| Audio Quality |
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This is not just a buzzword
at Aphex. Our products are known around the world for their ultra high sound
quality. It's our benchmark. Given that the Model 228 is a relatively simple
product, nothing more than a level interface, we placed a high priority
on endowing it with the best sound quality possible. That's why we designed
it with high voltage impedance balanced outputs and ground loop isolating
unbalanced inputs. The audio circuitry was carefully crafted throughout
to maximize sonic performance. There are no cookbook circuits in the 228.
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| Aphex Leads
The Way |
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There are plenty of stereo level interfaces
out there from various manufacturers. Of these, the Aphex
124A enjoys a reputation as the one of the world’s finest. The
124 blazed a trail with it’s high definition servo balanced input and
output circuits and remains as the premier bidirectional stereo level interface.
However, the need for something else is becoming acute.
Today’s multichannel sound of
5, 6, 7 or more channels makes using two channel interfaces cumbersome and
expensive. Furthermore, the greatest need by far is to translate consumer
level outputs to professional level inputs. Bidirectionality is seldom needed.
That’s why Aphex created the Model 228 Unidirectional Level Interface.
It is perfectly suited to the vast majority of multichannel uses in the
studio and the theater.
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| Unmatched Reliability |
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Aphex engineering and manufacturing
produces products that last and last without need for repairs or calibration.
Some of our products have literally been in 24-hour use in the same rack
for a decade or longer! When you specify a Model 228, you know it will do
its job flawlessly and give you peace of mind.
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| Useful Extras |
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The 228 combines outstanding audio performance
with utility features that will make your installation and operation much
easier. The front panel extended range VU meter lets you calibrate and monitor
each channel individually. Eight 2-color signal presence/clip indicators
let you know instantly if sound is present on each channel and if overload
occurs.
Front panel gain trims for all eight
channels allow you to balance the match gain. Fully clockwise, gain is calibrated
to the reference 11.78dB. Counterclockwise, the trimmer attenuates by 12dB,
giving you unity gain. For theater installations, a provision is made to
dim all the lights on the front panel.
A test CD with commonly used reference levels is included
for easily matching up your specific equipment.
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| Level Translation:
A Very Brief Tutorial |
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Mixing of consumer and professional
grade audio equipment is occurring more and more. For example, consumer
DVD players cost far less than pro versions, but don’t readily connect
to the input of a studio console or monitor system. Another example: the
high-end power amplifiers being used in home theaters have balanced line
level inputs and can’t be driven directly from the consumer decoders
and preamps. In such cases, a multichannel consumer-to-pro level interface
is needed that can receive from a consumer level RCA jack at -10dBV (316mV
RMS) and send to a pro level XLR jack at +4dBu (1.228V RMS). That requires
a voltage gain of 3.886, which can also be stated as 11.79dB.
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| Typical Uses |
| Broadcast, Recording, Film, Home Theater,
Installed and Mobile Sound, DAW Input, Mastering. |
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| Features |
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8 Discrete -10dBV RCA inputs |
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8 Discrete +4dBu XLR Outputs |
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8 Signal Presence/Clip Lights |
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Extended Range VU Meter |
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8 Gain Trims |
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Gold Plated Connectors |
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Calibrated 11.78dB Gain (Exact
-10dBV to +4dBu translation) |
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12dB Attenuation Range (Great
for unity gain applications) |
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Low Noise |
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High Definition Audio |
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Impedance Balanced Outputs |
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High Reliability |
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Front Panel Dimming |
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| SPECIFICATIONS
- Aphex Model 228 8 Channel Unidirectional Level Interface |
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Consumer
Out to Pro In |
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| AUDIO |
Rated
at nominal gain (11.78dB) |
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Inputs |
8 unbalanced RCA |
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Outputs |
8 Balanced XLR 3-pin
Male |
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Gain Translation |
11.78 dB Adjustable
±6 dB |
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Frequency Response |
-3dB @ .16 Hz and 80
kHz |
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THD @ max output |
Less than .001% at M.O.L. |
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IMD @ max output |
Less than .001% at M.O.L. |
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Output Noise |
Better than -90dBu,
input shorted |
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SNR |
94 dB |
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Dynamic Range |
114 dB |
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Max Output Level (MOL) |
+24dBu |
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Max Input Level |
3.55V RMS |
| OTHER
SPECIFICATIONS |
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Power Requirements |
100 / 120 / 220 / 240
VAC 50-60 Hz 20 Watts max |
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Dimensions |
19"W x 1.75"H
x 9" D (482.6mm
x 44.5mm x 228.6mm) |
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Power Supply |
Internal, Fused |
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Net Weight |
5 lbs (2.27
kg) |
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625k
625k
