SPL Passeq 2595 Passive EQ

SPL Passeq Passive Equaliser Highlights

The Passeq complements SPL's parametric Equalizers the Qure and PQ 2050 by a classic design with passive coil filters that perfectly fulfills the highest expectations in all areas of audio processing, from recording through mixing to mastering.
The superior sound qualities and musical characteristics of passive filters ideally meet increasing demands in creating sound colours full of character.

Unique Features

• The most powerful passive EQ ever made 144 passive filters (72 per channel) in one EQ.
• Individual coils per filter.
• Single core coils, which means that every one is wound individually on its own dedicated core. This excludes sonic degradation from mutual influences while at the same time improving THD values.
• 120V makeup amplifiers based upon SPL unique SUPRA-OPs with 150dB dynamic rage and 200 v/ms slew rate.
• Individual design and component specificity for each filter.
• Custom made coils for critical mid-frequency ranges.
• Boost and cut crossovers mesh perfectly so that with the high number of frequencies one can dependably command the most elaborate set of response curves that to date any passive EQ has offered.
• Transformers from Lundahl with perfectly matched sonic characteristics provide for balanced I/O stages.

Description

With 72 passive filters per channel (36 x Boost, 36 x Cut), the Passeq surpasses all previous designs of this type of EQ by a wide margin. Each channel is divided into three Cut and three Boost bands, each offering 12 switchable frequency ranges. The Cut and Boost ranges are not identical; crossovers are designed to work like a precise mechanic cogwheel so as to allow the engineer access to the largest possible number of optimal, wide-band S-curves with variable slopes.

A further remarkable Passeq feature is its individual sonic adaptation of each inductive filter through separate coil/condenser/resistor combinations: In stark contrast to earlier filter design and construction, each Passeq filter is optimized for the frequency assigned.
To insure the best possible signal warmth, richness and musicality in processing, coils for critical voice frequencies are custom-made for the Passeq.
This achieves the widest possible range and tonally appealing sound color palette from any passive EQ.

The Passeq employs two distinct filter types: One of these functions much like traditional shelving filters, while the other, as a peak filter, and together, they provide the combined characteristics of wide-band control in low and high ranges with more specific frequency range control in mids. This selection minimizes mutual influences between low, mid and high bands while providing a more selective control in the mids is often useful.
Mid boost and cut, as well as HF boost filters have been set up in a peak (bell) configuration, while the hi cut, low cut and low boost filters function in a shelving configuration. The HF boost band offers variable values from Q=1 to 0.1.

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