8-Channel
Unidirectional Level Interface - Consumer to Pro
|
|
Audio
Quality |
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.
|
|
Aphex Leads The Way |
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.
|
| Unmatched
Reliability |
Aphex
engineering and manufacturing pro-duces 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 flaw-lessly and give you peace of mind.
|
| Useful
Extras |
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.
|
| Level
Translation: A Very Brief Tutorial |
| 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.
|
| Typical
Uses |
Broadcast,
Recording, Film, Home Theater, Installed and Mobile Sound, DAW
Input, Mastering.
|
| Features |
|
| •
8 Discrete -10dBV RCA inputs |
| •
8 Discrete +4dBu XLR Outputs |
| •
8 Signal Presence/Clip Lights |
| •
Extended Range VU Meter |
| •
8 Gain Trims |
| •
Gold Plated Connectors |
| •
Calibrated 11.78dB Gain (Exact -10dBV to +4dBu translation)
|
| •
12dB Attenuation Range (Great for unity gain applications) |
| •
Low Noise |
| •
High Definition Audio |
| •
Impedance Balanced Outputs |
| •
High Reliability |
| •
Calibration CD included |
| •
Front Panel Dimming |
