The evolution of a legendary nearfield monitor.
More than 30 glowing reviews, numerous awards, and countless dedicated fans made the A7, the predecessor
of this new model, a true legend in nearfield monitoring. Now, the legend continues with the A7X: All drivers, all amplifiers,
as well as the cabinet have been revised, resulting in a speaker that claims nothing less but to be a new benchmark in nearfield
monitoring.
Driver technology
The first aspect that distiguishes the old from the new model is the X-ART tweeter. The ‘X’ stands for ‘eXtended
frequency response’ and thus for one of the features of the Accelerating Ribbon Technology that has been drastically
improved: the frequency response. It now extends all the way up to 50kHz. In addition, the X-ART tweeter has a higher efficiency
and higher maximum sound pressure levels.
The perfect integration with the lower frequencies has been achieved with
a newly designed 7” midwoofer. It has been redesigned with a much bigger voice coil (1.5”) and is driven by an
amplifier with twice the power compared to its predecessor. This combination produces an amazing sound and pressure levels
with an almost distortion-free musical reproduction.
Amplifiers / controls
Each driver has its own dedicated amplifier. A 50W A/B amp is responsible for the X-ART tweeter, while the midwoofer is being
driven by a 100W PWM (Pulse Width Modulation) amp. The front panel includes a power switch and a control for the volume that
retains the volume setting independently from the on/off switch.
On the rear panel of the A7X are several additional
controls: a gain for the high frequencies (± 4dB) and two shelf filters for high and low frequencies. To ensure greater
compatibility, there are both XLR (balanced) and RCA (unbalanced) connectors.
X-ART Technology
The X-ART (eXtended Accelerating Ribbon Technology) tweeters and midranges incorporate a new approach to the Air Motion Transformer
concept originally developed by Dr. Oskar Heil. ADAM Audio has improved upon this splendid idea utilizing superior geometries
and materials to achieve unprecedented audio fidelity. X-ART strikes a new path concerning the kinematics of moving air, resulting
in a dramatic improvement in the quality of audio reproduction.
The X-ART membrane consists of a pleated diaphragm
in which the folds compress or expand according to the audio signal applied to them. The result is that air is drawn in and
squeezed out, like the bellows of an accordion.
The ADAM X-ART design overcomes the piston-like motion of all conventional
drivers and their inevitable problems by achieving an improvement in air loading by a factor of 4 over conventional transducers.
To illustrate the basic principle by a comparison: When you breathe, your thorax is moving slowly whereas the air is moving
comparably fast. Similarly, the X-ART diaphragm presses the air faster in or out of its folds than they themselves are moving.
This markedly superior ”motor” is responsible for the unprecedented clarity and pristine transient reproduction
that can be heard with the ADAM X-ART drive units.
In addition, the X-ART tweeter’s pleated membrane avoids the
typical breakup/distortion and subsequent dynamic limiting at higher frequencies of stiffer voice coil designs, such as those
found in dome and cone tweeters. Another positive result of the X-ART design is that the driving ”stripes” are
in direct contact with the outer air and are cooled immediately.
Pulse Width Modulation
PWM (Pulse Width Modulation) – sometimes referred to as Class D amplification, sometimes called Switching Amp Technology
– converts the incoming signal to a series of rectangular waveforms of equal height. The width of the rectangles varies
in time and the relation of the width of the rectangles represents the musical signal. This waveform can be amplified much
more simply, as the transistors are not modulated anymore; instead they are used as switches that only turn the power supply
voltage on and off.
It is possible that a very fast mechanical switch could do the job, but power transistors are a
better choice for the task, so PWM amplifiers still work pretty much like conventional Class AB designs. It is important to
note there are no bits and bytes involved, so “Digital Amplifier” is a misleading and inaccurate term.
The
main advantage of PWM amplifiers is their extremely high efficiency (>90%). As a consequence the heat to be dissipated is
only one fifth of earlier designs, leading to much lower temperatures within the amps and making the use of heat sinks obsolete.
This
principle has been known for decades, but time was needed to develop units that perform at the leading edge in sonic reproduction
quality and yet still maintain the high efficiency mentioned previously. The ADAM units use the new technology for both the
amp and the power supply section (i.e. no more transformers) combined with state of the art input and filter sections to achieve
the best in multi-channel active studio monitoring.
ADAM Audio ADAM Audio A7X Powered Monitor Features:
- Excels at nearfield monitoring
- Equipped with the X-ART tweeter and a large (7") midwoofer
- 50W A/B tweeter amplifier
- 100W PWM midwoofer amplifier
- Upper corners slanted to minimize reflections
- Large, double bass reflex tubes
- ±4dB gain for the high frequencies
- Two shelf filters for the high and low frequencies
- XLR (balanced) and RCA (unbalanced) connectors
Order a pro monitor with a great price/performance ratio!
ADAM Audio ADAM Audio A7X Powered Monitor Specifications:
- Mid-Woofer
- Number: 1
- Basket Ø: 7" (177.8 mm)
- Voice coil Ø: 1.5" (38 mm)
- Cone material: Carbon/Rohacell/Glass Fiber
Tweeter
- Number: 1
- Type: X-ART
- Diaphragm area: 4 inch (2420 mm)
- Equivelent diaphragm Ø: 2" (56 mm)
- Velocity transform ratio: 4:1
- Diaphragm weight: 0.17 g
Built-in Amplifiers
- Mid-Woofer: 1
- Type: PWM
- Amp. power RMS / music: 100 W / 150 W
- Tweeter: 1
- Type: A/B
- Amp. power RMS / music: 50 W / 75 W
Control panel
- Input Sensitivity: -∞ to +14 dB
- High shelve > 5 kHz: ±6 dB
- Low shelve < 300 Hz: ±6 dB
- Tweeter gain: ±4 dB
Input connectors
- Analog: XLR / RCA
General data
- Frequency response: 42 Hz - 50 kHz
- THD: 90dB/1m > 100 Hz: ≤0.5 %
- Long term output: ≥106 dB
- Max. peak: ≥: 114 dB
- Crossover frequencies: 2500 Hz
- Input impedance: 30 KOhm
- Weight: 20.3 lb. (9.2 kg)
- Magnetically shielded: No
- Height x Width x Depth: 13.5" (400 mm) x 8" (255 mm) x 11" (320 mm) Warranty: 5 Years