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Hollywood Impulse Response Technical Notes

“Hollywood Impulse Responses (HIR) was inspired by the ambiences of 20 major Hollywood films released between 1977-2006. The musical scores for these films were recorded in some of the greatest recording studios, sound stages and concert halls in Hollywood and London. The sound of these films was designed to give the listener a “larger than life” listening experience, so often the actual impulses of these rooms are not accurate reproductions of actual acoustic spaces.

The source material in these film recordings often contained more bass and lower midrange power than comparable “normal” acoustic spaces, so the perceived size of the reverberant space is often much larger than these studios' physical dimensions would ever be able to create.

For an engineer to get this type of sound a pair of ambient mics would be placed a good distance from the orchestra (usually placed near the ceiling), routed to a digital reverberation unit and then EQ'ed before blending them with the dry signals into the final mix. This approach “samples” the natural acoustics of the room by capturing phase and delay differences between the direct sound and the ambient mics. When all of the dry and wet signals are mixed together, the resultant sound is huge. Capturing and making available to users the immensity and grandeur of the Hollywood film sound is the central focus of this library. Due to this additional signal processing, film ambience is more a composite reverberation impulse (CRI) which is electro-acoustic in nature.

Two Unique Features

There are two new features in HIR that are new to the word of ambience. First there is the addition of specially filtered RIs designed to adjust the timbre of the overall reverb sound when it is mixed in with the original dry signal. These filters are unique and do not exist in normal analog or digital gear. You have four variations of each RI to choose from: Dark, Warm, Flat, Clear and Bright. The Flat RIs are neutral and do not change the timbre of the source material.

The second new feature is the addition of 6 sets of RI's that are high pass filtered at points of the frequency spectrum that match the exact range of many orchestral instruments. These points are at notes C2, G2, C3, G3, C4 (middle C), and G4. These “instrument designed” RI's add much more sonic precision and clarity to existing sampled instruments and libraries. For example, RI's from the 04_G3 will exactly match the range of a solo Violin and optimize its tonal character. C3 will optimize Viola timbre and C2 will optimize the timbre of a Cello.

Three numbers are used to describe the "timbral" quality of each RI. These numbers give the user an indication of the relative length of the decay time of the bass, midrange and treble frequency bands. Every RI, regardless of the category, is referenced to the same hall with the average median of (Lo Mid Hi ) 100 100 100. For example, HIR no. 4 has a RI decay characteristic of 129 89 83 which means that the bass frequencies ring or resonate 129% more that the reference hall, 89% (or 11% less) in the midrange band and 83% (or 17% less) in the treble region. So, overall this reverb has a darker sound with more low end resonance. Remember that your source material has to have bass energy in order to hear the RI's effect on low end resonance.

Maximum Ambience for an Audio Sequencer

Once you've completed your arrangement, create several 100% wet tracks using your convolution program (Space Designer, Pristine Space or others), a dry track and the desired HIR to generate the ambience track. Make sure that there is no direct (dry) signal in the wet track. There are 5 different tones for each RI so you could have a Dark, Warm, Flat, Clear & Bright ambient tracks as well as other halls or other HIR pitches all at the same time. In the mixing stage you can use automation to mix the desired ambient track(s) in the final mix changing the levels and thus the tone of each individual instrument in the mix as well as having the tone “evolve” through the course of the mix by changing the levels of selected wet tracks.

All the reverberation impulses are digitally watermarked with a serial number so that each reverb impulse is traceable to the purchaser of this product. HIR ambience can be detected in a final audio mix.

RI File Name Type of Hall Location Bass Mid-Range Treble
01_SmSndStg
02_SmSndStg
03_SmSndStg
04_MedSndStg
05_MedSndStg
06_MedSndStg
07_MedSndStg
08_MedSndStg
09_MedSndStg
10_LgSympHall
11_LgSympHall
12_LgSympHall
13_LgSympHall
14_LgSympHall
15_LgSndStg
16_LgSndStg
17_LgSndStg
18_HugeSympHall
19_HugeSndStg
20_HugeSndStg
Small Sound Stage
Small Sound Stage
Small Sound Stage
Medium Sound Stage
Medium Sound Stage
Medium Sound Stage
Medium Sound Stage
Medium Sound Stage
Medium Sound Stage
Large Symphony Hall
Large Symphony Hall
Large Symphony Hall
Large Symphony Hall
Large Symphony Hall
Large Symphony Hall
Large Symphony Hall
Large Symphony Hall
Huge Symphony Hall
Huge Sound Stage
Huge Sound Stage
Toronto
London
London
Los Angeles
London
London
London
San Francisco
London
Boston
USA
USA
USA
USA
London
Los Angeles
UK
Boston
London
London
68
77
84
129
113
95
138
112
94
87
110
114
108
139
115
129
102
183
181
154
78
80
93
89
90
102
96
102
99
120
113
123
130
107
123
132
126
133
156
197
90
93
102
83
81
119
97
127
101
128
116
117
138
125
120
124
118
135
128
200

User Guidelines (Just Suggestions!)

For Set 1 note C2 Full Range Instruments such as Doublke Bass, Cello & Tuba
For Set 2 note G2 Tympani, Trombone
For Set 3 note C3 Viola, Trumpet
For Set 4 note G3 Violin, Alto flute
For Set 5 note C4 Flute, Piccolo, Trumpet & Oboe
For Set 6 note G4 1st Violins, Percussion & Lead Instruments

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  • Home
  • Products
    • Rack Extensions >
      • ReBass Wide
      • Bass Tilt Filters
      • Midrange Tilt Filters
      • Treble Tilt Filters
      • Tone Mutation Vocals
      • ReBass Narrow
      • ReStereo
      • Tone Mutation Instruments
      • RiVerb Up-Front
      • riverb_studios_sndstages_sym_halls
    • Timbral Impulse Products >
      • Hollywood Sound Timbral Impulse: The LASS Edition
      • universal_sordino
    • Reverberation Impluse Products >
      • Hollywood Sound IR
      • Hollywood Impulse Responses >
        • Hollywood Impulse Response Demo >
          • Laurence Stevenson
          • Lawrence Spector
        • Hollywood Impulse Notes
        • Pure Space Classical
        • Pure Space Film >
          • Pure Space Demos
      • FORTI SERTI >
        • FORTI and SERTI Shootout
        • Forti Serti Audio Demos >
          • String Timbres
    • Sampling CDS >
      • New Orleans >
        • New Orleans Notes
    • Drone Archeology >
      • Drone Archeology Notes
    • Sly Dunbar
    • Clyde Stubblefielf
    • Bernard Purdie
    • Armando Bog
    • Kick n Jazz
    • DNA Groove Templates >
      • DNA RandB
      • DNA Jazz Collection
      • DNA Pop & Rock Collection
      • DNA Rhythm Central (Bernard Purdie)
      • DNA Clyde Stubblefield
      • DNA Armando Bog
      • DNA Sly Dunbar
      • DNA Kick n Jazz
      • DNA Groove Templates Note
    • Midi Files >
      • Midi Rhythm Central
      • Midi Clyde Stubblefield
      • Midi Armando Bog
      • Midi Sly Dunbar
      • Midi Kick n Jazz
    • Bluthner Digital Mode >
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    • Product Reviews >
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