WPG-202

WPG SERIESPROFESSIONAL

ELECTRONICCROSSOVER

OPERATING MANUAL

The WHARFEDALE Wireless Works

was established in 1932 by Gilbert

Briggs who soon established a

reputation as one of the most

innovative loudspeaker

engineers of his generation. His

company was at the leading edge

of an exciting new technology which was dedicated to

bringing the pleasure of music and entertainment into ,

people s homes. As the technology advanced Wharfedale

gave many music lovers their first taste of High Fidelity,

mounting a series of live sound demonstrations which

excited the audio world and heralded the birth of the ‘

modern hi-fi loudspeaker.

Today Wharfedale Pro takes the same uncompromising

approach to the design and manufacturing of every audio

product, using high-quality components and state-of-the-

art testing equipment to ensure consistency and high

performance. At Wharfedale we design and build all of our

products and we control all the variables, so that we ,

don t have to compromise our design goals.

Wharfedale Pro WPG series of Electronic Crossovers are

high quality units suitable for stage, club and studio use.

Using proven circuitry they are straightforward to use,

reliable in operation and capable of excellent

performance.

WPG202 Two channel Electronic Crossover

Balanced inputs and High Band Low Band outputs with

XLR and jack connectors.

Peak level LED indicators

High Pass 40Hz and low pass 15kHz filter circuits

Variable controls for gain and frequency adjustment

.

.

.

.

Wharfedale exclude normal exterior wear to finish and cannot be

held responsible for any system malfunction due to abuse or using

the units beyond the limits and conditions as stated within the

specified ratings. Wharfedale shall not be liable for any

consequential damages. Any implied Warranties expire after the

given term.

This warranty is only valid providing:

i) Warranty applies to original purchaser only (warranty not

transferable)

ii) Warranty card must be filled in fully and returned to Wharfedale

Pro within 30 days from date of purchase.

Failure to do so will in no way affect your statutory rights.

iv) Unit must be returned with original sales receipt or other proof

of purchade.

v) Unit is repaired by Wharfedale or authorised service agent only.

Unpacking

All Wharfedale Pro products are fully

checked before leaving the factory. After

unpacking please inspect contents for any

physical damage. Please retain the

shipping carton if possible and internal packing material in case the

unit needs to be returned. Please check as soon as possible the

unit is functioning correctly. In the event of any damage please

contact your dealer immediately so that a written claim for

damages can be made.

Wharfedale Pro Limited Warranty

Wharfedale Pro WPG Series graphic equalisers are warranted to

be clear of defects in construction, materials and malfunction under

normal operating conditions for a period of 3 years from the

original date o purchase providing the unit has only been used for

its intended purpose.

Wharfedale will during the warranty, and at its own discretion,

undertake to make repairs at no charge if the product has been

delivered to Wharfedale Pro by a Wharfedale Dealer.

These terms do not infringe your statutory rights.

W P G S E R I E S P R O F E S S I O N A L E

To reduce the risk of electric shock the user should notremove the cover. All operating and safety instructionsshould be followed. The unit should be kept clear of water, fluids and moisture and not be operated in dampconditions. The unit should be operated in a wellventilated environment. The unit should be kept awayfrom excessive heat sources such as radiators and ifracked with other power amplifiers there should be a free air flow to vent out the heat produced (check withdealer). The unit must only be connected to a powersupply as shown on the rear of the unit with the IECcable (or similar) provided. The power cord must besituated or routed so as not to be walked upon orpinched or objects placed upon it with special attentionto the area where the power cable enters the IECsocket at the unit. The power cable should be disconnected during prolonged non usage. The usershould not attempt to service the unit or use the unit inany way except as described in this manual. For service and repair your dealer should be contacted.This unit complies with relevant safety regulations.

POWER NOTICE FOR SAFETYAll British and European countries use a nominally230v mains power supply. In practise this variesbetween 220v and 240v. In the USA the nominalsupply is 115v and 100v in Japan. This unit is set tothe correct voltage in the factory and this can bechecked from the label on the rear panel. If you intend to use this crossover in a country which has a different mains supply voltage, you shouldconsult your dealer for advice. As there are no userserviceable components inside the crossover, and high voltages are present, DO NOT remove thecovers! Be sure to make all audio connections tothe crossover before connecting to the mainssupply.

Safety Instructions

P L E A S E R E A D T H E S E I M P O R TA N T

I N S T R U C T I O N S .See picture above for key descriptions

1. Power switch should be pressed in to turn on the

power.

2. The Power LED indicates that the unit is ON.

3. Input Level rotary control +10dB gain is available.

4. Peak LED indicates when the input signal is

overloading the equaliser.

5. Low Cut switch enables frequencies below 40Hz to

be attenuated.

6. High Cut switch enables frequencies above 15kHz

to be attenuated.

7. Low level rotary pot controls the level (dB) of the low

frequency as chosen by control 8.

8. Frequency rotary pot selects the crossover point

that occurs between the low and high in stereo mode

and the low and mid in mono mode.

9. x1/x10 switch selects the range of the frequency

rotary pot (no. 8 in the above diagram)

10. The High/Mid out rotary pot controls the level (dB)

of the low/mid frequency as chosen by control 8. This

level control is Mid in mono mode and High in stereo

mode.

11. CD Horn EQ switch enables a fixed equalisation

curve boost at 10kHz implemented on your

compression driver (CD) horn when the switch is

pressed in.

, ,12. Stereo/Mono switch (mono when in )

13. Stereo/Mono switch LED indicator

14. The High out rotary pot controls the level (dB) of

the high frequency in mono mode and in stereo mode.

15. Only in mono mode This controls the crossover

point between the mid and high units.

16. As no.9 above when in mono mode for high

channel. In stereo mode as no.9 for channel two.

These control no.in the key relate to Mono

operation - in Stereo mode they have same

key descriptions as channel one.

L E C T R O N I C C R O S S O V E R M A N U A L

3 4 5 6 7 8 9 10 11 12 13 15 16 14 1 2

Description The WPG - 202 Series of Electronic crossovers fit

,,standard 1U, 19 (482mm) racks. The WPG crossovers

are housed in steel cases suitable for racking in

professional flight cases.

OperatingI) When switching on the Electronic crossovers ensure

that all audio inputs are connected and that the mains

connections are safely and securely connected at the

supply and unit. All internal servicing must be referred

to qualified service personnel with access to technical

documentation but if the unit fails to work the user can

apply a few basic checks to locate possible problems.

I) If the Power LED is not on:

There is no mains power to the unit.

Check mains connections thoroughly. Check fuses.

Ii) If a system has been set up, and the crossover is

thought not to be functioning, please check the system

connections. If however, the system has already been

working perfectly and the crossover is suspect, follow

the basic fault finding procedure given above. If this

does not produce any results, contact your dealer, who

will be able to solve the problem quickly. Most

malfunctions can be traced to cable (input, output and

mains) failure or to the connections.

ConnectionsEach input channel is electronically balanced with

female XLR connectors.

In accordance with IEC and AES/ANSI standards the

wiring mode is Pin 1 Earth (signal ground), Pin 2 ,,

(positive) and Pin 3 Cold (negative, return). The1/4

Jack socket is also wired in parallel with the XLR. The

Tip is Hot, the ring is Cold and the Sleeve is Ground.

Balanced Operation: Use only when driving from a

true balanced source and driving to a true balanced

destination. Either transformer balanced or with active

drive. Connect the input between pins 2 and 3 with pin

2 positive. Do not connect pin 1. Attached the shield to

connector case (chassis ground). Connect the output

between pins 2 and 3 with pin 2 positive. Do not

connect pin 1. Do not connect the shield at this end to

anything.

Unbalanced Operation: Connect the input between

pins 2 and 1 with pin 2 positive and pin 1 earth (signal

ground). Short pin 3 to pin 1. Attach the shield to

connector case (chassis ground). Connect the output

between pins 2 and 1 with pin 2 positive. Leave pin 3

open - Do not short it to pin 1. Do not connect the

shield at this end to anything.

OperationThe WPG-202 Series of Electronic crossovers can be

used as a 2 way stereo crossover or a mono 3 way

crossover.

The unit comes in the signal chain before the power

amplifier and after the source (mixer, disco equipment

etc.) and other units such as graphic equalisers or

other equaliser units.

Using the WPG-202 Series of Electronic as a 2 waystereo crossoverIn the stereo mode the switch (12) in the picture would

, ,be in the out position. The stereo signals should be

inserted at the rear of the unit into channel one and

channel two. The outputs (high and low) would go to

the power amplifier. There are clear legends on the rear

panel showing these input and outputs for the two

operating modes (mono and stereo). To operate set the

input level on channel 1 (left) so that the signal peak

indicator is not flashing constantly (the LED may flash

occasionally but this does not necessarily mean an

overload is occurring). Set the crossover frequency

low/(mid)high control (8) and adjust the low level output

(7) and high level output (10) to the desired levels (see

, ,below Selecting the right crossover frequencies ).

Follow the same procedure for channel two

remembering that the controls of channel one are the

same as channel two when in Stereo mode. For this

, , mode the x1/x10 switch (9) may be need to be in to

enable a higher crossover point to be used

,

(see ,).

Using the WPG-202 Series of Electronic as a 3 way mono crossoverIn the stereo mode the switch (12) in the picture should

, ,be in the in position. The mono signal should be

inserted at the rear of the unit into channel one only.

The 3 outputs (high, mid and low) should go to the

power amplifier(s). There are clear legends on the rear

showing these input and outputs for the two operating

modes (mono and stereo). To operate set the input

level on channel 1 (left) so that the signal peak

indicator is not flashing constantly (the LED may flash

occasionally but this does not necessarily mean an

overload is occurring). Set the crossover frequency for

low/mid control (8) and adjust the low level output (7)

and mid level output (10) to the desired output levels

,

(see below Selecting the right crossover,

frequencies ). Select via control no.15 the crossover

point between mid and high and adjust control no.14 for

the high output level.

For this the mono mode switch (16) may be need to be

, ,in to enable a higher crossover point (see below

W P G S E R I E S P R O F E S S I O N A L E

, ,Selecting the right crossover frequencies ).

Selecting the right Crossover ConfigurationWhether you choose stereo 2 way or mono 3 way is

usually dependent on your system. Whether you run

true stereo or not is important. A typical 2 way stereo

system would consist on each side a bass bin and a

mid/high loudspeaker with an internal passive

crossover. The crossover would control the frequency

and output level to the bass loudspeaker and the

mid/high loudspeaker. For a simple low/high stereo

system one WPG-202 in stereo mode is ideal and is

the easiest to set up, as you only require one stereo

power amp. A three way system in stereo would require

2 WPG-202 units, each in mono mode, and effectively

3 stereo power amps (one for each band, low, mid and

high). This set up of discrete crossover channels for

each stack of speakers offers increased flexibility and

control for consistent, optimum sound quality. If you ran

a 3 way system mono with one WPG-202 you would

only require 3 channels of power i.e two stereo power

amplifiers with one channel spare for monitors or in

reserve.

Selecting the right Crossover FrequenciesMost speaker/cabinet manufacturers supply low and/or

high frequency cut-off points for each driver. These cut-

off (crossover points) frequencies are badec on the

loudspeaker/drivers performance at and beyond this

point, with a safety margin built in to accommodate

gentler filter roll-offs. Be careful to operate speaker

components within their recommended limits. This will

allow a safety margin so that the crossover points can

be adjusted without damaging the system. Please

remember that the power requirements for high

frequency (Compression drivers/horns) units are far

lower than for low/mid because the sound from a horn

will be far more efficient. This requires careful setting of

the mid/high controls in two way stereo and the high

control in mono mode to minimise the risk of damage to

the speaker units.

TYPICAL WIRING DIAGRAM FOR 2 WAY STEREO OPERATION OF THE WPG - 202 SERIES CROSSOVER

SIGNAL INPUTMIC, CD etc. TO MIXER

MIXEROUTPUT

INPUT TO OPTIONALSIGNAL PROCESSORi.e GRAPHIC EQUALISER

OUTPUTS TO CROSSOVER

INPUTS TO CROSSOVER

SEPARATEHIGH/MIDAND LOWOUTPUTS TOAMPLIFIER(S)FROMCROSSOVER

INPUTS TO AMPLIFIER(S) SEPARATELOWSPEAKEROUTPUT TOLOWFREQUENCYSPEAKERFROMAMPLIFIER

SEPARATEHIGH/MIDSPEAKEROUTPUT TOHIGH/MIDSPEAKERFROMAMPLIFIER

= SIGNAL (SHIELDED) CABLE

= LOUDSPEAKER (NON-SHIELDED) CABLE

L E C T R O N I C C R O S S O V E R M A N U A L

T E C H N I C A L S P E C I F I C A T I O N

FREQUENCY RESPONSE: 20Hz - 20kHz +3dB

THD: <0.03%

HUM AND NOISE: -94dB

LEVEL CONTROL RANGE: 0~6dB

INPUT IMPEDANCE: 10K ohm (BALANCED)

OUTPUT IMPEDANCE: <600 ohm (BALANCED)

MAX OUTPUT LEVEL: 22dBm (BALANCED)

MAX: INPUT LEVEL: 22dBm (BALANCED)

FREQUENCY RANGE: 50Hz - 10kHz

HIGH CUT FILTER: 15kHz 12dB/OCTAVE

LOW CUT FILTER: 40Hz 12dB/OCTAVE

CD HORN EQUALISATION: 3kHz

POWER CONSUMPTION: 12 VA

POWER: 95V ~130 VOLTS AC, 50 - 60Hz

190V ~250 VOLTS AC, 50 - 60Hz

DIMENSIONS: (HEIGHT . WIDTH . DEPTH) 483 x 160 x 44 mm / 19 x 6.3 x 1.7 inches

WEIGHT: 2.7Kg (6lbs)

-

POWER SUPPLY FOR WPG SERIES ELECTRONIC CROSSOVER.UK DISRIBUTED UNITS COME WITH FITTED MAINS PLUG, 250V13 AMP, BS1363/A I.S.40/A

W P G S E R I E S P R O F E S S I O N A L E

2 1

3

1 2

3

BALANCED INPUT WIRING TO WHARFEDALE PRO UNIT WITH XLR CONNECTORS

BALANCED OUTPUTSIGNAL DIRECTION

INPUT to Wharfedale Pro unit

Ground (earth) CABLE Only connect ground if hum occurs

,, BALANCED INPUT WIRING TO WHARFEDALE PRO UNIT WITH 1/4 JACK to XLR CONNECTORS

SIGNAL DIRECTIONBALANCED OUTPUT

INPUT to Wharfedale Pro unit

1 2

3Ground (earth) CABLE Only connect ground if hum occurs

SLEEVE

RING

TIP

RING

2 1

3

1 2

3

BALANCED OUTPUT WIRING FROM WHARFEDALE PRO UNIT WITH XLR CONNECTORS TO BALANCED UNIT

OUTPUT from Wharfedale Pro unit

SIGNAL DIRECTION

BALANCED INPUT

Ground (earth) CABLE Only connect ground if hum occurs

TIP

SLEEVEGround (earth) CABLE

TIPSLEEVE

INPUT to Wharfedale Pro unitSIGNAL DIRECTIONOUTPUT

INPUT SIGNAL DIRECTIONOUTPUT Wharfedale Pro unit

,,UNBALANCED INPUT AND OUTPUT WIRING WITH MONO 1/4 JACK CONNECTIONS

2 1

3Ground (earth) CABLE Only connect ground if hum occurs

RING

SIGNAL DIRECTIONINPUT to

Wharfedale Pro unit

TIP

SLEEVE

,,BALANCED INPUT WIRING TO WHARFEDALE PRO UNIT WITH XLR CONNECTORS to STEREO 1/4 JACK

BALANCED OUTPUT

TIP

SLEEVEGround (earth) CABLE Only connect ground if hum occurs

SLEEVE TIP

RING

SIGNAL DIRECTIONINPUT to Wharfedale Pro unit

,,BALANCED INPUT WIRING TO WHARFEDALE PRO UNIT WITH STEREO 1/4 JACK to XLR CONNECTORS

BALANCED OUTPUT

A great deal of mistakes in soundinstallations can be down to wronglywired audio connections. It is important that the connections are correct to suit your system.Unbalanced SystemAn unbalanced audio system is typically a single conductor shieldedwith the centre conductor relaying thesignal and the shield at ground.Balanced SystemUsing a balanced audio system is where a two conductor shielded cablehas each of the two centre conductorscarrying the signal but of oppositephase. This gives each conductor an equal but inverted potential differencefrom that of the ground.

It is recommend that you use balancedaudio connections if the unit beforeyour crossover has a balanced output. This will eliminate interferencesuch as mains hum. For the best results common grounding should be avoided. This means not connecting the ground on both the crossover input and output connectors. Wharfedale Pro advise that you connect the ground (shield) of the input connecting cable to the ground of the signal source while making sure the ground (shield) is not connected to the crossover input connector. The output cable connector from the crossover when connecting to an amplifier should have the ground(shield) connected. The inputconnector ground (shield) to the amplifier should not be connected.This is the process by which the ground (shield) is connected (tied) atthe source unit but is not connected to the destination unit. If hum develops in some instances the ground (shield)can be connected on the input. Somemanufacturers have units thatrecommend that the input connectorground (shield) is tied and the outputdisconnected. In this instance you mayneed to connect the input connectorground (shield) going to the input of the Wharfedale Pro unit.If an unbalanced system is used withXLR connections please connect pin 3to pin 1 (ground) of the connector. Thiswill mean that pin 2 transports the positive (+ / hot) signal. If pin 1 and 3are not connected this results in the

, ,negative (- / cold) input being open .This will give an audible degradation ofthe signal to noise ratio. This wouldrelate to both the input and outputconnectors and involve the cableground (shield) connected at both.

Please note that some manufacturersrun their units with pin 2 (- / cold) andpin 3 (+ / hot). This should be lookedout for and then the wiring could bemodified with labelled cables so thatconnections of + / hot go to theircorresponding + / hot etc. Somemanufacturers run their units withbalanced inputs and unbalancedoutputs, therefore care should be taken with the connections wheninserted into the system.

L E C T R O N I C C R O S S O V E R M A N U A L

Thank you for buying a Wharfedale WPG Series Pro Graphic Equalizer Unit. These units can be used with other Wharfedale Pro Units of which details can be obtained from your dealer.

EVP Series of High Performance LoudspeakersWPG-202 Two channel Electronic Crossover SE Series of Power Amplifiers

Lix Series of High Performance LoudspeakersAction Series Mixers

The information in this manual is subject to shange without notice.

cAll rights reserved 1998 Wharfedale Pro, IAG group

Wharfedale International LimitedSovereign Court Ermine Business Park

Huntingdon, Cambs PE29 6XU , England.

WHARFEDALE website: www.wharfedale.co.uk

911.344