Martin Audio XE300, Руководство пользователя

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XE300/XE500 User Guide V1.0
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XE300/XE500
USER GUIDE
LIR Linear Phase Crossover Filtering
The Device also includes a new type of crossover filtering “Linear Impulse Response” (LIR)
crossover filtering, which results in a Linear Phase crossover that has a constant delay regardless
of frequency (unlike other types of crossover which delay different frequencies to a different
extent, thus smearing the arrival time). The LIR crossover can thus be described as having a flat
Group Delay response, and thus entirely free of Group Delay Distortion.
The shape of the LIR crossover filter is quite similar to a 4th order or 24 dB/Oct Linkwitz-Riley
filter, and maintains zero phase difference between the adjacent bands across the crossover
region to keep the polar response rock steady.
FIR Linear Phase Equalisation
The Input High-Shelf Equalisers use Finite Impulse Response (FIR) filtering to produce Linear
Phase equalisation; that is all frequencies are delayed by the same amount, perfectly preserving
the transient response. This can also be important in applications where different amounts of
EQ are applied to different parts of a speaker cluster, such as to add ‘Throw’ EQ boost so that
parts of cluster which are throwing further can have HF absorption correction added. If this EQ
is not linear phase, then the zones where the speakers combine may suffer frequency response
anomalies.
USER GUIDE
A dedicated User Guide for the iKON amplifiers is available for download from the Martin Audio
website.