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The Roger Nichols Gear Collection
Studio & Recording > Preamps > Channel Strips > PreSonus Eureka

PreSonus Eureka

Item ID: Eureka

Transformer-coupled Variable Impedance Microphone Preamp, Compressor, and EQ

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From Our Research Team:

Strike Gold With The Eureka Channel Strip!

The Eureka channel strip features a Class A transformer-coupled mic preamp with variable impedance as well as a saturation knob for tube saturation emulation.



PreSonus Eureka Channel Strip at a Glance:
  • Channel strip with full-featured compressor
  • Includes 3-band EQ
  • Handles mic, line, and instrument sources
  • Digital option turns Eureka into DAW front end!


The Eureka sports a compressor with variable threshold, attack, release and gain makeup. It offers a soft knee compression mode, as well as a high-pass 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 three-band EQ with overlapping bands and switchable staging for the EQ and compressor, enabling you 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 for inserting outboard gear.

Digital connection for the Eureka!
Turn the Eureka into a digital front end for your DAW! With the optional AD192 card, the ultra flexible Eureka becomes even more powerful by adding high-quality digital output to a professional recording channel with microphone input impedance selection, tube simulation, variable compressor and ultra smooth three band parametric EQ.

PreSonus Eureka Preamp Features:
  • Award-winning Class A transformer-coupled mic preamp
  • Variable impedance -- especially useful for ribbon microphones
  • Saturation knob for tube saturation emulation
  • 48V Phantom power
  • 80 Hz rumble filter
  • -20dB pad
  • phase inversion button

PreSonus Eureka Compressor Features:
  • Full featured compressor: variable threshold, attack, release, ratio, gain makeup
  • Hi pass filter on the sidechain -- allows for de-essing and other frequency specific compression applications
  • Soft knee compression mode

PreSonus Eureka Equalizer Features:
  • Fully parametric three band equalizer with overlapping bands
  • Switchable staging for the EQ and compressor -- place the compressor before the EQ or vice-versa


PreSonus Eureka Additional Features:
  • Gain Reduction or Output metering for VU meter (switchable)
  • Balanced Send and Return Jacks for Inserting Outboard Gear
  • Instrument, line and microphone input
  • Dual outputs: TRS and XLR. Both can be used simultaneously

Eureka Image Gallery

Specification Detail
Preamp Type Solid State
Number of Channels 1
Frequency Response 10Hz-50kHz
Phantom Power Yes
EQ Yes
Compressor Yes
Other Processing No Other Processing
Analog Inputs 1 x XLR (Mic), 1 x 1/4" (Line), 1 x 1/4" (Hi-Z)
Analog Outputs 1 x XLR, 1 x 1/4"
Digital Inputs No Digital Inputs
Digital Outputs No Digital Outputs
Other I/O 2 x 1/4" (Send, Return)
Computer Connectivity No Computer Connectivity
Rackmount Spaces 1U
Height 1.75"
Depth 7"
Width 19"
Weight 8 lbs.
Manufacturer Part Number EUREKA

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Reviews

based on 32 reviews

Eureka! I have found 'it'!

by Jay Shaindlin from Denver, CO, USA
February 2, 2012
Music Background: Voice talent, veteran broadcaster, certified Broadcast Engineer(CBRE)
I've been a voice talent for 34 years now, and I've used them all. Every microphone, every processor, every layout known to man. When I found myself in need of a new preamp for my loft studio micropho... read more [+]ne, I asked around. A certain famous friend of mine in Sherman Oaks suggested the Avalon 737. I used one for a couple of years, but I just couldn't find the kind of character and presence I was looking for. (Something I call the teak-wood characteristic.)

I decided to just go with a modest tube preamp and push it through my Urei LA4, and that sounded decent, but not quite the clean signal I was hoping to get from the preamp.

I looked and looked for the perfect combination...something that would give me the best performance at each stage(pre, comp,and EQ). I had Symetrix 528e, and numerous others through the years, but none of them gave me goosebumps.

Finally, I found a loaner Presonus Eureka at my company's R&D department. I took it home to put it through it's paces, and well, here I am, gushing.

I've used the same microphone for 13 years now. It's an Audio Technica 3525, small-diaphragm condenser, the best little microphone I've found. It rivals all the top-dollar standard studio microphones you'll find in all the big radio stations. In fact, it buries them. After 13 years, I had feared my AT was getting tired. When my last preamp died, I feared it may have damaged my mike, or that perhaps the mike was faulting and damaged the pre.

So I disassembled the AT and meticulously restored it to as-new condition, and then searched for the preamp that would be worthy of this loyal microphone.

When I plugged in the Presonus Eureka, nothing happened. One of the ribbon cables on the main board had shaken loose. So that quickly fixed, I flipped the switch again, and started playing with the variable impedance, the tubessence, the compressor and the PEQ, and after about ten minutes, I was ready to start recording.

I launched into a 10-minute talk-show segment, to experiment with the Presonus in a typical live talk setting, and by the time I was finished, I was quite eager to listen to the playback in my upstairs den.

My wife and I were nothing short of amazed at the finished product. The transparency, the warm low-end was never boxy or unnatural, it was just naturally resonant. The punch in the medium to upper register was gently governed without sounding clippy, and the signal-to-noise was remarkable.

The performance rivals the performance I have gotten in the past in radio studios using the Neumann U87 with high-end processing.

Considering that this solution costs roughly one fifth the price(in 1999 dollars), I'm very happy I decided to give the Presonus a try.

One further note: I see a lot of critics here who bash the Eureka for various reasons. All I am saying is that if you are using the gear the right way, and not trying to get it to produce effects it wasn't designed to produce, that's hardly an indication that the quality of this unit is inferior.

This unit does EXACTLY what it was designed to do, and it does it better than 99 percent of the gear on the market. Trust me. I am an expert. close [-]

Next level gear

by Bryce Kaminsky from Winnipeg, MB Canada
August 23, 2011
Music Background: Recording Engineer / Musician
This gear has raised the bar for everything I record. I would not even consider running vocals through my old preamp unless I had to. Also the Hi-Z input is off the charts. The bass was instantly ... read more [+]better and I will only ever run my Bass di that way from now on. GET ONE. close [-]

Opinion for Presonus Eureka

by Luis Gines from Manati, Puerto Rico
June 17, 2011
Music Background: Recording Engineer
My opinion is that this was one of my best purchases I've ever had, the team has given me tremendous EUREKA result in wind instument recordings and voices, I'll buy another.

thanks

great preamp

by J.L from Pittsburgh Pa
September 22, 2008
Music Background: artist/producer
bought this preamp acouple of weeks ago and have a bluebird running into it and must say iam very pleased by itz performance would recommend for anyone in a home studio

Excellent

by Carl from Dayton, OR USA
January 30, 2008
Music Background: Recording Engineer, Musician
This piece of equipment takes my project studio to the next level. The pre amp is awesome, from completely transparent to add color and warmth with the saturation control. The compressor is very eas... read more [+]y to use going into the DAW and is a real help with vocalists that have a little trouble controlling their dynamics. I use a TLM103 for most vox so seldom need EQ for that mic, but it’s handy for getting the best out of acoustic guitar. I couldn’t be more pleased with this piece of equipment and I highly recommend it. close [-]
Read more reviews

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See Also: PreSonus , PreSonus Channel Strips

PreSonus Eureka

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