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~KENWOOC DOLBYIZED STEREO CASSETTE DECKS

KX-1030

The Kenwood KXI030 Stereo Cassette Deckincorporates the most advanced technology

in the field of cassette deck design.The KX-1030 achieves electrical and performancecharacteristics equal to, or better than those ofany cassette deck available today at any price.The extraordinary performance of this cassettedeck is a direct result of the many years ofresearch and development of dedicated Kenwoodengineers, and their desire to achieve a level ofperformance that goes far beyond the state-of-the-art.Consider just one performance feature of theKX-1030.There exist a number of cassette deckswhich incorporate "three-head" design for the

~ KENWOOD STEREO CASSETTE DeCK MODEL KX-l030

f.POWER

THREE FERRITE HEADSFULL AUTO 51 KIT OF'"

purpose of monitoring recordings directly fromthe tape as they are being made. The KX-1030provides for such instant playback of recordings,but Kenwood engineers have incorporatedindependent record and playback heads for thispurpose, thereby achieving a performance levelnot possible with dual-purpose combinationrecord/playback heads. As a result, the KX-1030provides extended frequency response, widerdynamic range and higher saturation levels-performance qualities that are indispensable forhigh quality tape reproduction.

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"Flat Drive Belt;'-- The Key ToFurther Improvement In Wow-And-Flutter

vibration, Kenwood engineers decidedto incorporate two separate belts: onesolely for driving the capstan; the otherfor driving the take-up reel. As a resultof this two-belt system, the KX-I030provides low wow-and-flutter as well asaccurate and stable rotation of thecapstan, regardless of tape accumulationon the take-up reel of the cassette.

Ordinary one-belt drive system

! Motor pulley

Take-upreel,Feed;ng,C§)

Kenwood's two-belt drive system

Capstan Roundness Accuracy -The Final Step In Reducing Wow-And-Flutter

The capstan used in Kenwood's KX-1030 is machined to the critical round-ness tolerance of 0.1 microns, thusreducing another important cause ofwow-and-flutter. The capstan roundnesschart illustrated here indicates clearlythe degree of roundness achieved inKenwood capstans.Capstan accuracy must be maintainedindefinitely, and not only when thecassette deck leaves the factory. Inorder to maintain this built-in accuracy,Kenwood engineers have incorporated atriangular capstan support system. Thisthree-point support (as opposed tosingle or dual-support systems used by

other manufacturers) can withstandshocks from any direction withoutaffecting the mechanical stability of thecapstan system. Thus, long term relia-bility and low wow-and-flutter per-formance are assured through manyyears of continued use.

The drive .system used to transfer rota-tional energy from the motor to theflywheel can be used to further reduceundesirable wow-and-flutter. A roundcross-sectional type of belt, such as thatused in most cassette decks, does notprovide sufficient contact surface to beused in a precision cassette deck such asthe KX-I030. In' order to reduce slip-page and vibration caused by the subtle,irregular motion that takes place be-tween the flywheel and the drive belt,Kenwood engineers elected to use a flatbelt having a width of 5 millimeters.This belt not only reduces slippagebecause of its large contact surface, butalso absorbs vibration caused by theirregular motion inherent in theremainder of the drive system.Unlike flywheels with V-grooves gougedinto their surfaces, the flat, polishedsurface of the flywheel used in theKX-I030 provides exact concentricityrequired for precise rotation. Suchaccurate roundness is difficult if notimpossible to achieve with conventional,V-grooved flywheels.

Flywheelwith V·Shaped Groove

KX-1030Flywheel

Kenwood's triangular capstan shaft support.

Capstan Roundness Chart

A Double Dolby SystemBecause the record amplifier and play-back amplifier of the KX-I030 arecompletely independent of each otherin order to accommodate simultaneoustape monitoring in the three-headsystem, separate Dolby encode anddecode circuits have also been incorpo-rated. Each of the four circuits involvedis therefore precisely calibrated toperform its assigned function.

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Tape. Double Dolby System

Vertical Tape Transport UsingIndependent Belt Drive SystemFurther Improv~s The Wow-And-Flutter Characteristics Of TheKX-I030

In most cassette decks employing asingle-motor drive, one belt is used todrive the tape as well as the take-up reel.In such systems, so long as there is notape on the take-up reel side, the cap-stan drive system operates withoutinterruption. However, as tape accumu-lates on the take-up side, irregularitiesor "bumps" in the action of the take-upreel may affect the operation of thecapstan drive.In order to reduce wow created by such

Bias And EqualizationThe recent proliferation of differentcassette tape formulations used inbetter-quality tape cassettes makes itmandatory that a high-quality cassettedeck be equipped to handle all of thevarieties of tape available. In addition toproviding separate bias and equalizationswitches on the KX-I030 (each withthree positions, for a total of ninepossible bias/equalization permuta-tions), Kenwood engineers have in-cluded a bias adjustment control, on thefront panel of the instrument.Variationsin tape formulations, even within thethree basic categories of tape (normal,ferri-chrome and chrome) are such thattrue optimization of bias can only beachieved by precise adjustment. To aidin this adjustment, a built-in oscillatorhas been included in the electronicsection of the KX-I030. Two separatefrequencies are produced by this oscil-lator and the test recording can beadjusted by means of the variable biasadjustment control so that frequencycharacteristics are "flat". Proper, preciseadjustment of bias in this manner alsooptimizes sensitivity and signal-to-noiseratios obtained with any given tapeused.

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Types of Tapes and Positions ofTape Selector (Bias and Equalizer)

TYPE OF POSITIONSMAKER TAPE NORMAL RESERVE CHROME

TDK D ·SD ·M ·MAX ELL LN ·UD ·UO-XL I ·SONY ·HF ·FUJI FL ·FX ·SCOTCH LD ·LH ·8ASF LH ·LHS ·AGFA LH ·SHD ·SONY FERRI CHROME ·SCOTCH CLASSIC ·BASF FeR ·All makers c-o, ·TDK SA ·MAX ELL UD·XL II ·

Additional Features And HighlightsOf The KX-I030

All of the features you would expectfrom a top-performing cassette deck arepresent in the KX-I030 - and more! Apeak indicator illuminates when instan-taneous levels of recording exceed+6 dB, even when such signals are fartoo fast to be registered on the ac-companying VU record level meters.

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Memory rewind is included, for auto-matic rewind to predetermined portionsof a tape, as are independent line-inputand microphone-input level controls forprofessional mixing and control.

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The expanded scale VU meters (-20 to+5 VU) are easier to read and providewider dynamic range indications. Soft-touch lever operated controls make theKX-I030 extremely easy to use and thefront panel layout is designed withspecial emphasis on effortless, fingertipoperation. Even Kenwood's unique 2-way cassette door system offers advan-tages to the user. Combined with front-loading and upright mechanical designof the transport system, the doormechanism includes the tape holder andthe door itself can be easily removedfrom the deck so that mechanical opera-tion of the cassette can be fullyobserved and, when no cassette is insert-ed, magnetic heads, capstan and pinchroller are all easily accessible for clean-ing and maintenance.* Dolby is a trademark of Dolby

Laboratories, Inc.

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How Kenwood Engineers DesignedThe New KX-1030 With ExtendedFrequency Response, Lower Noise %

And Lower Distortion Using AThree-Head Design

inches). It is this minute and optimumgap width that is largely responsible forthe extended frequency range and widerdynamic range of this cassette deck. Inaddition, the depth of the head gap ismaintained at 100 microns for higherplayback sensitivity.

grams-em". Only when one comparesthis with the kinetic energy of rotationof conventional decks - which rangesfrom 600 to 1700 grams-em? - can onefully appreciate the importance of themassive flywheel used in the KX-1030.As a result of this high kinetic energy,flutter (perceived audibly as a rapidwarbling of recorded sound), and wow(perceived as a slower wavering ofmusical pitch caused by mechanicalvariations in the tape drive system) havebeen reduced to the low level normallyfound in high quality open-reelmachines.

• •Wow & Flutter Characteristics

High Power, High Torque DC ServoMotor

While the use of a large flywheel in acassette deck's transport system con-tributes significantly to stable andaccurate rotation of that drive system,driving such a heavy flywheel requires amotor with high rotational torque.Kenwood engineers have incorporated amotor with a rotational torque of 50gram centimeters in the KX-1030 -compared with approximately 20 gramcentimeters of torque provided by themotors used in many other cassettedecks. Another important feature ofthis well designed DC servo motor isthat a sudden increase in load (oftenencountered in cassette drive systemswhen less-than-perfect cassette tapehousings are used) has a negligible effectupon the stability of the tape drivesystem.

Although some dual purpose record/playback heads incorporated in conven-tional cassette decks provide good per-formance, the use of combination headsto record and reproduce tapes impose alimitation in terms of frequency re-sponse and dynamic range.The most important factor that deter-mines recording and playback responseis the gap width of the head. Forexample, the gap width of a playbackhead is a critical factor in determiningthe high-frequency capability of cassettedecks. A signal recorded on tape may bethought of as having a wavelength whichis inversely proportional to its frequen-cy. As the signal frequency increases, itswavelength becomes shorter andshorter. When the wavelength to berecorded approaches the width of theplayback head gap in length, the play-back head can no longer produce anoutput, and response falls off drasticallyat that point.

Ordinary Rec./P.B. Head (Wide Gap Width)

The Kenwood dual combinationrecord/playback head

Frequency Responseof Rec. Head UsingVarious Gap Widths

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Output vsDistortion of Rec. Head UsingDifferent Gap Widths

A Precision Die-Cast Zinc AlloyFlywheel With A Mass Of 150Grams Provides Greater Inertia AndMore Accurate Tape Motion

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KX-1030 Playback Head (Narrow Gap Width)

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. In order to extend the frequency range,the gap width of the playback head usedin the KX-1030 is held to less than 1.5microns (a micron is equal to 0.00004

Another aspect of the extraordinaryperformance of the new KX-1030 arisesfrom its ability to provide accurate,constant rotation of the tape capstanshaft - the most important element indriving the tape. Kenwood engineersrecognized that the tape-drive motoralone cannot absorb speed variations inthe tape drive system. Accordingly, theyincorporated a massive flywheel (with aweight of 150 grams) to increase kineticenergy of rotation to a high 5,460

SPECIFICATIONSType ..... Built-in Features . Three Ferrite Heads,Dolby Noise

Reduction System with Indicator,Three Position Bias Selector (Normal-Chrome-Reserve),Three Position Equalization Selector(Norrnal-Chroms-Reserve},Fine Bias Adjustment Controls withOscillator,Full Auto Shut-Off Mechanism in AllModes,Mic/Line Mixing,Memory Rewind,LED Peakand Recording Indicator,Tape Monitor,Three Digit Tape Counter,Two LargeSize Illuminated VU Meters,Two Microphone Jacks, HeadphoneJack,DIN Rec/ Play ConnectorAC 120V, 60 Hz - USA & Canada ModelAC 220V, 50 Hz - Australia ModelAC 240V, 50 Hz - U.K. ModelAC 120V/220V (Switchable},50/60 Hz - Other Countries13.0 wattsW16-15/16" (430mm)H6-9/16" (167mm)013-1/16" (332mm)7.5 kg (16.5 lbslStereo Connection Cord x 2Head Cleaning Kit x 1Normal; TDK SD-C90Chrome; TDK SA-C60Reserve; SONY DUAD C-60

Track System

Recording System.

ErasingSystemTape Speeds.Heads .

Motor.. . .Fast Winding Time ..Frequency Response

Normal Tape.

Cr02 Tape ..

Ferri-CrOs Tape.

Signal-to-Noise Ratio*Dolby ON (Over 5 kHz)

DOlby OFF ..Harmonic Distortion.

Wow & Flutter .Input Sensitivity /1mpedance

LINE x 2 .

DIN xl .....

Microphones x 2Output Level/Load Impedance

LlNEx2.DIN xl .....Headphonesxl.

Front Loading Stereo CassetteDeckwith Dolby' System4-Track 2-Channel Stereo/MonoRecording/PlaybackAC Bias System (Bias Frequency:85 kHz)AC System4.76 cm/sec. (1-7/8 ips)Three Ferrite HeadsRecording and Playback Dual CombinationHead x 1Erasing Head x 1Electronically Controlled DC MotorApprox 80 Secondswith C-60 Tape

25 Hz to 17,000 Hz,(35 Hz to 15,000 Hz ±3 dB)25 Hz to 20;000 Hz,(35 Hz to 18,000 Hz ±3 dB)25 Hz to 19,000 Hz,(35 Hz to 17,000 Hz ±3 dB)

65 dB (Normal Tape), 67 dB (Cr02)55 dB (Normal Tape), 57 dB (Cr02)Lessthan 1.3%(at 1 kHz, OVU with Normal Tape)0.06% (WRMS)

77.5 mV/56 k ohms0.1 mV/1.0 k ohms-

Europe & Scandinavia model10.9 mV/l.5 k ohms-Other Countries model0.19 mV/l0 k ohms

775 mV (OVU)/2.0 k ohms775 mV (OVU)/2.0 k ohms48.9 mV/8 ohms to 16 ohms

Walnut veneer finish side panels B-lO (optional)

Power Rquirements .

Power ConsumptionDimensions .....

Weight. . .Supplied Accessories.

Reference Tape* ...

Kenwood follows a policy of continuous advancements in development.For this reasonspecifications may be changed without notice.

*NOTE: Dolby is trademark of Dolby Laboratories, Inc.

Carrying handles D-IO (optional)

$KENWOODKENWOOD ELECTRONICS, INC.1315 E. Watsoncenter Rd, Carson, California 90745;75 Seaview Drive, Secaucus, New Jersey 07094,In Canada: Magnasonic Canada, Ltd.

C-714-K 7n233SA Printed in Japan