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The Portico 5012 is a dual channel mic pre featuring Rupert NeveÃ¢â‚¬â„¢s 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 Ã¢â‚¬Å“SilkÃ¢â‚¬Â circuit which yields the rich warmth and presence of his renowned classics.
The microphone input is balanced but not floating, being a variant of an instrumentation amplifer using a Ã¢â‚¬Å“Transformer-Like-AmplifierÃ¢â‚¬Â (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 Ã¢â‚¬Å“Electronically BalancedÃ¢â‚¬Â 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 10K Ohms.
Low Noise, Low Distortion Operation
Much care 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 5012Ã¢â‚¬Â²s sweet, whisper-quiet performance.
All Portico modules use input and output transformers and almost entirely discrete component amplifiers. In fact, the Line amplifiers on their own, inserted into the signal chain, are capable of enhancing the sonic quality of many signal sources, especially those of digital origin. These are some of the factors that enable the Portico 5012 to work so unobtrusively within the context of a very high quality audio chain.
Incredibly small amounts of musically dissonant odd harmonics can 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. Transformers are the ideal solution to solve this problem. The sweet and silky sound of Mr. NeveÃ¢â‚¬â„¢s classic designs was achieved with big transistors and large high quality transformers. Rupert Neve DesignsÃ¢â‚¬â„¢ Portico modules achieve similar quality today without the bulk or the cost.