Portico 5017 By: Mobile DI / Pre / Compressor Serial #: Operations Manual 1
Portico 5017: Mobile DI / Pre / Compressor User Guide Thank you for your purchase of the 5017 Mobile DI / Pre / Compressor. Everyone at Rupert Neve Designs hope you enjoy using this tool as much as we have enjoyed designing and building it. Please take note of the following list of safety concerns and power requirements before the use of this or any Portico Series product. Safety It’s usual to provide a list of “do’s and don’ts” under this heading but mostly these amount to common sense issues.
Portico 5017: Front Panel MICROPHONE PREAMPLIFIER DESIGN NOTES Vari-phase High Pass Filter Continuously rotates the phase of the instrument signal Reduces signals by 12dB/octave Threshold When signals exceed the “threshold” level, the gain is reduced at a 2:1 ratio, with a constant attack and release times.
In the early 1960’s when the “Pop” music scene was exploding and sound levels in the Studio became very high, there was concern that the head amplifiers in Condenser microphones would overload if the Console input impedance was too low. In the early days of Consoles I was asked to provide higher input impedance than the normal 1,000 ohms. This of course, resulted in less “step-up” in the Console input transformer and there were then fears that we would lose out at the other end of the scale; Noise.
Dual Channel Use - Vocal and Instrument Used as a two channel device, a lead singer / guitar player, can take the classic studio quality of the 5017 wherever they go. In this scenario, the vocal would use the mic input, the compressor and mic output, while the guitar would use the instrument input and blend output. To achieve this, the blend control should be selected as fully DI, and an internal jumper needs to be set to the mic path.
5017 FEATURES MICROPHONE INPUT The microphone input is balanced but not floating, being a variant of an instrumentation amplifier. Our well-proven “Transformer-Like-Amplifier” (T.L.A.) configuration is used, which includes an accurate toroidal Common Mode Low Pass Filter that rejects Common Mode signals and excludes frequencies above 150 kHz.
5017 RECALL SHEET SPECIFICATIONS Frequency Response: Main Output, no load, –0.2 dB @ 10 Hz –3 dB @ 160 kHz Mobile Pre/DI/Comp INST COMP VARI PHASE MIN MAX -20 MIC +10 THRESHOLD PHASE SWEEP THRU COMP Noise: Measured at Main Output, unweighted, 22Hz-22kHz, Terminated 150 Ohms. With gain at unity better than –100 dBu With gain at 66 dB better than –62 dBu Equivalent Input Noise better than –128 dBu Noise Factor 1.
PRODUCT WARRANTY Rupert Neve Designs warrants this product to be free from defects in materials and workmanship for a period of one (1) year from date of purchase, and agrees to remedy any defect identified within such one year period by, at our option, repairing or replacing the product.
