Xoro HXS 532 - Инструкция (Страница 23)

22
ADDENDUM
SOUND GLOSSARY
by electrical changes. Technically the unexpected
(and unwanted) phase shift of digital pulses over a
transmission medium. A discrepancy between
when a digital edge transition is supposed to occur
and when it actually does occur - think of it as
nervous digital, or maybe a digital analogy to wow
and flutter.
One thousand hertz.
A signal whose voltage is between approximately
0.310 olts and 10 olts across a load of 600
ohms or greater.
A circuit that allows low frequencies to pass but
rolls off the high frequencies. Most subwoofers
have low-pass filters built in and many surround
sound decoders have subwoofer outputs that have
been low-pass filtered.
Perceived volume. Loudness can be deceiving. For
example, adding distortion will make a given
volume level seem louder than it actually is.
A meaningless specification.
Mid frequency bass, usually frequencies just above
the sub-bass range, from around 100
400 Hz or
so
A speaker (driver), used to reproduce the middle
range of frequencies. A midrange is combined with
a woofer for low frequencies and a tweeter for high
frequencies to form a complete, full-range system.
What goes into a system comes out changed by its
passage through that system-in other words,
distorted. The ideal of an audio component and an
audio system is to be linear, or no distorting, with
the image on one side of the mirror identical to the
image on the other side.
An octave is a doubling or halving of frequency.
20Hz-40Hz is often considered the bottom octave.
Each octave you add on the bottom requires that
your speakers move four times as much air!
KILOHERTZ )
LINE LEVEL
LOW-PASS FILTER
LOUDNESS
MAXIMUM POWER RATING
MIDBASS
MIDRANGE
NONLINEARITY
OCTAVE
(kHz
V V
~
OHM ( )
OUT OF PHASE
OVERLOAD
PASSIVE RADIATOR
PEAK
PEAK POWER RATING
PEAK POWER
PEAK-TO-PEAK POWER
PHASE COHERENCE
PHASE DISTORTION
POINT-SOURCE
Ohm
A unit of electrical resistance or impedance.
When speakers are mounted in reverse polarity, i.e.,
one speaker is wired +/+ and -/- from the amp and the
other is wired +/-.
A condition in which a system is given too high of an
input level. A common cause of distortion or product
failure.
A device that looks just like an ordinary driver, except
it has no magnet or voice coil. A passive radiator is
usually a highly compliant device, with a similar cone
material and surround found on regular active drivers.
The radiator must usually be at least as large (or
larger) than the driver it is aligned with. The passive
radiator is tuned to Fb and used in place of a port.
The maximum amplitude of a voltage or current.
Another meaningless specification unless references
are given.
A measure of amplifier power based on the amplitude
rise above ground plane or 0 volts.
A measure of amplifier power based on the total
amplitude between peak positive value and peak
negative value. Generally this value is twice the peak
value for a symmetrical waveform.
The relationship and timing of sounds that come from
different drivers (subs, mids, tweets) mounted in
different locations.
A type of audible distortion caused by time delay
between various parts of the signal.
Most multi-unit loudspeakers try to approximate a
point-source. Think of a pebble dropped into the
water and the expanding wave pattern away from
impact. Obviously it is difficult to integrate multiple
point-sources into a truly coherent expanding wave.
The best designs do quite well with careful driver
engineering and crossover development.