Mobile Mic Pre / DI / Comp


    Comprised of a rugged, portable chassis with world class Portico pre-amp, compressor and DI circuits as well as two channel operation, variphase, silk and DI/mic blending capabilities, the Portico 5017 is an innovative and powerful tool for recording or live performance. In replacing the Portico 5016 Mic Pre / Variphase DI, the 5017 Mobile DPC adds single knob compression, DI / Mic Pre blending, and a go anywhere design to a well established classic.

    With Portico Series custom transformers and silk mode, the Mobile DPC’s sonic signature is nothing short of legendary. It’s the 5017’s revolutionary feature set however that make it an indispensable tool for studio recording, live recording and stage performances.

    Dual Channel Use

    Used as a two channel device, a lead singer and guitar player, can take the classic studio quality of the 5017 wherever they go; using the DPC for a Vocal mic pre and compressor, as well as a separate DI preamplifier. To achieve this, the blend control should be selected as fully DI (blend off), and an internal jumper can be selected to apply the compressor to the mic pre signal. When engaged, Silk mode would effect both vocal and guitar tracks, and the HPF control would effect only the mic path.

    Blended Use

    Used as a single channel device for instruments, the 5017 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 5017’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 an internal jumper to change between standard and fast time constants. 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.


    In addition to the standard polarity reverse, the 5017 also incorporates a vari-phase control to adjust the 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 5017, the musician or engineer can find the absolute best mic position without regard to the phase relation to the direct signal.

    With the 5017, the Portico sound is always within reach.


    Two Channel Operation

    With two transformer coupled outputs, the 5017 has separate line outputs for the DI/Blend and Mic signals when the blend control is set to fully DI. The mic output is always independent.


    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

    High pass filter

    The high pass filter is a valuable aid in any signal chain but particularly so in a microphone preamplifier. Signals below 80hz can be attenuated at a rate of 12db / octave, getting rid of building rumble, air handling motor hum etc.

    Phantom power

    Provides 48v phantom power to microphones. Controlled by a switch on the back of the unit.

    Phase invert

    Reverses the polarity of the mic input


    When signals exceed the “threshold” level, the gain is reduced at a controlled 2:1 ratio, with attack and release time constants set to standard or fast depending on the internal jumper setting.


    Indicators on the 5017 denote signal presence and clipping on both DI and mic signals, as well as compressor activation.

    Internal jumpers

    Two internal jumpers in the 5017 can be set to change the compressor from the mic channel to the di / blend channel, and to change the compressor time constant from standard to fast.


    “The Portico 5017 was a Swiss army knife of audio solutions, making both acoustic and electric guitars sound better. The Compressor and Silk controls were icing on the cake; the Blend feature is perfect for guitarists who know the magic of microphones. A back-mounted button for 48-volt phantom power (for use with condenser mics) is more evidence of the 5017’s handiness.”

    “The Portico 5017 is the most versatile and portable piece of gear I have, not to mention it sounds amazing in addition to the practicality. Even better is it doesn’t hurt the wallet.”

    “”This thing sounds really good! It saved my ass a bunch of times on a recent European tour.” ”

    “For novices seeking their first quality piece, I recommend this little, humble utilitarian over a rack full of brittle mic pres and mushy compressors…. For high-fidelity loving, traveling musician/self-recordists, the 5017 is a must have.”

    “Sounds great….having the convenience of the Blend, Silk, compression, and phase adjustment all in one neatly integrated box can be a huge problem solver.”

    Tech Specs


    7.5″ (deep) x 6.5″ (wide) x 2″ (high)

    Frequency Response:

    Main Output, no load,
    –0.2 dB @ 10 Hz
    –3 dB @ 160 kHz


    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 1.5dB

    Maximum Output Level:

    Maximum output from 20 Hz to 40 kHz is +23 dBu.

    Total Harmonic Distortion and Noise:

    @ 1kHz, +20 dBu output: Main Output: Better than 0.001%
    @ 20Hz, +20 dBu output: Main Output: Better than 0.002%
    Silk Engaged: Better than 0.2% Second harmonic


    Measured channel to channel: Better than –90 dB @ 15kHz.

    Phantom Power:

    +48 Volts DC +/- 1%