Spectra 1964 STX 500 is a two-band passive equalizer that connects directly to the STX 100 preamp and becomes the active feedback element of its amplifier. Each band offers four selectable centre frequencies and up to 12 dB of boost or cut in 2 dB steps.
EQ that costs you no signal
A conventional passive equalizer attenuates everything and needs a make-up stage that brings its own noise and phase shift. Here the EQ works inside the STX 100 feedback loop, so insertion loss is zero and added distortion or phase shift is effectively absent. The tone shaping happens ahead of the converter rather than inside the mix.
Settings you can repeat next session
Fixed 2 dB steps and a fixed set of frequencies mean a setting written on a track sheet comes back exactly a week later. High band centres are 2.5 kHz, 5 kHz, 10 kHz and 15 kHz; low band centres are 50 Hz, 100 Hz, 200 Hz and 300 Hz. Each band has its own bypass, so an A/B against the unprocessed signal takes a second. The module needs a direct connection to an STX 100 and does not run on its own, as it carries no VPR edge connector.
KEY FEATURES
- Two-band passive equalizer designed to pair with the STX 100 preamp
- Zero insertion loss thanks to operation inside the feedback loop
- Four selectable centre frequencies per band
- Up to 12 dB of boost and cut in 2 dB increments
- Independent bypass for each band
- Built at the Spectra 1964 facility in Ogden, USA
TECHNICAL SPECIFICATIONS
- Type: two-band passive equalizer
- High frequency centres: 2.5 kHz, 5 kHz, 10 kHz, 15 kHz
- Low frequency centres: 50 Hz, 100 Hz, 200 Hz, 300 Hz
- Range: up to 12 dB boost and cut
- Step size: 2 dB
- Bypass: independent per band
- Insertion loss: zero when combined with the STX 100
- Requirements: direct connection to an STX 100 preamp, no own VPR edge connector
- Components: over 95% sourced in the USA and Europe
