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Spectra 1964 STX100 Mk2 500 Series Preamp

High-bandwidth, 500-series microphone preamp with 64 dB of gain and a 10 Hz to 50 kHz frequency response
MFR# STX 100 MK2

Product Description

The Spectra 1964 STX100 Mk2 500 Series Preamp is a compact, affordable 500 series version of the classic Spectra 101 amplifier circuit—the same discrete preamp design used in the original consoles from the 60s. The STX 100 features an expanded dynamic range, reduced self noise and distortion, and enhanced harmonics for unparalleled performance.


With an impressive 64 dB of gain and an extended frequency response from 10 Hz all the way up to 50 kHz, STX 100 delivers deep, rich lows and silky smooth highs with unparalleled dynamic range. And with convenient features like a 10 dB pad and continuously variable input and output controls, the STX 100 is versatile enough to use in any scenario—for both mic and line level signals.


Traditional analog preamps measure input signals using program peaks, which can reduce your dynamic range by up to 20 dB, limiting your headroom and potentially introducing unwanted distortion. The STX series measures input signals using a VU system, which is not limited by the transient response of a signal. Drums and other percussion instruments can create transient peaks up to 24 dB above the program material average, which would easily create distortion on a traditional preamp. But the STX 100 uses two stages of independent LED overload indicators to effectively eliminate distortion from transient peaks.


Bring your tracks to life with the new and improved Spectra 1964 STX 100. Capture drum recordings that sound like you’re standing in the room right next to the kit. Record guitars with full, rich harmonics that cut through the mix. Take your vocal recordings to the next level with class-leading dynamic range—capture everything from the quietest whisper to the loudest scream. For even more tonal versatility, the STX 100 preamp is custom designed to integrate with the STX 500 two-band passive EQ module.


  • Gain: 64 dB
  • THD: Less than .01% @ 20 Hz - 20 kHz
  • Signal/Noise: Better than 120 dB, (unweighted)
  • Maximum Output: +18 dBm, 20 Hz – 20 kHz
  • Power Requirement: Less than 50 mA, +18 dBm
  • Input/Output Control: Continuously Variable/10 dB Pad
  • Input Impedance: 5K Ohms, nominal
  • Output Impedance: Less than 50 Ohms
  • Frequency Response: 10 Hz - 50 kHz
  • Phantom: 48 Volts
  • Polarity: 180 Degrees/Reverse/Mic or Line Input

Product Specifications

Condition New
Chassis Module
Module Type 500 Series
Module Slot Count 1 Slot

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I would like to thank VK for the wonderful sales assistance, service and prices. This was my first purchase with you and it won't be my last. I only wish I'd discovered you years ago!
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In almost 20 years in Pro audio buying, never did I receive a unit so well packed and exactly as described. Works flawlessly. The whole process has been so smooth. I will never hesitate to do business with you guys in the future and will recommend you to everyone I know.
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This was my first experience buying something from Vintage King (although I surf the "used" categories on the website frequently!), and, despite being on the other side of the world, I had absolutely no trouble and everything went very smoothly.
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The speed of delivery exceeded my expectations! I was VERY pleased that my shipment arrived in time for a scheduled vocal tracking session. The packing insured that my order arrived safely. And the sales staff responded quickly to questions regarding the product.
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