Carvin Professional Instruction Manual - Page 2

Kick Drum Test, Amplifier Class

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KICK DRUM TEST The kick drum test will demonstrate in Chart #3 that the typical lightweight amp will deliver its full power for the 1st kick of 20mSec. However, when the 2nd kick comes there is sag in the voltage / current, and the amp cannot reproduce the full kick. The reason is these switching supplies are not built to "linear power" specifications and their voltages / current sags. Generally these lightweight amps cost less to build because of smaller capacitors, fewer output devices and smaller heat sinks. For the most part these typical lightweight amps satisfy the light users, but not the pros who have used these amps and hear the lacking bottom-end at high power levels. If you look at Chart #2, you'll see the Carvin DCML power amps maintain their reserve voltage/current to faithfully reproduce Chart #1 delivering the full 2nd beat of the original kick drum signal. This demonstrates the DCML high damping factor for instantaneous voltage/current. The Carvin SwitchMode Technology™ power supplies are not only designed for 100% "ondemand" voltage / current of a linear power supply but they also feature autoswitching from 120V 60 Hz to 240V 50 Hz. AMPLIFIER CLASS 1) CLASS A/B is a conventional linear amplifier. It could be tubes, FETS (field effect transistor), or bi-polar transistors it's all the same CLASS A/B. In more technical terms, a CLASS B amp does not draw current until there is a signal. The problem with CLASS B is that distortion can be introduced during the time when the output voltage crosses zero. CLASS A draws current continuously even if there is no signal - a huge power supply is required and it runs hot. The combination of CLASS A/B eliminates the distortion of CLASS B by the help of the CLASS A idle current. DCM MODELS: DCM1540L, DCM2000L 2) CLASS A/B TRACKING is identical to the CLASS A/B amplifier in the original DCM series but how the high voltage is applied to the amplifier is different. This design introduces a third section that interfaces the power supply to the amplifier. The voltage from the power supply is adjusting to what is needed to produce the output wattage demanded by the input of the amplifier. This section keeps the high voltage very low on the amplifier until it sees a need to raise it up. The voltage tracks the input signal and the rail voltage is adjusted as necessary, which is why it's called CLASS A/B TRACKING. The primary advantage is to use less power, thus removing heat from the chassis. BASS AMPS: B2000 DCM MODELS: DCM3000L, DCM3800L

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KICK DRUM TEST
The kick drum test will demonstrate in Chart #3 that
the typical lightweight amp will deliver its full
power for the 1st kick of 20mSec. However, when
the 2nd kick comes there is sag in the voltage /
current, and the amp cannot reproduce the full kick.
The reason is these switching supplies are not built
to "linear power" specifications and their voltages /
current sags. Generally these lightweight amps cost
less to build because of smaller capacitors, fewer
output devices and smaller heat sinks. For the most
part these typical lightweight amps satisfy the light
users, but not the pros who have used these amps
and hear the lacking bottom-end at high power
levels.
If you look at Chart #2, you'll see the Carvin DCML
power amps maintain their reserve voltage/current to
faithfully reproduce Chart #1 delivering the full 2nd
beat of the original kick drum signal. This demonstrates the DCML high damping factor for instantaneous
voltage/current. The Carvin SwitchMode Technology™ power supplies are not only designed for 100% "on-
demand" voltage / current of a linear power supply but they also feature autoswitching from 120V 60 Hz to
240V 50 Hz.
AMPLIFIER CLASS
1) CLASS A/B is a conventional linear amplifier. It could be tubes, FETS (field effect transistor), or bi-polar
transistors it's all the same CLASS A/B. In more technical terms, a CLASS B amp does not draw current until
there is a signal. The problem with CLASS B is that distortion can be introduced during the time when the
output voltage crosses zero. CLASS A draws current continuously even if there is no signal - a huge power
supply is required and it runs hot. The combination of CLASS A/B eliminates the distortion of CLASS B by the
help of the CLASS A idle current.
DCM MODELS:
DCM1540L
,
DCM2000L
2) CLASS A/B TRACKING is identical to the CLASS A/B amplifier in the original DCM series but how the
high voltage is applied to the amplifier is different. This design introduces a third section that interfaces the
power supply to the amplifier. The voltage from the power supply is adjusting to what is needed to produce the
output wattage demanded by the input of the amplifier. This section keeps the high voltage very low on the
amplifier until it sees a need to raise it up. The voltage tracks the input signal and the rail voltage is adjusted as
necessary, which is why it's called CLASS A/B TRACKING. The primary advantage is to use less power, thus
removing heat from the chassis.
BASS AMPS:
B2000
DCM MODELS:
DCM3000L
,
DCM3800L