Spectra 1964 STX 500 Equalizer


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Spectra 1964 STX 500 Equalizer

STX 500 Equalizer

The STX 500 is the rebirth of the Model 500 2-band passive equalizer. The STX 500 has four frequency selections per band and up to 12dB of boost/cut in 2dB increments. This passive EQ becomes the active feedback element of the STX 100 amplifier. Combined with the STX 100 there is zero insertion loss and introduces virtually zero distortion when boosting or cutting.

Each band also features an individual bypass. High frequency centers are 2.5KHz, 5KHz, 10KHz, and 15Khz. Low frequency centers are 50Hz, 100Hz, 200Hz, and 15KHz. Perfect curves evoke the feeling of classic recordings with every knob turn.

PLEASE NOTE: The STX 500 is designed to connect directly to the STX 100 preamp. The STX 500 has no VPR edge connector of its own to plug into an API-style rack. Therefore it cannot be used in a standalone configuration. 

Spectra Sonics Preamplifiers & Equalizers

Introduced in 1965, the Model 101 Preamplifier Module (above) was the standard by which all other solid state audio amplifiers were judged. The performance and reliability of the 101 established a level never seen before. Its THD and IM distortion measurements were below the residual level of the test equipment of the day, and its noise figure below -127dBu, unweighted. In addition, the 101 was the first solid state audio amplifier to provide peak overload capability of up to 1000%. The 101 Preamplifier was utilized in early Spectra Sonics recording console design, as well as installed in many consoles built by separate manufacturers. The early sounds of Stax and Ardent Studios in Memphis, as well as Muscle Shoals Sound Studio in Alabama is attributed greatly to the Model 101 Preamplifier.

The Model 101 is unchanged today, and is available alone, or incorporated into many of our products, like the Model 610 Complimiter, and the M-502 Pro. The maximum output of the 101 is +18dBu.

The Model 110A Preamplifier Module (above) is an updated version of the Model 101, which implements a bi-polar design (+/- 24V Volt). It was introduced in 1971, and was used in late Spectra Sonics console design. It’s improved headroom and noise specifications earned it an even more “clean” reputation than the original 101 preamp. Its increased maximum output of +24dBu makes it extremely versatile, especially in modern digital recording studios.

Spectra Sonics Preamplifier Gain

Unless otherwise noted, The Spectra Sonics M-502 PRO and M-100 Series preamplifiers are designed to provide 68dB and 75dB of gain, respectively. The designs are identical to the legendary 1020 and 1024 consoles. As a result, two amplifier modules are required per channel. A single amplifier module per channel will not meet the performance standards established by Spectra Sonics nearly 50 years ago.