Product details

The SPL Audio Passeq is a high-end, dual-channel analogue passive equalizer designed for professional mixing, mastering, and critical audio processing. Combining a carefully engineered passive filter network with SPL’s 120 V Rail Technology in its make-up amplification stage, it delivers extensive tonal-shaping capabilities with generous headroom and a distinctive, musical response. Its six independently adjustable equalisation sections provide separate low-, mid-, and high-frequency boost and cut controls, allowing engineers to refine tonal balance, enhance clarity, and create detailed, polished mixes. Precision frequency selection, carefully matched filter components, and balanced transformer-coupled inputs and outputs make it a powerful tool for mastering studios and premium recording environments.

Key Features

Dual-Channel Stereo Design: Independent left and right channel processing for stereo mixing and mastering applications.
Passive Six-Band Equalisation: Three dedicated boost bands and three dedicated cut bands covering low, mid, and high frequencies.
72 Filter Frequencies per Channel: Twelve selectable frequencies for each of the six EQ sections, providing 36 boost and 36 cut frequency options per channel.
Independent Boost and Cut Controls: Separate frequency selection and level adjustment for precise tonal shaping.
Extended High-Frequency Processing: The updated PASSEQ Mastering Equalizer includes 25 kHz and 35 kHz high-frequency boost options for subtle air and brilliance.
Optimised Filter Design: Individually tuned filter components and frequency-specific Q characteristics support smooth, musical equalisation.
SPL 120 V Rail Technology: High-voltage make-up amplification designed for substantial headroom and excellent transient handling.
Balanced Transformer-Coupled I/O: Lundahl transformers and balanced XLR connections support professional studio integration.
Precision Controls: Detented potentiometers and rotary frequency selectors enable accurate setting recall.
Auto-Bypass Function: Configurable automatic bypass for convenient A/B comparisons, alongside manual channel bypass.
Frequency Response: 10 Hz–200 kHz (−3 dB transmission bandwidth).
Maximum Input Level: +32.5 dBu.
Maximum Output Level: +32.5 dBu.
Input Impedance: 20 kΩ, balanced.
Output Impedance: Less than 600 Ω, balanced.
Noise: −91.8 dBu, unweighted, with gain at 0 dBu and EQ boost/cut disabled.
Power Supply: Internal linear power supply with selectable 115 V or 230 V operation, depending on the model configuration.
Power Consumption: Approximately 9.5 W.
Rack Format: 19-inch rackmount, approximately 4U.
Dimensions: 482 × 177 × 311.5 mm (W × H × D).
Weight: 10.2 kg.