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- 24CX-2
- Owner's Manual
TDM-Audio 24CX-2 Owner's Manual
Summary of 24CX-2
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.
Page 2: *** Read Before Using ***
© 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...
Page 3: Table of Contents
© 2003 tdm audio, inc. Electronic crossover owner’s manual page 3 table of contents introduction .......................................................................................................................................................4 c rossover f undamentals ............................
Page 4: Introduction
© 2003 tdm audio, inc. Electronic crossover owner’s manual page 4 introduction hank you for purchasing the tdm 24cx series electronic crossover. These units are made from the finest components and engineered to exacting standards. Precision components are used in all critical circuitry for the fines...
Page 5
© 2003 tdm audio, inc. Electronic crossover owner’s manual page 5 signal source power amplifier low transducer mid transducer high transducer passive crossover figure 1 - typical passive crossover configuration this kind of crossover is called a passive crossover because it does not use any power ot...
Page 6: Crossover Terminology
© 2003 tdm audio, inc. Electronic crossover owner’s manual page 6 • external power: passive crossovers are simply inserted between the amp and the speaker components. Active crossovers must be plugged into an electrical outlet in order to work. • higher typical rolloff rates: passive crossovers typi...
Page 7: How Crossovers Work
© 2003 tdm audio, inc. Electronic crossover owner’s manual page 7 result in a greater overall efficiency of the system by making sure a band of frequencies is always reproduced by the speaker components that are most efficient at reproducing it. How crossovers work to divide a range of frequencies i...
Page 8
© 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) g ain (db ) figure 4 - 24 db per octave filter curve to make a 2-way crossover, w...
Page 9
© 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 cross 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 ...
Page 10: Mounting The Unit In A Rack
© 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. To make mounting easier, lay the rack on its back with the equipment front panels ...
Page 11: Hooking Up The Crossover
© 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. We will try to give you the ...
Page 12: The Basic Hook-Up
© 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. Some adapters leave pin 3 floating, and with tdm crossover units this will cause problems. If you have a tdm 24cx series crossover with ¼” connectors, you may conne...
Page 13: Three-Way Operation (24Cx-3)
© 2003 tdm audio, inc. Electronic crossover owner’s manual page 13 channels to link them together and form one three-way channel. This switch may be found on the rear of the unit between the channels. It is recessed into the chassis through a small, square hole, and you might need to use a small scr...
Page 14: Operating The Crossover
© 2003 tdm audio, inc. Electronic crossover owner’s manual page 14 operating the crossover nce you have mounted your tdm 24cx series crossover 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 in...
Page 15
© 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-to-mid crossover frequency channel one (or three) range switch high-to-mid range channel one (or three) high output level high output leve...
Page 16: Checking The Hookup
© 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. To avoid speaker damage, we recommend checking your hookup and settings using the following method. 1. Make sure the input level an...
Page 17: Adjusting The Output Levels
© 2003 tdm audio, inc. Electronic crossover owner’s manual page 17 adjusting the output levels start 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-normal level sig...
Page 18: Tdm Option Cards
© 2003 tdm audio, inc. Electronic crossover owner’s manual page 18 tdm option cards he tdm 24cx series crossovers have internal connectors for option cards. A variety of different option cards is available from tdm. Plugging a card into the connector inserts the circuitry on the card between a cross...
Page 19: Optional Output Limiters
© 2003 tdm audio, inc. Electronic crossover owner’s manual page 19 optional output limiters he tdm 24cx series crossovers can be ordered with output limiters. These let you set the maximum level for each crossover output. Limiters are used to help protect speaker components and ears from damage by e...
Page 20: Troubleshooting and Support
© 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 24...
Page 21: Excessive Noise
© 2003 tdm audio, inc. Electronic crossover owner’s manual page 21 is the cause of the distortion. If none of the signal 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. ...
Page 22: Contacting Tdm
© 2003 tdm audio, inc. Electronic crossover owner’s manual page 22 two different grounds. The problem is most often caused by a single piece of equipment grounded to two different power sources that are located some distance apart. For example, a mixing console is plugged into a grounded outlet at t...
Page 23: Specifications
Specifications frequency response low frequency output +0-0.5 db 10 hz high frequency output +0-1.0 db 20 khz total harmonic distortion rl > 2 kohms low frequency output high frequency output maximum output level rl > 2 kohms +21 dbu (6.2 volts) @maximum voltage gain 6 db constant-directivity correc...