APEX GX 130 is a 30 band 1/3 octave graphic equaliser built to the highest professional standards in electronics and mechanics.
APEX GX 130
Main features and specification for APEX GX 130:
- 30 band constant Q precision DLT graphic equalisers
- Sweepable highpass filter with 12dB/oct slope.
- Sweepable lowpass filter with selectable 6 or 12 dB/oct slope
- Graphic equalisers in-out switchable.
- Switchable scale 6/12 dB on graphic equalisers.
- 6 dB of gain available.
- Extremely low distortion and noise.
- True differential input circuitry.
- Effective HF interference cancelation on in- and outputs through perfectly HF balanced stages
- XLR in- and outputs.
- Accurate “peak-stretching” overload indicators.
- Failsafe bypass.
- Earth-lift switch.
- Power transformer with low flux windings and magnetic screening, reducing magnetic stray field to other units.
- Wide mains-voltage range.
- Professional parts and construction
The APEX GX130 is a 30 band 1/3 octave graphic equaliser, incorporating APEX newly developed DLT hybrid circuits. A highpass and lowpass filter precedes the equaliser. The unit is built to the highest professional standards both for electronics and mechanics.
The heart of the graphic equaliser is a bank of 30 bandpass filters, one filter for each 1/3 octave frequency. Conventional equaliser designs use discrete components to realise these bandpass filters.
Although it is possible to build very good equalisers with this technology using precision components, far better results can be achieved with dynamically trimmed hybrid circuits. This is what
DLT stands for: Dynamic Laser Trimming.
At the factory, each filter of the graphic equalisers is laser trimmed to match “mother nature’s” prescription for ideal response. This results in perfect combining of the individual filter response curves and, therefore, a perfectly flat amplitude and phase response. All the filter components are incorporated on the hybrid circuits. As a final production step, each bandpass filter is adjusted for the correct 1/3 octave center frequency and bandwidth, using a specially developed trimming algorithm for adjusting the centre frequency and bandwidth simultaneously. Incorporating all filter
components on the hybrid circuits yet has another important advantage: because of the largely reduced number of soldered connections, reliability is boosted to an extent only exceeded by
integrated circuits (some call it “fit and forget technology”).
The controls of the graphic equalisers provide up to 12 dB of reciprocal cut and boost at the 30 distinct centre frequencies. The filters of APEX GX 130 preserve optimal filter bandwidth, whatever
the settings of the controls.
Because of this ‘constant Q’ circuitry, filter response does not broaden at low cut or boost settings (fig 1.2). In this way filter interaction is minimised and the ‘graphic’ qualities of the equaliser
The graphic equaliser of the GX 130 is switchable IN and OUT of the signal path. The complete unit can be bypassed by switching it off. The failsafe relays will react as if there were a mains failure
and will link the input of each channel to its corresponding output.
APEX GX 130 has an electronically balanced input and a balanced, floating output stage. The output circuit actually simulate a transformer with a 10KOhm impedance to ground for each leg.
Both the input and output circuits are factory adjusted for optimum balance at low and high frequencies. This results in increased interference immunity of the unit.
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Glossary: APEX GX130, APEX GX-130