Owner’s Manual SEQ-2 Stereo Five-Band Graphic Equalizer *TD-004031-00* Rev.
SEQ-2 STEREO FIVE-BAND GRAPHIC EQUALIZER I. DESCRIPTION The SEQ-2 is an embedded stereo (dual-channel) five-band graphic equalizer accessory for use with select QSC power amplifiers. Compatible amplifier models and lines, both current and discontinued, include: • All PLX, two-channel CX, and two-channel DCA models (with a BSC-3 or BSC-5 BusCard installed) • All four-channel CX and DCA models (with a BSC-7 BusCard installed) • PowerLight models PL 1.0, PL 1.0HV, PL 1.4, PL 1.5X, PL 1.6HVX, PL 1.
III. PROGRAMMING THE SEQ-2 The SEQ-2 circuit board has two 3-pin headers, and two groups of five trimmer potentiometers, or trimpots (see Figure 2); all are used for programming the module. The circuitry for the two channels is identical. Depending on its position on some BusCards, the SEQ-2’s bypass/engage jumpers and headers may not be easily accessible once the accessory is installed; on such units, configure the jumpers before installing the accessory on the BusCard.
Installing the SEQ-2 Tools and materials you will need: • Soldering iron • Desoldering iron or other suitable desoldering equipment • Phillips screwdriver • Wire cutters • Rosin-core solder • Non-conductive alignment tool (slot type), for adjusting trimpots The SEQ-2 contains active components which can be damaged by electrostatic discharge (ESD). Be sure to practice standard ESD precautions and always ground yourself and your workstation before handling exposed circuit cards.
wire jumpers “Mini Slot” Figure 7. Input card of an EX Series amplifier. MXa Series input cards are fairly similar. Figure 6. Input card of a legacy CX Series amplifier 5. Next, unsolder and remove the wire jumper pairs (W305/W306 and W405/W406 on EX Series amplifiers; W303/W304 and W403/W404 on MXa and legacy CX Series amplifiers). Under or next to where the jumpers were is arow of solder holes, with one section of 10 holes and another with 12.
Setting up the SEQ-2 The SEQ-2’s equalization settings may be adjusted only while the amplifier chassis is open (on BusCard-equipped models) or while the input card is removed (on models using Open Input Architecture), because the trimpots are inaccessible once the amplifier chassis is closed. CAUTION: Sometimes it may be necessary to adjust the SEQ-2 while the amplifier is running.
VI. TECHNICAL ASSISTANCE & SERVICE Only a qualified technician should service your QSC product. There are no user serviceable components inside the unit and the risk of electric shock exists. Also, some components in your unit may require specific QSC replacements. Technical Assistance If you suspect that your SEQ-2 is defective, check your system configuration and SEQ-2 settings to determine the origin of the problem.
® A “QSC” is a registered trademark of QSC Audio Products, Inc. U D I O 1675 MacArthur 10 Blvd.
