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Cubes
Some examples of cubes - real-live measurements from
real-live amplifiers.
First we look at three examples which describes three basic
shapes of the PowerCube measurements, and then we look at three
well known brands... and we're not disclosing any names except
one...
The perfect amplifier doesn't care about the load - it's a
pure voltage generator - so the measurement of a theoretically
ideal amp would produce a cube, hence the name "PowerCube".
In popular price ranges you can't really expect to find an
amplifier that will produce a perfect cube, you can see a good
example in the last cube on this page - a very well designed two
channel amp from Rotel. Of course, good Class D amplifiers do
exist, just as with any other topology, but you need a PowerCube
system to find them!
If you pay top dollars, you can come very close to a
perfect cube.
This is the best cube ever. The Rockford Fosgate T15kW
amplifier uses HT Technology which gives the amplifier unmatched
dynamic power capabilities.
The cube is near perfect, but expect to pay USD 20,000!
Here are some more examples: |
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Good example
Regardless of the load, this amplifier can produce
an almost equal voltage without clipping. Although you'll see
some small losses when the load decreases, this amplifier will
handle any loudspeaker. |
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Poor Power Supply
In this example the output voltage is dramatically reduced
into lower impedances. This amp will
definitely not handle a real-world loudspeaker very well. |
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Current limiting
This amplifier works into 8, 4 and 2 ohm resistive loads, but
any reactive load will trigger the protection circuits and shut
down the amplifier!
This amp is essentially incapable of driving a real-world
loudspeaker. |
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Class D.
Well known brand
Home theatre receiver
Here you can see an off-the-shelf Home Theater receiver with
class D output stages - this one doesn't work at all below 4
ohms.
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Class D.
Well known brand
Home theatre receiver
Take a look at this poor example. However, this amplifier
doesn't shut down quite as early into 1 or 2 ohms - so it has a
better chance of handling the dynamic impedance dips of a
real-world loudspeaker.
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Rotel RB971
Stereo amplifier
While you can't really expect to find an amplifier that will
produce a perfect cube, you can see a good example here. This is
a very well designed two channel amplifier from Rotel. |
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Rockford Fosgate
T15kW
The best cube ever. The T15kW amplifier uses HT Technology
which gives the amplifier unmatched dynamic power capabilities.
The cube is near perfect, but expect to pay USD 20,000! |
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 PowerCube brochure
New, extended version!
Download our
PowerCube brochure
here
(698kB, pdf-format, Adobe Acrobat
required)
China and Hong-Kong
AP Technology Ltd are our representative. Download the Chinese version of the PowerCube brochure and read
more about AP Technology Ltd.
> Read more
>
Download
the Chinese version of the PowerCube pdf
Malaysia, Thailand and Singapore
Malaysia based company Test
Measurement & Engineering (TME),
are our representative.
> Read more
About AudioGraph
AudioGraph manufactures computerized audio measuring systems and measure
audio products on requests. Among our customers you will find Sony,
Alpine, Volvo, Nokia, Clarion, harman/kardon, Teac, Rockford Fosgate, Zeck...
The System
The PowerCube Measurement system, which is just one of our products, is
used by manufacturers, audio magazines and high end repair-shops.
> Want us to do
the measurements for you?
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