User manual ART DUAL TUBE EQ

[. . . ] 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 connections Tube Replacement Instruments and the Audio Spectrum Applications Specifications On-line Information Warranty Information Service Information 2 2 2 3 3-5 5 6 6 6 6 6 7 7 7 8 8 8 8 9 9 9 9 10 10 10 11 11 11 11 12 12 12 13 14 14 15 16 258-5004-101 1 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. While every EQ gives you the ability to alter the frequency characteristics of a signal, very few sound really good when doing so. [. . . ] Turn the control clockwise to increase gain and counterclockwise to decrease it. To maximize your signal to noise ratio, it is important to start with a unity gain setting (meaning that the level into the Tube EQ is the same as the level out of the Dual Tube EQ). With the output level at its "0" position, adjust the input gain until the level is the same when the Dual Tube EQ is bypassed and active. Clip Indicator The Clip indicator will illuminate just before any gain stage of the Tube EQ reaches audible distortion. Typically this will indicate clipping at the input stage (which is corrected by turning down the input gain control). However, it will also indicate any distortion caused by excessive EQ'ing. In other words, if turning down the input gain control doesn't make the clip indicator turn off, check the frequency bands for excessive boost. 7 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. Note: You'll notice the Lo-Mid and Hi-Mid Frequency controls overlap (meaning they cover the same frequencies) in the 200Hz to 2KHz range. This is intentional and is another of the powerful features of the Tube EQ. This is extremely useful if you want to cut at 200Hz and boost at 350Hz. High Frequency Control The High Frequency control adjusts a shelving filter with a selectable corner frequency of either 6KHz or 18KHz. The high shelving filter designed into the Tube EQ affects all frequencies above the corner frequency when applying boost or cut. Cutting 6KHz can also help to "take the edge off" brittle or harsh sounding instruments. 18KHz may be used to add "sizzle" to cymbals and is generally referred to as the "air" band. While there aren't very many instruments that contain 18KHz information directly, many instruments and mixes contain upper harmonics which can add extra definition and "space" when boosted. High Shift Switch The High Shift switch selects the corner frequency of the High Frequency control. In the "in" position the corner is 6KHz. 9 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. 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. The output level is a gain stage intended to compensate for a boost or cut in level from the applied EQ. [. . . ] The Dual Tube EQ has gain and it is possible to plug an instrument directly into it. However, the Dual Tube EQ does not have enough gain to properly preamplify a microphone plugged directly into it. ~ Direct to Tape through Pro MPA, Pro VLA and Dual Tube EQ ~ ~ In the Channel Insert of a Mixer ~ CHANNEL INSERT SEND CHANNEL INSERT RETURN 13 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. 0 lbs 40Hz/120Hz Selectable 20Hz to 200Hz/ 200Hz to 2KHz 200Hz to 2KHz/ 2KHz to 20KHz 6KHz/18KHz Selectable +/- 12dB >90dB (no weighting) 20k ohms (XLR), 1M Ohm (1/4") 600 ohms (XLR), 300 Ohms (1/4") +22dBu (XLR) +27dBu (XLR), +22dBu (1/4") <0. 1% 2 Hand Selected 12AX7a 100-125 VAC, 16W (Export units configured for country of destination) A R T retains a policy of constant product improvement. A R T reserves the right to make changes in design or make additions to or improvements upon this product without any obligation to install the same on products previously manufactured. 215 Tremont Street Rochester, NY 14608 USA (716) 436-2720 (Phone) (716) 436-3942 (FAX) WE'RE ON-LINE! [. . . ]