Crown Macro-Tech MA-2402 Manuale utente

Celebrating the Crown

Macro-Tech Series

Your Macro-Tech®Signature Series ampliﬁer is the

culmination of a long heritage of Crown®products

and design ideas that began in the early 1970s.

In these pages you can explore how the Macro-Tech Series

came to be, understand its advanced features, and enjoy

stories and sales literature from its colorful past.

Sometimes a product ﬁts an application so well, it

is deemed a classic. The term is synonymous with

the Crown®Macro-Tech Series of power ampliﬁers.

That product line, and its predecessor Micro-Tech®, sparked

innovative technologies that provided lower distortion, less

thermal stress, higher output power, greater reliability, more

power density and superior audio quality.

No compromises, no gimmicks. Just brilliant engineering

backed by superior manufacturing, support and an

unsurpassed commitment to quality.

Like all Crown amps, the deﬁning characteristic of the Macro-

Tech Series is sonic accuracy. A tight, rock-solid low end, with

smooth, detailed highs and a well-deﬁned midrange. In short,

Crown Macro-Tech Series

Enjoy!

the most accurate reproduction of an audio signal you’ve ever

heard. And because we put the quality of sound above all else,

Crown ampliﬁers are the most coveted in the business.

When it comes to manufacturing amps, our work is based on

one simple fact: there are no shortcuts to quality. And our Macro-

Techs have proven this time and time again in some of the most

demanding applications in the world.

For this special, limited Macro-Tech release, we wanted to bring

you more than just the typical operation manual. This brochure

goes much further, delving into the Macro-Tech’s development,

design philosophy, and advanced technical features. We’ve also

included some brochures from the past, a bio of Crown’s chief R&D

engineer Gerald Stanley, customer statistics, anecdotes and more.

Since 1984, Crown has shipped

approximately 272,625 MT and MA

ampliﬁers to date. That’s approximately

54 million watts into 4 ohms or 65

million watts into 2 ohms!

Crown Macro-Tech ampliﬁers were used at the 64,640-seat Sangam Stadium in Seoul, South Korea, during the 2002 World Cup.

A Sampling of Crown Macro-Tech Users

THEME PARK

Universal Studios

Everland (Korea)

Six Flags of America

FIXED INSTALL

Club Capitale

Sydney 2000 Olympics

Crystal Cathedral

Ofﬁcial All Star Cafe

Hard Rock Live

Experience Music Project

Spirit, Roxy

Deep night clubs

TOUR

Neil Diamond tour

Pro Show, SPL Sound, XFL

Seoul Word Cup 2002

Audio Analysts

Morgan Sound

Clair Brothers

Disturbed (band)

Art Garfunkel Tour

Maryland Sound

Gemini Sound

On Stage Audio

Enterprise Live

STADIUM / ARENA

American Airlines Arena

American Airlines Center

Ralph Engelstad Arena

Key Arena

Xcel Energy Arena

Conseco Field House

Coors Field

Volkswagen Stadium

Hong Kong Stadium

Racks of Crown Macro-Tech ampliﬁers power this 2001 extravaganza staged in Salt Lake City’s Salt Palace for the Annual

Gala held by Utah Governor Mike Leavitt. Rocky Mountain Audio Visual chose Crown Macro-Tech along with JBL Vertec

speakers to provide concert-quality sound for the event. (Find out more at http://www.jblpro.com/pressroom/rmav_utah.htm.)

Crown Macro-Tech ampliﬁers power the premium sound system employing JBL PD Series speakers in the 400,000 sq. ft. Ralph Engelstad Arena in Grand Forks, North Dakota.

The Macro-Tech Design Philosophy

The Macro-Tech product line, and its precursor

Micro-Tech®, awed the audio industry with new

technologies that reduced distortion and thermal

stress — while increasing reliability, audio quality, power density

and power output.

Three patented technologies invented by Crown’s Gerald Stanley

led to those beneﬁts:

•Grounded Bridge™topology provided 4 times the power of

existing power transistors without sacriﬁcing reliability.

•Junction Temperature Simulation (JTS), otherwise known

as Output Device Emulator Protection (ODEP®), protected

the power transistors from overheating and maximized their

potential power output by keeping them at the optimum

temperature.

•Variable Impedance or VZ®power supply, also called bi-level

power-supply switching, was used in the MA-3600VZ and MA-

5000VZ Series. The supply changes its impedance to adapt to

the signal voltage and current. This technology permits large

amounts of power in a compact package while achieving ultra-

low distortion and without generating excess heat.

How It All Began...

The brainstorming for this whole family began with

collaboration between engineers Gerald Stanley and Jim

Wordinger. In considering the drawbacks of current power

ampliﬁers, they were looking for ways to:

•pack more power into a smaller rack space

•improve reliability by preventing overheating

•lower the cost per watt.

Gerald’s Grounded-Bridge design and Junction Temperature

Simulation were already in his toolkit. In 1975, JTS was

employed in the SA-2 and PSA-2 ampliﬁers, while Grounded

Bridge was used in the M-600.

Gerald and Jim thought, “How about taking our two best

technologies and putting them in the same product?” The

Micro-Tech Series was born. The original name of this series

was to be HVA for High Value Ampliﬁer.

How about

taking our

two best

technologies

and putting

them in the

same product?”

In those days, Crown was

recognized as a manufacturer

of home hi-ﬁ products. But the

HVA Series was intended for

pro audio Touring and MI, not

for the living room. It was a new

direction for Crown.

Crown’s president at that time,

Max Scholﬁeld, recognized that

Crown’s marketing needed to

be shaken up, so he hired Dr.

Clay Barclay to drive change

in Crown’s marketing and sales

divisions. Clay realized that

the MI and Touring industries

needed a product like this, and

he sold the idea to Crown and

to potential customers.

A 1983 schematic by Gerald Stanley of the Grounded Bridge circuit.

Micro-Tech

Jim and Clay used to share ideas over lunch, where Jim told Clay

about the concept. Clay came up with the name “Micro-Tech”

because the goal was to put high technology into a micro-sized

amp. It was a new packaging paradigm as well as a new market.

In the early 1980s, Jim Wordinger went to Showco, one of the

major touring sound companies. At that time they were doing

sound for David Bowie using PSA power amps. According to

Jim, “We asked them what they would like to see in an ampliﬁer.”

“They said, ‘We’d like them smaller and lower-cost.’ I couldn’t

say anything about what we were working on, but their comment

certainly vindicated our design goals. Showco was one of

our ﬁrst customers; they used a lot of Micro-Techs. We had a

relationship with them. They would ﬁnd any problems ﬁrst and

then we’d ﬁx them.”

Eventually Clair Brothers bought Showco. Now they are using

over 2000 MA-3600VZs.

The MT-700 (never released) was the ﬁrst Micro-Tech amp. Then

came the MT-1000 which provided 1000 watts into 2 ohms. Next

was the MT-1200 which produced 1200 watts, thanks to bigger

power transformers.

The technology in Micro-Tech products helped Crown develop

amps for Magnetic Resonance Imaging (MRI). General Electric

asked Crown to make ampliﬁers with more voltage and current

than what was available. We created bigger amps for GE, such as

the 7780, using JTS and Grounded Bridge.

An early sketch by Jim Wordinger

showing a proposed chassis layout

of a pre-Micro-Tech power ampliﬁer.

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