Hybrid Audio Technologies Legatia SE - Manual (Page 42)

Legatia SE User’s Manual ©Hybrid Audio Technologies Page 42 of 73
Attributes
The Legatia L2x is a bi-amplified two-way passive crossover for use with virtually any midrange,
midbass and tweeter pairing Hybrid Audio manufactures. The following are the L2x’s design
attributes:
Filter Set
The L2x is a bi-wired two-way passive crossover that has the following filters:
Lowpass (midrange): 5,700 Hz at 12 dB/octave Linkwitz Riley
Highpass (treble): 5,200 Hz at 12 dB/octave Linkwitz Riley
The only filtering on the board is mentioned above, and in essence are elementary highpass and
lowpass filters common in any two-way crossover design. As noted above, there is no board-
mounted equalization specific to one brand or type of midrange or tweeter, or common of competitor’s
designs where equalization correction (filtering) is added. The L2x can be used with any number of
drivers we produce (including any midrange, midbass, and tweeter from the Imagine, Unity, Clarus,
Legatia, Legatia SE, and Legatia SE Pro range of offerings). The more common uses for the L2x are
Legatia L6SE, paired with Legatia SE L1 Pro, or Legatia SE L1 Pro R2, but the design is not limited to
those uses and can be expanded to any number of possible bespoke two-way configurations, or used
as the two-way dividing network for midrange and treble drivers in a “quasi-active” three-way system,
where the midbass is actively cross-over at the amplifier.
The L2x passive crossover networks incorporate super high quality and low tolerance metalized
polypropylene film capacitors, air-core inductors, and low tolerance non-inductive resistors. No
output level switches were used in the passive crossover design because switches add a resistive
effect and are typically of extremely low quality. Additionally, “jumper pins” add an unnecessary pair
of splices in the signal path to the tweeter, and were not included in our design either. Rather, all
tweeter level adjustments are done on the board level with dedicated non-inductive resistors; tweeter
attenuation is accomplished by selecting the appropriate output (-3 dB, 0 dB, or +3 dB) on the passive
crossover circuit board. The components selected are complimentary and ensure no appreciable
signal degradation between the input and output side of the crossovers. Likewise, the capacitors and
inductors are arranged on the board to reduce the coupling between circuits and electromagnetic
interference by basic physical separation, while still keeping the footprint size of the circuit board
small. Finally, the use of 12 dB/octave filters on both low pass and high pass minimizes phase-
related distortion typical of crossovers with mismatched orders, and ensures relative phase-
coherency.
Connection
The L2x has convenient spring-loaded terminals for wire connection. Bare wire can be twisted tightly
and inserted into the spring-loaded terminal, however Hybrid Audio recommends that the wire be
tinned with solder to avoid oxidation, fraying, and to promote a better connection. The following is the
connection nomenclature on the L2x, from left to right on the circuit board:
+WF
Woofer positive input from amplifier
IN - Woofer negative input from amplifier
+WF Woofer positive output to Hybrid Audio Technologies midbass or midrange positive terminal