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Perfect-Q-1

Ray Miller

Rick Jeffs

Dennis Bohn

RaneNote 154

© 2005 Rane Corporation

Perfect-Q™, the Next Step in
Graphic EQ Design

• What You See Is (Really) What You Get

• Independent Band Adjustment

• Constant Bandwidth For All Sliders

• Minimum Phase Response

• Eliminates Band Interaction Overload

RaneNote

PERFECT-Q™, THE NEXT STEP IN GRAPHIC EQ DESIGN

Pursuit of the Unreachable Star

The quest for absolute truth in graphic equalizer slider

position has a long history and recently took a giant

step forward. Using advanced DSP algorithms, Rane

Corporation introduced an entirely new generation of

graphic equalizers that realize the dream of having the

output magnitude response correspond exactly to the

front panel settings.* Extensive development resulted in

this new technology trademarked “Perfect-Q,” because

that is what it does: calculates the perfect Q required

to create the exact response dictated by the front panel

slider positions.

*Acknowledgement is given to the first products addressing this
issue: the IEQ Smartcurve by ART and the TC 1128 by T.C. Elec-
tronics both introduced in 1987, and to the latest work achiev-
ing similar results by Lake Technology in 2002 as part of their
proprietary loudspeaker processor designed for Clair Brothers,
named Clair iO, and available now to the general public as the
Lake Contour loudspeaker processor. This processor exhibits true
arbitrary magnitude response for all equalizer types. Rane's unique
technology is developed specifically for graphic equalizer use (i.e.,
one providing real mechanical front panel slide controls), to faith-
fully duplicate the front panel fixed-frequency slider positions.

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Содержание DEQ 60L

Страница 1: ...20k 15 120 30 240 60 12 12 12 12 0 0 0 CU T ON L Y 12 4 8 5 7 3 2 10 1 11 9 0 6 CUT 12 4 8 5 7 3 2 10 1 11 9 0 6 CUT 6 2 4 1 5 0 3 CUT 6 2 4 1 5 0 3 CUT 5 0k 25 31 5 40 50 63 80 100 800 125 160 200 250 500 400 315 630 2 0k 1 25k 1 0k 1 6k 3 15k 2 5k 4 0k 12 5k 8 0k 6 3k 10k 16k 20k LOW MID HIGH LOW HIGH IN OUT POWER B EQ EQ PROPO R T Q OUT IN PERFEC T Q BY P AS S A 12 CUT FI L TER S TONE LEVEL DEQ...

Страница 2: ...the power cord is the AC mains disconnect device and must remain readily operable To completely disconnect this apparatus from the AC mains disconnect the power supply cord plug from the AC receptacle 16 This apparatus shall be connected to a mains socket outlet with a protective earthing connection 17 When permanently connected an all pole mains switch with a contact separation of at least 3 mm i...

Страница 3: ...courant alternatif AC et doit absolument rester accessible Pour déconnecter totalement l appareil du secteur débranchez le câble d alimentation de la prise secteur 16 Cet appareil doit être branché à une prise terre avec protection 17 Quand il est branché de manière permanente un disjoncteur tripolaire normalisé doit être incorporé dans l installation électrique de l immeuble 18 En cas de montage ...

Страница 4: ...k 15 120 30 240 60 12 12 12 12 0 0 0 CUT ONLY 12 4 8 5 7 3 2 10 1 11 9 0 6 CUT 12 4 8 5 7 3 2 10 1 11 9 0 6 CUT 6 2 4 1 5 0 3 CUT 6 2 4 1 5 0 3 CUT 5 0k 25 31 5 40 50 63 80 100 800 125 160 200 250 500 400 315 630 2 0k 1 25k 1 0k 1 6k 3 15k 2 5k 4 0k 12 5k 8 0k 6 3k 10k 16k 20k LOW MID HIGH LOW HIGH IN OUT POWER B EQ EQ PROPORT Q OUT IN PERFECT Q BYPASS A 12 CUT FILTERS TONE LEVEL DEQ 60L A B A B B...

Страница 5: ...passed Filters include EQ TONE and CUT Automatic relay bypass hardwires Inputs to Outputs in the event of a power failure 6 A B switches determine which set of controls is used by the A channel or B channel Controls affected by the A B switch are EQ TONE CUT FILTERS LEVEL Q switches and 12 6 dB switches Bypass switches are not affected 7 PERFECT Q What you see is what you get PROPORTional Q Classi...

Страница 6: ...ou must keep them short as possible 10 feet 3 meters maximum Long unbalanced cables invite hum noise and other undesirables Balanced TRS are much better at rejecting noise The Euroblocks normally connect the cable shield to the ground terminal For those installations where the internal shield to chassis connection causes interference connect each shield directly to the chassis grounding screw loca...

Страница 7: ...xt to power amps 14 Works virtually anywhere in the world 15 Maximum level of precision Graphic EQ Controls Control each of the thirty bands of EQ with high resolution 256 step slide controls The center detent position guarantees a flat response Perfect Q filters guarantee accurate graphic response and no band interaction The elimination of band interaction means the DEQ filters are suitable for r...

Страница 8: ... details read the RaneNote Perfect Q the Next Step in Graphic EQ Design available at rane com DATA SHEET The DEQ 60L features 45 mm sliders a switchable Cut Only mode additional Cut filters and additional 3 band Tone con trols The DEQ 60L provides the most complete set of pure EQ functions ever offered in an analog controlled equalizer Features Perfect Q What You See Is What You Get No filter inte...

Страница 9: ...igh Cut Filter 5 20 kHz Meters Input and Output Each channel Type Peak responding dBu Peak dBu is displayed for 1 5 sec Attack Decay 0 500 typ ms per 20 dB step Bypass Power Failure Automatic relay bypass Input wired to Output Bypass Switch Mode Each channel Rear switch Bypass All Filters and levels bypassed By front panel bypass Rear switch Bypass Filters Filters bypassed By front panel bypass A ...

Страница 10: ...izer shall be front panel switchable between two modes Proportional Q or Perfect Q The equalizer shall have a front panel switch selecting cut only or boost cut operation Low and high cut filters shall be provided with 12 dB octave slopes and adjustable corner frequencies Tone controls shall be provided for low mid and high frequencies The tone controls shall have a range of 6 dB to off Input and ...

Страница 11: ...ed response showing effects of band interaction Figure 1 Band interaction of 1 3 octave Proportional Q filters 14 14 12 10 8 6 4 2 0 2 4 6 8 10 12 2 2 1 75 1 5 1 25 1 0 75 0 5 0 25 0 0 25 0 5 0 75 1 1 25 1 5 1 75 d B u octaves individual responses actual slider settings no band interaction or ripple combined response is perfect Figure 2 Graphic response of Perfect Q filters 0 2 4 6 8 10 12 2 3 4 2...

Страница 12: ...Extensive development resulted in this new technology trademarked Perfect Q because that is what it does calculates the perfect Q required to create the exact response dictated by the front panel slider positions Acknowledgement is given to the first products addressing this issue the IEQ Smartcurve by ART and the TC 1128 by T C Elec tronics both introduced in 1987 and to the latest work achiev in...

Страница 13: ...s unlike any other graphic EQ available i e one providing real mechani cal front panel slide controls as of January 2003 DSP Provides the Solution DSP allows more flexible processing than analog and permits delaying final filter parameters until the actual user settings are known something not possible with analog This gives the power to build an EQ that has an ideal response The idea driving deve...

Страница 14: ... 0 0 5 1 1 5 octaves d B u Proportional Q Perfect Q By the 1970s it was clear that a constant Q design would come a lot closer to the ideal The use of active filters greatly increased the designer s ability to realize new filter topologies and in 1981 three constant Q one third octave graphic equalizers were concurrently designed While a significant improvement the results were not ideal Figure 2 ...

Страница 15: ...nuating its frequency band Graphic equalizers suffer from overlapping band problems where adjusting one band adjusts adjacent bands to a lesser but significant extent resulting in a frequency response not matching the settings Creat ing a response matching the settings makes equalizers easier to use Various techniques exist to achieve this aim you can use complex filters which have negligible effe...

Страница 16: ...small settings but not for large ones The results are good as long as the filters are not boosted or cut by large amounts in that case the result is a compromise but it is better than uncorrect ed To linearize the system the filters must be cascaded This results in the dB logarithmic level responses of the filters summing together to form the composite response otherwise phase shifts between filte...

Страница 17: ...Perfect Q 6 Rane Corporation 10802 47th Ave W Mukilteo WA 98275 5098 USA TEL 425 355 6000 FAX 425 347 7757 WEB www rane com 106685 ...

Страница 18: ...erconnections Grounding and EMC practices Shields of connectors in audio equipment containing active circuitry Rane s policy is to accommodate rather than dic tate However this document contains suggestions for external wiring changes that should ideally only be implemented by trained technical personnel Safety regulations require that all original grounding means provided from the factory be left...

Страница 19: ...nal grounding system improperly thus creating balanced equipment that is not immune to the cabling s noise currents This is one reason for the bad reputation sometimes given to bal anced interconnect A second reason for balanced interconnect s bad reputation comes from those who think connecting unbalanced equipment into superior balanced equip ment should improve things Sorry Balanced inter conne...

Страница 20: ...on Figure 1b Recommmended practice CASE COMMON WRONG PRACTICE RECOMMENDED PRACTICE OPTIONAL CASE 1 2 3 3 1 2 CHASSIS GROUND SIGNAL GROUND CHASSIS GROUND CHASSIS GROUND Not using signal ground is the most radical depar ture from common pro audio practice Not that there is any argument about its validity There isn t This is the right way to do it So why doesn t audio equipment come wired this way We...

Страница 21: ...h consistent success indicates this and other acceptable solutions to RF issues exist though the increasing use of digital and wireless technology greatly increases the possibility of future RF problems If you ve truly isolated your hum problem to a spe cific unit chances are even though the documentation indicates proper chassis grounded shields the suspect unit is not internally grounded properl...

Страница 22: ...References 1 Neil A Muncy Noise Susceptibility in Analog and Digi tal Signal Processing Systems presented at the 97th AES Convention of Audio Engineering Society in San Fran cisco CA Nov 1994 2 Grounding Shielding and Interconnections in Analog Digital Signal Processing Systems Understanding the Basics Workshops designed and presented by Neil Muncy and Cal Perkins at the 97th AES Convention of Aud...

Страница 23: ... 20 24 24 19 18 17 B B B B A A A A A A FEMALE BALANCED XLR NOT A TRANSFORMER NOR A CROSS COUPLED OUTPUT STAGE FEMALE BALANCED XLR EITHER A TRANSFORMER OR A CROSS COUPLED OUTPUT STAGE BALANCED TRS NOT A TRANSFORMER NOR A CROSS COUPLED OUTPUT STAGE BALANCED TRS EITHER A TRANSFORMER OR A CROSS COUPLED OUTPUT STAGE FLOATING UNBALANCED TRS TIP RING SLEEVE SLEEVE IN UNIT NC OR 3 5 mm UNBALANCED TS TIP S...

Страница 24: ... RED SHIELD RED SHIELD SHIELD RED RED BLACK N C N C N C RED BLACK RED SHIELD N C BLACK RED BLACK RED 3 NC 2 RED 1 SHIELD 2 RED 1 SHIELD 3 BLACK 2 RED 1 NC 3 BLACK 2 RED 1 NC 3 BLACK 2 RED 1 SHIELD SHIELD FEMALE FEMALE FEMALE RED SHIELD RED BLACK SHIELD SHIELD RED BLACK RED BLACK BLACK RED RED SHIELD RED SHIELD RED SHIELD RED SHIELD RED BLACK 2 CONDUCTOR SHIELDED CABLE 2 CONDUCTOR SHIELDED CABLE 2 ...

Страница 25: ...D 3 BLACK 2 RED 1 SHIELD 3 BLACK 2 RED 1 SHIELD 3 BLACK 2 RED 1 SHIELD SHIELD BLACK SHIELD RED BLACK SHIELD RED BLACK RED SHIELD SHIELD BLACK RED SHIELD BLACK RED SHIELD BLACK RED SHIELD BLACK RED SHIELD BLACK RED SHIELD RED SHIELD RED SHIELD RED SHIELD RED BLACK RED N C N C BLACK RED BLACK RED BLACK RED RED SHIELD RED SHIELD RED SHIELD RED 24 S BLACK T RED CROSS COUPLED OUTPUT ONLY CONNECT BLACK ...

Страница 26: ...00 125 160 200 250 500 400 315 630 2 0k 1 25k 1 0k 1 6k 3 15k 2 5k 4 0k 12 5k 8 0k 6 3k 10k 16k 20k LOW MID HIGH LOW HIGH IN OUT POWER B EQ EQ PROPORT Q OUT IN PERFECT Q BYPASS A 12 CUT FILTERS TONE LEVEL DEQ 60L A B A B B PROPORT Q OUT IN PERFECT Q BYPASS A 12 12 4 4 2 2 6 8 8 10 10 6 12 0 12 4 4 2 2 6 8 8 10 10 6 12 0 6 6 6 2 2 1 1 3 4 4 5 5 3 6 0 6 2 2 1 1 3 4 4 5 5 3 6 0 5 0k 25 31 5 40 50 63 ...

Страница 27: ...00 125 160 200 250 500 400 315 630 2 0k 1 25k 1 0k 1 6k 3 15k 2 5k 4 0k 12 5k 8 0k 6 3k 10k 16k 20k LOW MID HIGH LOW HIGH IN OUT POWER B EQ EQ PROPORT Q OUT IN PERFECT Q BYPASS A 12 CUT FILTERS TONE LEVEL DEQ 60L A B A B B PROPORT Q OUT IN PERFECT Q BYPASS A 12 12 4 4 2 2 6 8 8 10 10 6 12 0 12 4 4 2 2 6 8 8 10 10 6 12 0 6 6 6 2 2 1 1 3 4 4 5 5 3 6 0 6 2 2 1 1 3 4 4 5 5 3 6 0 5 0k 25 31 5 40 50 63 ...

Страница 28: ...00 125 160 200 250 500 400 315 630 2 0k 1 25k 1 0k 1 6k 3 15k 2 5k 4 0k 12 5k 8 0k 6 3k 10k 16k 20k LOW MID HIGH LOW HIGH IN OUT POWER B EQ EQ PROPORT Q OUT IN PERFECT Q BYPASS A 12 CUT FILTERS TONE LEVEL DEQ 60L A B A B B PROPORT Q OUT IN PERFECT Q BYPASS A 12 12 4 4 2 2 6 8 8 10 10 6 12 0 12 4 4 2 2 6 8 8 10 10 6 12 0 6 6 6 2 2 1 1 3 4 4 5 5 3 6 0 6 2 2 1 1 3 4 4 5 5 3 6 0 5 0k 25 31 5 40 50 63 ...

Страница 29: ... WARRANTY SHALL BE THAT WHICH IS DESCRIBED TO THE ORIGINAL RETAIL PURCHASER BY THE AUTHORIZED RANE DEALER OR DISTRIBUTOR AT THE TIME OF PURCHASE Rane Corporation does not however warrant its products against any and all defects 1 arising out of materials or workmanship not provided or furnished by Rane or 2 resulting from abnormal use of the product or use in violation of instructions or 3 in prod...

Страница 30: ...E FACTORY IN THE U S If the product is being sent to Rane for repair please call the factory for a Return Authorization number We recommend advance notice be given to the repair facility to avoid possible needless shipment in case the problem can be solved over the phone UNAUTHORIZED SERVICE PERFORMED ON ANY RANE PRODUCT WILL VOID ITS EXISTING FACTORY WARRANTY FACTORY SERVICE If you wish your Rane...

Страница 31: ...ration Type of Equipment Professional Audio Signal Processing Brand Rane Model DEQ 60L Immunity Results A weighted quasi peak noise AC 24 tested Test Description Results Conditions RF Electromagnetic Fields Immunity 80 MHz 1000 MHz 1 kHz AM 80 depth 3V m 70 dBu 80 Mhz 1000 MHz Conducted RF Disturbances Immunity 150 kHz 80 MHz 1 kHz AM 80 depth 3V RMS 67 dBu Power Lines 150 kHz 80 MHz 62 dBu Signal...

Страница 32: ...NPUT B INPUT A COMMERCIAL AUDIO EQUIPMENT 24TJ R FOR CONTINUED GROUNDING PROTECTION DO NOT REMOVE SCREW This device complies with Part 15 of the FCC Rules Operation is subject to the following two conditions 1 this device may not cause harmful interference and 2 this device must accept any interference received including interference that may cause undesired operation CAN ICES 3 B NMB 3 B U S PATE...

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