mounting the Bracket

Due to various construction methods and materials used today, the hardware
for securing the bracket to the mounting surface is not supplied. It is recom­mended that you consult a building professional for the proper mounting
hardware before mounting the bracket.

3).Removing the Shipping Hardware, Remove the flat head screws from the top

and the bottom of the cabinet using a 5mm wrench.

7

5. RIGGING

Choosing which slot to use there are three slots in each bracket arm. use

4).
the forward slot (as shown)when the cabinet is facing perpendicular to the
bracket mounting surface.

5).Hanging the Cabinet

Place a neoprene gasket on the bracket's lower arm. Center it on the

A.

appropriate slot.

Position the cabinet between the bracket arms.

B.

Align the bracket's top slot to the cabinet's M10 threaded hole.

C.

Holding the cabinet in position, insert the screw through the bracket slot

D.

and into the cabinet's top threaded hole and hand tighten.
Repeat step D through the bottom bracket hole.

E.

Position cabinet and tighten both screws with a 5mm wrench.

F.

8

6. FREQUENCY RESPONSE

+110

+100

d
B

S
P
L

+90

+80

+70

MS8A

+60

5030

100

200

500

Hz

1k

2k

5k

10k

20k

MS8

+110

+100

d

B

S
P
L

+90

+80

+70

+60

5020

100

200

500

Hz

1k

2k

5k

10k

20k

9

6. FREQUENCY RESPONSE

+110

+100

d

B

+90

MS12SA

S
P

+80

L

+70

+60

20 20k50 100 200 500 1k 2k 5k 10k

Hz

MS12S

+110

+100

d

B

S
P

+90

+80

L

+70

10

+60

20 20k50 100 200 500 1k 2k 5k 10k

Hz

SPOTLIGHT

7. PANEL DESCRIPTION-MS8A

ACTIVE FULL RANGE: MS8A

(1) BI-POLAR MAIN POWER SWITCH

(2) AC POWER SOCKET WITH MAIN FUSE

(3) GROUND SWITCH

(4) CLIP INDICATOR RED LED

(5) LINK OUT ON XLR CONNECTOR

(6) LINE INPUT ON COMBO CONNECTOR

(7) MAIN VOLUME CONTROL

(8) POWER SWITCHUNG BUTTOM

(9) PRESETS SELECTOR

Via this knob, you can select the right effect you wish to perform. There
are total 16 options for you, JAZZ CLUB+SUB, VIRTICAL SUB, STAGE
MONITOR, JAZZ CLUB, CONCERT HALL+SUB, DISCO, VOCAL, ROCK &
ROLL, FLAT, DRUM KICK, ANTIRUMBLE, CONCERT HALL, ARENA+SUB,
LOUDNESS, ROLL+SUB ACOUSTIC.ROCK & and

(5)(6) (7) (9)(4)

INPUT

BAL

POWER

1.FLAT

2.DRUMKICK

3.

ANTIRUMBLE

4.CONCERTHALL

DESIGNEDIN ITALY

ACINPUT

110-120V 50/60Hz~
220-240V 50/60Hz~

ACFUSE

100-120V:T6.3AL
220-240V:T3.15AL
POWERCONSUMPTION:350W

AC

INPUT

LINK

5.ARENA+SUB

6.LOUDNESS

7.ROCK ROLL+SUB&

8.ACOUSTIC

MODEL

Useonlywith a 250V fuse

9

8

10

7

11

6

12

5

13

0dB

4

14

3

MAX

8

9.JAZZCLUB+SUB

10.VIRTUALSUB

11.STAGEMONITOR

12.JAZZCLUB

2

1

PRESETS

13.CONCERTHALL+SUB

14.DISCO

15.VOCAL

16.ROCK ROLL&

15

16

(3)

-

VOLUME

SIGNAL

LIMIT

MS8A

SERIAL

ON

100-120V

220-240V

OFF

(1)(8)(2)

11

SPOTLIGHT

7. PANEL DESCRIPTION-MS12SA

ACTIVE SUBWOOFERS: MS12SA

(11)(10)(9) (12)

(13)

(6)

110

0V 220

AC INPUT

110-120V 50/60Hz~
220-240V 50/60Hz~

AC FUSE

110-120V:T6.3AL
220-240V:T3.15AL

-12

ON OFF

Useonly with a 250V fuse

AC INPUT

POWER

(7)

(8)

LEFT / MONO

LEFT

0dB

-

MAX

8

LEFT / MONO

BYPASS

HPF 80Hz

OUT

RIGHT

POWER

POWER CONSUMPTION: 350W

RIGHT

RIGHT

SIGNAL

LIMIT

VOLUME

PHASEGND

NORMAL

REVERSE

IN

LINK

MS12SA

SERIAL

MODEL

DESIGNED IN ITALY

ON-OFF main power switch

Input AC power socket with main fuse

POWER, Green LED, indicate ON status

(3)

BYPASS Switch Select the Hiqh pass filter or by pass

(4)

Ground Lift Switch

(5)

LINE IN RIGHT.ON XLR CONNECTOR

(6)

LINE IN LEFT/MONO ON COMBO CONNECTOR

(7)

LINK LEFT/RIGHT ON XLR CONNECTOR

(8)

(9)

SIGNAL/LIMIT, Red LED, indicate ON status

(10)

VOLUME main power amplifier control

(11) PHASE Switch Reverse the Polarity of the subwoofer output

(12) OUT LEFT/RIGHT ON 2xXLR CONNECTOR

(13) POWER SWITCHUNG BUTTOM

12

0V

-24

(3)
(4)
(5)

SPOTLIGHT

8. PANEL DESCRIPTION-MS8/MS12S

CONNECTION PLATE

PASSIVE FULL RANGE: MS8

(1) INPUT

Receive the power coming from an external power amplifier.
(SPK +1/-1 connected; +2/-2 not connected)

(2) THRU

Direct LINK for connect in parallel a second speaker cabinet.
(SPK +1/-1 connected; +2/-2 not connected)

Besides, the passive crossover included the electronic protection
on the driver.

MS8

SOUND REINFORCEMENT SPEAKER SYSTEM

POWER HANDLING:

CONTINUOUS - 150 Watts
PEAK - 300 Watts

IMPEDANCE:

8Ohm

MODEL

SERIAL

DESIGNED AND DEVELOPMENT IN ITALY

LINK

THRU

INPUT

(1) (2)

PASSIVE SUBWOOFERS: MS12S

a). Receive the signal coming from an external amplifier.

INPUT:

(SPK +1/-1 connected;+2/-2 not connected).

b). Power output for satellite speaker, under passive crossoverOUTPUT:

filtered at 125Hz (SPK +1/-1 connected; +2/-2 not connected).

SOUND REINFORCEMENT SPEAKER SYSTEM

POWER HANDLING:

CONTINUOUS: 300 Watts

IMPEDANCE: 4 Ohm

Max SPL: 120dB at 1mt

MODEL

SERIAL

DESIGNED AND DEVELOPMENT IN ITALY

OUTPUTINPUT

(a) (b)

MS12S

13

SPOTLIGHT

9. TECHNICAL SPECIFICATION

MS8A

Active System Type

Power System

Frequency Response

Maximum SPL @ 1m

Coverage (HxV)

Transducer Low

Transducer High

Active Crossover

Input Connector

Input Sensitivity

External Control

Power Supply

Enclosure Construction

Mounting / Suspension

Dimensions (HxWxD)

Net Weight

Shipping Weight

MS8

Passive System Type

Power System

Frequency Response (-10dB)

Sensitivity (1w @ 1mt)

Impedance:

Maximum SPL @ 1m

Coverage (HxV)

Transducer Low

Transducer High

Passive Crossover

Input Connectors

Enclosure Construction

Mounting / Suspension

Dimensions (HxWxD)

Net Weight

Shipping weight

8" 2-way Active Modelling Loudspeaker

2-way Bi-Amp, with MODELLER

350W-LOW CLASS D/65W-HIGH

200W-LOW CLASS D/35W-HI CLASS AB in Continuous

MODELLER presets setting

120dB Continuous/123dB Peak (Calculated)

70 x 70 nominal

8" Woofer, 1.5"voice coil, with double ventilation

1" Neodymium on Spherical Horn (Tractrix contour)

2KHz under analog processor

LINE-COMBO/ LINK-XLR-F Balanced (15kohm)

Line +0dB

MODELLER with 16 Preset / Volume Control/ Power ON with

Green LED/ Clip Limiter with Red LED/ Ground Lift.

120-240 Volt, in Switching Power mode.

MDF wood cabinet, glued and reinforced, black painted, one metal

handle and rubber foot.

Two point for suspension, one metal pole-mount, optional bracket.

493 x 304 x 293 mm (19.41" x 11.97 x 11.54")

12.06kg / 26.53 lbs

14.56kg / 32.03 lbs

8" 2-way Passive Speaker Cabinet

2-way Passive

150W continuous / 300W peak

67Hz-18kHz

94.5dB SPL

8 (nominal)

116dB continuous/119dB peak (Calculated)

70 x 70 nominal

8" Woofer, 1.5"voice coil, with double ventilation

1" Neodymium on Spherical Horn (Tractrix contour)

2.25kHz at 12dB/oct, with HF protection

Two Parallel SPK NL-4 for INPUT/ THRU

MDF wood cabinet, glued and reinforced, black painted;

one metal handle and rubber foot.

Two point for suspension , one standard pole-mount plus a

optional bracket.

493 x 304 x 293 mm (19.41" x 11.97 x 11.54")

11.29kg / 24.84 lbs

13.79 kg / 30.34 lbs

CLASS AB in EIAJ

14

SPOTLIGHT

9. TECHNICAL SPECIFICATION

MS12SA

Power System

Frequency Response (-10dB)

Maximum SPL @ 1m

Transducer Low

Active Crossover

Input Connector

Input Level

External Control

Power Supply

Enclosure Construction

Mounting

Dimensions (HxWxD)

Net Weight

Shipping Weight

MS12S

Power System

Frequency Response (-10dB)

Sensitivity (1w @ 1mt)

Impedance:

Maximum SPL @ 1m

Transducer Low

Passive Crossover

Enclosure Construction

Input Connectors

Mounting

Dimensions (HxWxD)

Net Weight

Shipping weight

12" Active Subwoofer Speaker Cabinets

350W Class D in EIAJ/300W Class D in Continuous

47Hz-125Hz

121dB Continuous/124dB Peak (Calculated)

12" Woofer, 2.5"voice coil, with double ventilation

HPF 80Hz under analog processor

L-R Input (Combo/ XLR-F) / L-R Link (2-XLR-M) /

L-R Output (2-XLR-M) Balanced (15kohm)

L-R Input Line 0dBu

Volume Control/ Phase Switch / HPF-80Hz By-Pass/ Power

ON with Green LED/ Clip Limiter with Red LED/ Ground Lift.

120-240 Volt, in Switching Power mode.

15mm Plywood cabinet, glued and reinforced, resistant

black paint, metal grille, rubber foot.

One metal standard pole-mount plus one metal handle

370x 530 x 480 mm (14.57" x 20.87 x 18.90")

18.6kg / 41.01 lbs

20.8kg / 45.86 lbs

12"Passive Subwoofer Speaker Cabinet

300W continuous

47Hz-160Hz

96dB SPL

4 (nominal)

120dB continuous/123dB peak (Calculated)

12" Woofer, 2.5"voice coil, with double ventilation

125Hz at 6dB/oct

15mm Plywood cabinet, glued and reinforced, resistant

black paint, metal grille, rubber foot.

INPUT-SPK NL-4 / OUTPUT-SPK NL-4, for Satellite Speaker

One metal standard pole-mount plus one metal handle

370x 530 x 480 mm (14.57" x 20.87 x 18.90")

18.10 kg / 39.90 lbs

20.30 kg / 44.8 lbs

15

10.WARRANTY

1. WARRANTY REGISTRATION CARD

To obtain Warranty Service, the buyer should first fill out and return the encl­osed Warranty Registration Card All the
information presented in this Warranty Registration Card gives the manuf­acturer a better understanding
effective and efficient after-sales warranty service.
mation carefully and genuinely, miswriting or absence of this card will void your
warranty service.

2. RETURN NOTICE

2.1In

case of return for any warranty service, please make sure that the pr­oduct is well packed in its original shipping carton, and it can protect your
unit from any other extra damage.

2.2

Please provide a copy of your sales receipt or other proof of purchase with

the returned machine, and give detail

2.3 A brief description of the defect will be appreciated.

2.4 Please prepay all the costs involved in the return shipping, handling and
insurance.

3. TERMS AND CONDITIONS

3.1 warrants that this product will be free from any defects in mat-LT O
erials and/or workmanship for a period of 1 year from the purchase date if
you have completed the Warranty Registration Card in time.

3.2 The warranty service is only available to the original consumer, who purch­ased this product directly from the retail dealer, and it can not be transferred.

3.3 During the warranty service, may repair or replace this product atLT O
its own option at no charge to you for parts or for labor in accordance with
the right side of this limited warranty.

within 10 days of the Purchase Date.

of the sales status, so as to purport a more

Please fill out all the infor-

3.4 This warranty does not apply to the damages to this product that
occurred as the following conditions:

Instead of operating in accordance with the user's manual thoroughly, any

abuse or misuse of this product.
Normal tear and wear.
The product has been altered or modified in any way.
Damage which may have been caused either directly or indirectly by another

3.5 In no event shall be liable for any incidental or consequentialdamages.LT O
Some states do not allow the exclu-sion or limitation of incidental or conse­quential damages, so the above exclusion or limitation may not apply to you.

3.6 This warranty gives you the specific rights, and these rights are

compatible with the state laws, you may also
have other statutory rights that may vary from state to state.

16

NO. 1, Lane 17, Sec. 2, Han Shi West Road, Taichung 40151, Taiwan

SEIKAKU TECHNICAL GROUP LIMITED

www.altoproaudio.com Tel: [phone]

email: [e-mail] Fax: [phone]

All rights reserved to ALTO. All features and content might be changed

without prior notice. Any photocopy, translation, or reproduction of part of this

manual without written permission is forbidden. Copyright 2009 Seikaku Group

c

NF03258-1.1