Neve 1084
Rupert Neve's 1073 with the training wheels off - three sweepable EQ bands, a high-pass and a low-pass filter, and the same Class A front end that made the 1073 famous.
Overview
The 1084 answers the one complaint engineers had about the 1073. The 1073 gave you a fixed 12 kHz high shelf and a single mid band. The 1084 opens up the high frequency to selectable 10 kHz, 12 kHz, and 16 kHz shelving points and adds a low-pass filter alongside the high-pass. Neve's own documentation describes the two modules as sharing the same technology. The 1084 is built on the 1073's foundation: same Class A mic preamp, same transformer-balanced input and output, but with a more flexible EQ section. Owners who have worked both modules tend to describe the 1084 as the one you reach for when the source needs surgery rather than a broad stroke.
The numbers behind that front end are why these modules still command the prices they do. The microphone input is transformer balanced and earth free, with an input impedance of 300 or 1200 ohms and gain running from +80 dB down to +20 dB in 5 dB steps. The line input is a 10,000 ohm bridging load with gain from +20 dB to -10 dB, also in 5 dB steps. Maximum output is specified at greater than +26 dBu into 600 ohms, with an output impedance of 75 ohms at 1 kHz. Distortion is quoted at no more than 0.07 percent from 50 Hz to 10 kHz at +20 dBu output into 600 ohms, measured across an 80 kHz bandwidth. Frequency response holds within ±0.5 dB from 20 Hz to 20 kHz with the EQ out, rolling off to -3 dB at 40 kHz. Noise sits at no more than -83 dBu across all line gain settings with the EQ in or out, and equivalent input noise is better than -125 dBu at 60 dB of gain.
The EQ section is where the 1084 separates itself. The high frequency band offers smooth ±16 dB shelving with three selectable corner frequencies - 10 kHz, 12 kHz, and 16 kHz - so you can brighten a source without automatically adding the 1073's 12 kHz signature. The low frequency band mirrors the 1073: smooth ±16 dB shelving at 35 Hz, 60 Hz, 110 Hz, or 220 Hz. The mid band is the real upgrade. It's a peaking design with selectable centre frequencies of 0.36 kHz, 0.7 kHz, 1.6 kHz, 3.2 kHz, 4.8 kHz, and 7.2 kHz, with a choice of ±12 dB or ±18 dB range and a switchable high-Q setting. That high-Q position gives the 1084 its reputation for presence work. It's narrow enough to carve a specific frequency out of a mix or push a vocal forward without dragging the whole midrange with it.
Both filters are 18 dB per octave. The high-pass switches between 45 Hz, 70 Hz, 160 Hz, and 360 Hz. Note the 45 Hz starting point rather than the 1073's 50 Hz. The low-pass switches between 6 kHz, 8 kHz, 10 kHz, 14 kHz, and 18 kHz, and the 1073 simply doesn't have one. The front panel also carries the familiar EQL button to switch the equaliser in or out of the circuit and a phase button that flips the balanced output 180 degrees.
One detail trips up new owners, and it's the high-pass filter. It's a passive design, and Neve's documentation is explicit that it must be correctly terminated to achieve a flat response. A 5k1 resistor is fitted inside the module on the back connector between pin E and pin K, the fader send. In consoles where the fader connection isn't used, which is most Neve 45 series desks except the BCM10, that resistor stays in place. Where the fader is used, including BCM10 consoles and AMS Neve's own 1073/1084 racks, the resistor has to be disconnected and replaced with a fader or potentiometer of 4k7 to 5k ohms. Get this wrong and the module will deliver incorrect levels and an uneven frequency response. It's the first thing to check when a 1084 sounds off in a rack that wasn't wired for it.
The module's place in Neve's own lineup is documented clearly. A 1973 drawing from Rupert Neve & Company notes that the 1084 has smooth controls and replaces the 1073, while the 1085 has stepped controls and replaces the 1076. A third variant, the 1082, is described as similar to the 1084 but with a 30 Hz setting instead of 45 Hz on the high-pass filter and all potentiometer designations inverted. The 1084 is tied to the 45 series consoles, and the same manual that covers the 1084 also covers the 1073, which it describes as in manufacture since the early 1970s.
AMS Neve still offers the 1084 EQ circuit as an option in current products. The company's advertising for the Genesys Black console lists a choice of Neve 88R four-band EQ or Neve 1084 Classic EQ alongside the 1073 mic preamps. That's a fifty-year-old equaliser design sold as a premium option on a digitally controlled analogue desk. It also means the 1084 name now covers both the original modules and their modern reissues.
For anyone tracking down an original, the module is a 45 series console strip, and its condition depends heavily on which console it came out of and how it was maintained. The passive high-pass filter's termination requirement means a module pulled from a console and installed in a rack may need that 5k1 resistor addressed before it behaves. Collectors note that the 1084's additional filter and EQ flexibility make it a more versatile single module than the 1073, though the 1073's simpler fixed-frequency design remains the better known of the two. Both share the same transformer-balanced, earth-free input and output topology and the same Class A gain stage.
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