Intellijel mJack Manual 

modular-level voltages to line-level outputs suitable for driving amplifiers, recording devices, or DAW interfaces. Headphone monitoring is also supported via a low noise built-in headphone amp capable of driving high impedance studio headphones. Features ● Headphone amp capable of driving high impedance headphones via 1/4″ stereo Neutrik jack. ● L and R +4dBv unbalanced line level outputs on TRS 1/4″ Neutrik jacks. ● Switch for mono/stereo monitoring. ● Left input normalled to Right input. ● Individual level attenuators and global stereo headphone gain control. ● 6-pin header on back of module and ribbon cable for connecting directly to the outputs of an Intellijel Dubmix or Azimuth II. Page 1

Overview Features Table of Contents Installation Before Your Start Installing Your Module Front Panel Controls Inputs & Outputs Technical Specifications Page 2

supply. Before Your Start Before installing a new module in your case you must ensure your case’s power supply has sufficient available capacity to power the module: ● Sum up the specified +12V current draw for all modules, including the new one. Do the same for the -12 V and +5V current draw. The current draw will be specified in the manufacturer's technical specifications for each module. ● Compare each of the sums to specifications for your case’s power supply. ● Only proceed with installation if none of the values exceeds the power supply’s specifications. Otherwise you must remove modules to free up capacity or upgrade your power supply. You will also need to ensure you have enough free space (hp) as well as free power headers in your case to fit the new module. You can use a tool like ModularGrid to assist in your planning. Failure to adequately power your modules may result in damage to your modules or power supply. If you are unsure, please contact us before proceeding. Page 3

When installing or removing a module from your case always turn off the power to the case and disconnect the power cable. Failure to do so may result in serious injury or equipment damage. Ensure the 10-pin connector on the power cable is connected correctly to the module before proceeding. The red stripe on the cable must line up with the -12V pins on the module’s power connector. The pins are indicated with the label -12V, a white stripe next to the connector, the words “red stripe”, or some combination of those indicators. Most modules will come with the cable already connected but it’s a good idea to double check the orientation before proceeding. Be aware that some modules may have headers that serve other purposes so ensure the cable is connected to the right one. The other end of the cable, with a 16-pin connector, connects to the power bus board of your Eurorack case. Ensure the red stripe on the cable lines up with the -12V pins on the bus board. On Intellijel power supplies the pins are labelled with the words “-12V” and a thick white stripe. If you are using another manufacturer’s power supply, check their documentation for instructions. Page 4

shown below. Before reconnecting power and turning on your modular system, double check that the ribbon cable is fully seated on both ends and that all the pins are correctly aligned. If the pins are misaligned in any direction or the ribbon is backwards you can cause damage to your module, power supply, or other modules. After you have confirmed all the connections, you can reconnect the power cable and turn on your modular system. You should immediately check that all your modules have powered on and are functioning correctly. If you notice any anomalies, turn your system off right away and check your cabling again for mistakes. Page 5

headphone output. 2. MONO/STEREO Switch This switch controls whether or not the output of the module is mono or stereo. In mono mode (switch is to the left), the LEFT and RIGHT inputs are summed internally. In this case both the L and R outputs, as well as both channels of the headphone jack, output the same signal. 3. LEFT Attenuator This knob attenuates the level of the LEFT input. The signal is unmodified when the knob is fully clockwise, otherwise the level is reduced proportionally. 4. RIGHT Attenuator This knob functions just as the LEFT Attenuator but for the RIGHT audio channel. Inputs & Outputs A. LEFT Input Any eurorack-level audio sent to this jack will be scaled down to +4 dBu levels and sent out the L Out jack. Use the LEFT Attenuator to further reduce the signal level. B. RIGHT Input Any eurorack-level audio sent to this jack will be scaled down to +4 dBu levels and sent out the R Out jack. Use the RIGHT Attenuator to further reduce the signal level. NOTE: The LEFT Input jack is normalled to the RIGHT Input jack, so if nothing is connected to the RIGHT Input jack, then one signal fed into the LEFT Input jack will feed both of the ¼” output jacks. Page 6

This jack carries the attenuated output of the modular-level signal sent into the LEFT Input jack. It enables you to interface your modular gear with external mixers, power amps or DAWs, and is an unbalanced +4 dBu ¼” output. For use with -10dBv systems, simply dial back on the corresponding channel’s attenuator. D. R Out This jack carries the attenuated output of the modular-level signal appearing at the RIGHT Input jack. Like the L Out jack, it enables you to interface your modular gear with external mixers, power amps or DAWs, and is also an unbalanced +4dBu ¼” output, which you can attenuate down to -10dbV levels. E. HEADPHONE Output This is a stereo ¼” output intended primarily for headphones. Its volume level is set with the HEADPHONE Level knob, and you can monitor the Left and Right signals in either stereo or mono, depending on the position of the MONO/STEREO switch. Technical Specifications Width 6 hp Maximum Depth 26 mm Current Draw 17 mA @ +12V 17 mA @ -12V Page 7