Sound of guitars
For an electric
guitar the amplifier and the acoustic enclosure have the same function that the
body of an acoustic guitar ( that forms a resonant box
) .
Amplifier and
enclosure for bass guitar
increase basses sounds
while comprising a hump in the band pass to give body to the sound .
An amplifier for
electric guitar decreases a lot basses and increases a lot trebles
corresponding to this instrument .
The enclosure for
electric guitar does not render a lot basses and has a hump of resonance at
2000 to 3000 Hz to give a clear sound .
Enclosures for the
two types of guitar do not render the extreme trebles , except bass enclosures with treble speaker .
An important point
is the output of speakers (expressed in decibels) .
+3dB means acoustic power multiplied by two .
An
amplifier of 30 watts
with an enclosure of output 96 dB has the same sounding level
that an amplifier of 60 watts with an enclosure of output 93 dB .
What
counts for an amplifier is the continuous efficient power ( true RMS ) . Improper names
: musical power
, admissible , maximum , PMPO .
When there are
several identical speakers in an instrument ‘s
enclosure , it becomes more directive ( it projects sounds in front of
enclosure ) .
The impedance ( between 4 and 16 ohms ) and the power ( in watts ) of
acoustic enclosures are not very precise values but rather reference values .
The microphone of
an electric guitar is constituted with a magnet surrounded by a coil of
wire. If there are two coils the
microphone takes less magnetic radiations .
A microphone with
a simple coil has a low electric level , renders less basses . It has a more dry sound ,
more net , more elementary .
A microphone with
double coils has a electric level stronger, renders more basses
. It has a sound with body and
some harmonics .
The major problem
with electric guitars , without internal electronics ,
is that we can not connect them with a long wire . The problem is again worse with volume on middle .
This problem can involve high
frequencies loss , perhaps hum is present . It is better
to always leave the volume button to the maximum.
