PreSonus Eureka™

Oct 3, 2003 12:00 PM, Editors


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This Class-A transformer-coupled mic preamp offers a versatile new channel strip device that features variable impedance and a saturation knob for tube-saturation emulation.

The Eureka sports a full-featured compressor with variable threshold, attack, release and gain makeup. It offers a soft-knee compression mode and a highpass filter on the sidechain for frequency-dependent compression, which is useful for de-essing and other frequency-specific compression applications.

The Eureka, complete with an audio transformer on the input stage, offers a fully parametric 3-band EQ with overlapping bands and switchable staging for the EQ and compressor, allowing the user to swap the order of the EQ and compression.

The Eureka has instrument, line and microphone inputs, as well as switchable gain reduction for the VU meter, dual outputs (TRS and XLR) that can be used simultaneously, and an optional digital output card capable of up to 24-bit 96khz output on AES/EBU or S/PDIF. In addition, the unit has a 48-volt phantom power unit with an 80Hz rumble filter, a –20dB pad, a Phase Inversion button, and balanced send and return jacks to insert outboard gear.

In other company news, its MaxRack™ is now shipping. A desktop space solution, which houses up to six 1/3-rack PreSonus Personal Recording Series units, the new rack, can store new PreSonus units such as the TubePRE™, EQ3B™, COMP16™ and HP4™.

The MaxRack is designed to sit on the desktop next to the user’s computer monitor. The heavy-duty rack not only houses six units, but also ships with a six-input powerstrip that accommodates all six individual power supplies and powers all of them from one single AC plug (available in 110-volt U.S. and 220V European only).

The new HP4 comes in a 1/3-rackspace chassis, similar to the TubePRE, and fits snugly into the MaxRack. The HP4 accepts balanced/unbalanced inputs (stereo or mono) and outputs (1/4-inch TRS), with the Mono Selector button on the front channel copying both inputs to both sides. The unit features four discrete headphone outputs, each with its own volume potentiometer and 250 mW of amplification per channel, on the front panel. The HP4 has a -98dB noise floor and a wide frequency response. Also, the unit allows control over control room monitors with a separate volume potentiometer that can be muted using the Monitor Mute button, and is powered by an external wall-mounted power supply.

PreSonus’ COMP16 compressor/limiter features many of the presets contained in its BlueMax™, but offers 16 preset, variable input and output compression curves that include vocal, percussion, fretted, keyboard, limit and effect. The front panel boasts a large, blue, backlit VU meter that can either be used to monitor output level or gain reduction, and there is also a Bypass button to compare the processed and nonprocessed signals. Other features include -98dB noise floor, +24dBu headroom, balanced I/O and a wide frequency response. The back of the unit houses balanced (XLR) and unbalanced (1/40inch TRS) inputs and outputs. The COMP16 is powered by an external wall-mounted power supply.

The EQ3B offers three bands of fully parametric equalization with each band offering adjustable frequency range, Q and cut/boost control. The faceplate also hosts a Bypass button and 80Hz roll-off. Other featured specifications include -98dB noise floor, +24dBu headroom, balanced I/O and a wide frequency response. The back of the unit houses balanced (XLR) and unbalanced (1/4-inch TRS) inputs and outputs. The EQ3B is powered by an external wall-mounted power supply.

The TubePRE™ is a single-channel preamp based on a 12AX7 vacuum tube circuit that provides a stable, transformer-free signal path. The unit can be used as the first stage of a live or studio system, as a direct box or in a side effects chain. The dual-servo gain-stage design does not use capacitors, providing ultralow-noise performance and wide dynamic control that allows it to boost the desirable signal without increasing unwanted background noise. The TubePRE™ offers a frequency range of 10-80k Hz, a noise floor of 94 dBu and a signal-to-noise ratio of greater than 9 0dB. Unweighted THD + Noise is typically 0.05% with no Tube Drive used and up to 10% with 20 dB of Tube Drive.

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