Acoustic Induction

Impulse Test Results.

Don’t forget, Alacrity Audio’s Acoustic Induction promotes the production of a Standing Resonant Wave, not at their own Resonant Frequency because they do not have one, but at EVERY frequency and complex wave-form with which they are driven, a previously demonstrated unattainable state for any enclosed or vented volume of air.

Fascinating results from our Caterthun6 loudspeaker.

caterthun 6.5 square wave

Look at that impulse plot, and just LOOK how tight the bass-unit is with the tweeter.

Not only is the phase in alignment, but neither crossovers nor cabinet are unduly holding or sustaining energy. This is just one of the reasons our loudspeakers sound so clear.

New Test Results!

As part of our ongoing commitment to openness and quality, we here at Alacrity Audio never rest. See below for the latest test results showing the effectiveness of our unique technology, Acoustic Induction.

Caterthun 6 Impedance Curve.

caterthunCimpThese remarkable plots show two very important things. Firstly, that mid-range clarity that everyone keeps talking about. As you can see from the graphs, both the Caterthun 6 and the Caterthun 8 loudspeakers are INCREDIBLY smooth through the important vocal mid-band. I would go as far as to say that from 500 Hz to 5 KHz, I have never seen so smooth a response. The Acoustic Induction system has worked MAGIC in this area. It makes them act like they are single-way loudspeakers across the whole vocal range! Stereo imagery is enhanced, sibilance reduced and ‘presence’ can be experienced in full as mid-range phase-distortions are reduced to vanishingly low levels.

Caterthun 8 Impedance Curve.

caterthun8impSecondly, that bass response. As you can see, both cabinets experience an ‘event’ at just below 100 Hz; a big one in the case of the Caterthun 6s (double that of it’s natural resonant frequency), but a MASSIVE one in the case of the Caterthun 8s (almost SIX TIMES that of it’s natural resonant frequency). This is where our Acoustic Induction cabinet loading technology takes over from the bass units completely, converting the energy into a standing wave that does not permit the bass units to significantly move, while at the same time physically out-performing the bass units to which it is coupled.

The cabinet loading technique is so effective that both systems now electrically resemble a completely different design, eg a small full-range loudspeaker with a 100 Hz, 36 dB per octave, passive-crossover sub-bass back-up, but without all the problems associated with such a set-up (loss of sensitivity, cost and component-count, etc).

These huge electrical improvements shine through as huge acoustic improvements. One day, people will ask, “Why weren’t all loudspeakers made this way?”

Alacrity Audio’s Acoustic Induction cabinet-loading technology.

An acoustic inductor should enable the production of a standing wave (or an acoustic “back-EMF”) at almost every frequency at which it is driven.

This means you should get a stable and highly accurate output in almost ANY room, as the cabinet should be reacting consistently across it’s audio spectrum.


Alacrity Audio’s Acoustic Induction system does exactly that. It also produces helpful side-effects. One of these is that the excursion of the bass unit is retarded linearly at all operating frequencies without harming output efficiency. This in turn flattens the impedance curve (see above) and allows the amplifier to exert greater control at deep-bass frequencies with less confusion in the mid-range ones. Even at high levels (over 103 dB), the bass unit does not exceed it’s linear excursion range.

Another side-effect is a phase-shift that helps to correct phase-shift distortions produced by cross-over electronics and non time-aligned drive-units, allowing the bass output phase to match the tweeter at crossover frequencies (as seen in the latest test results at the top of this page).

In combination, Acoustic Induction just releases the music. The result? Stunning audio.

More about Acoustic Induction…

More about The Caterthuns

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