Why is time alignment critical for ribbon systems?
With first-order crossovers the drivers overlap over a wide band, so any time error between sections sums as phase error — smearing transients and altering tonal balance.
Because Clarisys uses first-order (6 dB/oct) crossovers, the drivers overlap substantially in the frequency domain — there is no steep brick-wall handoff between sections. This means the acoustic output of two adjacent ribbon sections is summed over a wide band. If the two sections are not time-aligned, their sum will contain phase errors that smear transients and alter the tonal balance through the crossover region.
What time alignment means
The acoustic centres of the ribbon sections must be equidistant from the listener, so that a signal crossing the crossover point arrives from both sections at the same instant. When this is achieved, the two sections add constructively and the waveform is preserved; when it is not, they add with a phase offset and the waveform is distorted.
What you hear
- Coherent transients. A percussion attack or a plucked string arrives as a single event, not a smeared sequence of driver arrivals.
- Holographic imaging. Because the time structure of the waveform is intact, the ear can locate each image precisely in space — this is the foundation of the "holographic" staging ribbon systems are known for.
- Correct tonal balance. Phase errors through the crossover region change the summed amplitude response, so a misaligned speaker measures (and sounds) tonally off even if each driver is flat on its own.
In the active Atrium System, all modules are aligned to within 0.1 ms of in-room response — a tolerance that is essentially the acoustic time-of-flight across a few centimetres.