SpicyTL is a simulation model, based on the electrical circuit theory, which predicts the electro-acoustic behavior of transmission line loaded loudspeaker systems. It is the evolution of the AIRDAMP model, whose development, and the principles that allow its operation, is illustrated in the article Progettare una linea di trasmissione utilizzando SPICE (Designing a Transmission Line with SPICE), published in issues 408, 409 and 410 (April, May and June 2019) of AUDIOreview. Compared to the latter, SpicyTL has a modular structure composed of several acoustic “blocks” and is able to simulate also tapered and expanding TL’s.
The acoustic connections between the various blocks are made on a horizontal line while amplifier and loudspeaker are connected vertically.
The model, particularly suitable to design TL damped with polyurethane foam, allows to simulate frequency response, phase response, group delay, electrical impedance, speaker cone excursion and air velocity at the TL output.
The circuit simulation program used is Linear Technology’s LTspice.
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