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Содержание 4BX

Страница 1: ...Model 4BX Three Band Dynamic Range Expander with Impact Restoration and Remote Logicontrol Owner s Manual ...

Страница 2: ...e unit into a standard 19 inch 483 mm wide equipment rack see below No special ventilation is required in any installation other components may be stacked above or below the 4BX provided that they themselves do not get hot A CAUTION risk of iirctmc shock 00 NOt OPtN CAUTION TO REDUCE THE RISK OF ELEC TRIC SHOCK DO NOT REMOVE COVER OR BACK NO USER SERVICEABLE PARTS INSIDE REFER SERVICING TO QUALIFI...

Страница 3: ...emote control Connections Rear jacks and controls About impact restoration expansion and dynamic range Typical hookups Usage notes and cautions Specifications and notes Warranty and factory service information Important information for users in the UK ...

Страница 4: ...ate power on B OFF Push this button to turn the 4BX off The LED above it which lights up whenever the power is on will go out Note When you turn the 4BX off it is only re moved from the signal path it does not shut down the sound If you ve been listening at a 20 to 30 dB level again see the Volume section and press OFF the sound suddenly will increase by a lot This is most likely to happen when us...

Страница 5: ...separately adjusted to suit various kinds of music and different speakers and to vary the overall expansion mix see Connections Rear Jacks and Contmls The point between upward and downward the center or unity gain point is set by the TRANSITION LEVEL buttons according to their arrows ami is shown in the LED column above them When the incoming program signal is above louder than this set level the4...

Страница 6: ...4BX s actions take place with respect to taping The more common application will be expanding a tape on playback with both TAPE and POST pushed in This places the 4BX after the deck s out put of course the deck is in play not record If you have not a tape deck but a signal processor in the 4BX s tape loop pressing POST and TAPE places the 4BX expansion etc after the signal processor which most oft...

Страница 7: ...nitor a tape being made of a PRE expanded program using the deck s own Tape Source switch I BYPASS Pressing this button removes the 4BX s expansion and impact restoration from the signal path but that s all Everything else still works Which means among other things that you can still control your stereo system s loudness remotely even with no expansion or impact restoration at work J DISPLAY This ...

Страница 8: ...unit has a switch for differ ent power sources be sure it s set correctly A word about switched and unswilched ac outlets on other components to plug the 4BX into If the 4BX is in an unswilched outlet its memory still operates when it s off and when you turn the unit on all functions are in their last mode as noted earlier However on first power which Is every time if the 4BX is in a switched outl...

Страница 9: ...per range brightness of the sound above approxi mately 6 kHz A lower transition level turn the control clockwise produces more upward expan sion of the very high frequencies relative to the rest of the sound a higher transition level turn the control counterclockwise does the opposite taming the sound a bit if it s hissy for example and provid ing more noise reduction The control is set at the fac...

Страница 10: ...kinds of music we think you will agree As for dynamic range itself it may be simply defined as the difference in level between the loudest and the softest sounds in any given musical performance or recording In a performance the loudest sounds are limited only by the musician s ability to strike bow or blow into the instrument by its own limitations e g a pipe organ or with amplified music by the ...

Страница 11: ... and audio cassettes have dynamic ranges much much less than 90 dB Conventional records do well to reach be yond 50 55 dD of dynamic range the most carefully prepared audiophile pressings may have slightly over 65 dB provided they re no decoded discs which upon decoding offer more than 90 dB of dynamic range And even tbe best metal tape cassettes cannot reach 60 dB on their own without noise re _ ...

Страница 12: ...ts audible clues that tell the listener that processing is taking place By flexibly expanding the dynamic range of a compressed program not to mention re creating and or augmenting the impact of its transients the con trasts between loud and soft are restored and those of the original performance more closely approximated AH of which brings back much of the excitement and involvement of listening ...

Страница 13: ...ll the way down before switching on the 4BX for the first time S Mt7fi rotjuf o MctivtR HEWTOH U 1 HI llvtl O O J fir FREAMP LEFT mOHT o o 9 o f o o o 5 o TAPE A ut Tape Deck 1 Basic Signal Connections The 4DX goes between the preamp and the tape deck in the former s tape monitor loop as shown The tape deck then goes in the 4BX tape bop ...

Страница 14: ...tXW OUTPUT PCCOflP fl KFVT Using the 4BX with a dbx Noise Reduction System The 4BX comes first in the hookup and last in the signal path except for an automatic EQ Connect it direclty in one of the tape monitor loops of the preamp as shown Then connect the no se reduction unit directly in the 4BX s tape loop Finally the deck itself goes directly in the noise reduction unit s tape monitor loop Red ...

Страница 15: ...d a 1 4 1 setting might be the place to begin CAUTIONS Any expander can make greater demands of your power amplifier and loud speakers after all that s its job On the other hand because noise rumble hiss and such are reduced expanded downward by an expander the ampli fier is being used more efficiently Whether a given amp is powerful enough isn t always easy to determine after an expander is added...

Страница 16: ...any unwanted transients Pops and clicks from noisy controls and knobs or indeed from a scratchy record and the tick of the stylus setting down will all be boosted just like musical attacks In other words don t drop he toncarm To be safe back ofT on impact restoration and or turn he volume down whenever you change functions or begin to play a record ...

Страница 17: ...6 wx 12 l 4 d 8 89x45 56 x31 12 cm Weight shipping 14 bs 6 4 kg NOTES 1 Specifications are subject to change without notice 2 All voltages arc rms root mcan squarc 3 Dynamic range is defined as the difference between the maximum rms signal and A weigh cd noise All noise figures arc A Wcightcd 4 Frequency response figures for noise reduction units decoders and expand ers are Tor pink noise or typic...

Страница 18: ...note with a description of the problem and the date of purchase and send the unit freight prepaid to the above address marking it Attcn Repairs FOR USERS IN THE UNITED KINGDOM Important The wires in the unit s mains lead arc coloured in accordance with the following code Blue Neutral Bfown Live As the colours of the wires in the mains lead of this apparatus may not correspond with the coloured mar...

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