A MATTER OF TIME

摘要

Keith Howard's review of the Green Mountain Eos speakers [HFN April '10] mentioned the importance of time alignment in multiple speaker systems. The 'normal' practice of mounting the tweeter in line with the mounting flanges of the lower frequency drivers adversely affects the transient response because the sound from the tweeter has a shorter distance to travel. This would cause a dip in the frequency response around the crossover frequency if designers didn't compensate by reversing the connections to the tweeter, thus allowing the sound from the two units to arrive in phase. This, however, only works for continuous waves, transients being incorrectly low in power.