2-EN
A groundbreaking high point in the evolution of mobile
installation was reached with the onset of automated sys-
tem tuning. This high level of installation technique can
now be easily achieved by the touch of a button.
■ Accurate sound focus and alignment is now possible with the touch of a button:
“Precision Automated Time Correction”
This function uses “TSP” (Time Stretched Pulse) technology, which is normally used for designing
music halls and sound field analysis, to accurately measure phase shifts automatically with greater
precision than other methods. “Auto Time Correction” adjusts the sound from every speaker
(including subwoofers and tweeters) so that it reaches the optimum listening point simultaneously.
The result is an ultra high level of precision sound and focus by the simple touch of a button.
■ The sound field inside the passenger compartment can be analyzed and adjusted in
1/3 octave increments: “175 Band digital 1/3 Octave Equalizer & Analyzer”
The sound field characteristics of the passenger compartment are displayed in 31 bands with superb
accuracy. Every one of the 11 channels can be analyzed with the built-in RTA (Real Time Analyzer),
either individually or in combination with other channels. Then, every corner of the car (L/R front,
center, L/R rear, L/R subwoofers) can be 1/3 octave equalized! Or, if you prefer, parametric equaliza-
tion can be engaged instead. This will allow you to perform sound field adjustment to a degree
previously not available in a vehicle. For greater convenience it is also possible to check the measured
values in detail on a PC, and adjust the settings from the keyboard.
■ High-Precision compensation of SPL & phase characteristics and reflected sound
waves: “Adaptive Equalizer”
Conventional equalizers adjust the AMOUNT of sound, or SPL, arriving at the listener. However, they
are unable to modify the timing or phase of these signals. Even if the 1/3-octave equalizations
“flatten” the response in an SPL sense, reflections inside the vehicle distort the original sound arrival
times compared to the actual recording. To address this problem, Alpine developed a completely new
cabin correction technology, which we call “Adaptive Equalizer.”
The Adaptive EQ begins by measuring both magnitude (SPL) and time (phase) in the cabin. Then, the
Adaptive EQ calculates a correction factor to pre-compensate for low frequency SPL and phase errors
caused by reflections in the vehicle. Upon music playback, the Adaptive EQ recalculates every single
digital sample using the calculated correction factor. From the lowest bass frequencies up into the
lower midrange, the sound will be smoother and exhibit more depth.
This is well beyond the capability of a graphic or parametric equalizer.
Multimedia Manager™
