Alto Mac-2.4, Mac-2.3 Owners Manual

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Page 1

LTO

MAC 2.2/2.3/2.4

PROFESSIONAL STEREO AMPLIFIERS

OWNER'S MANUAL

www.altoproaudio.com

Version 1.1 NOV 2007

English

Page 2

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.

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

Be aware of all warnings reported

with this symbol.

Keep this Equipment away from water and moisture.

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

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

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

periods of time or during a storm.

Refer all service to qualified service personnel

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

train

Subway train

High level desktop monitors

Classic music concert

100 102 105 110 115

Rock concert

Page 3

IN THIS MANUAL:

1. INTRODUCTION..............................................................................1

2. FEATURES.....................................................................................1

3. CONTROL ELEMENTS...................................................................5

4. OPERATION...................................................................................8

5. BLOCK DIAGRAM........................................................................11

6. TECHNICAL SPECIFICATIONS.......................................................12

7. WARRANTY.................................................................................13

1. INTRODUCTION

Thank you for expressing your confidence in products by purchasing one of our MAC 2 Series stereo amplifiers. The MAC 2 series include MAC 2.2, MAC

2.3 and MAC 2.4. All models are rugged, 2 rack-unit stereo amplifiers fan-cooled. Despite their compact dimensions they provide a lot of power and a high value performance. They are all designed for heavy-duty application and they all can drive 2 ohm loads for long periods without overheating. Therefore they are suited to drive subwoofers with a minimum load of 4 ohms when working in Bridge Mode.

LT O

2. FEATURES

Clip-limiter circuit that is user-adjustable Switchable low-frequency filter at 30Hz Operating Mode is: Stereo, Parallel or Bridge Balanced XLR and 1/4" TRS input connectors Output connectors are speak-on jacks and binding post terminals Low-noise, variable speed fan Front panel LED indicating Signal and Clipping and Protection Status Manufactured under QS9000, VDA6.1 certified management system

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SPOTLIGHT

POWER

LTO

MAC 2.2

OFF

StereoPowerAmplifier

CH1 CH2

OWER

PROT

CLIP

MAC 2.2

LTO

MAC 2.3

OFF

StereoPowerAmplifier

CH1 CH2

OWER

PROT

CLIP

MAC 2.3

LTO

MAC 2.4

StereoPowerAmplifier

CH1 CH2

OWER

PROT

CLIP

POWER

OFF

MAC 2.4

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HOOK

STEREO MODE

LTO

MAC2 4

POWR

C1 C2

In this mode, 2 independent channels are sent to 2 separate speakers.

HOOK

PARALLEL MODE

LTO

MAC2 4

PO ER

C1 H2

One mono signal is input to channel 1 or Channel 2 of the MAC 2 series amplifier and then output to 2 separate speakers. Each speaker volume can be set separately.

Page 6

HOOK

BRIDGE MODE

LTO

MAC2 4

PO ER

C1 H2

The stereo or mono signal input to channel 1 and channel 2 is combined on the BRIDGE MONO connector. Only channel 1 Gain control is active. The power at the output will be combined power of the two channels.

HOOK

STEREO BIAMP

LTO

MAC2 4

OWR

H1 C2

LTO

MAC2 4

H1 C2

The Main Mix signal is routed into an electronic crossover. channel 1 drives the woofer and channel 2 drives the high frequency driver in a 2-way enclosure.

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SPOTLIGHT

3. CONTROL ELEMENTS

Front Panel:

1 POWER SWITCH

It powers the MAC 2 series ON and OFF.

2 POWER INDICATOR LED

This Power LED lights up when the unit is powered up.

3 PROTECTION LED

a. It will light up when the unit is in Protection Mode due to overheating, short

circuit, low impedance load or other causes (For MAC 2.2 & MAC 2.3).

b. It will light up when the unit is in Protection Mode due to overheating, exist

DC output or other causes (Only for MAC 2.4 ).

4ClipLED

a. These LEDs will light up when distortion reaches a level of 0.5%, Turn the

relative GAIN control down so that the CLIP LEDs only flash occasionally (For MAC 2 series).

b. The LED will light up due to short circuit, low impedance load (Only for MAC 2.4).

5 SIGNAL LED

These LEDs will light up when the signal at the output is at least 100 mV.

6GAINCONTROLS

These controls are used to adjust the output signal level.

7 COOLING VENTS

The MAC 2 series amplifiers are equipped with two fans, which can accelerate the flow of air to low the temperature inside unit. The inside temperature determines the fan speed, which controls the inside air flowing speed.

LTO

MAC 2.4

StereoPowerAmplifier

CH1 CH2

POWER

PROT

CLP

SIG

POWER

OFF

Page 8

SPOTLIGHT

3. CONTROL ELEMENTS

Rear Panel:

8 CIRCUIT BREAKER

This is an electronic fuse for protecting the unit from possible damage. When the unit is overloaded or the temperature inside the unit is too high, this push-type button will spring out and disconnect the power supply. Push the Breaker to restore normal working conditions.

9 IEC socket for AC power cable

Connect the supplied main cord. Do not insert the power cord into the MAC 2 series amplifier and into the AC Outlet until voltage has been correctly set.

10 XLR BALANCED INPUT CONNECTORS

Each Channel features balanced XLR and 1/4" jack sockets wired in parallel. The Balanced signals are less sensitive to hum noise generated by AC.

11SPEAKONOUTPUTS(Channel1&Channel2)

These connectors are specifically designed to connect high power speakers. The correct polarity is secured automatically, they prevent shock hazard and they lock-in securely.

12BINDINGPOSTOUTPUTS(Channel1&Channel2)

Please make sure to respect the speaker polarity when using binding post.

Caution:

turn off the unit before connecting an audio signal to the binding post to

avoid any electric shock!

A104

MODEL

SERAL

DESIGNEDIN ITALY

PUSH

BRIDGED NPUT

LINE

BALANCED INPUT

LINE

()

OFF ON

LF30HZ

FILTER

1 15V/20K

PARALLEL

(MONO)

OFF ON

CLIPLIMT

CONNECTION

GND)

BRIDGED

STEREO

INPUT

SRT

T(+)

R()

S(GND

CH-2

CH-1

CH 1 CH-2

CH1

BRDGED

CHANNEL1 CHANNEL2

CH2

BRIDGED

MONO

BREAKER

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SPOTLIGHT

3. CONTROL ELEMENTS

13 CLIP-LIMITER SWITCH

If a very high level signal is driven into the amplifier, the output signal will "CLIP", that is the peaks of the waveform will be flattered. The Clip Limiter circuit automatically reduces the gain to prevent the overdrive. You can switch the Clip Limiter circuit ON and OFF via the (13) switch on the rear panel of your MAC 2 series. If you use full range speakers, the Clip Limiter circuit will reduce the high frequency distortion and it will also protect the high frequency drivers. However, some Users prefer to switch the Limiter OFF to get more punch from Kick Drums and other sounds in the low frequencies area.

14 LOW FREQUENCY FILTER

This Filter rolls off audio signals below 30 Hz. In this way bass performance will be improved, because the subsonic motion of the cone will be cut out and more power is made available to the woofer in the audible range of frequencies. If you want our view: Keep the Filter ON most of the time unless you are filtering the signal before the input of the MAC 2 series. Especially vented speakers (bass-reflex) are very sensitive to subsonic frequencies (below 30 Hz).

15 OUTPUT MODE SELECTOR

The MAC 2.2/2.3/2.4 stereo power amplifier presents three operating modes:

-StereoMode In this mode, channel 1 and channel 2 operate independently (as a normal stereo amplifier). The channel 1 input signal will be output from the channel 1 output connector, and channel 2 input signal will be output from the channel 2 output connector.

- Parallel Mono Mode In this mode, channel 1 input signal will be output from the output connectors of both channels. Detail wiring diagram you can refer to chapter 4.

- Bridged Mode In this mode, channel 1 input signal will be output from the bridge-mono output connector. Detail wiring diagram you can refer to chapter 4.

16 COOLING FAN

This fan secures enough cooling for your MAC 2 series amplifier. The airflow is front-to-rear. The fan speed is electronically regulated depending on the temperature of the power devices.

Page 10

4. OPERATION

The MAC 2 series amplifiers provide three operating modes: stereo mode, parallel (mono) mode and bridged mode, you can decide each specific operating mode according to your actual application circumstance.

Operate MAC 2 series in Stereo Mode

In this mode, channel 1 and channel 2 operate independently (as a conventional stereo amplifier). The channel 1 input signal will be output from the channel 1 output connectors, and the channel 2 input signal will be output from the channel 2 output connectors.

Input wiring tips

BALANCED UNBALANCED

GND

FROM

INPUT

SOURCE

+ +

SH ELD SHIELD

BRIDGED

STEREO

PARALLEL (MONO)

INPUT

DESIGNEDIN I ALY

SHELD

FROM

SOURCE

LINE

BALANCED INPUT

LINE

( )

OFF ON

LF30HZ

FLTER

115V 20K

PARALLEL

(MONO)

OFF ON

CLIPL MT

NPUT

CONNECTON

S T

CH-1 CH-2

T+)

GND)

)

()

STEREO

SGND

BRDGED

B ID D

CHANNEL1 CHANNEL2

BRDGED

MONO

BREAKER

channel 2

CH 2

PUSH

A104

MOD L

PUSH

SERI L

CH-1

BRIDGEDINPUT

channel 1

channel 2

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4. OPERATION

Operate MAC 2 series in Parallel Mode

In this mode, the channel 1 input signal will be output from the output connectors of both channels. The channel 2 input jack is not used; the channel 1 and channel 2 volumes can be adjusted independently. Use the Parallel Mode when you want to drive two speakers with only one input signal keeping separate control of the volume of the two channels.

NOTE: since you are not using the channel 2 input you can use this socket to "daisy-chain" the signal to another amplifier.

Input wiring tips

BALANCED UNBALANCED

GND

FROM

INPUT

SOURCE

+ +

SHIELD SH ELD

SHIELD

FROM

NPUT

SOURCE

BRIDGED

STEREO

PARALLEL (MONO)

A104

OD L

S RIAL

DESIGN D IN IT LY

CH-2

PUSH

USH

CH-1

BRDGED NPUT

channel 1

LNE

(GND)

)

OFF ON

LF30HZ

FLTER

BALANCED

115V 20K

INPUT

STEREO

LNE

PARALLEL

(MONO)

OFF ON

CLP L MT

NO USING

CONNECTION

BRDGED

NPUT

SRT

T+)

)

SGND

CH1

BRD ED

CH2

CH 1 CH-2

BRIDGED

MONO

CHANNEL1 CHANNEL2

BREAKER

channel 2

channel 1

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4. OPERATION

Operate MAC 2 series in Bridged Mode

In this mode, the channel 1 input signal will be output from the bridge output connectors. ( The 2 RED binding post ) In this case, use the channel 1 volume control to adjust the volume, keep the volume control of channel 2 turned completely down ( counter clockwise ). Bridged mode is intended for driving loads with a total impedance of 4 ohms or greater. In Bridge Mode you will combine the power of both channels into one speaker. You will have available massive amount of power so check carefully the power handling of your speaker before operation.

Input wiring tips

BALANCED UNBALANCED

GND

FROM

NPUT

SOURCE

+ +

SHIELD SHIELD

SHELD

FROM

NPUT

SOURCE

BRIDGED

STEREO PARALLEL (MONO)

channel 1

A104

MO EL

SER

DESIGNEDIN ITAL

CH-2

LINE

BALANCED INPUT

PUSH

LINE

CH-1

BRIDGEDINPUT

NO USING

OFF ON

LF30HZ

FLTER

115V 20K

PARALLEL

(MONO)

OFF ON

CLP LIMT

INPUT

CONNECTON

SRT

(GND)

)

BRIDGED

STEREO

T( )

)

S(GN

BRDG D

CH 1 CH 2

BRIDGED

MONO

CHANNEL1 CHANNEL2

BREAKER

channel 2+

channel 1+

NO USING

channel 2-

channel 2+

Page 13

5. BLOCK DIAGRAM

Page 14

6. TECHNICAL SPECIFICATIONS

POWER SPECIFICATIONS

Stereo Mode (Both channels driven)

20Hz~20KHz

Bridge Mono Mode 20Hz~20kHz

ELECTRICAL SPECIFICATIONS

INPUT SENSITIVITY

INPUT IMPEDANCE

FREQUENCY RESPONSE

(at 10dB below rated output power)

VOLTAGE GAIN

DISTORTION(SMPTE-1M)

S/N ratio

GENERAL SPECIFICATIONS

PROTECTIONS

CONTROLS

INDICATORS

CONNECTORS

POWER SUPPLY

DIMENSIONS

WEIGHT

2 Ohms (EIAJ)

4 Ohms (RMS)

8 Ohms (RMS)

4 Ohms (EIAJ)

MAC 2.2

750 W 2

350 W x 2 230 W x 2

710 W

1500 W

1.15 V (+3.4 dBu)

10 K Unbalanced 20 K Balanced

25 Hz~25 KHz +0/-1 dB

-3 dB points: 5 Hz~50 KHz

30 dB

<0.03%

100 dB

Full short circuit, open circuit, thermal, ultrasonic, and RF protection stable into reactive or mismatched loads, turn ON/OFF, muting, tried crowbar

Front: AC switch, Input level control for each channel Rear: stereo/ parallel/ bridged selector, 30Hz filter selector clip ON/OFF selector.

SIGNAL: 2 green LED POWER: 1 Blue LED

INPUT : Active balanced XLR and 1/4"(6.3 mm)TRS OUTPUT: "Touch-proof" binding posts and speak-on jacks.

Available for 110-120 V or 220~240 V AC, 50/60 Hz

483(W) 460(D) 88.8(H)mm

13.6 kg 15.6 kg 20.55 kg

MAC 2.3

1000 W

510 W

285 W

1000 W

2200 W

1.15 V (+3.4 dBu)

32dB

<0.03%

100 dB

CLIP: 2 red LED

PROTECTION: 1 red LED

MAC 2.4

1800 W

900 W

560 W

1800 W

3100 W

1.15 V (+3.4 dBu)

34 dB

<0.03%

100 dB

Page 15

7. WARRANTY

1. WARRANTY REGISTRATION CARD

To obtain Warranty Service, the buyer should first fill out and return the enclosed Warranty Registration Card within 10 days of the Purchase Date. All the information presented in this Warranty Registration Card gives the manufacturer a better understanding of the sales status, so as to provide a more effective and efficient after-sales warranty service. Please fill out all the information carefully and genuinely, miswriting or absence of this card will void your warranty service.

2. RETURN NOTICE

2.1 In 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 information about your return address and contact telephone number.

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 materials

LT O 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 at its own option at no charge to you for parts or for labor in accordance with the right side of this limited warranty.

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

product / force / etc. Abnormal service or repairing by anyone other than the qualified personnel or technician.

And in such cases, all the expenses will be charged to the buyer.

3.5 In no event shall be liable for any incidental or consequential damages. Some states do not allow the exclusion 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.

LT O

Page 16

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

SEIKAKU TECHNICAL GROUP LIMITED

http://www.altoproaudio.com Tel: 886-4-22313737

email: alto@altoproaudio.com Fax: 886-4-22346757

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

NF03010 1.0

Alto Mac-2.4, Mac-2.3 Owners Manual

Specifications and Main Features

Frequently Asked Questions

User Manual