R6 Six Space 500 Series Rack

With abundant power and versatile connections, the R6 delivers peace of mind for engineers who demand a higher degree of confidence in their 500 series racks.

Power You Can Trust

Power-wise, the R6 has more than 150% the required current for a 6-space chassis to prevent the power rails from failing under a higher-than-expected load. To help monitor and troubleshoot problematic modules, the R6 is equipped with LED current metering to show how much power is being used. The internal power supply itself has been carefully designed and double-shielded to avoid significant magnetic induction in any of the channel positions. With such attention to providing and monitoring power, the R6 helps your modules realize their fullest potential.

Connect Like Never Before

With a plethora of connections available, the R6 backpanel is practically a patchbay on its own. The R6 features 8 channels of balanced I/O options including DB-25, XLR and TRS that may be used interchangeably. This versatility is especially handy when you are taking the R6 with you to another environment where you are unsure of the cables available, or if you need to convert DB-25, XLR or TRS connections to another format using the THRU functionality on channels 7-8.

Solid Steel Construction

The chassis is comprised of solid steel with bumpers to support the unit in both horizontal and vertical configurations, and features a collapsable handle for portability. All connectors and fittings are of the highest quality to ensure that the R6 will hold up to many years of use.

A New Level of Confidence in the 500 Series

Because the R6 is built to 500 series specifications, it will work flawlessly with any properly-designed 500 series module you wish to include in it. To help accommodate modules that are slightly out of spec, the R6 has variable-position screw holes to help make the installation process as smooth as possible. The 500 series VCA buss link function can be enabled in pairs on the R6 using the link jumpers on Channels 1-2, 3-4, or 5-6. Enabling link allows compatible compressor modules like the 543 to share VCA control when their links are enabled. Matching blank panels are also available to cover any empty slots.

If you want to get the very best performance out of your 500 series modules, the Rupert Neve Designs R6 is the serious rack for the serious sound you want.

Features

• Massive Connectivity
• Interchangeable XLR, TRS, and DB-25 I/O connections are provided to ensure that you can connect wherever you go with the backpanel patchbay
• Serious Power
• Even with modules that overdraw the 500 series specification, the R6 has the reserve power to maintain the voltage
• Power Monitoring
• An LED Meter monitors the R6 current usage to ensure that you never run short on power. This meter can also be useful for troubleshooting a module that is severely overdrawing its allotment
• Channel 7-8 Thru Conversion
• The channel 7-8 thru connections can be used as a way to quickly and easily convert your signal from/to DB-25, XLR, and TRS connectors
• 48V Phantom Supply
• Provide rock-solid phantom power to your microphones with the R6’s robust 48V buss
• "Built For The Road" Frame
• A solid steel enclosure, two sets of rugged rubber feet for horizontal and vertical mounting and a collapsible handle make the R6 completely portable and ready for the road

Portico 542 Tape Emulator

The ultimate “color box”. As a 500-series follow-up to the Portico 5042, the 542 delivers the same thick, musical simulation of tape while drastically enhancing creative control via a number of new features. In addition to the the “true tape” circuitry – great for bringing out 3rd-order harmonics – the 542 incorporates a soft-clip circuit that tames the harshest sources and enhances 2nd-order harmonics, a variable and versatile Silk/Texture circuit for three transformer tones in one, and a wet/dry control to blend in the perfect amount of saturation.

The Portico 542’s “True Tape” emulation circuit provides the nostalgic rounding and compression usually only achieved by the use of tape, and can offset the harshness often found in digital recordings. Unlike digital emulations, the “True Tape” drive circuit works by feeding a tiny magnetic “record head”, whichin turn is coupled to a correctly equalized, replay amplifier. As the voltage rises on the “record head”, saturation increases, and a soft clip circuit engages at higher levels to round off peak transients. The sound of the tape circuit can be further modified with selectable 15 / 30 IPS modes and a pre/post-tape blend control. In addition to the tape circuit, the 542 also has the variable Silk & Texture circuitry found in the Portico II series of modules, which allows the engineer to fine-tune the harmonic ratio and tonality on the output transformer.

Getting the Most Out of the 542

While in the olden days, tape’s non-linearity was generally looked upon as more of a curse than a “feature”, the advent of digital systems that operate in a completely linear fashion has made many appreciate the quirks of non-linear audio processing. Unlike linear designs, non-linear devices require the user to actively experiment with gain staging to find the “sweet spot” of the circuit. Although this requires a small amount of effort on part of the engineer, if used properly, the effect can add a dynamic aspect to performances that can enhance the impact of a song.

The non-linearity in the 542’s “True Tape” circuitry and Saturation control necessitate taking note of both drive and input levels. How levels are staged into the 542’s tape circuit can significantly impact tone, depending on the position of the saturation control and the drive level on the tape circuit. As saturation is increased, low frequency compensation is decreased, and at a drive level of 5 the soft clipper enters the circuit. Finding the best balance point between low frequency response, total harmonic distortion, and desired soft clipping require playing with a combination of the saturation, trim and blend controls, and may also include using dynamics processing and proper gain staging before the 542.

As a rough guide, we recommend starting with an input signal from around 2-10dBu and applying saturation, 15 / 30 IPS, Silk, and blend to taste. However, it always behooves the engineer to experiment with the balance between the pre-tape signal level and the level of the saturation control to find the best results for each source.

To get a better idea of what is happening at different saturation and “Tape Head” levels, look through the frequency response and THD by frequency response graphs in the Technical Specifications section at the end of the manual.

Also, like a real tape machine, the flux loops in the “True Tape” circuitry can pick up signals from strong nearby magnetic fields (The most likely sources are nearby power supplies, power amplifiers and computer monitors). Although we have shielded both the unit as a whole and the tape circuit to minimize stray inductance, if you have issues with hum when engaging the tape circuit, try moving the 542 to other spots away from magnetic field radiators until the hum subsides.

Adding Texture

Both Silk modes are modified and fine tuned by the “Texture” control. By manipulating the Texture control, the amount of Silk can be changed from essentially absent, to roughly four times the amount of coloration found in Silk from the original Portico Series. With Silk / Texture engaged, the distortion characteristic and harmonic content of the unit are very reminiscent of many of Rupert’s vintage class-A designs. These controls add another realm of tonal control to the 542, and should be explored creatively in conjunction with the “True Tape” for best effect.

Designed for 500 Series by Mr. Rupert Neve

Rupert Neve: “While creating functional 500-series modules is relatively simple, designing those modules to equal their non-500 series counterparts with the current, voltage and space restraints is quite challenging. In creating our Portico 500 Series Modules, we experimented with a number of different transformer and circuit designs to achieve the same presence and sweetness found in the Portico Series of modules. The result of these efforts is that outside of the slightly lowered headroom, our 500 series modules are nearly indistinguishable from standard Portico Series modules, and are perfectly suited for studios of the highest-caliber.”

The Portico 542 consists of a line driving amplifier having transformer balanced inputs and outputs. The sonic quality of these amplifiers is such that by providing galvanic isolation, simple single-sided circuit topology and freedom from grounding problems, they are capable of enhancing the sonic quality of many signal sources, especially those of digital origin. The sonic “signature” is one of extreme purity and the image is consistent with that of Rupert Neve’s original designs of 35-40 years ago.

TAPE In

Sends the signal through the “True Tape” circuitry, which is affected by the saturation, blend and 15 / 30 IPS controls.

TRIM

Provides +/– 12dB adjustment of level on incoming signal levels, prior to the tape circuit.

SATURATION

Controls the signal level being sent to the magnetic Tape Head. As the saturation level increases the level on the “record” head rises, and the replay gain is reduced so that the overall output signal level remains more or less constant. In a real tape recorder, you would adjust the record and replay gain controls separately, however in the 542 the record and replay gain controls are coupled so that the overall signal level only varies as the “Tape” saturation level changes. As you approach maximum saturation setting, the output signal level will drop due to the effect of extreme saturation and soft clip.

Additionally, to compensate for low frequency loss at low “record head” levels, the saturation knob also controls a low frequency compensation circuit that boosts low frequencies more at low saturation levels, and tapers off at higher levels. This function can be useful on many sources like bass and kick drum to find the balance between a clean, boosted low end (low saturation) and a denser, more saturated low end (high-saturation).

15/30 IPS

Selects the pre-emphasis / de-emphasis, record / replay tape characteristic. The 15IPS mode has a significant “head bump” in the low frequencies centered around 60Hz, as well as a more pronounced roll of in the high frequencies. The 30 IPS mode is generally a flatter response through the high-end with a “head bump” around 120Hz. See the frequency plots on pages 10 & 11.

BLEND

Controls the mix of pre and post tape signals. This allows the engineer to dial in a subtle amount of the tape effect, to better control the amount of saturation, tone and soft clipping in the post blend signal. As the signal gets more saturated, dialing back the blend can be a great way to impart the feel of tape, while maintaining a similar level of detail and transparency. NOTE: The blend control does not effect the Silk and Texture controls.

SOFT CLIP

A soft clip engages in the “True Tape” circuitry when the drive meter hits 5 (first yellow LED), and becomes more apparent at higher levels. The soft clip can be used as a way to tame overly transient material like drums, and can be controlled further by using the blend control.

SILK / TEXTURE

Pushing the Silk button engages the Silk Red circuit, and pushing it a second time introduces Silk Blue circuitry. Silk reduces the negative feedback on the output transformer, adding harmonic content as the texture is increased. Silk Blue mode features more saturation in the lows and low mids, whereas Silk Red accentuates the saturation in the high-mids and highs.

LEVEL / DRIVE METERS

Two eight segment LED bar-graph meters are fitted to the 542 for output level and drive metering. The level meter shows the output level of the 542 before the Silk circuit, and the drive meter reflects the level on the “record head” when the tape effect is engaged. The soft clip circuit is present at Drive levels above 5.