The Spectra 1964 STX100 MK2 500-Series Preamp
is a 500 Series version of the classic Spectra Sonics 101 amplifier
circuit. The STX 100 is a high-bandwidth microphone preamp with 64dB of
gain and a 10Hz to 50KHz frequency response. A 10dB input pad and a dual
potentiometer offers continuously variable input pad and output level
controls allow the STX 100 to be used with both microphone and line
level sources.
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.
To complete the classic Spectra Sonics console channel
configuration, the STX 100 has integrated connections for inserting the
STX 500 2-Band Passive Equalizer module.
Spectra 1964 STX100 MK2 500-Series Preamp Specifications
- Gain: 64dB
- THD: Less than .01% @ 20Hz-20KHz
- Signal/Noise: Better than 120dB, (unweighted)
- Maximum Output: +18dBm, 20Hz20KHz
- 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