Universal Audio UAD POWERED PLUG-INS ver.6.1 - Manual (Page 490)

UAD Powered Plug-Ins Manual - 490 - Chapter 48: RealVerb Pro
tion frequency, the frequency at which the decay rate is halfway between the
low-frequency and high-frequency values. At 100% thickness, the ratio of low-
frequency to high-frequency decay times is 10:1. This means that the high fre-
quencies will decay 10 times faster than the low frequencies. At 200% thick-
ness, this is multiplied by two (high frequencies decay at 20x the rate of the
low frequencies). At negative 100%, the sense of low frequency and high fre-
quency is swapped —low frequencies decay 10 times faster than the high fre-
quencies.
Many hardware and software reverbs tend to compensate for the high fre-
quency absorption that air provides. RealVerb Pro instead provides “Air” as
a material. If you do not choose to use Air as one of the materials, you can
effectively compensate for the high frequency absorption properties of air
with the Resonance filters. Set the right-hand Transition Frequency slider to
4.794 kHz, and bring the level down about –10 dB to –15 dB for large to
huge rooms, and down about –4 dB to –9 dB for small to medium rooms.
To help you out, the following lists classify the materials under two headings:
those that tend to reflect high frequencies, and those that tend to absorb them.
They are listed in order of their transition frequencies, from lowest to highest.
Table 38. Materials with high-frequency absorption
Audience Fiberglass
Cellulose Grass
Drapery Plaster on Brick
Plaster on Concrete Block Water Surface
Soil Sand
Gravel Brick
Paint on Concrete Block Air
Carpet
Table 39. Materials with high-frequency reflection
Heavy Plate Glass Seats
Plywood Marble
Hardwood Concrete Block
Glass Window Linoleum
Cork