Appendix CAppendix376
Amplitude
High-Frequency Information Completely Lost
High-Frequency Content
A/D Clip Level
Low-Frequency Content
Time
A/D Clip Level
High-Frequency Information Completely Lost
Figure 3c - Disproportionate Loss of High-Frequency Information Due to Clipping
Amplitude
0 dB FSA/D Clip Level
}TYPE IVa Over Region
-4
Time
-4
TYPE IVa Over Region
}
0 dB FSA/D Clip Level
Figure 3d - Type IV Mapping Preserves High-Frequency Information
Now youOre probably wondering, OWhatOs the catch? I canOt get something for nothing so what did I give up?� You
may be worried that your A/D noise floor got 4 dB worse because we borrowed the top 4 dB of your converter. This is
certainly a valid concern. Fortunately, we have the answer! Without going into the confidential technical details, by using
our proprietary analog and digital Type IVa processing, we reclaim the original A/D noise level! So what you get is free
headroom!
The benefits of the dbx Type IVa Conversion System can easily be heard by switching it in and out while listening
to signals with high-level peaks captured in the Type IVa Over Region. You will notice an obvious audible difference.
With Type IVa bypassed, you canOt help notice the harsh, edgy sound of the A/D converter clipping. With Type IVa
enabled, those nasty artifacts disappear revealing a more open and natural sound. With Type IVa enabled, you will get
a more accurate and pure representation of the original wide-dynamic-range signal. You will absolutely agree that we
really do give you Osomething for nothing.� We give you peace of mind knowing that you never have to worry about
clipping your A/D again! And when you listen to the noise floor of your A/D, youOll realize that we never compromise
your noise performance with Type IVa!
The dbx Type IVa Conversion System succeeds in combining the best of the analog and digital worlds to capture
the truest essence and fullest dynamic range of audio signals. Who else but dbx would bring you this technology!
¨
376 User Manual
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ACEC
