On this article, Vance Dickason highlights the probabilities for a two-way DSP filter design utilizing the CrossLite+ software program package deal. Underneath improvement by the Brazilian professional audio firm since 2009, CrossLite+ is a dual-channel FFT analyzer that can perform with mainly any USB-type recording interface. CrossLite+ is meant primarily for product improvement of DSP-powered professional audio system and to be used in dwell sound PA techniques. And measured information may also be imported from different analyzers such because the CLIO or Klippel This text was initially printed in Voice Coil, December 2021.
Underneath improvement since 2009, CrossLite+ is a dual-channel FFT analyzer that can perform with mainly any USB-type recording interface and a measurement microphone. Measured information may also be imported from different analyzer as Rational Acoustics Smaart, Audiomatica CLIO, Klippel KA3, and ARTALabs ARTA. As soon as information has been measured or imported to CrossLite+, it may be used to design a whole crossover for a powered loudspeaker.
As soon as information has been measured or imported, CrossLite+ can be utilized to design a whole crossover for a powered loudspeaker. Subsequent, a person can create DSP FIR and IIR filters — excessive move (HP), low move (LP), shelving HP/LP, and parametric EQ — these can then be downloaded to processing platforms that presently embody miniDSP and Armonia Plus from Powersoft. For powered studio monitor design or powered WiSA dwelling theater audio system, this needs to be an excellent instrument for designing DSP-type powered loudspeakers.
I needed to offer some extra element about this fascinating software program through a brief two-way speaker design tutorial. The drivers that F.MonteiroScience used for this explication had been an 8” professional sound woofer and a 1” titanium compression driver and horn.
Determine 1 and Determine 2 present the response curves (each on- and off-axis) measured by the built-in Quick Fourier Remodel (FFT) analyzer — the crimson curve being the woofer and the inexperienced curve the titanium high-frequency driver. Determine 3 illustrates the tactic used to do a sensitivity calculation. On this case the high-frequency driver was decided to be an 8.8dB SPL differential between the 2 drivers.
Subsequent, a flat goal response was utilized to each drivers and Crosslite+ optimized the FIR filter response as seen in Determine 4 and Determine 5. Nonetheless after optimizing the filters, we nonetheless have a sensitivity challenge. Be aware additionally the impulse curves on the prime of the graph in Determine 5 point out that these drivers weren’t time aligned. graph in Determine 6, Crosslite+ has now adjusted the sensitivity and corrected the alignment challenge by zeroing the part.
The outcome was an acceptably flat response profile. The Wavelet Remodel proven in Determine 7 confirms the part linearity in any respect frequencies, in addition to symmetry between left and proper impulse sides, whereas Determine 8 reveals the corrected part response that facilitated the time alignment of the 2 impulse responses.
One other technique to examine part linearity in any respect frequencies, is to make use of the complicated (actual and imaginary) switch perform 3D graphs proven in Figures 9–11. Wanting on the graph proven in Determine 12, a reminiscence button has allowed us to match the unique on-axis response with the ultimate FIR developed filter response. This whole filter set can now be downloaded to a DSP platform resembling miniDSP or Powersoft’s Armonia Plus.
Clearly, Crosslite+ is a really highly effective software program for the event of DSP crossovers for powered loudspeakers. Priced at $500, Crosslite+ is obtainable on-line from F.MonteiroScience. VC
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This text was initially printed in Voice Coil, December 2021.
