Dbx 3bX digital series Manuale Utente

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December 2009
23
Spotlight
Active Loudspeakers and
DSP: A Simplified Path to
Perfection
By Steve Mowry
I
n the vast majority of loudspeakers, the low-level output
signal from a CD or DVD player is the input to a receiver
or preamplifier (control center), with the output from the pre-
amplifier being the input to the power amplifier(s), ~1.0V. In
these cases, each loudspeaker is connected to the power ampli-
fier’s output terminals using a single pair of cables.” However,
between the power amplifier and the audio transducers, there
is a passive RLC network. The power amplifier sees the RLC
network and the audio transducers (Fig . 1).
To implement a reasonable crossover and any equaliza-
tion or impedance compensation is a difficult task, to say
the least, that usually becomes an empirical process (build
and try) at some point. Degradation and variability of the
high-level audio signal is simply unavoidable. One alternative
is a full-range audio transducer that eliminates the need for
a crossover network but not for equalization or impedance
compensation.
ACTIVE LOUDSPEAKERS
Another alternative is active loudspeakers. In these cases,
multiple power amplifiers are used and the crossover(s) and
equalization are implemented electronically at low-level and
typically between the preamplifier and the power ampli-
fier with regard to the audio signal path. This is sometimes
referred to as “bi-amp or tri-ampfor active two-way and
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AIR MOTION TRANSFORMER
FIGURE 1: Block diagrams of passive (upper) and active (lower)
loudspeakers.
VC1209.indd 23 11/12/2009 3:39:00 PM
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Sommario

Pagina 1 - OF MUSIC

December 200923SpotlightActive Loudspeakers and DSP: A Simplified Path to PerfectionBy Steve Mowry In the vast majority of loudspeakers, the low

Pagina 2

December 200935family PC as a powerful but easy-to-use signal processor including effects and, along with the Internet, as a source of program

Pagina 3 - Movers and Shakers

December 200937tion in IM and THD at the root cause, the transducers’ motors and suspensions.If readers have questions, concerns, interests, or com-me

Pagina 4

26 voice coilthree-way loudspeakers, respectively. The power amplifiers are connected directly to the loudspeakers, again using cables but in multiple

Pagina 5 - Microphones

28 voice coilactive loudspeakers).Active loudspeakers facilitate enclosure design and align-ments that consider the electromechanical and

Pagina 6 - D-PRO SOFTWARE

December 200929and hardware DSP boards with A/D and D/A on board. The following DIGMODA models with the respective ICEpower modules are available (htt

Pagina 7

30 voice coilthat wish to use their own amplifier designs.A company can literally “almost catch up” with Meridian by implementing DIGMODA into ne

Pagina 8 - Responsibility

December 200931thus improve product reliability.The typical audio specifications of the DIGMODA DDC-552 are as follows: Dimensions of the

Pagina 9 - DIGITAL EDITION

32 voice coilFTP server. Once D-Pro is installed (Windows XP recom-mended), you connect the PC to DIGMODA with a common USB printer like inter

Pagina 10 - December 2009

December 2009333 = BandPass4 = All-Pass5 = Parametric EQ (peak or notch)6 = Bass Shelf7 = Treble ShelfThen either enter gain, frequency, and Q or use

Pagina 11

34 voice coilrelative levels of transducer input signals. Figure 11 shows an interesting screen that reminds me of the old DBX 3BX dynamic r

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