User Manual
Contents
1. 3 pin male XLR connector Unbalanced Outputs Output impedance 47 ohms Maximum level 20dBu into 10Kohms 2 pole 0 25 jack socket Frequency Response Noise 20Hz to 20KHz 0 1dB with EQ by passed or flat Noise floor 85dBu with line input at 04 gain and EQ by passed 80dBu with EQ in and flat 4dBu nominal level 95dBu and 90dBu respectively at 10dBu nominal level 3 pin male XLR connector Dynamic Range Mode Switch 105dB EQ in and flat 4 band dual channel or mono 8 band Channel B level control becomes master output level in mono mode Distortion THD N 0 02 at 1KHz 0 08 20Hz 20KHz IMD 0 03 All specified for line input at and OdB gain EQ in and flat after 10 minute warm up time Insertion Points Unbalanced switched 3 pin jack socket tip send ring return Nominal level 2dBu Output impedance 47 ohms Return input impedance 10Kohms Power Requirements Dimensions Weight Rear panel selectable for 220 240V 50Hz or 110 120V 60Hz operation Rear panel fuse 20mm 1AT Power consumption 20VA typical Detachable 3 pin IEC connector mating connector and cable supplied Front panel On Off switch with green LED 19 rack mounting 2U high 483mm wide x 88mm high x 205mm deep 4Kg In line with a policy of continuous development the above specifications are subject to change without notice SERVICE Should the equaliser r2. CHANNEL A L INSERTION POINTS ENSURE CORRECT VOLTAGE Lee SET BEFORE CONNECTING AC MAINS SUPPLY gt REPLACE WITH CORRECT TYPE ANO RATING ONLY SEND RING RETURN SLAEVE GND PI GNA PIN 2 PIN 3 79E FUSE TEC INLET BALANCED NOMINAL OUTPUT INPUT SOCKETS OUTPUTS LEVEL SWITCH VOLTAGE SELECTOR SWITCH INSERTION POINTS FIG 3 REAR PANEL AUX INPUT MODE SWITCH EQ 1 DUAL VALVE EQUALISER 120 250 2 2 3K6 120 250 1K 2K2 5 500 3K6 SK INPUT 260 xs lt A 10 a 500 250 Od x TL Audio 12K o o 0 0 0 BAND 1 Hz Hz Hz Hz Hz Hz Hz Hz p PONER EQ 480 a a 8 GAIN LF Ln 9 te 16 GAIN eo LF un HM ayo BYPASS SWITCH INPUT GAIN CONTROL H CUT AND BOOST CONTROLS ai POWER SWITCH FREQUENCY SWITCHES PHANTOM POWER SWITCH FIG 2 FRONT PANEL CONTROLS POWER o 480 INSERTION OUTPUT AMPLIFIER BYPASS SWITCH MIC INPUT OUTPUT E MIC LINE INPUT SWITCH AMPLIFIER LINE INPUT eS VALVE STAGE 2 VALVE STAGE 3 VALVE STAGE 4 VALVE STAGE 1 LF HF LM FILTER FILTER FILTER VOL TAGE AMPLIFIER ATTENUATOR FIG 1 BLOCK DIAGRAM INTRODUCTION The
3. Pin 3 Signal Non Phase or cold If an unbalanced output is required pins 1 and 3 should both be connected to ground Nominal Output Level A switch on the rear panel allows the output to be matched to equipment at a nominal operating level of 4dBu or 10dBu Most professional equipment requires 4dBu approximately 1 2V rms but some small mixing consoles portable tape recorders or domestic audio equipment require 10dBu approximately 225mV rms The switch should be set to the position which results in the best signal to noise ratio whilst preserving sufficient headroom Unbalanced Outputs An unbalanced line output is provided for each channel on a 0 25 mono jack socket Tip Signal Phase hot Screen Ground Ventilation The unit generates small amount of heat internally mainly due to valve heaters This heat should be allowed to dissipate by convection through the grill in the front panel which must not be obstructed Do not locate the EQ unit where it will be subject to external heating for example in the hot air flow from a power amplifier or on a radiator The EQ may be free standing or mounted in a standard 19 rack Rear Panel The rear panel connectors are identified in fig 3 OPERATION Front Panel The front panel controls are identified in fig 2 Input Stage Ensure that the correct input connector mic or line is being used and
4. T L Audio Valve Equaliser combines classic valve techniques with low noise solid state circuitry to produce a unit offering four bands of EQ on each of its two channels Both channels feature a line level input plus a mic input with switchable 48V phantom powering Further flexibility is provided from a front panel auxiliary input and Mono 8 Band operation mode Typical applications include direct recording to tape instrument preamplifier use as outboard EQ during mixdown and as a main stereo equaliser for monitoring and PA systems The block diagram of one of the channels is shown in fig 1 solid state electronically balanced input amplifier is used to achieve state of the art performance with very low noise low distortion and wide bandwidth Two XLR input sockets are provided per channel for mic and line inputs The mic input is suitable for low impedance 150 600 ohm microphones with a gain control range of 16 to 60dB A front panel switch provides 48V phantom power to both channels The line input has an effective overall gain range of 10 to 35dB allowing the valve stages to be fully driven from line level signals in the range 20 to 20dBu A front panel mounted auxiliary jack socket allows direct access to the channel A input It is a high impedance high gain input suitable for guitar bass etc An insertion point is provided immediately after the input stage to allow a compressor or other processor to be used as required
5. switch with red LED Gain range 16 to 60dB Noise EIN 127Bu at maximum gain with a 150 ohm termination measured 22Hz 22KHz unweighted Maximum input level 10dBu 3 pin female XLR connector Electronically balanced unbalanced compatible with input impedance greater than 5Kohm Gain range 10dB to 35dB suitable for nominal input levels from 20dBu to 20dBu Maximum input level 30dBu 3 pin female XLR connector Unbalanced Input Input impedance greater than 5 Gain range 10dB to 35dB suitable for nominal input levels from 20dBu to 20dBu Maximum input level 30dBu 2 pole 0 25 jack socket Auxiliary Input Equalisation Input impedance 100Kohms maximum gain 504 Maximum input level 04 2 pole 0 25 jack socket 4 bands per channel comprising LF 12dB shelving 4 switched frequencies at 60Hz 120Hz 250Hz and 500Hz LM 12dB bandpass 4 switched centre frequencies at 250Hz 500Hz 1KHz and 2K2Hz Q approximately 0 5 Outputs HM 12dB bandpass 4 switched centre frequencies at 1K5Hz 2K2Hz 3K6Hz and 5KHz Q approximately 0 5 HF 12dB shelving 4 switched frequencies at 2K2Hz 5KHz 8KHz and 12KHz EQ on switch with green LED Electronically balanced unbalanced compatible Rear panel selectable for 4dBu or 10dBu nominal level Output impedance less than 10 ohms Maximum level 26dBu into 10Kohms 22dBu into 600 ohms 4dBu nominal balanced
6. T L Audio User Manual EQ1 VALVE EQUALISER Tony Larking Professional Sales Limited Letchworth England Tel 01462 490600 International 44 1462 490600 Fax 01462 490700 International 44 1462 490700 10k 4 1k Frequency Hz 100 20 15 soog ing Band Typical Response 10k lk KN x f NY 100 N N 500 A a t i Frequency Hz LM Band Typical Response 1 V Frequency Hz HF Band Typical Response 10k ik 100 Isoog inND 20 10 25 Frequency Hz LF Band Typical Response UNBALANCED LINE INPUTS AND OUTPUTS AN DISCONNECT FROM MAINS BEFORE REMOVING COVER TL Audio EQ 1 DUAL VALUE EQUALISER REDUCE RISK OF ELECTRIC SHOCK DO NOT EXPOSE TO RAIN OR MOISTURE UNBALANCED OUTPUTS INPUTS SERIAL NUMBER NO USER SERVICEABLE PARTS INSIDE REFER SERVICE TO QUALIFIED PERSONNEL WARNING THIS EQUIPMENT MUST BE EARTHED lt MADE ENGLAND CHANNEL INPUTS CHANNEL A INPUTS soe BALANCED OUTPUTS NOMINAL LINE LINE 250v CAUTION CHANNEL
7. The insertion point is unbalanced at a nominal operating level of 2dBu The EQ section uses two twin triode valves per channel arranged as a voltage amplifier followed by three active EQ stages The first EQ stage provides shelving LF and HF filters followed by individual stages for the low mid and high mid peaking filters Increasing the gain at the input stage allows the unique overdriven valve sound to be gradually introduced The EQ stages may be bypassed for easy A B comparison The Mode switch allows selection of dual channel operation with four EQ bands per channel or cascaded 8 band operation In the mono 8 band mode the channel A mic line input or auxiliary input is processed by the four band EQ of channel A followed by the four bands of channel B The channel B gain control operates as a master output level control in this mode A solid state electronically balanced output stage completes the channel All inputs and outputs are also compatible with unbalanced signals The outputs are switchable for 4dBu or 10dBu nominal output level Please read this manual fully before installing or operating the Equaliser PRECAUTIONS The T L Audio Valve Equaliser requires very little installation but like all electrical equipment care must be taken to ensure reliable safe operation The following points should always be observed All mains wiring should be installed and checked by a qualified electrician Ensure the corr
8. d filters is approximately 0 5 to cut or boost a moderately broad bandwidth over a 12dB range The shelving filters also provide 12dB of cut and boost over the full range of frequencies below the LF corner frequency and above the HF corner frequency Used individually or in combination the filter bands allow comprehensive equalisation of any audio signal with the unique character of valve circuitry Typical response curves for each band are shown in the specification section of this manual Auxiliary Input The front panel auxiliary input socket accepts low level signals from a guitar or high impedance microphone as described above Plugging a jack plug into the auxiliary socket automatically disconnects the channel A mic or line inputs and replaces them with the aux input Mode Switch The Mode switch selects between dual channel operation with four bands of EQ per channel and mono 8 band operation In mono 8 band mode the input from channel A or the aux input is controlled by the channel A gain control and then processed by all 8 bands of EQ The channel B gain control functions as a master output level control in this mode The channel A EQ In switch controls the first four bands of EQ whilst the channel B switch selects the second four bands Mic Input Line Input SPECIFICATIONS Electronically balanced input impedance greater than 10Kohm to suit 150 600 ohm microphones 48 phantom power available via
9. ect operating voltage is selected on the rear panel before connecting to the mains supply Never operate the unit with any cover removed Do not expose to rain or moisture as this may present an electric shock hazard Replace the fuse with the correct type and rating only Warning This equipment must be earthed INSTALLATION AC Mains Supply The equaliser is fitted with an internationally approved 3 pin IEC connector A mating socket with power cord is provided with the unit wired as follows Brown Live Blue Neutral Green Yellow Earth Ground All mains wiring should be performed by a qualified electrician with all power switched off and the earth connection must be used Before connecting the unit to the supply check that the voltage selector switch on the rear panel is correctly set The unit may be set for 115V accepting voltages in the range 110V to 120V 60Hz AC or to 230V for voltages in the range 220V to 240V 50Hz AC The fuse required is 20mm anti surge 1AT Warning attempted operation on the wrong voltage setting or with an incorrect fuse will invalidate the warranty Audio Inputs Each channel has two female 3 XLR connectors for mic and line sources Both are compatible with either balanced or unbalanced signals when the mating connectors are appropriately wired Balanced inputs Pin 1 Ground screen Pin 2 Signal Phase or hot Pin 3 Signal Non P
10. equire service it must be taken or posted to an authorised dealer Please retain the original packing for possible future use and ensure the unit is suitably protected during transit The manufacturer cannot accept responsibility for damage caused during transportation The equaliser is protected by a limited warranty for a period of one year from the date of purchase During this period any faults due to defective materials or workmanship will be repaired free of charge The warranty excludes damage caused by deliberate or accidental missue operation on the incorrect mains voltage or without the correct type and value of fuse fitted It is the user s responsibility to ensure fitness for purpose in any particular application The warranty is limited to the original purchase price of the equipment and excludes any consequential damage or loss Please record the following details Serial Date Dealer Tony Larking Professional Sales Limited Letchworth England Tel 01462 490600 International 44 1462 490600 Fax 01462 490700 International 44 1462 490700
11. hase cold Unbalanced inputs Pin 1 Ground screen Pin 2 Signal Phase or hot Pin 3 Signal Ground When using unbalanced signals the signal ground may be obtained by linking pins 1 and 3 in the mating XLR connector Good quality screened cable should be used particularly for microphone or low level sources to prevent hum or noise pickup Unbalanced Line Inputs An unbalanced line level input is provided for each channel on a 0 25 mono jack socket The mating plugs should be wired as follows Tip Signal Phase hot Screen Ground Auxiliary Inputs A 2 pin mono jack plug is required which should be wired as follows Tip Signal Phase hot Screen Ground Insertion Points The insertion points are interfaced 3 pin 0 25 switched jack socket on rear of the unit The pin connections are Sleeve Ground Tip Send Ring Return The insertion point is unbalanced and operates at a nominal level of 2dBu If used as an additional send only e g as a send to a tape machine or monitor mixing desk the Tip and Ring should be wired together to preserve the signal path through the insertion point Outputs The outputs are via balanced 3 pin male XLR connectors The mating connectors should be wired as follows Pin 1 Ground screen Pin 2 Signal Phase
12. that the front panel switch is set to the appropriate position Note that both mic and line inputs may be connected at the same time but only one is selected 48V phantom power is available at the mic socket The switch at the right hand side of the front panel provides phantom power to both channels signalled by a red LED CAUTION Operation of the phantom power switch or plugging a microphone in with phantom power applied may cause a click or thump in your loudspeakers To prevent this happening ensure that the system gain is set to minimum e g on your mixing console fader or power amplifier before operating the switch or plugging in a microphone If the gain required is not known set the control to minimum with the EQ by passed and gradually increase the gain until the required output level is achieved Equalisation Before switching the EQ into circuit it is advisable to set the cut boost controls to their centre or flat position The EQ is brought into circuit with the On push switch signalled by a green LED Each channel has four bands of equalisation shelving low frequency LF peaking low mid LM peaking high mid HM and shelving high frequency HF Each band has a continuously variable cut and boost control plus a four position frequency switch The frequency switch sets the centre frequency of the LM and HM peaking filters and the corner frequency of the LF and HF shelving filters The Q of the mid ban
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