J PRE 500 ® ® JENSEN TRANSFORMER COUPLED MIC PRE 500 SERIES MODULE Owner’s Manual
SAFETY DECLARATIONS CAUTION: For continued protection against risk of fire, replace only with the same type and rating of fuse. ATTENTION: pour une protection continue contre les risques d’incendie, ne remplacer qu’avec la même valeur et même type de fusible. WARNING: Do not place objects containing liquid on this unit as it is not designed to protect against spillage. Do not expose this unit to dripping or splashing of liquids as the unit is not designed to protect against these occurances.
TABLE OF CONTENTS INSTALLING THE J PRE 500 IN A 500 SERIES RACK 1.0 INSTALLATION 5 2.0 INTRODUCTION 6 3.0 CONTROLS AND INDICATORS 3.1 Trim Control 3.2 Input Meter 3.3 Output Level Switch 3.4 -26dB Pad 3.5 Phase 3.6 75Hz High Pass Filter 3.7 48V Phantom Power 3.8 Mic Lim 3.9 Instrument Input 4.0 WARRANTY AND SERVICE 4.1 Limited Warranty 4.2 Service Information 5.0 PATENT NOTICE Page 4 6 6 6 7 7 7 7 8 8 9 10 11 1.
2.0 INTRODUCTION The J PRE 500 mic pre is inspired by the Aphex flagship 1788A preamp. They both use the same Jensen JT11K8 nickel input Transformer. Both preamps also feature the Aphex patented Mic Lim limiter which limits before the preamp. Unlike the 1788A, the J PRE 500 also features a Jensen JT-11DL nickel output transformer for output balancing. This provides the cleanest possible balanced output signal. 3.0 CONTROLS & INDICATORS 3.
3.8 MIC LIM Pressing this button will engage the Aphex patented MIC LIM limiter. It limits before the preamp. This way a large transient signal will be limited before it is amplified. This protects the mic pre and provides a cleaner signal than standard limiters. When the Mic Lim is limiting, the Mic Lim button will flash red. 3.9 INSTRUMENT INPUT The J PRE 500 provides a 1/4”, 10 MOhm instrument input. When an instrument is plugged in to this input it will override the XLR input on the receiving frame.
4.2 SERVICE INFORMATION If it becomes necessary to return this unit for repair, you must first contact Aphex for a Return Authorization (RMA number), which will need to be included with your shipment for proper identification. If available, repack this unit in its original carton and packing material. Otherwise, pack the equipment in a strong carton containing at least 2 inches of padding on all sides. Be sure the unit cannot shift around inside the carton.
