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Rupert Neve Designs 517 DI - Mic Pre - Compressor with Variphase - 500 Series

 
  • Dale #:

    RND-517
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Description

Based on the Portico 5017 Mobile Pre, the 517 provides world class, transformer-coupled preamp, compressor and DI circuitry, with Vari-phase, Silk and DI/mic blending capabilities in a 500 series model. As the first 500 series module designed by Mr. Rupert Neve, the 517 incorporates outstanding s... Read More

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Description

Based on the Portico 5017 Mobile Pre, the 517 provides world class, transformer-coupled preamp, compressor and DI circuitry, with Vari-phase, Silk and DI/mic blending capabilities in a 500 series model. As the first 500 series module designed by Mr. Rupert Neve, the 517 incorporates outstanding sonic quality with an indispensable feature set.

Features:

  • Silk - Much could be written about this feature, suffice to say, that it gives a subtle option to enhance sound quality in the direction of vintage modules. The silk button reduces negative feedback and adjusts the frequency spectrum to provide a very sweet and musical performance. We suggest you try it and make your own judgment.

  • Mic Gain - Mic gain is from 0dB to 66dB. Overall gain to restore the apparent program level

  • DI Gain - DI Gain is from 0dB to 30dB

  • DI input - Balanced or unbalanced Hi-Z input for instruments

  • Phantom power - Provides 48v phantom power to microphones. Controlled by the 48V switch.

  • Polarity reverse - Reverses the polarity of the mic input

  • Threshold - When signals exceed the threshold level, the gain is reduced at a controlled 2:1 ratio, with fixed attack and release time constants.

  • Indicators - Indicators on the 517 denote signal presence and clipping on both DI and mic signals, as well as compressor activation.

Mic Pre and Instrument Amplifier

The 517's mic pre includes 66dB gain, and is based on the Portico 5017 design. The mic pre also incorporates a polarity reverse switch and phantom power. The separate instrument amplifier includes 30dB of gain, a ground lift, variable phase and an instrument Thru connection.

Blended Use

Used as a single channel device for instruments, the 517 can be used to phase align, combine and compress direct and amplified signals. To achieve this, use the DI for the instrument's direct signal and the mic preamp for the speaker cabinet signal. The blend control is used for mixing direct and amplified signals to achieve the desired tonal blend between the two sources, and the variphase is used to minimize or extenuate phase cancellations between the two signals. To compress the blended signal, the internal compressor jumper must be set to the blend path (this is the default setting). This technique could also be used to create a single, mixed output of a guitar and vocals.

The Compressor

Based around a new LDR (light dependent resister) design, the 517's opto-coupler compressor has been simplified to a single threshold control with auto make up gain. By default, the compressor is set to a fixed 2:1 ratio with fixed attack and release. To set the compressor, simply dial the threshold control down until the desired amount of compression is achieved. An LED light indicates when the compressor is active.

Vari-Phase

In addition to the standard polarity reverse, the 517's vari-phase control may be used to adjust phase incrementally. This control is useful any time two signals derived from the same source are combined.

For instance, even with careful placement, the combination of close miced drums and overheads, can often yield hollow sounding results. By using the variable phase adjust, the direct signal can be phase rotated until the signals are naturally aligned.

This technique is also extremely useful when combined with the internal blend control on instruments. A bassist, using both direct and miced signals can blend the two into a single output, using the vari-phase to reach an optimal alignment. By adjusting the phase in the 517, the musician or engineer can find the absolute best mic position without regard to the phase relation to the direct signal.

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Product Specs

Frequency Response
Mic Pre
Main Output, no load,
-0.1dB @ 10Hz, -1 dB @ 120kHz
DI Input
Main Output, no load,
-0.1dB @ 10Hz, -1 dB @ 120kHz
Noise
Measured at Main Output, unweighted, 22Hz-22kHz, Terminated 150 Ohms. 10With gain at unity better than -100 dBu
With gain at 66 dB better than -60.5 dBu
Equivalent Input Noise better than -125 dBu
DIWith Gain @ Unity Typically better than -100dBu
With Gain @ +30 dB Typically better than -75dBu
High Pass Filter
Frequency80Hz
Slope12 dB/Octave Bessel
Microphone Input Impedance 10,000 Ohms
Instrument Input Impedance1.6 Meg ohms (3.3 Meg Ohms balanced)
Maximum Output LevelMaximum output from 20 Hz to 40 kHz is +23 dBu.
Gain
Mic PreUnity to +66dB in 6dB steps
DI:Unity to +30dB continuous.
Total Harmonic Distortion and Noise
@ 1kHz, +20 dBu outputMain Output: Better than 0.001%
@ 20Hz, +20 dBu outputMain Output: Better than 0.002%
Silk EngagedBetter than 0.2% Second harmonic
Variphase@100Hz: 2.9 degrees to 57.4 degrees.
@1kHz: 33.5 degrees to 156 degrees.
@10kHz: 149 degrees to -175 degrees.
CrosstalkMeasured channel to channel: Better than -90 dB @ 15kHz.
Phantom Power+48 Volts DC +/- 1% (provided by 500 Series Rack)
Power requirementsSupplied by 500 series rack with 110-125 mA @ +/- 16V
Compressor
ThresholdContinuously Variable from -20dBu to +10dBu
RatioFixed at 2:111
Attack & ReleaseFast Mode Attack 40ms , Release 40ms
Slow Mode Attack 100ms , Release 350ms
Total Harmonic Distortion
Measured @ Main Output. Mic Pre and DI
@ 1kHz, +20dBu output: Better than 0.002%
@ 20Hz-20kHz, +4dBu output: Better than 0.02%
Silk@ 20Hz, +4dBu output Better than 0.5%
@ 50Hz, +4dBu output Better than 0.1%

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