Mackie SRM 450 Bedienungsanleitung

SRM450

Powered Speaker

SERVICE MANUAL

1999,2000 MACKIEDESIGNS,INC.

820-184-00

Page 3 is interactive

Go To Bulletins

SERVICE ON THIS EQUIPMENT IS TO BE PERFORMED BY

EXPERIENCED REPAIR TECHNICIANS ONLY

CONTENTS

Introduction.....................................................................3

Blockdiagram..................................................................4

Specifications...................................................................5

Overview..........................................................................6

Safety test........................................................................8

Bias adjustment...............................................................9

Test points.........................................................................10

Parts...................................................................................A-1

Fold-out Sections

Schematics and PCB layouts

Main board.................................................................227-1

INTRODUCTION

This manual contains basic service information. It is essential that you have a copy of the

user’s manual as this contains the complete operating instructions.

SERVICE TECHNICAL ASSISTANCE

MackieDesigns, Service TechnicalAssistance, is available 8AM -5PM PST, Mondaythrough

Friday for Authorized Mackie Service Centers, at 1-800-258-6883. Feel free to call with any

questions and speak with a carefully-calibrated technician. If one is not available, leave

a detailed message and a qualified Mackoid will return your call asap.

DISCLAIMER

The information contained in this manual is proprietary to Mackie Designs, Inc. The entire

manual is protected under copyright and may not be reproduced by any means without

express written permission from Mackie Designs, Inc.

SERVICE ON THIS EQUIPMENT IS TO BE PERFORMED BY

EXPERIENCED REPAIR TECHNICIANS ONLY

Click on any item to open that page

Block Diagram

INPUT

THRU

J15

HI-PASS

LOW CUT CONTOUR

COMPRESSOR

THRESHOLD

COMPRESSOR

SWEEPING

FILTER

LO-PASSDELAY

176uS

HI-FREQ

40-120 Hz LO-FREQUENCY

DRIVER

LO-FREQ

AMP

HI-FREQ

AMP

SENSE

RESISTOR

BASS CONTROL SERVO LOOP

WOOF

PEAK

LIGHT

PEAK

DETECTION

THRESHOLD

LPF

THRESHOLD

MIDVDC

LOVDC

HIVDC

TOROIDAL POWER

TRANSFORMER

FUSE POWER

SWITCH

OFF

+15VDC

SIGNAL

SENSE

SIGNAL

SENSE MUTE

ON/OFF

CONTROL

MUTE MUTE

POWER

LEDS

THERMAL

LED

THERMAL

SWITCH

LOW AC

VOLTS SENSE

TIMED

TURNOFF

SIGNAL

LED

Specifications

Low-Frequency Transducer

Diameter 300mm (12”)

Voice Coil Diameter 63.5mm(2.5”)

Sensitivity (1W@1m) 98dB

NominalImpedance 8ohms

PowerHandling 300W

FrequencyRange 50Hz – 3000Hz

High-Freq Driver and Horn

Diaphragm Diameter 44.5mm (1.75”)

Exit Throat Diameter 24.5mm (1”)

Diaphragm Material Titanium

Sensitivity (1W@1m) 106 dB

NominalImpedance 8ohms

PowerHandling 150W

FrequencyRange 1000Hz – 20,000Hz

Low-Freq Power Amplifier

Rated Power 300 watts

RatedTHD <0.1%

Cooling: Convection Extrusion

Design: Class G, Parametric Servo

Feedback

High-Freq Power Amplifier

Rated Power 100 watts

RatedTHD <0.1%

Cooling: Convection Extrusion

Design: Conventional Class AB

System specs

InputType Balanced Differential

Input Impedance Line: 20k ohms

Input Protection RFI and level protected

Sensitivity Line: +4 dBu (centered)

Mic:–36dBu

Maximum Input Level Line: +22 dBu

Low-CutFrequency 75Hz, Second-order filter

EQ Peaking+3dB@ 55Hz,

+3dB@20kHz

Over-Excursion Protection

Second-Order High-Pass

Filter

Thermal Protection Amplifier shutdown, auto-

reset

Low-Line Voltage Shut Down: 60% Nominal line

Acoustic Freq Response: 45Hz – 20,000Hz

Low-Freq –3 dB Point: 55Hz

MaximumSPL@ 1m: 123 dB

Low-Freq Crossover: 24 dB/octave, time offset

corrected

High-Freq Crossover: 24 dB/octave

Crossover Frequency: 1600Hz

Driver Protection IndependentLFand HF

compressors

Low-Freq Roll-Off: Dynamic-signal level de-

pendent

Accessory Interface ±15V DC

OperatingTempRange –10ºC- 45ºC (14ºF -113ºF)

Line Input Power

US 120V, 60Hz

Europe 230V, 50Hz

Japan 100V, 50/60Hz

Disclaimer

Since we are always striving to make our products

better by incorporating new and improved materi-

als,components,andmanufacturing methods, we

reserve the right to change these specifications at

any time without notice.

Overview

The SRM450 is an active two-way loudspeaker system capable of extremely high sound

pressurelevels.

The Transducers

The SRM450 active monitors feature a 12” high-power low-frequency woofer and a 1.75”

titanium diaphragm high-output precision compression driver. This high

frequency driver is mounted on an acoustically non-resonant exponential waveguide,

providing a wide, controlled dispersion and precise reproduction of the critical upper

mid-range and high frequencies. The result is an unbelievably smooth off-axis response

that allows everyone in the audience to experience the same high-resolution audio no

matter where they are seated.

Each driver has been specifically designed by our engineers for optimum performance in

the lightweight high-strength cabinet.

FR Series Power Amplifiers

To power these beautiful things, each SRM450 includes two of our acclaimed FR Series

“Fast Recovery” power amplifiers. Our exclusive design uses low negative feedback, yet

allows the amplifiers to maintain low distortion and stability and to quickly recover when

driven into clipping.

The amplifiers include the following features:

• The low-frequency amplifier produces up to 540 watts peak (300 continuous)

before clipping.

• The high-frequency amplifier produces up to 150 watts peak (100 continuous)

before clipping.

• Each amplifier has its own compressor circuit that acts when the input signal is large

enough to cause clipping, distortion and excessive voice coil heat. The compressor will

automatically decrease the input signal to a safe level. The compressor in the low-

frequency amp works independently from that in the high-frequency amp.

• The low-frequency amp uses a servo feedback loop which senses the current flowing in

the woofer coil. This controls the low-frequency response and maintains low distortion at

high output levels.

• The low-frequency amplifier also has a sweeping filter. This will automatically move the

low cut-off frequency up or down depending on the amplifier output. For example, if the

amplifier is below clipping, the low-frequency cut-off point is 55Hz. As it approaches

clipping, this shifts up smoothly to 120Hz, providing more power reserves and less

distortion before clipping. This happens quickly and continuously, protecting the amplifer

and the woofer and reducing any noticable distortion.

Warning: Although the amplifiers have these protection circuits, you must still make sure

the PEAK light is not blinking often or continuously. If it is, turn down your mixer faders, or

preamplifier gain, or turn down the SRM450 LEVEL control.

The Crossover

The built-in electronic crossover is a 24 dB/octave Linkwitz-Riley design.

Although more expensive than other crossover designs, the benefits provided by the

Linkwitz-Riley design have been well documented. These benefits include:

• Absolutely flat frequency response throughout the bandpass, without the characteristic

ripple near the crossover point exhibited by other designs.

• The sharp 24 dB per octave roll-off of the filters ensures that the transducers aren’t

reproducing frequencies outside of their capabilities.

• The acoustic sum of the two driver responses is unity at the crossover frequency, resulting

in perfect power response.

• Our heroic engineers have worked carefully to ensure that the SRM450 also provides

perfectphase response. This diligence hasyielded phenomenal accuracy, even ifyou are

standing 20 feet away.

The Cabinet

The SRM450 cabinet was designed to be the strongest molded composite cabinet on the

planet. This material is as strong as concrete, and rigid enough to prevent unwanted

vibrations in the cabinet. It has built-in fly points for hanging, and a socket in the bottom

for mounting on a tripod stand. Although it is an exceptional choice for installed sound

situations, its light weight and durable finish also make it ideal for portable sound system

use. The asymmetrical trapezoidal design of the cabinet makes it easy to use as a floor

wedge for stage monitor applications.

You must perform the following leakage test before returning the unit to your customer.

Take every safety precaution to protect yourself while doing this test.

1. Make a small loading RC circuit as shown in the diagram below, and connect the AC

volt meter between the AC power source ground and any exposed metal on the unit

under test.

2. Connect the unit under test to an AC power source using a ground-lift adaptor, leaving

the unit’s safety ground floating. Turn the unit on.

3. The meter reading should be less than 750mVAC (note: this is equivalent to 0.5mA of

leakagecurrent).

4. Flip the plug over in the receptical so the hot and neutral are swapped.

Verify that the reading is still less then 750mVAC.

5. If either reading is greater than 750mVAC, then you must investigate and repair the unit

before returning it to your customer.

Safety test

Bias adjustment

1. Place the SRM450 on its side so that the heatsink fins are horizontal.

2. Connect the power cord and turn it on, with no input

signal applied. Make sure that the TIMED TURNOFF switch is

OFF.

3. Let it sit this way for an hour or more to allow the heatsink

temperature to rise. You can play music through to speed

things up. If you have a thermometer, the bias adjustment

procedure is best done when the heatsink temperature is 45 to

50 deg C.

4. Turn off the SRM450 and remove the power cord.

5. Remove the complete amplifier/heatsink assembly from the plastic

speaker case but leave all wires connected, including the speaker wires.

Support the amplifier so it can be safely turned on again.

6. Replace the power cord and turn on the amplifier and take care not to touch any

exposed live AC components.

7. No input signal is applied.

8. Low frequency amplifier bias adjustment:

While the heatsink is still warm, measure the DC voltage across the 2 pins of J21. Adjust

R202 until a reading of 4mV to 4.5mV is reached. See sheet 2 for the location of J21 and

R202.

Important: When finished adjusting, secure R202 with a small drop of paint, such as nail

varnish.

9. High frequency amplifier bias adjustment:

Measure the DC voltage across the 2 pins of J20. Adjust R212 until a reading of 4mV to

4.5mV is reached.

Important: Secure R212 with a small drop of paint.

10. This completes the adjustment procedure. Reassemble and perform a full test.

The Amplifier Bias of every SRM450 must be carefully adjusted as follows.

LOW FREQUENCY

BIAS TEST POINT LOW FREQUENCY

BIAS ADJUSTMENT POT

HIGH FREQUENCY

BIAS TEST POINT

HIGH FREQUENCY

BIAS ADJUSTMENT POT

+80V

+15 VDC

-15 VDC

-80V +45V -45V

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