The Kenwood KXI030 Stereo Cassette Deck incorporates the most advanced technology in the field of cassette deck design.

Transcription

1 ~KENWOOC DOLBYZED STEREO CASSETTE DECKS KX-1030

2 The Kenwood KX030 Stereo Cassette Deck incorporates the most advanced technology in the field of cassette deck design The KX-1030 achieves electrical and performance characteristics equal to or better than those of any cassette deck available today at any price The extraordinary performance of this cassette deck is a direct result of the many years of research and development of dedicated Kenwood engineers and their desire to achieve a level of performance that goes far beyond the state-ofthe-art Consider just one performance feature of the KX-1030 There exist a number of cassette decks which incorporate "three-head" design for the purpose of monitoring recordings directly from the tape as they are being made The KX-1030 provides for such instant playback of recordings but Kenwood engineers have incorporated independent record and playback heads for this purpose thereby achieving a performance level not possible with dual-purpose combination record/playback heads As a result the KX-1030 provides extended frequency response wider dynamic range and higher saturation levelsperformance qualities that are indispensable for high quality tape reproduction ~ KENWOOD STEREO CASSETTE DeCK MODEL KX-l030 DOl OOLBV$YSTEM DOUBLE DOLBY av$te""" POWER f _20~10\5J~-+s BAS ADJ _"1- TAPE SELECTOR i BAS EOUAlZER vu en left-@-~ght THREE FERRTE HEADS FULL AUTO 51 KT OF'" r=':': M~C - NPUT - L~E " / '\ 6 o '0 o OF" SOURCE OUTPUT 01 / '- - ~LEn MC 0' \0 "9 ~ Q!GHT

3 "Flat Drive Belt;'-- The Key To Further mprovement n Wow-AndFlutter The drive system used to transfer rotational energy from the motor to the flywheel can be used to further reduce undesirable wow-and-flutter A round cross-sectional type of belt such as that used in most cassette decks does not provide sufficient contact surface to be used in a precision cassette deck such as the KX-030 n' order to reduce slippage and vibration caused by the subtle irregular motion that takes place between the flywheel and the drive belt Kenwood engineers elected to use a flat belt having a width of 5 millimeters This belt not only reduces slippage because of its large contact surface but also absorbs vibration caused by the irregular motion inherent in the remainder of the drive system Unlike flywheels with V-grooves gouged into their surfaces the flat polished surface of the flywheel used in the KX-030 provides exact concentricity required for precise rotation Such accurate roundness is difficult if not impossible to achieve with conventional V-grooved flywheels vibration Kenwood engineers decided to incorporate two separate belts: one solely for driving the capstan; the other for driving the take-up reel As a result of this two-belt system the KX-030 provides low wow-and-flutter as well as accurate and stable rotation of the capstan regardless of tape accumulation on the take-up reel of the cassette Ordinary one-belt other manufacturers) can withstand shocks from any direction without affecting the mechanical stability of the capstan system Thus long term reliability and low wow-and-flutter performance are assured through many years of continued use drive system! Motor pulley Take-upreel Feed;ngC ) Kenwood's Kenwood's two-belt triangular capstan shaft support drive system Capstan Roundness Flywheel with V Shaped Groove KX-1030 Flywheel Vertical Tape Transport Using ndependent Belt Drive System Further mprov~s The Wow-AndFlutter Characteristics Of The KX-030 n most cassette decks employing a single-motor drive one belt is used to drive the tape as well as the take-up reel n such systems so long as there is no tape on the take-up reel side the capstan drive system operates without interruption However as tape accumulates on the take-up side irregularities or "bumps" in the action of the take-up reel may affect the operation of the capstan drive n order to reduce wow created by such Chart A Double Dolby System Capstan Roundness Accuracy The Final Step n Reducing WowAnd-Flutter The capstan used in Kenwood's KX1030 is machined to the critical roundness tolerance of 01 microns thus reducing another important cause of wow-and-flutter The capstan roundness chart illustrated here indicates clearly the degree of roundness achieved in Kenwood capstans Capstan accuracy must be maintained indefinitely and not only when the cassette deck leaves the factory n order to maintain this built-in accuracy Kenwood engineers have incorporated a triangular capstan support system This three-point support (as opposed to single or dual-support systems used by Because the record amplifier and playback amplifier of the KX-030 are completely independent of each other in order to accommodate simultaneous tape monitoring in the three-head system separate Dolby encode and decode circuits have also been incorporated Each of the four circuits involved is therefore precisely calibrated to perform its assigned function Play Head AEC Head Erase " p 8 EQ AM P --[:::>--1 ~~ BAS Tape PBDolby ~OutPut REC EQ AMP '" 0"" ~ ose Double Dolby System ---0 nput

4 Bias And Equalization The recent proliferation of different cassette tape formulations used in better-quality tape cassettes makes it mandatory that a high-quality cassette deck be equipped to handle all of the varieties of tape available n addition to providing separate bias and equalization switches on the KX-030 (each with three positions for a total of nine possible bias/equalization permutations) Kenwood engineers have included a bias adjustment control on the front panel of the instrumentvariations in tape formulations even within the three basic categories of tape (normal ferri-chrome and chrome) are such that true optimization of bias can only be achieved by precise adjustment To aid in this adjustment a built-in oscillator has been included in the electronic section of the KX-030 Two separate frequencies are produced by this oscillator and the test recording can be adjusted by means of the variable bias adjustment control so that frequency characteristics are "flat" Proper precise adjustment of bias in this manner also optimizes sensitivity and signal-to-noise ratios obtained with any given tape used TAPE SELECTOR BAS ADJ \ 1 " BAS TYPE OF TAPE M LN UD UO-XL SONY HF FUJ FL FX SCOTCH LD LH 8ASF LH LHS LH SHD SCOTCH BASF All makers TDK MAX FERR CHROME CLASSC FeR c-o SA ELL "vu "''' Memory rewind is included for automatic rewind to predetermined portions of a tape as are independent line-input and microphone-input level controls for professional mixing and control ON _ MEMORY OFFtL r----- MC --- NPUT D SD SONY ~ o UD XL POSTONS NORMAL RESERVE \ 0 0 LEFT~RGHT Types of Tapes and Positions of Tape Selector (Bias and Equalizer) AGFA +5 ~~ 2- osc MAX ELL -2 ~4~/~"5 ou 0 J/ 3 EQUALZER LEFT --@:-RGHT TDK All of the features you would expect from a top-performing cassette deck are present in the KX and more! A peak indicator illuminates when instantaneous levels of recording exceed +6 db even when such signals are far too fast to be registered on the accompanying VU record level meters / MAKER Additional Features And Highlights Of The KX-030 CHROME The expanded scale VU meters (-20 to +5 VU) are easier to read and provide wider dynamic range indications Softtouch lever operated controls make the KX-030 extremely easy to use and the front panel layout is designed with special emphasis on effortless fingertip operation Even Kenwood's unique 2way cassette door system offers advantages to the user Combined with frontloading and upright mechanical design of the transport system the door mechanism includes the tape holder and the door itself can be easily removed from the deck so that mechanical operation of the cassette can be fully observed and when no cassette is inserted magnetic heads capstan and pinch roller are all easily accessible for cleaning and maintenance * Dolby is a trademark of Dolby Laboratories nc lei

5 How Kenwood Engineers Designed The New KX-1030 With Extended Frequency Response Lower Noise And Lower Distortion Using A Three-Head Design % Although some dual purpose record/ playback heads incorporated in conventional cassette decks provide good performance the use of combination heads to record and reproduce tapes impose a limitation in terms of frequency response and dynamic range The most important factor that determines recording and playback response is the gap width of the head For example the gap width of a playback head is a critical factor in determining the high-frequency capability of cassette decks A signal recorded on tape may be thought of as having a wavelength which is inversely proportional to its frequency As the signal frequency increases its wavelength becomes shorter and shorter When the wavelength to be recorded approaches the width of the playback head gap in length the playback head can no longer produce an output and response falls off drastically at that point Ordinary Rec/PB Head (Wide Gap Width) inches) t is this minute and optimum gap width that is largely responsible for the extended frequency range and wider dynamic range of this cassette deck n addition the depth of the head gap is maintained at 100 microns for higher playback sensitivity The Kenwood dual combination record/playback head Frequency Responseof Rec Head Using Various Gap Widths rrn rr-l it 0!!!!llf toad 10 Gap Wdth e Reco~ al =t !!! B" 4-1_ 6 / '11' ~_!l!!~ ShO<! wavelength rnaqnetic field p;j 1-=/' 2 / 10 ; ' i i ' 01 ~~== [}'SlOrtlon(%) Output vs Distortion of Rec Head Using Different Gap Widths Gap width KX-1030 Playback Head (Narrow -Playback L ---H~ "Short < Gap Width) head wavelength Magnetic magnetic field tape Gap width n order to extend the frequency range the gap width of the playback head used in the KX-1030 is held to less than 15 microns (a micron is equal to grams-em" Only when one compares this with the kinetic energy of rotation of conventional decks - which ranges from 600 to 1700 grams-em? - can one fully appreciate the importance of the massive flywheel used in the KX-1030 As a result of this high kinetic energy flutter (perceived audibly as a rapid warbling of recorded sound) and wow (perceived as a slower wavering of musical pitch caused by mechanical variations in the tape drive system) have been reduced to the low level normally found in high quality open-reel machines A Precision Die-Cast Zinc Alloy Flywheel With A Mass Of 150 Grams Provides Greater nertia And More Accurate Tape Motion Another aspect of the extraordinary performance of the new KX-1030 arises from its ability to provide accurate constant rotation of the tape capstan shaft - the most important element in driving the tape Kenwood engineers recognized that the tape-drive motor alone cannot absorb speed variations in the tape drive system Accordingly they incorporated a massive flywheel (with a weight of 150 grams) to increase kinetic energy of rotation to a high 5460 Wow & Flutter Characteristics High Power High Torque DC Servo Motor While the use of a large flywheel in a cassette deck's transport system contributes significantly to stable and accurate rotation of that drive system driving such a heavy flywheel requires a motor with high rotational torque Kenwood engineers have incorporated a motor with a rotational torque of 50 gram centimeters in the KX-1030 compared with approximately 20 gram centimeters of torque provided by the motors used in many other cassette decks Another important feature of this well designed DC servo motor is that a sudden increase in load (often encountered in cassette drive systems when less-than-perfect cassette tape housings are used) has a negligible effect upon the stability of the tape drive system

6 SPECFCATONS Type Track System Recording System Erasing System Tape 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 nput Sensitivity /1mpedance LNE x 2 DN xl Microphones x 2 Output Level/Load mpedance LlNEx2 DN xl Headphones xl Front Loading Stereo CassetteDeck Built-in Features with Dolby' System 4-Track 2-Channel Stereo/Mono Recording/Playback AC Bias System (Bias Frequency: 85 khz) AC System 476 cm/sec (1-7/8 ips) Three Ferrite Heads Recording and Playback Dual Combination Head x 1 Erasing Head x 1 Electronically Controlled DC Motor Approx 80 Secondswith C-60 Tape 25 Hz to Hz (35 Hz to Hz ±3 db) 25 Hz to 20;000 Hz (35 Hz to Hz ±3 db) 25 Hz to Hz (35 Hz to Hz ±3 db) Power Rquirements 65 db (Normal Tape) 67 db (Cr02) 55 db (Normal Tape) 57 db (Cr02) Lessthan 13% (at 1 khz OVU with Normal Tape) 006% (WRMS) 775 mv/56 k ohms 01 mv/10 k ohmseurope & Scandinavia model 109 mv/l5 k ohmsother Countries model 019 mv/l0 k ohms 775 mv (OVU)/20 k ohms 775 mv (OVU)/20 k ohms 489 mv/8 ohms to 16 ohms Walnut veneer finish side panels B-lO (optional) Power Consumption Dimensions Weight Supplied Accessories Reference Tape* Three Ferrite HeadsDolby Noise Reduction System with ndicator Three Position Bias Selector (NormalChrome-Reserve) Three Position Equalization Selector (Norrnal-Chroms-Reserve} Fine Bias Adjustment Controls with Oscillator Full Auto Shut-Off Mechanism in All Modes Mic/Line Mixing Memory Rewind LED Peakand Recording ndicator Tape Monitor Three Digit Tape Counter Two Large Size lluminated VU Meters Two Microphone Jacks Headphone Jack DN Rec/ Play Connector AC 120V 60 Hz - USA & Canada Model AC 220V 50 Hz - Australia Model AC 240V 50 Hz - UK Model AC 120V /220V (Switchable} 50/60 Hz - Other Countries 130 watts W16-15/16" (430mm) H6-9/16" (167mm) 013-1/16" (332mm) 75 kg (165 lbsl Stereo Connection Cord x 2 Head Cleaning Kit x 1 Normal; TDK SD-C90 Chrome; TDK SA-C60 Reserve; SONY DUAD C-60 Kenwood follows a policy of continuous advancements in development For this reason specifications may be changed without notice *NOTE: Dolby is trademark of Dolby Laboratories nc Carrying handles D-O (optional) $KENWOOD KENWOOD ELECTRONCS NC 1315 E Watsoncenter Rd Carson California 90745; 75 Seaview Drive Secaucus New Jersey n Canada: Magnasonic Canada Ltd C-714-K 7n233SA Printed in Japan