DUAL TUBE EQ PROFESSIONAL TWO CHANNEL TUBE PARAMETRIC EQUALIZER USER’S GUIDE
Table of Contents Introduction Features Registration Overview EQ Tips Unpacking AC Power Hookup Audio Connections Installation Safety Precautions Powering Up Front Panel Controls and Indicators Gain Control Clip Indicator Low Frequency Control Low Shift Switch Lo-Mid Frequency Control Low-Mid Shift x10 Switch Hi-Mid Frequency Control Hi-Mid Shift x10 Switch High Frequency Control High Shift Switch Output Level Control Bypass Switch Mono (cascade) switch Power Switch Rear Panel Connections Input Output Mono
Introduction Thank you for purchasing Applied Research and Technology’s Dual Tube EQ. The Dual Tube EQ may be used anywhere you need equalization or frequency adjustments. Offering a superb level of sound quality, the Dual Tube EQ will enhance the sonic textures of your studio or audio system for years to come. Features The Dual Tube EQ is a unique product. While every EQ gives you the ability to alter the frequency characteristics of a signal, very few sound really good when doing so.
Fill in the following for your future reference: Date of purchase: ___________________ Purchased From: ____________________ Serial Number: 258-________ Overview Great recordings and great mixes are made from great sounds. With the exception of some classical and environmental recordings, equalization plays a large role in creating, tweaking and capturing great sounds in contemporary music. A good equalizer will make good sounds sound better, and (more importantly) bad sounds sound better.
track during mixing, the Dual Tube EQ is a better sounding and more flexible equalizer. It all comes down to economics: Mixer manufacturers need to make trade-offs to keep prices down while keeping performance up. The use of external processing (equalizers, preamps and compressors) has sonic and practical benefits when you consider that most recording is done one or two channels at a time.
of the mid bands. Slowly sweep through the frequency range. When the really nasty sound jumps out at you (you’ll know it when it happens) turn the boost back to “0” (12 o’clock). Now put the track back into the mix and cut the frequency. You’ll have to adjust the level of the instrument depending on how much you cut, but you may find that with the “problem area” pulled out, the instrument works better in the mix.
AC Power Hookup The Dual Tube EQ has an internal power supply designed to operate at 100 to 125VAC, 50 to 60Hz. Units manufactured for use outside of the United States of America have been modified to comply with the required electrical specifications. Under no circumstances should the power cable be altered. If the cable becomes cut or damaged, discontinue its use and have it replaced before using the Dual Tube EQ.
power down. Note: Like all tube-based equipment, the Dual Tube EQ needs to warm up before being used. Allow one to two minutes for the tubes to reach proper operating voltage before using. It is normal for the Tube EQ to be warm. The aluminum chassis is used for heat dissipation. It is recommended that the Dual Tube EQ be installed in an area where there is adequate ventilation.
Low Frequency Control The Low Frequency control adjusts a shelving filter with a selectable corner frequency of either 40Hz or 120Hz. The low shelving filter designed into the Tube EQ affects all frequencies below the corner frequency when applying boost or cut. In other words, cutting at 40Hz also cuts 30Hz, 20Hz, etc. The Low Frequency control has as range of +/- 12dB. Two ranges are selected with the Low Shift Switch: 40Hz or 120Hz.
Hi-Mid Frequency Control The Hi-Mid control is a dual concentric pot (meaning there are two controls - one outer and one inner). The outer control is used to select a frequency while the inner control is used to apply +/-12dB of gain. The Hi-Mid control can cover two frequency ranges depending on the position of the Shift x 10 switch. These ranges are 200Hz to 2KHz and 2KHz to 20KHz.
Note: You’ll notice the High Frequency and Hi-Mid Frequency controls overlap (meaning they cover the same frequencies). This is intentional and is one of the powerful features of the Tube EQ. This feature allows you the ultimate in flexibility. For example, on cymbals try boosting 18KHz with the High control while cutting 20KHz with the Hi-Mid control for a very bright, yet noise free result. Output Level Control The Output Level control sets the output level of the Dual Tube EQ.
switch is depressed the LED will glow red and all eight-bands of the Dual Tube EQ are active for the signal connected to channel One’s input and output jacks (labeled channel 1/MONO on the rear panel). When this mode is used, the input and output level controls for channel two do not affect channel one. Another cool feature is that channel Two may be used as a “tube” channel when the Dual Tube EQ is in Mono/cascade mode.
used simultaneously. However, when using the Dual Tube EQ to convert an unbalanced signal to a balanced signal (and viseversa) you will experience a level difference between the input and output signals. This isn’t a big deal as you can compensate with the Input and Output Level controls, but the front panel “0” indicators will not be accurate unless using common connectors (both XLRs or both 1/4).
should give you a good place to start. APPLICATIONS The Tube EQ is intended for use with line level sources. The proper placement of the Dual Tube EQ in a signal chain is: after a mic/line preamplifier, after a direct output or bus output from a console, after the output of a tape deck, or in the insert point of a mixer. The Dual Tube EQ has gain and it is possible to plug an instrument directly into it.
A R T Dual Tube EQ Specifications Dimensions: Weight: Frequency Bands: Low Shelf: Low-Mid Sweepable: High-Mid Sweepable: High Shelf: Gain/Frequency Band: Dynamic Range: Input Impedance: Output Impedance: Maximum Input Level: Maximum Output Level: Total Harmonic Distortion (THD): Tubes: Power Requirements: 5.25"D x 19"W x 1.75"H 7.
WARRANTY AND SERVICE INFORMATION Limited Warranty Warranty service for this unit will be provided by Applied Research and Technology, Inc. in accordance with the following warranty statement. Applied Research and Technology, Inc. (A R T) warrants to the original purchaser that this product is free from defects in workmanship and materials for a period of three years from the date of purchase.
SERVICE The following information is provided in the unlikely event that your unit requires service. Use this procedure to return units in the United States only. For service outside the United States, please contact your authorized A R T distributor. 1) Be sure the unit is the cause of the problem. Check to make sure the unit has power supplied, all cables are connected correctly, and the cables themselves are in working condition.
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