Rupert Neve Designs Portico 5012
Duo Mic Pre / DI w/ Silk Switch
* denotes required field
Horizontal or Vertical Style*
Rack my RND Portico
Status: Usually Ships Same or Next Business Day
Rupert Neve Designs Portico 5012 Product Features
The Portico 5012 is a dual
channel mic pre featuring Neves custom input and output transformer designs.
In addition to individually selectable phase, mute, phantom power and a fully
sweepable high pass filter, the 5012 incorporates a Silk circuit which yields
the rich warmth and presence of the renowned classic designs.
microphone input is balanced but not floating, being a variant of an
instrumentation amplifer using a Transformer-Like-Amplifier (T.L.A.)
configuration with a toroidal Common Mode Rejection Low Pass Filter that
excludes frequencies above 150 kHz. The T.L.A. is followed by an actual input
transformer permitting a full +25 dBu input signal to be handled at unity gain
without an input pad over the whole audio spectrum. This combines the
advantages of both an Electronically Balanced and true transformer input.
When the Phantom voltage is switched off, this input serves as a very high
quality line input with an impedance of 10,000 ohms.
LOW DISTORTION OPERATION
was given in designing the 5012 to produce as little noise and non-harmonic
distortion as possible. Carefully implemented signal paths and Class A
operation are a large part of the 5012s sweet, whisper quiet performance.
discussion on transformers is out of place at this point but a technical
discussion will be posted at a later date. Here it is helpful to review some of
the essentials where it will be seen that a design needs to be viewed as a
whole, not simply from the point of view of a single component.
subtleties of circuit design relating to sonic performance are gradually
becoming more clearly understood. For example, research has shown conclusively
that frequencies above 20 kHz affect the way in which humans perceive sound
quality. But, long before scientific evidence emerged a substantial body of
musicians and engineers knew that equipment with apparently the same technical
measurements could sound very different.
small amounts of musically dissonant odd harmonics have a disastrous effect on
the sound quality. Extraneous noise or interference that finds its way into a
signal path seriously impairs performance of the whole chain.
control rooms make use of outboard gear that is not well protected from
external signals. Poor grounding of such equipment can be a serious problem.
Electronically balanced circuits much used in modern equipment, can give very
good measurements on the test bench but they do not provide adequate rejection
of the stray fields found in every working environment.
output circuits must be freed from ground dependence so that only the wanted
signal enters and leaves the processing path. Transformers are the ideal
solution. The sweet and silky sound of my classic old favorite consoles was
achieved with big transistors and large high quality transformers. Rupert Neve
Designs Portico modules achieve similar quality today without the bulk or the
that modules can work together as would be expected (i.e. in a proprietary
console configuration) without producing hum, R.F. interference, or other
interactions, the connecting interfaces, grounding, levels and impedances must
receive careful attention. Each Portico module is a complete integral signal
processor that delivers its specified performance independently. This is one of
the reasons we use transformers.
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
-30 dBu to
+22 dBu With reference to the output
Cuts of the
output signal post metering and pre Buss Output. Be sure to mute the outputs
before engaging phantom power.
High Pass Filter
pass filter is a valuable aid in any signal chain but particularly so in a
microphone preamplifier. Signals between 20 and 250 Hz can be attenuated,
leaving the range above this unaffected. This gets rid of building rumble, air
handling motor hum etc.
48V phantom power to microphones
The To Buss
output is unbalanced and has a high impedance output. It is intended for use
with the Portico Buss Amp/Monitoring modules. A TRS patch cord is used to
connect the 5012 Buss output to one of these bussing modules. The Monitor
connection is derived pre mute on the 5012 and will produce a signal at the
output of the buss modules that is equal in level to that at the 5012 output.
The Monitor output cannot be used for any other purpose.
Flips the phase
of an incoming source 180 degrees
Rupert Neve Designs Portico 5012 Tech Specifications
- Input: Balanced, using
Transformer-Like-Amplifier (T.L.A.) with toroidal Common Mode Rejection Low
Pass Filter that excludes frequencies above 150 kHz.
- The T.L.A.
is followed by an actual input transformer permitting a full +26 dBu input
signal to be handled at unity gain without an input pad over the whole audio
the advantages of both an Electronically Balanced and true Transformer input.
- When the
Phantom voltage is disabled, this input serves as a very high quality Line
- Input Impedance: 10,000 Ohms + or 20%
- Measured at
Main Output: Input terminated with 150 Ohms.
over band limited 22Hz-22kHz, Unweighted: With Gain at Unity: Better than 100
dBu. With Gain at 66 dB: Better than 62 dBu Equivalent Input Noise (E.I.N.)
Better than 128 dBu
- Frequency Response:
Output, no load: @ 10 Hz, 0.2 dB @ 160 kHz 3 dB
- Buss Output @ 10 Hz 0.2 dB @ 160 kHz 3 dB
Swept Frequency continuously variable from 20 Hz to 250 Hz.
- Slope: 12
- Gain: Switched Gain from Unity to +66dB
in 6 dB steps.
- Trim: Continuously adjustable
potentiometer from 6dB to +6dB with reference to setting on the Gain Switch.
- Maximum Output Level: Balanced and Floating Transformer
Output from 20 Hz to 40 kHz: +25 dBu. (Clips at just over +26 dBu)
- Mute: Mutes
Main Output only. (i.e. Monitor remains
- Total Harmonic Distortion and
Output: @ 1kHz, +20 dBu output level, no load: Better than 0.001%. (No high
Engaged: Approximately 0.2% Second Harmonic
- Main Output:
@ 20Hz, +20 dBu output level, no load: Better than 0.01%.
Output: @ 1kHz, +20 dBu output level, no load, measured at the output: Better
- SILK: The 5012 uses mainly single-sided
amplifier circuitry that excludes any possibility of crossover distortion. The SILK button
reduces negative feedback and adjusts the frequency spectrum to provide a very
sweet and musical performance.
- Buss Output:
- The Buss
Output is designed to feed other Portico Series modules with Buss Inputs.
- Crosstalk: Measured Channel to Channel: Better
than 90 dB @ 15kHz. Phantom Power: +48 Volts DC +/ 1%
- Main Power Required: (From External Power Unit)
Range, 9 to 18 Volts DC.
- Current consumption: @ 9VDC = 1.3 A typical; @12VDC = 1A
typical; @15VDC= 800 mA typical; @18VDC= 650 mA typical
- Rear Panel Power Connector: 5.5mm X 2.1mm DC jack, Center
Rupert Neve Designs
5012 Review / See
All ZenPro Audio Reviews Here: Review Page
This half rack sized (rack kits
available) stereo preamp is sort of unassuming and somewhat utilitarian in
look, but delivers a classic transformer preamp sound as well as a subtle “silk”
switch that adds, well, some silky sound to your source. With things like
metering, phase, a MUTE switch and variable hi-pass filter (up to 250hZ, very
useful) the 5012 certainly steps up and delivers in the realm of stand alone
preamps. It can also be used as a small mixer with other RND devices via the
onboard BUSS if you like.
This preamp is smooth overall, and
delivers air very nicely as well as depth. It can actually stay quite clean in
the lower gain ranges, but has a subtle drive when pushed (not a real crazy
distorted sound, it’s hard to take the 5012 into full on distortion really). The
ability to gain stage between the output and input is nice, just don’t expect
super crunch but rather a mild push that is handled well without just clipping
on you. Midrange has a particularly “forgiving” sort of sound with this unit,
it smooths out spiky stuff nicely. The open space and air up top is very much
appreciated by me, this is not a dark preamp at all. The “silk” function is
subtle, but can really bring some smoooooth presence to an intimate vocal,
acoustic sources and more.
Conclusion: Very nice offering in
this price range, and maybe overlooked at times due to its half rack size. An
excellent choice when you want that full transformer sound but tend to like
clarity and air delivered as well. The silk button and variable hi-pass put it
into its own category.