In addition to the features offered in Basis plus room correction, this implementation provides DEQX’s uniquely powerful Speaker Correction. DEQX Calibrated™ speaker correction corrects the frequency-response and time-domain group-delay errors in fine detail, essentially at thousands of frequencies. This implementation corrects your speakers using their existing crossovers, and does not require ‘going ‘active’. Connection to other components in your system is the same as BASIC.

DEQX Calibrated™ Speaker Correction involves measuring the speaker using a pseudo-anechoic measurement technique whereby the software minimizes, or eliminates, the effects of sound reflecting back from the room. This is necessary in order to measure and correct the speaker’s native time and frequency domain performance before the measurement is corrupted by room reverberation. ‘Room Correction’ requires far less detailed correction than DEQX Calibrated™ speaker correction.

When measuring a speaker, the microphone is placed one to two meters on-axis to the speaker (further for larger speakers). The measurement produces an impulse response display whereby time (in milliseconds) moves to the right and amplitude is shown vertically. The initial ‘impulse’ at the left represents the signal generated by the speaker and its first reflection comes from the nearest room surface, usually the floor (sound travels about 1 foot per millisecond). By positioning the Impulse Truncation Cursor the time-domain correction can include or ignore varying degrees of room reflections.

With measurements complete, you simply specify the frequency range that you wish to correct and the software automatically creates the perfect phase and frequency response correction filters for your speakers. The DEQX Calibration software is easy to use. Its graphical user interface and "wizard" assisted operation provides default suggestions, but also gives you complete control over the correction parameters applied to your speakers.