Support Files for GratisVolver
These are the files referenced in Course 320 – Sound System Design – Room Acoustics
GratisVolver™ Program www.catt.se
Forward and Inverse Sweep Files (Zip File 3 MB) Logsweeps_14s
GratisVolver™ Procedures PDF File
Entries by Pat Brown
Gain Structure Made Easy
Download a test waveform that will help you quickly set the gain structure of your system.
This is an updated version of a previous article. After using the meter test file for a few years, I was inspired to produce … Read more
Power Ratings Use and Abuse
by Pat Brown
Is a power rating for the sales force or for the system designer?
“One number” power ratings for both loudspeakers and amplifiers are now accepted at face value and seldom questioned. Large numbers are tossed around, often … Read more
Room Survey 31 – O’Reilly Theater
Location: Pittsburg, PA
Investigator: Pat Brown
Description: The O’Reilly Theater is a 650 seats semi-reverberant space located in the famous Pittsburg cultural district. The reverberation time is just under 1 sec, with the acoustics of the space optimized for natural … Read more
Can the Half-Dodec Provide Another Option for Room Acoustics Testing?
The half-dodec can provide another option to get the room acoustics data needed to properly model the space.
The first step in the sound system design process is the acoustical site survey. For many projects it is important to assess … Read more
What does “Constant Voltage” Mean?
“Constant voltage” is one of the more confusing terms used by the audio industry. Pat Brown brings clarification to this term.
Those new to the audio field are often dismayed by the subjective nature of many audio terms, which may … Read more
Room Survey 30 – China University of Communication
Location: Beijing, China
Investigator: Pat Brown
Description: Large recording studio (52,000 ft³) at university. Walls are combination of absorption and scattering. The room was partially occupied (about 60 people). With a T30 of about 0.6 sec, this room is not … Read more
Room Survey 29 – 9600-seat Auditorium
Location: Southeast Christian Church – Louisville, KY
Investigator: Pat Brown
Description: Low and medium Q source comparison. The low Q source is a dodecahedron. The medium Q source is a QSC K12. The distances are 30 ft, 60 ft, and … Read more
Room Survey 28 – Extreme Flutter Echo
by Pat Brown
Mark Haymond sent me an interesting impulse response that serves as a great example of “flutter” echo. It was captured at a pistol range, where the shooter stands between two block walls, with an earth berm at … Read more