Spectra 1964 STX 100 500 Series Microphone Pre Amp

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You've Heard it before. Spectra preamplifier modules have been used to record countless hit records across the decades, and helped to define the sound of American music from Soul sounds of Stax and Ardent Studios in Memphis , to Rock and Roll of Muscle Shoals Sound Studio in Alabama. Un-changed, and still un-matched, the Spectra sound is now available in a no compromise 500 series format. 

 The STX 100 represents an affordable alternative for employing the same Spectra Sonics technology of our famous recording desks made over 40 years ago. The unique circuit topology of the STX 100 utilizes a 100 series discrete preamplifier design that was at the heart of every console built by the company. The result is unequaled performance in terms of expanded dynamic range (headroom), low noise and distortion, as well as extended harmonic content of the amplified signal.

Most, if not all, conventional analog audio amplifiers live in a world whereby dynamic range limitations are dictated by audio program peaks. Audio program peaks, which can average 6dB to over 20dB, effectively reduce the undistorted output of a given amplifier by that peak to average ratio. The reduction in output limits headroom (dynamic range), increases numerous forms of distortion, and limits the harmonic content of the amplified audio signal.

The STX series lives in the VU world, irrespective of peak to average transient audio program signal material. When a percussion instrument is the source, it is not uncommon to measure transient peaks that are 12dB-24dB above the program material average. Again, the STX series products are not affected by the high transient peak excursions. The first and second stages of the STX 100 utilize independent LED overload indicators to monitor program overload conditions. The result is faster set-up time with consistent and definable results. Drums sound like you are positioned next to them. Guitars have full harmonic content. The dynamic range of vocals is preserved.


Gain: 64dB

THD: Less than .01% @ 20Hz-20KHz

Signal/Noise: Better than 120dB, (unweighted)

Maximum Output: +18dBm, 20Hz–20KHz

Power Requirement: Less than 50mA, +18dBm

Input/Output Control: Continuously Variable/10dB Pad

Input Impedance: 5K Ohms, Nominal

Output Impedance: Less than 50 Ohms

Frequency Response: 10Hz-50KHz

Phantom: 48 Volts

Polarity: 180 Degrees/Reverse/Mic or Line Input