TLA EQ1 manual - fra www.interstage.dk
Contents
1. 1500g 1n2 HM Band Typical Response 40k 10k 1k Frequency Hz 100 10 soog ND LM Band Typical Response SERVICE Should the EQ 1 require 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 EQ 1 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 misuse 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 purchased Dealer entren interstage Phistersvej 31 2900 Hellerup Danmark Telefon 3946 0000 fax 3946 0040 www interstage dk pro audio with a smile2. the cut boost controls to their centre or flat position The EQ is brought into circuit with the 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 band filters is approximately 0 5 around 2 octaves 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 Please note that the signal is routed through the four valve stages only when the EQ switch is engaged To benefit from the valve circuitry without EQ ing the input signal simply engage the EQ switch but leave the EQ set flat 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 bass guitar keyboard or high
3. EQ 1 VALVE CLASSICS by TL Audio User Manual LIMITED EDITION VALVE EQUALISER TL Audio Limited Sonic Touch Iceni Court Icknield Way Letchworth SG6 1TN England Tel 44 0 1462 680888 Fax 44 0 1462 680999 E Mail info tlaudio co uk www tlaudio co uk 1 SO LUDN311U 831114 431113 Wt 30815 37190 b 29815 307190 HILIMS SSUdA8 YII TAH indina 2 00 18 T 914 S3I 4I dU 390417100 843111 3H 47 39815 ANN 2 39815 38358 qma 0 9 INANI INIT 141 4 80 HOLIMS 3NIT 23IH wd E o LANI 21H 1NIOd j NOILAJSNI N8b WOLNYHd INTRODUCTION The TL Audio EQ 1 Dual 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 l A 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
4. 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 604 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 The line inputs and outputs are also duplicated on unbalanced quarter inch jack connectors A front panel mounted auxiliary jack socket allows direct access to the channel A input and is suitable for guitars basses samplers and keyboards etc An insertion point is provided immediately after the input stage to allow a compressor or other processor to be used as required 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 auxiliar
5. al 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 20K Hz IMD 0 0396 All specified for line input at OdBu 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 1 Power consumption 20VA typical Detachable 3 pin 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 25 20 15 10 40k 1 Frequency Hz 100 HF Band Typical Response isoog mo 40k Ik 10k Frequency Hz 100 10 LF Band Typical Response 40k 10k Ik Frequency Hz 100
6. e or hot Screen Ground Insertion Points The insertion points are interfaced via a 3 pin 0 25 switched jack socket on the 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 or hot 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 Signal Phase or hot Scre
7. ed 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 pin 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 Pin2 Signal Phase 4 or hot Pin 3 Signal Non Phase or cold Unbalanced inputs Pin 1 Ground screen Pin 2 Signal Phase 4 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 or hot Screen Ground Auxiliary Input A 2 pin mono jack plug is required which should be wired as follows Tip Signal Phas
8. en Ground MODE SWITCH EG 1 DUAL URLUE EQUALISER 7 120 250 500 2K2 3K6 SK 120 250 500 1K 2 2 3K6 SK 8K AUX INPUT 22 E 260 CARES 2k2 KS sk JK soa 5 i i EQ BYPASS SWITCH INPUT GAIN CONTROL MIC LINE SELECT SWITCH CUT RND BOOST CONTROLS FREQUENCY SWITCHES POWER SWITCH i PHANTOM POWER SWITCH FIG 2 FRONT PANEL CONTROLS UNBALANCED LINE INPUTS AND OUTPUTS DISCONNECT FROM MAINS BEFORE REMOVING COVER TL Rudio EQ 1 QUAL VALVE EQUALISER TO REDUCE RISK OF ELECTRIC SHOCK DO NOT EXPOSE TO RAIN OR MOISTURE UNBALANCE OUTPUTS NBRLRNEED INPUTS SERIAL NUMBER NO USER SERUICERBLE PARTS INSIDE REFER SERUICE TO QUALIFIED PERSONNEL B A 8 A aes IN WARNING THIS EQUIPMENT MUST BE EARTHED 9 MADE IN ENGLAND CHANNEL B INPUTS CHANNEL A INPUTS iod BALANCED OUTPUTS NOMINAL LINE MIC LINE CAUTION CHANNEL CHANNEL A EEE INSERTION POINTS 2 89 ENSURE CORRECT VOLTAGE Lo SET BEFORE CONNECTING TO RC MAINS SUPPLY 1098 REPLACE CORRECT NG RETURN suf PIN d RATING ONLY 51 PI GN PIN 2 FUSE INLET BALANCED NOMINAL OUTPUT INPUT SOCKETS OUTPUTS LEVEL SWITCH l VOLTAGE SELECTOR SWITCH INSERTION POINTS FIG 3 REAR PANEL Ventilation The EQ 1 generates a small amount of heat internally mainly due to the valve heaters This hea
9. impedance microphone 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 ideal for setting the level going to tape or hard disc Therefore the input signal should enter via the channel A input and the channel B output used as the overall mono output The channel A EQ In switch controls the first four bands of EQ whilst the channel B switch selects the second four bands Note that the channel B line input is disabled in this mode Mic Input Line Input SPECIFICATIONS Electronically balanced input impedance greater than 10Kohm to suit 150 600 ohm microphones 48 phantom power available via switch with red LED Gain range 16 to 60dB Noise EIN 127dBu 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 in
10. put level 30dBu 3 pin female XLR connector Unbalanced Input Input impedance greater than 5Kohm 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 50dB Maximum input level 2 pole 0 25 jack socket 4 bands per channel comprising 12dB shelving 4 switched frequencies at 60Hz 120Hz 250Hz and 500Hz LM 12dB bandpass 4 switched centre frequencies at 250Hz 500Hz and 2K2Hz approximately 0 5 Outputs HM 12dB bandpass 4 switched centre frequencies at 1K5Hz 2K2Hz 3K6Hz and 5KHz 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 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 OdB gain and EQ by passed 80dBu with EQ in and flat 4dBu nominal level 95dBu and 90dBu respectively at 10dBu nomin
11. t should be allowed to dissipate by convection through the grille in the front panel which must not be obstructed Do not locate the EQ 1 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 1 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 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
12. y 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 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 EQ 1 PRECAUTIONS The EQ 1 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 correct 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 EQ 1 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 us
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