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Amplifi er Direct Box
User Guide
CAUTION: Please read safety disclosure
statement on the inside cover before
connecting your Radial JDX.
Radial Engineering Ltd.
1588 Kebet Way, Port Coquitlam BC V3C 5M5
Tel: 604-942-1001 Fax: 604-942-1010
email: info@radialeng.com
®
True to the Music
JDX
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Summary of Contents for Radial Engineering JDX
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Page 1: User Guide
True to the Music Amplifi er Direct Box User Guide CAUTION: Please read safety disclosure statement on the inside cover before connecting your Radial JDX. Radial Engineering Ltd. 1588 Kebet Way, Port Coquitlam BC V3C 5M5 Tel: 604-942-1001 Fax: 604-942-1010 email: info@radialeng.com... - Page 2 THE JDX IS NOT A LOAD BOX It is mandatory that your amplifi er be connected to a loudspeaker or load box at all times. The JDX does not provide a signifi cant resistive load for an amplifi er to safely operate.
- Page 3 Congratulations on your purchase of the Radial JDX guitar amp direct box, a unique tool for recording and performing with ampli- fi ed electric guitar. The JDX is an active speaker-level DI that taps the natural tone of your amplifi er and interfaces it with professional recording and PA systems.
- Page 4 True to the Music DESIGN CONCEPT The JDX differs from a standard DI like the Radial J48. A stan- dard DI taps the output of the guitar before it is connected to an amplifi er. The JDX taps the output of your amplifi er yielding a completely different sound.
- Page 5 TYPICAL APPLICATIONS Replace a Microphone with JDX. The most basic use of the JDX is to eliminate the need to use an open microphone to capture the sound from the guitarist’s amp. The diagram shows the typical connection of the JDX.
- Page 6 True to the Music BLOCK DIAGRAM To help you understand how the JDX works take a few moments to trace the signal fl ow through the block diagram. BALANCED XLR OUTPUT TRANSFORMER REACTIVE LOAD ACTIVE ACTIVE POLARITY BANDPASS BALANCED REVERSE...
- Page 7 fi lter circuits. Active Balanced Driver The output driver in the JDX converts the output to a balanced 600 ohm mic-level signal for driving long cables without signal loss or noise. This JDX output can be patched into typical microphone snakes and be processed along with other microphone signals.
- Page 8 300 watts. POWER LED lights to indi- TO SPEAKER connects your amp cate the JDX is connected to the speaker through the JDX. to its power supply. Connection to a loudspeaker is mandatory. Please read the safety disclosure statement before con- necting the JDX.
- Page 9 True to the Music CONNECTING THE JDX The JDX will typically be located on or near the guitar amplifi er to facilitate short speaker cables. We recommend speaker cables be 6 feet or less in length with a minimum of 16AWG two conductor cable.
- Page 10 Q: Does the JDX provide a load for the amp to drive. A: No. The JDX is not a load box. For safe operation a loudspeaker must be connected to the SPEAKER OUT jack. Q: Can I use the JDX with a load box or power attenuator? A: Yes.
- Page 11 True to the Music JDX Specifi cations Circuit type: Class-A 100% discreet Speaker emulation Reactive load sensing with proprietary band pass fi ltering Total harmonic distortion 0.005 % @ 1KHz Amp input 1/4", 300 watts max Speaker thru-put 1/4", paralleled to amp input Balanced outputs XLR 600, -60dB mic-level...
- Page 12 1588 Kebet Way, Port Coquitlam BC V3C 5M5 Tel: 604-942-1001 Fax: 604-942-1010 email: info@radialeng.com Radial JDX user guide - Part #: R870 1200 00 - Rev1.1 - Oct. 2009 Apperances and specifi cations subject to change without notice. Copyright © 2009 Radial Engineering Ltd. all rights reserved.