Madrigal Imaging power amplifier ユーザーズマニュアル
14
ances of AC mains line and neutral), as well as from the total elimination of AC
mains fluctuations and noise. As a result, the critical voltage gain stages of the
Nº33 operate in a highly optimized environment, and are able to pass along sig-
nificantly more low-level resolution and detail in the musical signal that they am-
plify.
mains fluctuations and noise. As a result, the critical voltage gain stages of the
Nº33 operate in a highly optimized environment, and are able to pass along sig-
nificantly more low-level resolution and detail in the musical signal that they am-
plify.
Fully balanced design
A truly balanced input topology eliminates the need for an input buffer amplifica-
tion stage and allows the first stage differential amplifier to be driven directly by
the source. Matched impedances are presented to the source and both signals
travel through identical circuit paths. Voltage gain is implemented on a cyanate
ester circuit board for superior sonic performance and consistency.
tion stage and allows the first stage differential amplifier to be driven directly by
the source. Matched impedances are presented to the source and both signals
travel through identical circuit paths. Voltage gain is implemented on a cyanate
ester circuit board for superior sonic performance and consistency.
Painstaking attention to layout of the amplifier was essential to minimize mag-
netic field distortions possible with such a massive power delivery system, includ-
ing careful mirror-imaging of circuits to cancel magnetic fields. Balanced output is
accomplished through the use of two identical amplifiers. A balanced input signal
remains balanced throughout the Nº33. Rejection of common mode noise and
distortion is obtained when the two halves finally meet: in the loudspeaker’s
voice coil.
netic field distortions possible with such a massive power delivery system, includ-
ing careful mirror-imaging of circuits to cancel magnetic fields. Balanced output is
accomplished through the use of two identical amplifiers. A balanced input signal
remains balanced throughout the Nº33. Rejection of common mode noise and
distortion is obtained when the two halves finally meet: in the loudspeaker’s
voice coil.
True Voltage Source
The Nº33 power amplifier operates as a virtually perfect textbook case of a “volt-
age source.” This is to say that the Nº33 will maintain whatever the appropriate
voltage might be at any moment (given the demands of the music) without any
particular regard for the current demands of the loudspeaker. Whether the loud-
speaker requires one amp or one hundred amps of current at that instant, the
Nº33 will deliver it.
age source.” This is to say that the Nº33 will maintain whatever the appropriate
voltage might be at any moment (given the demands of the music) without any
particular regard for the current demands of the loudspeaker. Whether the loud-
speaker requires one amp or one hundred amps of current at that instant, the
Nº33 will deliver it.
Because of this “voltage source” characteristic, the Nº33 doubles its power output
every time the loudspeaker impedance is cut by half. Its continuous rated power
is 300 watts at 8
every time the loudspeaker impedance is cut by half. Its continuous rated power
is 300 watts at 8
Ω
; 600 watts at 4
Ω
; 1200 watts at 2
Ω
; and 2400 watts at 1
Ω
—
assuming the electrical circuit in the wall can support these extraordinary power
levels. A 1
levels. A 1
Ω
test at continuous maximum power requires about 62 amperes at
120V and 31 amperes at 240V. (The laws of physics refuse to be cheated. Long-
term, you cannot deliver more power into the speaker than you can pull from the
wall.)
term, you cannot deliver more power into the speaker than you can pull from the
wall.)
Sixty TO-3 output transistors are distributed in the four main heatsinks of each
Nº33 to conduct and control the flow of its prodigious power capabilities to the
loudspeaker. There are fifteen complementary pairs of output transistors in each
of two output stages (inverting and non-inverting) within each amplifier.
Nº33 to conduct and control the flow of its prodigious power capabilities to the
loudspeaker. There are fifteen complementary pairs of output transistors in each
of two output stages (inverting and non-inverting) within each amplifier.
No known loudspeaker can absorb the continuous full power capability of the
Nº33. (Nor would you want to be present in the room were you to find one that
could do so.) However, many high quality loudspeakers may require these rather
extreme power levels on a short term basis when reproducing music at realistic
levels. The Nº33 can answer these needs with impunity, without any power sup-
ply “sag” and without altering its sonic performance in any way. Its resultant im-
perturbable nature is reflected in the authority and control with which it repro-
duces music.
Nº33. (Nor would you want to be present in the room were you to find one that
could do so.) However, many high quality loudspeakers may require these rather
extreme power levels on a short term basis when reproducing music at realistic
levels. The Nº33 can answer these needs with impunity, without any power sup-
ply “sag” and without altering its sonic performance in any way. Its resultant im-
perturbable nature is reflected in the authority and control with which it repro-
duces music.
Extensive Protection
Your Nº33 power amplifiers will shut themselves down if they sense any of a
number of fault conditions which could cause damage to either themselves or to
your loudspeakers. These fault conditions include
number of fault conditions which could cause damage to either themselves or to
your loudspeakers. These fault conditions include