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| Analog
Passive Crossovers |
Passive
crossovers have enjoyed widespread use for over one hundred years.
They range from very simple and low cost, to extremely complex and
expensive. Design requirements for passive crossovers are complicated
by the non-ideal nature of the components themselves, and the fact
that the passive networks are loaded by the transducer impedances,
which are highly complex.
CrossoverShop provides extensive tools and features to tackle these
passive crossovers utilizing both automatic synthesis and powerful
optimization. Actual transducer data for both acoustic SPL and electrical
impedance can be imported for each transducer. Moreover, parasitic
component models are featured representing real world components.
A variety of powerful synthesis tools are available, including fully
automatic and optimized design of conjugate networks to flatten any
transducer impedance. |
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| Analog
Active Crossovers |
Active
crossovers are also historically known as bi-amped or tri-amped systems
with respect to 2-way or 3-way designs. All active crossovers utilize
independent multiple power amps for each section, with the transducers
directly attached to the power amps. Active crossovers are the favorite
of high power high performance systems with far lower losses and distortion.
CrossoverShop provides two levels of analog filter modeling: high
level transfer function blocks, and low level actual circuitry. The
filter synthesis tools produce designs as transfer function blocks
which can then be realized into actual circuitry. Optimization is
also invaluable here.
Multiple libraries are included for over 1,500 opamps containing accurate
gain bandwidth, input/output impedance, and voltage/current noise
models. Extremely fast circuit analysis even with dozens of opamps. |
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| Digital
FIR Crossovers |
With
the modern advancements in digital signal processing, digital crossovers
are becoming increasingly common. Many things are possible with digital
filters that were traditionally difficult in the analog domain. Time
correction is trivially easy, and constant group delay using FIR filters
also becomes possible.
FIR filters offer the ability to apply equalization of driver/enclosure
defects as never before resulting in razor flat response. Due to the
extremely high order of FIR filters, nearly any response curve can
be produced. The extremely sharp transitions at the crossover knees
virtually eliminate multiple driver lobing and off-axis effects.
CrossoverShop provides FIR synthesis with coefficient export in a
wide variety of formats. Finite precision simulation is also included. |
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| Digital
IIR Crossovers |
The
second class of digital filters are the IIR type. These filters essentially
emulate the well known classic response behavior of analog filters.
IIR filters are created by transforms of prototype analog filters.
A set of analog crossover filters are first designed, and then various
transforms used producing IIR equivalents.
CrossoverShop provides many different types of transforms since each
has its own particular characteristic. Finite precision effects can
also be explored which are critically important for IIR filters. Advanced
optimal approximation and frequency sampling methods are also available
for detailed equalization. |
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