AAC-48L – Enewave

Overview

The first spatial acoustics automatic calibrator combines space acoustics and electroacoustic systems. It can optimize your acoustic environment, calibrate the frequency response of the audio system and the acoustic space, and perfectly display sound details to create an ideal acoustic space for you. Using FPGA-based large scales real-time FIR acoustic phase calibration system, breaking the digital audio algorithm technology and delay through the restraint of delay, the essence of sound is perfectly reproduced through the three-dimensional standards of sampling accuracy, sampling frequency, and phase accuracy.

Features

Multi-device synchronization
High dynamic output
Built-in detection microphone input interface
Support multi-point measurement to calculate the average value
Free design of acoustic space frequency response
Automatic phase calibration
Compatible with two sets of AAC processor parallel connecting dual-channel high-order FIR filtering at the same time
Able to display on the computer software about the frequency response, impulse, phase curve after measurement in the acoustic space.
Reflection elimination processing tool that does not change the sound quality of the original speaker
Time processing tool that can gather energy for direct sound
Flexible matrix output options
Each output has sampling rate grade accurate delay and amplitude control function

Description

AAC aims to improve the clarity of the sound image and restore the transparency of the sound, thereby optimizing your acoustic environment. The system provides a variety of interfaces, exquisite design, it is simple to use, and can meet the needs of small to large-scale sound field measurement and calibration requirements for various listening environments such as confer- ence rooms, lecture halls, theaters, auditoriums, and large-scale live performances, to achieve more transparent and high-res- olution of high-frequency performance and more clean & powerful bass.

AAC built-in up to 4*4096 steps FIR filter function, realizes the phase and frequency control of the full frequency band of 12Hz~20KHz, and has powerful calibration capabilities.

With automatic calibration of the acoustic spatial frequency response, after the equipment sends out the test signal, the unprocessed frequency response curve can be picked up and reflected in the software, and the equipment is automatically calibrated. After completion, you can see from the software interface that the completed frequency response curve is very smooth, the comparison before and after optimization is obvious, and the optimization effect is significant.

The equipment has an automatic phase calibration function. After the equipment is automatically calibrated, you can see the comparison of the front and back phases through the acoustic measurement software (such as Smaart software).

The calibration function has obvious phase optimization;

The device has an automatic loudness optimization and enhancement function. After the device is automatically calibrated, you can compare the loudness before and after the calibration function is turned on or off from the sense of hearing. Turning on the calibration function can significantly improve the loudness optimization.

Applications

The traditional acoustic space problem solving method is quite complicated, the engineers of system engineering need to use different measurement and processing tools to solve different problems.

For example, the placement of multiple sub-woofers in the room, through multiple measurements, adjust place the position, set different delay time, so that the sub- woofers can be played sound in the same phase.

At the same time, the time relationship between the subwoofers and the full-range frequency loudspeakers must be taken into consideration. Such a complicated setting often cares about one and loses the other, unable to get a relatively correct result.

At the same time, the room and loudspeakers need to take into account not only the bass, but also the room standing wave that occurs in the mid/low frequency range, the crossover phase distortion in the mid range, and the early reflection of high frequencies in the room, which makes the system engineer physically and mentally exhausted. The unique algorithm of the AAC system only needs to perform microphone measurements on one point in the room or multiple points in a large space, and the time for each measurement point only needs three seconds, which has a great tolerance for noise in the space. Then the algorithm will take more than ten seconds to find the phase problem in the system, and automatically send the processing parameters of the problem to the FPGA. In this series of process- es, no human intervention is required, just put on the measurement microphone and press the AAC software measurement button.

The system engineer can finally get a calibrated standard acoustic space in 10 seconds. In this space, there is no lack of bass caused by the sound cancellation of multiple sub-woof ers, no low-frequency resonance, and no annoying feedback whistling. If you have your own ideal frequency response curve, you can even design the overall style of music frequency response through AAC’s frequency response curve design.

Recommended applications

Concert Hall
Theater/Theater
Live sound reinforcement/ Roadshow
Music Bar/Club
Function Room
Meeting room
Lecture Hall

Technical Specifications

Analog input	4 x XLR (left and right channel) + 24 dBu max
Analog output	4 x XLR (left and right channels)
	Two of the channels can be assigned as Aux channel + 24dBu max
Digital input	1 x AES/EBU@75 Ohms
input	1x Input@75Ohms 3Vpp on BNC 32Hz-192KHz
output	1x Input@75Ohms 3Vpp on BNC 32Hz-192KHz
A/D converter	Dynamic range 120dB THD+N：-107dB
D/A converter	Dynamic range 120dB THD+N：-110dB
Dimesion	225mm×636mm×440mm(H×W×D)
Total system delay 0.25ms

Dimension and diagram

Unit : mm