Julian Hirsch Discusses MEASURING DISTORTION IN AMPLIFIERS

148 Pages·2017·22.57 MB·English

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Julian Hirsch Discusses MEASURING DISTORTION IN AMPLIFIERS
Noel Coppage Shows How to Practice the New ART OF DOLLYCOLOGY
EQUIPMENT TEST REPORTS: Empire EDR.9 Phono Cartridge
Garrard DD132 Record Player Kenwuod KR -8050 Stereo Receiver
Koss CM/1020 Speaker System Teac 124 "Syncaset" Cassette Deck
WHAT'S NEW IN AUDIO: the 1979 Summer Consumer Electronics Show
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Stereo Ilevieve
Most speaker companies try to impress with the same materials that were being
you by describing the "wonderful" sound used in 194',.
that comes out of their speakers. Every woofer in the HPM series,
AND IT'S WHAT GOES
At Pioneer, we think the most believable however, is made with a special carbon fiber
way to describe how good HPM speakers blend that's allowed us to decrease the INTO HPM SPEAKERS THAT
are is to tell you what went into them. weight of the cone, yet increase the strength
MAKES THEM SOUND GREAT ON
needed for clarity. So you'll hear the deepest
THE HPM SUPERTWEETER,
SPEAKER TECHNOLOGY RISES TO NEW HIGHS. notes exactly the way the musician recorded EVERY PART OF THE MUSIC,
In many speakers, you'll them.
find that the upper end of the And because every HPM
audio spectrum is reproduced woofer also has an oversized
by an ordinary tweeter. magnet and long throw voice
In HPM speakers, you'll coil, they can handle more
find that the high frequencies power without distorting.
are reproduced by a unique
OTHER FEATURES YOU
supertweeter.
RARELY HEAROE
It works by using a The High Polymer o secular Supertweeter. Every HPM speaker has
So incredible, we named a whole line of speakers after it.
single piece of High cast aluminum frames, in-
Polymer Molecular film, ( hence the name stead of the usual flimsy stamped out metal
I -IPM ) that converts electrical impulses into kind. So that even when you push our
sound waves without a magnet, speakers to their limit, you only
voice coil, cone, or dome. hear the music and never the
And because the HPM frames. In fact, our competitors
supertweeter doesn't need were so impressed, they
any of these mechanical parts, started making what look like
it can reproduce highs die cast frames, but aren't.
with an accuracy and HPM speaker cabinets
definition that surpasses are made of specially com-
even the finest conventional pressed board that has better
tweeter. acoustic properties than ordi-
As an added advantage, nary wood.
the HPM film is curved for You'll never hear a sound out of these Their speakers have level
maximum sound dispersion. die cast aluminum speaker frames. controls that let you adjust
So unlike other speakers, you don't have to the sound of the music to your living room.
plant yourself in front of an HPM speaker to And these features are not just found in
enjoy all the sound it can produce. our most expensive HPM speaker,
but in every speaker in the
MID -RANGE THAT ISN'T
MUDDLED. HPM-1100 HPM series.
For years, speaker man- All of which begins to ex -
ufacturers have labored over plain why, unlike speakers
mid -range driver cones that that sound great on only part
H H
are light enough to give you of the music, HPM speakers
Level controls that let you adjust the sound
quick response, yet rigid enough to your listening area. sound great on all of it. HPM 100
not to distort. At this point, we suggest you take your
Pioneer solved this problem by creating favorite record into any Pioneer Dealer and
special cones that handle more power, and audition a pair of HPM speakers in person.
combine lower mass with greater rigidity. So If you think what went into them
our HPM drivers provide you with cleaner, sounds impressive, wait till you hear what
and crisper mid -range. Which means you'll comes out of them.
hear music, and not distortion.
PIONEER®
WOOFERS THAT TOP EVERY OTHER BOTTOM. We bring it back alive.
Conventional woofers are still made
CIRCLE NO. 85 ON READER SERVICE CARD
C 1978 U.S. Pioneer Electronics Corp., 85 Oxford Drive, Moonachie, N.I. 07074,
T COMES OUT
OF A SP R IS ONLY
AS IMPRESSIVE AS
IT
T GOES I
INTRODUCING THE IEMPIRIE 1E1)119 PI-10NC CARTRIDGIE.
IT SOUNDS AS GOOD ON A RECORD AS IT DOES ON PAPIER.
It was inevitable ... and design specifications-but also our and tear on the record groove.
demanding listening tests-on an equal
With all the rapid developments basis. In effect, it bridges the gap between We could go into more technical de-
being made in today's high fidelity tech- the ideal blueprint and the actual sound. tail, describing pole rods that are laminat-
nology, the tremendous advance in audi- ed, rather than liust one piece, so as to
ble performance it Empire's new EDR.9 The EDR.9 utilizes an L. A. C. (Large reduce losses in the magnetic structure, re-
phono cartridge was bound to happen. Area Contact) 0.9 stylus based upon-and sulting in flatter high frequency response
And bound to come from Empire, as we named after-E I. A. Standard RS -238B. with less distortion. Or how the EDR.9
have been designing and manufacturing This new design, resulting in a smaller weighs one gram less than previous Empire
the finest phono cartridges for over 18 radius and larger contact area, has a phono cartridges, making it a perfect match
years. pressure index of 0.9, an improvement of for today's advance, low mass tonearms.
almost six times the typical elliptical stylus
Until now, all phono cartridges were and four times over the newest designs But more important, as the EDR.9 car-
designed in the lab to achieve certain recently introduced by several other car- tridge represents a rew approach to car-
engineering characteristics and require- tridge manufacturers. The result is that less tridge design, we ask that you consider it
ments. These lab characteristics and re- pressure is appiled to the vulnerable rec- in a slightly different way as well. Send for
quirements took priority over actual listen- ord groove, at the same time extending our free technical brochure on the EDR.9,
ing tests because it was considered more the bandwidth-including the important and then visit your audio dealer and listen.
important that the cartridges "measure overtones and harmonic details. Don't go by specs alone.
right" or "test right"-so almost everyone
was satisfied. That's because the new Empire EDR.9
In addition, Empire's exclusive, pat-
is the first phono cartridge that not only
ented 3 -Element Double Damped stylus
meets the highest technological and de-
Empire's EDR.9 (for Extended Dy- assembly acts as an equalizer. This elimi- sign specifications-but also our de-
namic Response) has broken with this tra- nates the high "Q" mechanical resonances manding listening tests.
IFE
dition, and is the first phono cartridge that typical of other stylus assemblies, produc- Empire Scientific Carp
not only meets the highest technological ing a flatter response, and lessening wear Garden City,N.Y.11530
(ISSN 0039-1220)
eview
SEPTEMBER 1979 VOLUME 43 NUMBER 3
tfie 'Equipment
NEW PRODUCTS
Roundup of the latest audio equipment and accessories 17
AUDIO NEWS
A Digitally Encoded Audio Disc GARY STOCK 28
AUDIO QUESTIONS AND ANSWERS
Crossover Design. Flat Response, Car -speaker Equalizer, Jammed Cassettes LARRY KLEIN 30
AUDIO BASICS
The Dawn of Digital RALPH HODGES 34
TAPE TALK
The Dolby HX System CRAIG STARK 38
TECHNICAL TALK
Modified Amplifier Distortion Measurements JULIAN D. HIRSCH 45
EQUIPMENT TEST REPORTS
Hirsch -Houck Laboratory test results on the Koss CM/1020 speaker system,
Kenwood KR -8050 stereo receiver, Garrard DD132 record player, Empire EDR.9
phono cartridge, and Teac 124 "Syncaset" cassette deck JULIAND. HIRSCH 46
WHAT'S NEW IN AUDIO
Cataloging the miles of aisles at the 1979 Summer Consumer Electronics Show RALPH HODGES 70
cW1usic
DOLLY
Dollycologists must sift Miss Parton's words carefully for insights NOEL COPPAGE 82
BEST RECORDINGS OF THE MONTH 86
Burt Bacharach's "Woman" 87 Emmylou Harris' "Blue Kentucky Girl" 89
Patti Austin at the Bottom Line 88 Massenet's Cendrillon 89
Benjamin Britten's Spring Symphony 88 R. Strauss' Ein Heldenlebesi 90
CLASSICAL DISCS AND TAPES 92
Zimerman: Irresistible Chopin 93 Glass: Einstein on the Beach 100
Derails Persuasive Bartok 96 Mozart: Idomeneo 104
Phantasmagoria Musica 98 British Music: The Pastoral Tradition 108
POP ROTOGRAVURE STEVE SIMELS 110
POPULAR DISCS AND TAPES 112
The Who Are Alright 113 Nana Mouskouri 124
Queen Bea 114 Whatever Happened to Four-part Harmony? 128
Dolly: Crossin' Over Is Hard to Do 118 Anita O'Day: Big -band Harvest 134
-,e-ecitgulars
BULLETIN WILLIAM LIVINGSTONE 5
SPEAKING OF MUSIC WILLIAM ANDERSON 6
LETTERS TO THE EDITOR 10
SIMELS LIVE STEVE SIMELS 64
GOING ON RECORD JAMES GOODFRIEND 66
ADVERTISERS' INDEX 146
COVER: Illustration by Bob Deschamps.
COPYRIGHT ©1979 BY ZIFF-DAVIS PUBLISHING COMPANY. All rights reserved. Stereo Review, September 1979. Volume 43. Number 3. Published
monthly by Ziff -Davis Publishing Company; Editorial and Executive Offices at One Park Avenue. New York, N.Y. 10016. Telephone: [phone]. Philip B.
Korsant, President; Furman Hebb. Executive Vice President; Selwyn Taubman, Treasurer; Philip Sine, Secretary. Also publishers of Boating, Car and Driv-
er. Cycle. Flying. Popular Electronics. Popular Photography. Psychology Today, Skiing, Stereo Directory, and Tape Recorder Annual. One-year subscrip-
tion rate for U.S. and possessions. $9.98; Canada. $10.98. All other countries, one-year subscription rate $14.98, cash orders only, payable in U.S. currency.
Second-class postage paid at New York. N.Y. and at additional mailing offices. Authorized as second-class mail by the Post Office Department. Ottawa, Can-
ada. and for payment of postage in cash. SUBSCRIPTION SERVICE: Forms 3579 and all subscription correspondence should be addressed to Stereo Re-
view. Circulation Department, P.O. Box 2771, Boulder. Colorado 80323. Please allow at least eight weeks for change of address. Include your old address as
well as new-enclosing if possible an address label from a recent issue. Material in this publication may not be reproduced in any form without permission.
Requests for permission should be directed to Jerry Schneider. Rights and Permissions. Ziff -Davis Publishing Co., One Park Avenue, New York, N.Y. 10016.
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CIRCLE NO. 18 ON READER SERVICE CARD
Stereo Review
11110/1111111
Edited by William Livingstone
RADIO -RECEIVER PERFORMANCE RATINGS to in September...The second effort from
assist consumers in choosing a radio rock's premier dada-ist, Tonio K., will
have been proposed by the National be "Cars, Guitars, and Teenage Violence"
Association of Broadcasters (NAB). The ...And Pete Townshend is readying a solo
proposal suggests that manufacturers of LP (his first on Atco) to coincide with
AM and FM radio receivers submit samples the Who's first U.S. appearances since
of their products to the NAB or to an the death of Keith Moon and with the
independent laboratory which would test group's feature -film version of their
them for performance quality and award "Quadrophenia" album, starring Sting,
one of three grades --A, B, or C. The front man of the Police.
proposal was made to the Electronic
Industry Association at this summer's THE WORLD OF OPERA series on National
Consumer Electronics Show in Chicago to Public Radio continues through September
encourage manufacturers to participate with performances of Thomas Pasatieri's
in formulating measurement standards. Washington Square, Handel's Poro, Baber
and Gardner's Rumpelstiltskin, Verdi's
RY COODER'S ALBUM "BOP TILL YOU DROP" Simon Boccanegra, Sessions' Montezuma,
(Warner Bros. BSK 3358) was recorded on and Britten's Paul Bunyan. Dates and
3M digital equipment at Warner's Los times of broadcast vary. Check local
Angeles studios. The company claims that NPR stations.
it is the first multitrack pop album to
be.digitally mastered by a major label. ESPRIT IS THE BRAND NAME SONY HAS GIVEN
Says Cooder, "For the first time I was a new line of luxury (nothing under $500)
hearing back exactly what I played. audio products introduced in Tokyo in mid
Digital gives range. Any musician would July. Included is the APM-8 loudspeaker
be knocked out by the fullness of it." with "accurate pistonic motion" specially
designed for use with PCM adapters and
LOUISVILLE ORCHESTRA FIRST EDITION PCM recordings. Incorporating new design
RECORDS, until recently available only elements and materials --a ribbon tweeter,
by subscription, are now sold retail by separate midrange, a flat honeycomb
Composers Recordings, Inc. List price: woofer, and sophisticated new crossover
$7.98. Celebrating its 25th anniversary, network --its price will be (hold onto
CRI offers its mail-order customers one your hat) over $5,000 per speaker.
free CRI recording for every four bought
at the regular $6.95 price. Write CRI, RECORDED READINGS OF BEST SELLERS are
170 West 74th St., New York, N.Y. 10023. available to motorists whose cars are
equipped with cassette players. Books on
THE "MAKER OF THE MICROPHONE" AWARD Tape rents recordings of books by such
for this year has been presented to 3M's authors as Isaac Asimov, Erma Bombeck,
Mincom Division for "an outstanding Charles Dickens, Kurt Vonnegut, and more
contribution to the world of sound," the than 100 others. Books are recorded in
development of a practical digital audio their entirety on a series of cassettes
recording system with electronic editing mailed as sets. Rental fees (averaging
capabilities. The award is presented $7.50 for thirty days) include postage
annually in memory of Emile Berliner, for delivery and return. For a free
whose inventions include the microphone, catalog write Books on Tape, Box 71405,
the disc record and record player, and Los Angeles, Calif. 90071. Someone has
methods of mass producing discs from a obviously given a little thought to
single master. Among former winners of what to do while waiting in a gas line.
the "Mike" award are the late Peter
Goldmark, who developed the long-playing PONCHIELLI'S LA GIOCONDA, performed by
record, and Dr. Ray Dolby (details of the San Francisco Opera Company, will be
his new "HX" headroom -extension system telecast live via satellite September 16
are covered in this month's Tape Talk). throughout North America and Europe,
and stereo simulcast will be available.
WORKS IN PROGRESS: Bob Seger's follow Renate Scotto and Luciano Pavarotti head
up to the platinum "Stranger in Town" is the cast. For time, check local listings
to be titled either "No Man's Land" or of the Public Broadcasting Service or
"Fire Lake" and is scheduled for release the Canadian Broadcasting Corporation.
September 1979
anything and who need satisfy only them-
Speaking of music selves if they do.
There is, however, a bit more to it than
that. At Broadcast Music Inc.'s award cere-
monies for young American composers re-
cently, I met a young Californian whose
prize-winning one -movement piano concerto
had its genesis in a college composition class.
The composer, still a bit awed by his own te-
merity in undertaking so grand a project, con-
fessed that he had not had the courage to own
up to it before his classmates, who were all
confining their efforts to humble little sonati-
nas and string trios, but had asked to discuss
the matter with his professor after class.
Whether you call that painful self-conscious-
ness or becoming modesty, it too is a part of
the "circumstances" of modern composing.
And so, composers are not "hungry"
enough; they are so insulated from economic
pressures that they need compose only what
they want to. They are also self-conscious,
often too vulnerable (thanks to the ubiquitous
ADVICE TO YOUNG COMPOSERS print and electronic media) to the news of
what their peers are up to all over the world to
set down a single note. And finally, more than
set of circumstances," a reader days" while practicing their art in drafty gar- the rest of us, they must deal with radical
"WHAT
wants to know, "produced the great rets (I speak, of course, metaphorically), but egalitarianism, that misreading of the whole
composers of the past, and why don't we lately they are nourished by an apparently in- idea of Democracy that would have us believe
have those circumstances now?" One is exhaustible cornucopia of stipends, grants, that Beethoven was an "elitist," that the only
tempted to be brutally direct about it and an- and "in residences" that make even a mo- way to be equal is to be the same.
swer, to the first part, that the circumstances mentary pang unlikely. And there is still such What, then, is a young composer to do? He
were talent, hunger, and patronage, and to the a thing as patronage, though its nature is should not, first of all, teach at a university;
second part that although there is probably no significantly altered: where it once was an ex- he should get a job in insurance and compose
shortage of any of these three today, they are pression of personal taste (Keyserling, Ra- on the side. He should sell his record player,
not being taken advantage of at all or are be- soumovsky, Esterhazy, Brandenburg), it has TV, and radio-and move to New Zealand, if
ing used in unfruitful ways. become an exercise of corporate whim, a cul- necessary, to avoid modern -music concerts
As far as the talent is concerned, we must tural reflex on the part of foundations, institu- and other composers. He should avoid giving
assume, in the absence of evidence to the tions of higher learning, or of government that his compositions fancy Greek titles, calling
contrary, that no catastrophic genetic fire- causes them to commission a bit of music them simply "symphony," "concerto," and
storm wiped all propensity toward musical from time to time with no more concern or "quartet" instead. He should not set to music
composition out of the human race right after, personal involvement thar if they were order- any fragment of Lao-tse or quatrain of Lor-
say, Richard Wagner; it is still there waiting to ing so many yards of bt.nting to camouflage ca. He should read Milton's Lycidas and dare
be put to work. Hunger, too, even for com- the underpinnings of a platform. All of which to be arrogant. I can't guarantee that the re-
posers, has hardly been eliminated, but these leaves us with a lot of musical talents whose sult will be a great composer, of course; the
days it is usually circumvented: composers comfortable academic sinecures make it un- method hasn't even been tried, as far as I
once "scorned delights and lived laborious likely that they will ever have to compose know, since Charles Ives.
Stereo Review CONTRIBUTING EDITORS Japan: James Yagi
CHRIS ALBERTSON IRVING KOLODIN Oji Palace Aoyama, 6-25, Minami Aoyama
EDWARD BUXBAUM PAUL KRESH 6T-eClehpohmoen,e M: 4in0a7to-1-k9u3,0 T/8o8k2yo1,, 5J8a2p-a2n851
PUBLISHER NOEL COPPAGE STODDARD LINCOLN
EEWDDILIGTLAOIARRM WI NA. NCHDHOEIPERPFSEORN RPRDHIOACYVBHLIEDA RG RHTADA RN LFL.LR AGENREDEDENE JRLP IEIMNCTCAKERO RMKL IRNSTEZ- PHILEIGLRYHRWYATER CPEre.DitrOucIT.ru nOBla poRtixooI Asn2t L7aO 7gCf1efOi,c aeNBnoTduR wldIBiellUr ,bT CeI OohlNaonrSad dmleoud 8s w0t 3bit2he3 raecacsoomnpaabnleie cda brey;
EXECUTIVE EDITOR however, publisher assumes no responsibility for the re-
WILLIAM LIVINGSTONE ROY HEMMING CHARLES RODRIGUES turn or safety of art work, photography, or manuscripts.
JULIAN D. HIRSCH ERIC SALZMAN
MANAGING EDITOR GEORGE JELLINEK CRAIG STARK Member Audit Bureau of Circulations
LOUISE GOOCH BOUNDAS IGOR KIPNIS JOEL VANCE w
ART DIRECTOR
BORYS PATCHOWSKY LONDON EDITOR 'Kw
TECHNICAL DIRECTOR HENRY PLEASANTS
LARRY KLEIN ADVERTISING DIRECTOR
TECHNICAL EDITOR JAMES J. SULLIVAN
RASASLPISHT AHNOTD GTEECSHNICAL EDITOR ALIDNVDEAR BTLIUSIMNG SERVICE MANAGER ZPFIuhFriFlmip-Da BnA. HVKIeoSbr sbPa,U nEBtx, LePIcSrueHtsivIidNee GVn tiCceO PMrPesAidNeYnt
GARY STOCK EXECUTIVE ASSISTANT Phillip T. Heffernan, Sr. Vice President
MUSIC EDITOR PEGI McENEANEY Edward D. Muhlfeld, Sr. Vice President
JAMES GOODFRIEND Philip Sine, Sr. Vice President, Secretary
POPULAR MUSIC EDITOR Editorial and Executive Offices RLiacwharerdn cFer iSespeo,m S, rS. Vr. icVeic Pe rPesreidseidnetnt, Circulation and Marketing
PAULETTE WEISS Ziff -Davis Publishing Company Baird Davis, Vice.President, Production
SPECIAL PROJECTS EDITOR One Park Avenue, New York, New York 10016 George E. Morrissey, Vice President
STEVE SIMELS 212 725-3500 Sydney H. Rogers, Vice President
ASSISTANT MUSIC EDITOR NEaastitoenranl AAddvveerrttiissiinngg RMeapnraegseenr:t aRtiicvhea: rCdh Ja.r lHeas lpLe. rPn. Watson SAildbneerty S H. oTlrtaz,in Vai,c Ve iPcere Psrideesnidtent
VIVIENNE WINTERRY GOODMAN Paul H. Chock, Vice President
PRODUCTION EDITOR Midwestern Office: The Pettis Group Edgar W. Hopper, Vice President
JOHN HARRISON 4761 West Touhy Ave., Lincolnwood, Illinois 60646 Robert N. Bavier, Jr., Vice President
ASSISTANT EDITOR, RESEARCH A3r1n2o l6d7 S9-. 1H1o0f0fman Selwyn Taubman, Treasurer
RICHARD SARBIN W. Bradford Briggs, Vice Chairman
COPY EDITOR Western Office
DAVID STEIN 9025 Wilshire Boulevard ZIFF CORPORATION
Beverly Hills, California 90211 William Ziff, Chairman
EDITORIAL ASSISTANTS 213 273-8050; 272-1161 I. Martin Pompadur, President
BARBARA AIKEN, SHEILA DWYER Western Advertising Manager: Jane LeFevre Hershel B. Sarbin, Executive Vice President
6 STEREO REVIEW
Ahh. Decisions, decisions.
Metal, three heads, microcomputer.
Auto reverse, detachable remote, logic.
We don't want to complicate your as a detachable remote control unit. There's more. A Record Mute,
specs life but Sony gives you in- Recording and playback is Sony large VU meters with LED peak
spiring cassette decks. There's one precise with two newly developed level indicators, Memory, Timer
exactly right for you. BSL (Brushless & Slotless) motors. switch, MIC and LINE input controls
Consider our new, three -head, Simplified tape transport assures and Headphone level control work
two motor TC-K75 that gives you constant tape speed for faithful together to give you impressive value.
the higher-fi of metal tape compati- reproduction. The Sony TC-K75 and the Sony
bility. That's in addition TC-K96R. Your decision?
to regular-fi, chrome Either way you win.
and FeCr settings.
And Bias
Calibration and
Record Level ntc (EY, ta-1,4
Calibration
systems let you
optimize the
performance
of the specific TC-K75
tape you use.
The profes-
sional three -
head system
monitors the recorded
signal an instant after
it's recorded. And
individual heads
for each function,
record, playback
and erase, signifi-
cantly improve
performance.
Sony's new
microcomputer in
the heart of the
TC-K75 adds conve-
nience and dramatically increases
reliability. The control unit snaps off to
Digital logic control lets you speed become a remote control unit for
through any sequence of operations convenient
by merely pressing the appropriate operation at
feather -touch bar. distances up to
The Ferrite -and -Ferrite heads last five meters.
virtually forever.
Compared to a
conventional
permalloy head,
Sony's F&F head
lasts 200 times
longer. Micro -
polished, ultra -hard ferrite both in
the magnetic core and guard portions
delivers excellent frequency response
and a high signal-to-noise ratio.
Another decision: Sony's TC-K96R
cassette deck offers the double con-
venience of auto -reverse
ruled by a micro- SONY®
computer as well
CIRCLE NO. 59 ON READER SERVICE CARD
Recent developments have revolu- METAL TAPE. Another of the
tionized tape technology. The new marvelous innovations is metal tape.
Fisher CR4029 cassette deck, with Why has it become so important?
an array of features you thought were Our chart shows why. Metal tape
still in the future, can now make demonstrably improves frequency
recordings in your home that rival response. Combine it with the new
the product of professional studios. high speed and you'll get a hard -to -
Equally important, the CR4029 offers believe 30Hz-25kHz ± 3 dB fre-
a wide range of choices that, until quency response with virtual freedom
now, were unavailable. Some of the from distortion. You'll also be able to
THIS REMARKABLE
new cassette decks offer one or two record at higher levels. (With normal
of these technological innovations- tape and standard speed, you have
CASSETTE DECK Fisher offers them all in one inte- to record at lower levels to prevent
grated package. tape saturation and consequent dis-
TWO SPEED OPERATION. tortion.)
COULD ONLY You can use the CR4029 at the stan- CR4029 FREQUENCY RESPONSE
dard 17/8 ips speed and you'll have ,...-----
COME FROM outstanding recordings. But that's Metal Particle TapeI at 1 7/8 ips (-20VU)-\\
just the beginning. Switch to the new Typical response 30Hz -18kHz
high-speed 33/4 ips and the CR4029 'r --Normal Tape at33/4 ips (-20VU) s'\
THE NEW FISHER. delivers an incredible 30Hz-20kHz Typical response 30Hz-20kHz
± 3 dB frequency response (using 30Hz 1000Hz 20kHz 25kHz
normal tape). What's more, record- THREE VHT/SENDUST
ing at high speed drastically reduces HEADS WITH DUAL PROCESS
wow and flutter and tape dropout. Off - DOLBY. All this new technology
the -air and off -the -disc recordings requires new recording, playback
will astound you, and even surprise and erase heads. So Fisher engineers
your friends who own reel to reel came up with our new VHT heads.
recorders. (Since a C90 cassette will Made of a special micro -fine, high
record a full album at 33/4 ips, high density particle formulation, they
speed recording is still economical.) bring out the best potential of metal
But-there's more. tape and high speed. Because the