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Speck EQF 810, Reference Manual

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Speck EQF 810 Reference Manual Download Page 4

 
 

 

 
 
 

 

General 

.....................................................................

 

Standard accessories 

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Operator safety summary 

...................................................

 

Power source 

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Removing the cover 

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Specifications 

..................................................................

 

General 

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Unpacking and inspection 

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Environmental considerations 

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Grounding the product ..........................................................

 

Mechanical installation 

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Physical placement of adjacent equipment 

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Cleaning 

.........................................................................

Repacking for shipment 

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General 

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Basic Theory of Equalizers

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      Low-pass filter

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      High-pass filter

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      Bandpass filter

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Default control setting

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Front Panel Controls

 

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      Output select

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Variable filters

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L - Low band controls

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L/M - Low/Mid band controls

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M - Mid band controls

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H - High band controls

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Rear Panel

 

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Input connectors

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Output Cconnectors

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A.C. power inlet

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Fuse

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Power switch

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Main voltage selector switch

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General  .................................................................................

 

Audio cable  ..........................................................................

 

Connectors  ...........................................................................

AC Distribution and safety

  ......................................................

 

Proper AC grounding  ...........................................................

 

Quality AC system  ...............................................................

 

AC distribution .....................................................................

 

Clock noise and AC  .............................................................

 

Safety earth connection ........................................................

 

Audio earth ...........................................................................

Proper Audio Grounding and Shielding

 .................................

EMI and RFI

 .............................................................................

 

Sources of EMI  ....................................................................

 

Reducing EMI  ...................................................................... 

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Contents

iii

Chapter 1   Introduction

Chapter 2   Installation

Chapter 3   Operation

Chapter 4   Wiring 
 

 

 and Other

Summary of Contents for EQF 810

Page 1: ...speck electronics EQF 810 Audio Equalizer Reference Manual ...

Page 2: ......

Page 3: ...o Street Fallbrook California 92028 If in our opinion the packing container is improper for return shipping we reserve the right to supply a new container at a minimal charge In the interest of improving Speck products designs and specifications are subject to change without notice It should be mentioned that if a change is necessary for any reason we make every effort to document that change and ...

Page 4: ...ls L M Low Mid band controls M Mid band controls H High band controls Rear Panel Input connectors Output Cconnectors A C power inlet Fuse Power switch Main voltage selector switch General Audio cable Connectors AC Distribution and safety Proper AC grounding Quality AC system AC distribution Clock noise and AC Safety earth connection Audio earth Proper Audio Grounding and Shielding EMI and RFI Sour...

Page 5: ... professional recording sound contracting touring or any application where equalization is required Connect the EQF 810 to virtually any line level source balanced unbalanced or mixer inserts The EQF 810 has high headroom that will handle balanced signals up to 28dBu The EQF 810 design uses I C operational amplifiers for the active electronics All equalizer bands use state variable filter topologi...

Page 6: ...ertain that the power cord matches the operating voltage shown on the rear panel To avoid personal injury do not remove the top cover of the EQF 810 and never operate without the cover panel properly installed If it becomes necessary to remove the cover panel for service or to change the mains operating voltage always disconnect the power cable before proceeding The EQF 810 with its internal power...

Page 7: ...x 280mm Shipping weight Approximately 7 lbs 3 2Kg ALL MEASUREMENTS WERE PERFORMED WITH AN AUDIO PRECISION TEST SET Output Level Active Balanced Transformer Balanced Normal 4 dBu 4 dBu Maximum 28dbu 24dBu Input Impedance 30K Ohms Output Impedance Active Balanced Transformer Balanced 60 Ohms 600 Ohms Measured at active balanced output Measured at transformer output 5Hz 0 25dB to 68kHz 0 5dB 2Hz 25dB...

Page 8: ... This page left intentionally blank Chapter 1 Introduction Section 4 ...

Page 9: ... confirm this the product should be inspected for physical damage that may have occurred in transit Any damage should be reported to your dealer or delivery company as soon as possible If installed in an equipment rack that also contains heat producing equipment adequate ventilation should be provided This will prolong component life and maximize operational stability To insure adequate airflow ar...

Page 10: ...ed by Middle Atlantic Products Model UTR1 Raxxess Model UNS1 When attaching the EQF 810 to the rack shelf it should be secured with 3 6 32 x machine screws supplied Do not use screws that are longer than in length as they could damage the internal circuit board When a single or multiple EQF 810 s are mounted to the rack shelf they may be installed into any 19 wide equipment rack that uses standard...

Page 11: ...stions contact Speck Electronics at 760 723 4281 If the product is to be shipped to Speck Electronics for service or repair contact Speck Electronics for a Return Merchandise Form When we receive the completed form a RMA number and shipping instructions will be issued Place the product in the original container if available If the original container is not used wrap the product in heavy plastic be...

Page 12: ... This page left intentionally blank Chapter 2 Installation Section 8 ...

Page 13: ...t low frequencies pass through can be either fixed at a specific point or variable A high pass filter is a circuit that passes all high frequency signals and rejects low frequency signals The crossover point that high frequencies pass through can be either fixed at a specific point or variable A bandpass filter is a circuit that will pass only a fixed frequency band and reject signals above and below the...

Page 14: ...ency Sweep and Bandwidth controls should be set to their full counter clockwise setting All Boost Cut controls should be set to their 0 center detented position All pushbutton switches should be set to the Out position When any future reference is made to the controls or switches of the EQF 810 will be assumed that they have been set to their neutral positions Default Control Settings Chapter 3 Op...

Page 15: ...y When this switch is depressed the HP filter is enabled A green LED indicates the operation of the filter This switch selects the frequency range of the high pass filter In the out position the low range of 20Hz 250Hz is selected When depressed this switch selects a range of 100Hz 1 2kHz A yellow LED illuminates indicating that the 5X frequency multiplier has been enabled This control adjusts the ...

Page 16: ...control provides a reciprocal volume adjustment of the selected frequency control This means that whatever frequency is boosted with the boost cut adjusted from its center position clockwise an identical but opposite result is achieved when that same frequency selection is cut from its center position counterclockwise Once the desired frequency has been selected with the low frequency sweep contro...

Page 17: ...the bandwidth is a wide 2 25 octaves Q 45 When set fully CW the bandwidth narrows to 22 octave Q 4 4 The center position is approximately 4 octaves Q 2 4 In addition to the ability to contour low band audio the low frequency controls may be used to reduce or eliminate low frequency hum or buzz Low hum is typically 60Hz whereas buzz is typically 120Hz and 240Hz If there is a hum or buzz on an audio...

Page 18: ...ol is provided This control sets the width of the frequency that has been selected on the Mid sweep control When set fully CCW the bandwidth is a wide 2 25 octaves Q 45 When set fully CW the bandwidth narrows to 22 octave Q 4 4 The center position is approximately 4 octaves Q 2 4 The high frequency sweep control is used in conjunction with the high boost cut control and provides continuous adjustm...

Page 19: ...quency hiss or digital noise on a kick drum or bass track the high sweep control may be set to its higher clockwise setting 16kHz 25kHz and its associated boost cut control cut a few dB s As long as you don t dramatically change the sound of the low frequency audio this could remove a little noise Every little bit improves the overall quality of your sound This switch changes the high frequency ba...

Page 20: ...output of the EQF 810 has a balanced 1 4 jack and male XLR connector These outputs are internally wired in parallel and there is no operational difference between one or the other The outputs can be either Transformer Balanced or Active Balanced depending on the position of the Output Select Switch on the front panel The 1 4 TRS and XLR may be used at the same time 21 Input Connectors 22 Output Co...

Page 21: ...ternally connected to the chassis For safety reasons do not lift the ground Earth on the power plug by using a ground lift adapter The AC power inlet has integral fuse holder that uses a 5mm x 20mm slow blow T type fuse To avoid the risk of fire always replace the fuse with the correct value fuse as marked on the rear panel 750 amp for the 120V model or 375 amp for the 230V model This ON OFF power...

Page 22: ...l see a slide switch mounted on the green circuit board as shown in Figure 4 Beside the switch 26 are markings in white letters 115 230 If your mains voltage is 100VAC or 120VAC set the voltage selector switch to the 115 position If your mains voltage is 220VAC 230VAC or 240VAC set the voltage selector switch to the 230 position Replace the cover and change the fuse according to the chart shown in...

Page 23: ...ttent signal or nonexistent signal stop at that point and solve the problem before proceeding Due to the high performance of the EQF 810 it is recommended that you use only the highest quality audio cable A high quality cable by definition is a cable that provides good mechanical strength high microphonic noise immunity high frequency response low crosstalk and 100 shielding ability All audio cable...

Page 24: ...ifferent locations When installing a large audio system it may be necessary to consult a qualified electrician that is familiar with the specialized style of electrical wiring required for recording studios Clock noise is one of the greatest enemies of the audio racks AC system If a computer or any microprocessor based device most samplers and effects are emits or somehow couples its clock signal w...

Page 25: ...s The audio signals must be carried only by the 2 inner conductors and the shield must act only to cover these 2 conductors without transmitting the signal from one location to another It is recommended that the shield be attached to the common ground at one connector s end and the shield not be connected at the other connector s end It is recommended that all shields be connected at the mixer end...

Page 26: ...t These include the source of the EMI conducted or radiated the propagation medium by which EMI is transmitted directly on the cables or through the air and the receptor that suffers the adverse affects of EMI If any of these 3 elements are eliminated or reduced the EMI interference will be eliminated or reduced The more electronic equipment operating within a studio or equipment rack the higher t...

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