The 2nd version of APL TDA Real Time program released

Overlays and microphone correction are added. Some minor bugs are corrected.
Take a look on these examples of tuning of Linear Phase crossover
and our usual Minimum Phase crossover.
Let`s tune a crossover in 3 minutes with confidence!
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APL TDA with Intermodulation Distortion Testing

Have you ever experienced a speaker that measured good but sounded bad? Intermodulation distortion could be one of the reasons for this. Intermodulation distortion testing is necessary because IMD is both more audible and objectionable than low order harmonic distortion.  Even when levels of THD are acceptably low, IMD can be problematic, e.g. due to Doppler effects.

APL has now made full spectrum IMD testing available in APL TDA IM making it a complete tool for loudspeaker evaluation and tuning. The new tool provides all the features of TDA in addition to the IMD tests. Intermodulation distortion test sweeps can be done with two tones close together in frequency, to potentially spread distortion products across the entire audible spectrum, or with a fixed LF tone to provide cone motion stress during the sweep. The signal levels of primary distortion products are captured during the sweep and displayed as frequency responses. Performing IM tests ensure, that if IM is a problem anywhere in the audible spectrum, it will be found.

Read more about TDA IM



Our Mission

APL is all about getting the truest sound from your speakers. Even the best speakers and headphones introduce their own specific characteristics into playback, giving you a less-than-accurate reproduction of the original audio source.  However, with APL’s range of products, you can achieve the most accurate sound playback in all environments – studio, live audio, or car – with relatively little expertise or expense.  Please feel free to explore the range of APL products and dig into the technological side of our world renowned hardware and software. The new era of sound is here!

About APL Audio

Renowned sound engineer Raimonds Skuruls is the founder and owner of Acoustic Power Lab Ltd. He spent three years developing a new loudspeaker frequency characteristics correction technology that was awarded an initial patent in 2005, and now has patent coverage in the U.S., Canada, Russia, and other countries. The technology was awarded an Excellence prize at AES 2007 in New York, and Pro Sound News Europe deems SPFR (sound/acoustic power frequency response) correction technology as one of the leading innovations in the field.

In 2010, Skuruls developed an alternative frequency characteristics correction technology for car audio systems. The car equipped with that solution earned the Best Sound Award at the Salzburg EMMA European final competition in March of 2013.