Speck EQF 810 Manual de usuario

speck electronics

EQF 810

Audio Equalizer

Reference Manual

Speck Electronics products are warranted to the original owner to be free of

defects in material or workmanship.

This warranty does not apply to any product subject to accident, misuse,

neglect, or failure to comply with normal maintenance procedures, or if the

serial number has been defaced, altered, or removed; nor will Speck

Electronics accept responsibility for damages resulting from improper

installation, alteration or unauthorized parts or repairs. If the product is

modified by the customer without permission, the customer agrees to pay for

parts and labor necessary to remove the modification before repair. The cause

of the defect is in the sole judgment of Speck Electronics.

Should a defect develop within one year of purchase from Speck Electronics

or an authorized dealer, Speck Electronics will supply the part or parts

necessary at no charge. Labor is covered in this warranty for a period of one

year. Outside service, repairs, or pickups are not covered under this warranty.

Any item returned for warranty repair should be sent, if possible, in the

original packing container, prepaid to Speck Electronics, 341 E. Alvarado

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 send an "update notice" to all customers at no charge.

Speck Electronics makes no warranty of any kind with regard to this material,

including, but not limited to, the implied warranties of merchantability and

fitness for a particular purpose. Speck Electronics shall not be liable for

errors contained herein or for incidental consequential damages in connection

with the furnishing, performance, or use of this material.

This document contains proprietary information which is protected by

photocopied, reproduced, or translated into another language without the prior

written consent of Speck Electronics.

The information contained in this document is subject to change without

notice.

All trademarks are the property of their respective owners.

Speck Electronic

341 East Alvarado Street

Fallbrook, California 92028

USA

1+760-723-4281

www.speck.com

Warranty

Notice

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

Standard accessories ....................................................

Operator safety summary ...................................................

Power source .............................................................

Removing the cover ....................................................

Speciﬁcations ..................................................................

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

Unpacking and inspection ............................................

Environmental considerations .......................................

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

Mechanical installation ................................................

Physical placement of adjacent equipment ......................

Cleaning .........................................................................

Repacking for shipment .....................................................

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

Basic Theory of Equalizers ...............................................

Low-pass ﬁlter.............................................................

High-pass ﬁlter ............................................................

Bandpass ﬁlter.............................................................

Default control setting........................................................

Front Panel Controls .......................................................

Output select ...............................................................

Variable ﬁlters.............................................................

L - Low band controls ..................................................

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

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

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

Contents

iii

Chapter 1 Introduction

Chapter 2 Installation

Chapter 3 Operation

Chapter 4 Wiring

and Other

Introduction

General

Thank you for purchasing our EQF 810 Equalizer. The EQF 810 has

operational features that are easy to understand and you should be up

and running in no time. If you have any questions regarding the

EQF 810 or any Speck product, do not hesitate to contact Speck

Electronics.

Speck Electronics

341 E. Alvarado Street

Fallbrook, CA 92028

Phone +760-723-4281

email [email protected]

The EQF 810 is a four band parametric equalizer and two variable

filters housed in a 1/2 rack space chassis that covers the audio spectrum

from a low 20Hz all the way up to 25kHz. It is well suited in audio

applications for 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 topologies and

the variable filters use a 2nd order Butterworth design. The line inputs

are active-balanced and the outputs are switchable between active-

balanced or Jensen Transformer-balanced.

The EQF 810 is available in 2 versions;

• The Model EQF 810-NA designed to operate with 100 and 120

VAC mains power.

• The Model EQF 810-EU that is designed to operate with 220, 230

or 240 VAC mains power.

Chapter 1 Introduction Section 1

The EQF 810 is supplied with the following list of accessories:

• Operations Manual

• Power cord (North American version only)

• (4) rubber bumpers - used for table top mounting or stacking

multiple units.

• (3) 6-32 x ½” machine screws - supplied to mount the EQF 810

to an optional rack shelf.

The EQF 810 is intended to operate from an AC power source that

does not apply more than 120 Volts RMS (Model EQF 810-NA) or

240 Volts RMS (Model EQF 810-EU) between the supply conductors.

Always make certain 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 supply, contains voltages that

can cause serious injury or death. Refer all repairs to a qualified

service technician, or directly to Speck Electronics.

Operator Safety

Summary

Do not remove

covers or panels

Standard accessories

Power source

Chapter 1 Introduction Section 2

Frequency Response

Input Level

Normal

+4 dBu

Maximum

+28dbu

Output Distortion(THD+n)

22Hz to 22KHz @ +4dBu

.0016%

Test Conditions:

AP balanced +4dBu signal connected to input.

All Boost/Cut controls set to “0”

LP and HP ﬁlters enable switches set “out”

4 Band EQ enable switch set “in”

AP analyzer connected at output

Residual Noise Measurement

Test Conditions:

AP balanced signal connected to input.

AP Generator set “Off”

All Boost/Cut controls set to “0”

AP analyzer connected at output

Power requirements 9 Watts

Dimensions HxWxD = 8.6" x 1.75" x 11"

(218mm x 44mm 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

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) to 149kHz(-3dB)

10Hz(-0.25dB) to 68kHz(-0.5dB)

10Hz(-.25dB) to 148kHz(-3dB)

Residual Noise Measurement

(10Hz-80kHz)

-89 dBu

Speciﬁcations

(Active Balanced)

(Transformer Balanced) .0025%

Shelf switches set “out”

LP ﬁlter, HP ﬁlters, and Equalizer enable switches set “in”

Shelf switches set “out”

Transformer - Active output switch set “out”

Chapter 1 Introduction Section 3

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Chapter 1 Introduction Section 4

Installation

The following information should give you the basics on how to install

the EQF 810. The proper installation of the EQF 810 as part of a larger

system requires a clear understanding of audio wiring, AC distribution,

grounding, and shielding techniques.

When the EQF 810 is being installed into a larger system, it may be

necessary to retain the services of someone experienced in these

matters.

The EQF 810 is delivered in a special, protective shipping container

and was carefully inspected both mechanically and electrically before

shipment. It should be physically free of mars and scratches and in

perfect electrical order upon receipt. To 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 around the unit and to prevent overheating,

do not obstruct the air vents on the side and top.

While the internal circuitry of the EQF 810 is fully shielded by the steel

chassis, installation should nevertheless be planned to avoid locating it

immediately adjacent to power amplifiers, power supplies, or any

source of low frequency electromagnetic emissions.

General

Unpacking and inspection

Environmental considerations

Chapter 2 Installation Section 5

The ground pin of the power cord and power inlet are internally

connected to the chassis. To avoid electrical shock, plug the EQF 810

into a properly wired AC receptacle. For safety reasons, do not lift the

ground on the power plug by using a ground lift adapter.

Upon loss of a protective ground connection, all accessible conductive

parts, including knobs and controls that may appear to be insulating,

can render an electric shock.

The location of the EQF 810 should be such that the operator has a

clear, unobstructed view of the front panel from his/her normal

operating position. The unit should also be within easy reach of the

operators normal position in order to facilitate the use of the front panel

controls

The ½ rack form factor of the EQF 810 allows a single unit to be

mounted on a table top with the (4) rubber bumpers (supplied), multiple

units stacked, or two units mounted side-by-side on a 1U rack shelf.

1 rack space (1U) rack shelves are manufactured 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 ½” machine screws (supplied). Do not use screws that are

longer than ½” 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 E.I.A. universal spacing.

Any device that emits a high EMI (Electro Magnetic Interference) or

RFI (Radio Frequency Interference) energy field should be treated with

suspicion. EMI is considered any unwanted signal which adversely

affects the operation of the EQF 810 or the audio system. This subject

is discussed in Chapter 4.

Electronic equipment such as power amplifiers, power supplies, video

monitors, computers, certain synths, and samplers should be located

away from the EQF 810 and its associated audio cables. It may be

necessary to alter the positions of certain equipment that you feel would

cause buzzes or hums in the audio system.

Mechanical installation

Physical placement of

adjacent equipment

Grounding the product

Chapter 2 Installation Section 6

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