Xoro HXS 532 - Инструкция (Страница 24)

23
ADDENDUM
SOUND GLOSSARY
PORTED ENCLOSURE
POWER
POWER AMPLIFIER
PRE-AMPLIFIER
CONNECTOR
ECEIVER
ESISTANCE
ESONANT FREQUENCY
A type of speaker enclosure that uses a duct or
port to improve efficiency at low frequencies.
In electricity, power (P) is the product of the voltage
(V) and the current (I). i.e. P=VI. The unit of power
is the Watt.
An amplifier without tone controls and with a higher
power output than a line amplifier or pre-amp.
Commonly used to drive loudspeakers.
Or Pre-amp is a device that takes a source signal,
such as from a turntable, tape-deck or CD player,
and passes this signal on to a power-amplifier(s).
The pre-amp may have a number of controls such
as source selector switches, balance, volume and
possibly tone-controls.
"Phono" plugs, used primarily as low-level
connections between Phonographs/CD
players/Tuners/Recievers/Amplifiers
An audio component that combines a pre-amplifier,
amplifier(s) and tuner in one chassis.
In electrical or electronic circuits, a characteristic of
a material that opposes the flow of electrons.
Speakers have resistance that opposes current.
Any system has a resonance at some particular
frequency. At that frequency, even a slight amount
of energy can cause the system to vibrate. A
stretched piano string, when plucked, will vibrate
for a while at a certain fundamental frequency.
Plucked again, it will again vibrate at that same
frequency. This is its natural or resonant frequency.
While this is the basis of musical instruments, it is
undesirable in music-reproducing instruments like
audio equipment.
The square root of the mean of the sum of the
squares. Commonly used as the effective value of
measuring a sine wave's electrical power. A
standard in amplifier measurements. it is a more
realistic measure than 'peak' power or 'peak-to-
peak' power.
RCA
R
R (Re)
R
RMS (root-mean-square)
R (cut-off)
S
S
S
S (SN)
S P L (Spl)
OLL-OFF
ATELLITE
EALED ENCLOSURE
ENSITIVITY
IGNAL-TO-NOISE RATIO
OUND RESSURE EVEL
SOUNDSTAGE
SOUND WAVES
The attenuation that occurs at the lower or upper
frequency range of a driver, network, or system. The
roll-off frequency is usually defined as the frequency
where response is reduced by -3 dB.
A satellite speaker is usually fairly small, and does not
reproduce the lowest frequencies. Usually meant to
be used with a subwoofer.
An air tight enclosure that completely isolates the
back wave of the driver from the front. Very tight,
defined sound (with Qtc = 0.707) with very good
transient response and power handling.
A measurement of how much power is required for a
loudspeaker to achieve a certain output level. The
general standard used is on-axis SPL (Sound
Pressure Level) at 1 watt input, 1 meter distance.
The range or distance between the noise floor (the
noise level of the equipment itself) and the music
signal.
Given in decibels (DB) is an expression of loudness
or volume. A 10db increase in SPL represents a
doubling in volume. Live orchestral music reaches
brief peaks in the 105db range and live rock easily
goes over 120db.
A listening term refers to the placement of a stereo
image in a fashion that replicates the original
performance. A realistic soundstage has proportional
width, depth and height.
Sound waves can be thought of like the waves in
water. Frequency determines the length of the waves;
amplitude or volume determines the height of the
waves. At 20Hz, the wavelength is 56 feet long!
These long waves give bass its penetrating ability,
(why you can hear car boomers blocks away).
A buildup of sound level at a particular frequency that
is dependent upon the dimensions of a resonant
room, car interior, or enclosure. It occurs when the
rate of energy loss equals the rate of energy input into
the system. This is what you hear when you listen into
a sea shell.
STANDING WAVE