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Millennia M-2B Stereo Tube Preamp  From Millennia

Stereo Vacuum Tube Mic Preamp

Millennia Media

What We Think

I have experience with this unit, both as someone who has sold them and received customer feedback, and as someone who has used them in numerous recording situations, primarily for on-location classical and jazz sessions. I’m not quite sure why these units don’t get a tremendous amount of love, other than the fact that they remain fairly unknown, but they are really quite impressive.

I found that they add that subtle element of musicality and forgiveness to what can sometimes be the unforgivingly truthful sound of a traditional Millennia HV-series mic pre.  A good comparison would be DPA mics: as good as they are, sometimes the truth that they reveal can be a little too much- it’s honestly probably why people often prefer Schoeps over DPA’s. However, what this unit does, while similar to the Schoeps/DPA comparison in terms of musicality and forgiveness, is quite different. It really adds a gorgeous three-dimensional splash of tube texture in a very subtle and unimposing way, without the traditional sacrifices you have to pay when adding tubes to extremely delicate and detailed acoustic recordings. Every time I used it with a pair of small diaphragm condensers, I found that they benefited from the subtle but unimposing warmth that the unit delivered. This is not a tube unit that has a very in-your-face coloration about it, but rather one that can add some real subtle, harmonic activity without a major sacrifice on the detail side of things.

If you are looking for something with its own more personalized tube character and lots of tube warmth, but that still retains excellent detail, think Fearn VT-2, or at less of a budget, perhaps the Anthony Demaria ADL600 (manufactured by Presonus). However, if you are looking for primarily extreme Millennia-like detail with only a mere splash of tube harmonics to warm things up, then this is a really nice choice.

I loved the way this unit interacted with both Schoeps CMC6/MK4’s and MK21’s and with DPA 4011’s and 4006’s, but also with some large diaphragm microphones that ordinarily I never would have thought could have worked on a location situation through a tube unit, because I would have anticipated the combination to be too muddy. I loved the way the Neumann TLM193’s sounded through it.

All this being said, to this point, most of the people using the M-2B (at least the ones to whom we have sold it and to whom we’ve talked about it), from my experience, are location guys, not studio guys. There’s no obvious reason for this, other than that that’s the way it has been consumed. Perhaps it’s the fact that it’s Millennia, and for a lot of location engineers, that’s where it starts and stops. Clearly, there’s a lot of good reasons to put one of these in a serious studio environment as well. In fact, in a lot of ways, it makes more sense to own one of these than an HV3 for many studios, in my opinion, and yet I wouldn’t be surprised if the HV’s sell at a ratio of 100 channels to 1 over the M-2B. I'm pretty sure this preamp will surprise you. -Todd

Millennia's STT-1 Origin Channel Strip Overiew Demonstration

Millennia Media's STT-1 Origin contains their clean/transparent preamp, a four band parametric EQ, Compressor, De-esser, and both vacuum tube and solid state signal path options. It is also possible to link a pair of STT-1s in order to use them as a mix bus/stereo pair - great for mastering. This video provides an overview of the Origin, and covers all of the features. This is also the last video in our Millennia Media video series. Check out all of our other videos featuring Millennia's products.

Manufacturer's Description from Millennia

The World’s Most Elegant Tube Mic Preamplifier

  • Musical, involving, euphonic
  • High speed transformerless, pure Class A, 350 volt
    triode design
  • Differential topology: no attenuator “pads” required
  • Effortless dynamics, vividly realistic ambience
  • >35 dBu output headroom
  • High resolution gain control
  • Precision potentiometers, ultra-premium components
  • Built for critical professional applications
  • Gold audio connectors, tube sockets, and relays
  • 3/8“ thick radius extruded aluminum face plate
  • Durable mirror-gloss anodized finish
  • Mil spec 16 gauge cold-rolled steel chassis
  • Ultra-clean toroid power supply: internal sub-chassis
  • Hand machined aluminum knobs,
    illuminated IT&T push buttons
  • Richly musical vintage vacuum tubes available
  • Mogami Neglex OFC audio wiring
  • Silver Teflon power wiring


  • BK (DPA) +130V mic inputs
  • DC inputs for ideal performance with dynamic and
    ribbon microphones
Millennia Media

About Manufacturer

Established as a classical music recording company in the 1980s, Millennia Media has grown to become one of the world's respected manufacturers of critical audio recording products. Now with more than 40,000 microphone preamplifier channels shipped, Millennia continues to set sonic precedent in solid-state and vacuum tube mic amps, equalizers, compressors, mixers, and recording channels. With numerous industry awards, fourteen TEC nominations, ten PAR Excellence and Reviewer's Pick awards, an E.Q. Blue Ribbon Award, three Stereophile Class A awarded products, an extensive owner's register of leading audio professionals, and a reputation for musical realism second to none, we believe you won't find a more transparent range of professional audio products on the planet.


Minimum Gain

14 dB

Maximum Gain


(3 ranges with continuous trim)

50 dB

Frequency Response


+0 / -3 dB

4 Hz to 130 kHz



50 dB Gain, 10 Hz - 30 kHz, 150 ohm Source

-116 dB EIN

Total Harmonic Distortion + Noise


30 dB Gain, 10 Hz - 20 kHz Bandwidth, 0 dBu Out

< .02%

Intermodulation Distortion


(50 Hz & 7 kHz) 35 dB Gain, +27 dBu Out

< .0009%

Phase Response


35 dB Gain, 20 Hz - 20 kHz, +26 dBu Out

< 10 degrees deviation

Phase Response, Stereo Deviation


35 dB Gain, 20 Hz - 40 kHz, +27 dBu Out

< 1 degree

Common Mode Rejection Ratio


30 dB Gain, 1 kHz, 100 mV C.M.

> 60 dB

Slew Rate


35 dB Gain, +27 dBu Out

> 20 Volts per microsecond

Maximum Input Level


20 Hz - 40 kHz, 14 dB Gain

+20 dBu (no attenuator pads required)

Maximum Output Level


20 Hz - 40 kHz, 10 kilohm Min. Load

> +35 dBu

Interchannel Crosstalk


30 dB Gain, 1 kHz, 0 dBu Both Outputs

< 70 dB

Phantom Input Impedance

3.800 ohms

Output Impedance

120 ohms

DPA (B&K) Mic Powering

+130 V dc max, (non-phantom)

Phantom Powering

+48 V dc, +/- 2 V dc

Power Consumption

50 watts maximum

Power Requirements

Selectable: 100-120, 200-240 V ac, 50/60 Hz

Dimensions/Shipping Weight

19” W x 3.5” H x 12” D, 26 lbs.





M-2B Data Sheet

M-2B Manual