Mission 770 Manual de usuario

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Important Safety Information

Read these instructions. Keep these instructions. Heed all warnings. Follow all instructions.

Set the volume control at minimum when you switch on your system or change sources, and turn

the level up gradually.

DO NOT use your ampliﬁer at full volume.

Ensure that all loudspeakers in the system are correctly wired.

DO NOT subject your loudspeakers to excessive cold, heat. humidity or sunlight.

Loudspeakers should not be placed directly facing other hi-ﬁ units, or share the same shelf or

cabinet.

DO NOT place heavy objects on top of loudspeakers.

Some manufacturers forbid the placing of objects on top of their TV sets. Check your TV

handbook before installing the speaker directly on your TV set. Consult your TV dealer if you are

in any doubt.

DO NOT connect speaker terminals to the mains supply.

DO NOT dismantle the loudspeaker. There are no user serviceable parts inside it and you will void

the warranty by doing so.

Refer all servicing to qualiﬁed service personnel. Servicing is required when the apparatus has

been damaged in any way, the apparatus has been exposed to rain or moisture, does not operate

normally, or has been dropped.

Caution: Changes or modiﬁcations not expressly approved by the manufacturer could void the

user's authority to operate this device.

Before installing this product read all these instructions!

This symbol indicates that there are important operating and maintenance instructions

in the literature accompanying this unit.

Designer's Notes Contents Important

Safety Instruction

Music Leads,

Technology Follows

Loudspeaker Installation

Warranty Coverage

Technical Data

CONTENTS

Music Leads,

Technology Follows

Designer's Notes

Loudspeaker Installation

Warranty Coverage

Technical Data

Designer's Notes Important

Safety Instruction

Music Leads,

Technology Follows

Loudspeaker Installation

Warranty Coverage

Technical Data Contents

Music Leads, Technology Follows

Mission has built a world-class reputation for advanced audio design since the company’s

formation in Huntingdon, Cambridgeshire in 1977, with an engineering-led approach to product

development that has resulted in some of the most popular and iconic loudspeakers, ever

devised.

Three things have always characterised Mission speakers. First, the cabinets and drive units use

innovative materials and sport a distinctive, modern appearance. Second, the sound they

produce is fast, detailed and engaging. Third, they deliver excellent sonic and material value for

money.

Today, Mission continues to stretch the boundaries of what can be achieved at speciﬁc price

points, pioneering technologies to create fresh, new designs. Mission's team of engineering

experts is headed by award-winning audio designer Peter Comeau whose history with the Mission

brand stems from when he joined Mission as Director of Acoustic Design in 1999. The brand

beneﬁts from the unrivalled manufacturing facilities and global reach of parent company IAG,

with the majority of component parts of every loudspeaker now made in-house.

Yet the company’s roots remain ﬁrmly entrenched in Huntingdon, where much of Mission’s

design, servicing and technical support work is still carried out. This, coupled with a design team

brimming with British and European talent, ensures Mission speakers remain as impressive today

as they were when the company ﬁrst established itself at the forefront of the burgeoning British

audio scene more than 40 years ago.

Designer's Notes Important

Safety Instruction

Music Leads,

Technology Follows

Loudspeaker Installation

Warranty Coverage

Technical Data Contents

Designer's Notes

Legend has it that Farad Azima, Founder and CEO of Mission, was so taken with the design of the

Spendor BC1 that he wanted to improve upon it. Thus started the legendary Mission 770, a two-way

vented loudspeaker in the classic mode of the late ‘70s that was to shake up the hi-ﬁ world.

On the face of it, Mission 770 was nothing special. But, then, it’s often what’s under the surface that

surprises you. At its heart was a polypropylene cone, 8-inch bass unit that had started out life as a

Chartwell design and transmogriﬁed into a unit from SEAS of Norway by the time I got to hear a

prototype. The treble unit also came from SEAS and was a plastic 25mm dome. This pairing was then

surrounded by a chipboard cabinet heavily damped with bitumastic pads.

Above: The ﬁrst legendary Mission 770, a two-way vented loudspeaker in the classic mode of the

late '70s that was to shake up the hi-ﬁ world.

The Origins

Important

Safety Instruction

Music Leads,

Technology Follows

Loudspeaker Installation

Warranty Coverage

Technical Data ContentsDesigner's Notes

Designer's Notes

The mid ‘70s saw the expansion of subjective reviewing, as

opposed to the almost perfunctory paragraph of ‘listening

notes’ added to the end of extensive measurement and

technical description reviews that had gone before, and Farad

made the most of his editorial press connections.

I was a contributor to Hi-Fi Answers at the time and so

witnessed hearing some of the prototypes that Farad

presented at Paul Benson's (the editor) ﬂat. Among other

reviews, it was Paul’s revelatory review in HFA that described

the magic of the musicality of the 770 which was like a breath

of fresh air amongst loudspeakers of the time.

Above: Instantly recognisable in style and performance, the 700 series, and 770 in particular,

arestill hallmark Mission designs.

Above: Around 1978, Mission’s

legendary 770, the originator

of the famous 700 series, was

personally designed byFarad

Azima.

Important

Safety Instruction

Music Leads,

Technology Follows

Loudspeaker Installation

Warranty Coverage

Technical Data ContentsDesigner's Notes

Designer's Notes

Classically

Modern

The 770 soon became highly popular. It quickly turned into Mission's

best-selling speaker and gravitated naturally into Mk2 and Mk3 revisions with

improvements to sensitivity and power handling. After that, the design

eventually migrated to Freedom and other variations, but none of them

created the sales impact or notoriety that the original 770 received.

For the ‘new’ Mission 770, I was eager to revisit the original Mk1 design and

hear, again, the highly musical performance that I had witnessed back in 1978.

The key to the 770’s performance was, indeed, that combination of

polypropylene cone and resonance controlled cabinet and, so, this became

the emphasis for the design of the new model.

Accordingly, we developed a new polypropylene driver, mimicking the

extended response and low colouration of the original, while upgrading the

motor system to take account of modern power handling and dynamic

requirements.

Important

Safety Instruction

Music Leads,

Technology Follows

Loudspeaker Installation

Warranty Coverage

Technical Data ContentsDesigner's Notes

Drivers

Anew

Naturally, like the original, the driver is built on to an 8-inch (200mm)

die-cast chassis with large rear ‘windows’ to reduce early reﬂections

back through the cone. Special care has been taken to marry a low

density nitrile surround to the cone to match its impedance and reduce

reﬂections from the cone edge.

This new polypropylene cone has been treated with mineral ﬁlling to

enables you to hear exactly how bass instruments are being played. This

is balanced by tuning the cabinet and reﬂex port to a very low

frequency, avoiding the ‘one-note bass’ that is typical of a lot of

bass-reﬂex systems. In addition, the port is strongly ﬂared at both inlet

and outlet to smooth airﬂow and eradicate distortion. Bass extends

powerfully and cleanly to below 30Hz in room, which is remarkable for

this size of speaker.

Designer's Notes

Flux-focus

Sub-magnet

T-yoke

Main Magnet

Top Plate

High Flexibility

Progressive Spider

Large Diameter

Voice Coil

Mineral Loaded

Polypropylene Cone

Clamp Ring

Rigid Die-cast

Chassis

Low Damping

RubberSurround

Dust Cap

Above: Exploded technical diagram for the new Mission 770 bass unit.

Important

Safety Instruction

Music Leads,

Technology Follows

Loudspeaker Installation

Warranty Coverage

Technical Data ContentsDesigner's Notes

Designer's Notes

Drivers

Anew

For the new 770, we have chosen a lightweight, damped microﬁbre dome

with a super smooth response, backed by a damped rear chamber that

pushes the fundamental resonance well below the crossover region. The

quality of this 28mm treble dome matches and marries to the polypropylene

bass/midrange to ensure evenness of character throughout the range of the

whole speaker.

The original 770 crossover used a single coil to both balance and equalise the

bass to midrange response as well as cross over to the treble unit, the latter

driven by a resistor, capacitor and coil combination. This was always going to

be a compromise solution as it is not easy to use just a few components to

perform both functions.

Today’s advanced software crossover mapping and measuring techniques

allow us to accurately equalise the bass/midrange balance and adjust the

crossover to the treble unit by mapping the acoustic crossover slopes

accurately. The simplicity and elegance of the original 770 crossover has been

maintained, with additional elements added only to optimise the crossover

performance while retaining the musical character.

The best acoustic performance, featuring a seamless transition between the

bass and treble units while retaining all the thrilling musical detail and

emotion of the performance, has been realised through hundreds of hours of

listening sessions, using a wide variety of music.

Rear Chamber

Gasket

Vented Spacer

Sub-magnet

Foam Damping

Copper Wound

Glass Fibre Voice Coil

Microﬁbre

Polyester Dome

T-yoke

Main MagnetTop Plate

Gasket Aluminium

Front Panel

Felt Damper

Above: Exploded technical diagram for the new Mission 770 treble unit.

Important

Safety Instruction

Music Leads,

Technology Follows

Loudspeaker Installation

Warranty Coverage

Technical Data ContentsDesigner's Notes

Designer's Notes

AGenuine

Classic

Drivers and crossover are housed in a real-wood veneered cabinet with

stand-out product in the ‘70s hi-ﬁ market. Beneath the rich rosy-tinged

walnut or black veneers lies a further technological achievement. While

the original 770 reduced midrange colouration through the use of the

BBC inﬂuenced technique of a thin-wall cabinet damped by mass loading

with bitumen pads, the new 770 features a twin wall sandwich of

high-density MDF and particleboard bonded by a layer of high damping

glue. This results in a cabinet with panel resonance well below audibility,

allowing the drive units to do their job unsullied by cabinet colouration at

all frequencies.

support that aids the dynamic performance of the bass unit and reveals

the micro-dynamics of the musical performance. Finally, the internal

absorption layer of acoustic foam and ﬁbre has been specially chosen

and adjusted to absorb reﬂections inside the cabinet without

overdamping the bass quality.

Director of Acoustic Design

IAG Group Ltd

PETER COMEAU

To repeat the 770’s brochure claims of ‘staggering bass deﬁnition and response;

lack of colouration; uncanny imaging; information retrieval; transient attack; depth

and perspective; accuracy and linearity; speed and dynamic range’ is only to hint

at the real performance of the 770. Instead, we prefer to focus on the 770’s

uncanny ability to reveal the true depth, emotion and drama of whatever music

you care to feed to it.

We are sure you will ﬁnd that a classic design has been reborn.

Important

Safety Instruction

Music Leads,

Technology Follows

Loudspeaker Installation

Warranty Coverage

Technical Data ContentsDesigner's Notes

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