Aphex Pro x8 228 Manual, Specifications

• 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
8-Channel Unidirectional Level Interface
Consumer Out to Pro In
w w w . a p h e x . c o m
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  unbal-
anced inputs. The audio circuitry was care-
fully crafted throughout to maximize  sonic 
performance.    There  are  no  cookbook 
audio 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  reputa-
tion  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  cre-
ated  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 pres-
ent 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.  Counterclock-
wise,  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 equip-
ment.
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  ver-
sions,  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
228Audio Interface
|
®
C US
59887
PRO x8
CONSUMER
SPECIFICATIONS
Rated at nominal gain (11.78dB)
Inputs:     8 Unbalanced, RCA Female
Outputs:     8 Balanced, XLR 3-Pin Male
Gain Translation:  11.78dB Adjustable +/- 6dB
THD:     Less than .005% at MOL
IMD:     Less than .005% at MOL
Output Noise:   -80dB @input shorted
SNR:    84dB 
Dynamic Range:  104dB
Max Output Level (MOL):  +24dBu, load > 600 ohms
Max Input Level (MIL):  3.55V RMS 
Power Supply:  Internal, fused
Power Requirements:  100/120/240V~ 50/60Hz
Size:    19 in. W x 1.75 in. H x 9 in. D
Net Weight:   5lbs.
Aphex Systems Ltd. • 11068 Randall St., Sun Valley, CA 91352.  Tel: (818) 767-2929  Fax: (818) 767-2641 Email: [email protected] . Aphex  
and Compellor are registered trademarks. 
S Y S T E M S
Improving The Way The World Sounds

228_cutsheet.indd 1/6/2004, 12:49 PM1

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