With 72 passive filters (36 x Boost, 36 x Cut per channel), the SPL PASSEQ surpasses all previous designs of this type 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 with 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 noteworthy 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 ensure 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.
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
120 V makeup amplifiers based upon SPL unique SUPRA-OPs with 150 dB 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
XLR contacts from Switchcraft
Switches and potentiometers from Elma and ALPS (including ALPS “Big Blue” with 41 steps)
Internal, linear power supply featuring a generously proportioned toroidal transformer and voltage selection (110-120 V, 60 Hz or 220-240 V, 50 Hz)
SPL is one of the premier designers of studio equipment, mastering hardware, and hi-fi audio gear. In this buyer’s guide, we'll break down everything you need to know about the storied gear manufacturer, including an intro to the company, an overview of its catalog, and the details of its key products.
With such a broad range of offerings, we’ve separated this buyer’s guide by product category for easier navigation, including sections covering SPL’s mic pres, channel strips, mixing processors, monitor controllers, mastering equipment, and home hi-fi gear. Let’s get started. Continue reading →
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