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Table of contents for the manual
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Page 1
24CX-2 24CX-3 24CX-4 ELECTRONIC CROSSOVER OWNER’S MANUAL TDM AUDIO INC. 7270 BELLAIRE AVE. NORTH HOLLYWOOD, CA 91605 (818) 765-6200 TDMAUDIO.COM TDM A U D I O[...]
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© 2003 TDM Audio, Inc. Electronic Crossover Owner’s Manual Page 2 I MPORTANT ! *** Read Before Using *** CAUTION : The following must be observed to prevent malfunctioning and/or possible equipment damage. • Before plugging the unit into the main AC line, make sure that all of the equipment following the crossover output lines is turned of f o[...]
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© 2003 TDM Audio, Inc. Electronic Crossover Owner’s Manual Page 3 Table of Contents INTRODUCTION ................................................................................................................... .................................... 4 C ROSSOVER F UNDAMENTALS ......................................................................[...]
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© 2003 TDM Audio, Inc. Electronic Crossover Owner’s Manual Page 4 Introduction hank you for purchasing the TDM 24CX series el ectronic crossover . These units are made from the finest components and engineered to exacting standards. Precision components are used in all critical circuitry for the finest soni c quality and perform ance. T o get th[...]
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© 2003 TDM Audio, Inc. Electronic Crossover Owner’s Manual Page 5 Signal Sour ce Pow er Amplifie r Lo w T ransd ucer Mid T r ansduc er Hig h Tr ansd ucer Passive Crossover Figure 1 - Typical Passive Crossover Conf iguration This kind of crossover is called a passive crossover because it does not use any power other than the power contained in th[...]
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© 2003 TDM Audio, Inc. Electronic Crossover Owner’s Manual Page 6 • External Power: Passive crossovers are simply inserted between the am p and the speaker components. Active crossovers must be plugged into an electrical outlet in order to work. • Higher T ypical Rolloff Rates: Passive crossovers typically ro ll off at rates from 6 to 12 dB [...]
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© 2003 TDM Audio, Inc. Electronic Crossover Owner’s Manual Page 7 result in a greater overall ef ficiency of the system by making sure a band of frequencies is always reproduced by the speaker components that are most ef ficient at reproducing it. How Crossovers Work T o divide a range of frequencies into two or more smaller ranges, a crossover [...]
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© 2003 TDM Audio, Inc. Electronic Crossover Owner’s Manual Page 8 -45 -40 -35 -30 -25 -20 -15 -10 -5 0 5 380 500 620 740 860 980 1100 1220 1340 1460 1580 1700 1820 1940 2060 2180 2300 2420 2540 2660 2780 Frequency (Hz) Gain (dB) Figure 4 - 24 dB p er Octave Filter Curve T o make a 2-way crossover , we feed the same signal into a high-pass filter[...]
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© 2003 TDM Audio, Inc. Electronic Crossover Owner’s Manual Page 9 The crossover frequency of 1000 Hz is where the two lines on this graph cr oss over each other . In crossovers with three or more output bands, there are two filters for each of the middle bands. A low-pass filter rolls off frequencies above a cer tain cutoff point. A high-pass fi[...]
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© 2003 TDM Audio, Inc. Electronic Crossover Owner’s Manual Page 10 Mounting the Unit in a Rack DM 24CX series crossovers can be mounted in any standard 19” rack. Each TDM 24CX series crossover takes up one rack space. T o ma ke m ounting easier , lay the rack on its back with the equipment front panels facing up. Rem ove any rack screws from t[...]
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© 2003 TDM Audio, Inc. Electronic Crossover Owner’s Manual Page 11 Hooking Up the Crossover nce your TDM crossover is installed in the rack, you are ready to hook it up to your equipment. Of course, the method used to hook up any crossover depends on how it will be used. W e will try to give you the basics in this m anual, but you may need to ta[...]
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© 2003 TDM Audio, Inc. Electronic Crossover Owner’s Manual Page 12 It is very important that both pins 1 and 3 are wired to the sleeve. Som e adapters leave pin 3 floating, and with TDM crossover units this will cause problem s. If you have a TDM 24CX series crossover with ¼” connectors, you m ay connect directly to other equipment using ¼?[...]
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© 2003 TDM Audio, Inc. Electronic Crossover Owner’s Manual Page 13 channels to link them together and form one th ree-way channel. This switch m ay be found on the rear of the unit between the channels. It is rece ssed into the chassis through a small, square hole, and you might need to use a small screwd river to press it. When it is in the in [...]
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© 2003 TDM Audio, Inc. Electronic Crossover Owner’s Manual Page 14 Operating the Crossover nce you have mounted your TDM 24CX series cro ssover in a rack and connected all of the cables, the unit is ready for operation. At this time, make sure the input levels on the front of the crossover and the input levels of the amplifiers are all the way d[...]
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© 2003 TDM Audio, Inc. Electronic Crossover Owner’s Manual Page 15 Channel One (or Three) Input Level Input Level Channel One (or Three) Crossover Frequency High-T o-Mid Crossover Frequency Channel One (or Three) Range Switch High-T o-Mid Range Channel One (or Three) High Output Level High Output Level Channel One (or Three) Low Output Level Not[...]
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© 2003 TDM Audio, Inc. Electronic Crossover Owner’s Manual Page 16 Checking the Hookup It is critical that the crossover is connected and adjusted correctly before use. T o avoid speaker damage, we recomm end checking your hookup and settings using the following method. 1. Make sure the input level and all output le vels on the crossover are dow[...]
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© 2003 TDM Audio, Inc. Electronic Crossover Owner’s Manual Page 17 Adjusting the Output Levels S tart with the input levels at 0 dB (unity gain). After the rest of the system has been dialed in (amplifier gains and output levels), the input levels can be fine tuned. Feed a lower-than-norm al level signal from your signal source into the system. [...]
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© 2003 TDM Audio, Inc. Electronic Crossover Owner’s Manual Page 18 TDM Option Cards he TDM 24CX series crossovers have intern al connectors for option cards. A variety of dif ferent option cards is available from TDM. Plugging a card into the connector inserts the circuitry on the card between a crossover secti on output and the output of the un[...]
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© 2003 TDM Audio, Inc. Electronic Crossover Owner’s Manual Page 19 Optional Output Limiters he TDM 24CX series crossovers can be ordered with output lim iters. These let you set the maximum level for each crossover output. Limiters are used to help protect speaker components and ears from dam age by excessive levels. Levels above the preset thre[...]
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© 2003 TDM Audio, Inc. Electronic Crossover Owner’s Manual Page 20 Troubleshooting and Support his section details various problems that you might encounter when using your crossover , and the possible causes and solutions. It also tells how to contact TDM when you need service or support for your 24CX series crossover . No Signal Output If you [...]
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© 2003 TDM Audio, Inc. Electronic Crossover Owner’s Manual Page 21 is the cause of the distortion. If none of the si gnal processing units in the chain is causing the distortion, then either it is present in the signal source, or there is a problem with your speaker system, amplifiers, or crossover . If you determine that the TDM 24CX series cro[...]
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© 2003 TDM Audio, Inc. Electronic Crossover Owner’s Manual Page 22 two dif ferent grounds. The problem is m ost often caused by a single piece of equipment grounded to two dif ferent power sources that are located some distance apart. For example, a mixing console is plugged into a grounded outlet at the back of an auditorium, and the power ampl[...]
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Specifications Frequency Response Low Frequency Output +0-0.5 dB 10 Hz High Frequency Output +0-1.0 dB 20 kHz Total Harmonic Distortion R L > 2 kohms Low Frequency Output <0.01% THD High Frequency Output <0.02% THD Maximum Output Level R L > 2 kohms +21 dBu (6.2 volts) @ < . 0 5 % T H D Maximum Voltage Gain 6 dB Constant-Directivity [...]