Howard L. Schrott Center for the Arts Tour

TOUR: Howard L. Schrott Center for the Arts


LOCATION:  Howard L. Schrott Center for the Arts at Butler University

DIRECTIONS: The Schrott Center is located on the Butler University campus at the corner of W. 46th Street & Sunset Avenue. It’s Bldg. 28 on this map: and here is a link to Google Maps:


Parking will be available in the lot immediately behind the Schrott Center (off Sunset Ave.).  There’s a lot of construction in the area – we will send out a reminder several days before in the event of any changes in road access or parking.

Our host and resident technical guru will be Dennis Long, Production Manager for the facility.  Dennis’ background includes years of experience in a theatrical performance facilities as well as a strong electronic engineering background in television and related areas.

Schrott Center was planned and designed to be primarily a classical performance hall (Clowes Hall is now accommodating many road shows).  We’ll take a tour throughout the facility, including access, HVAC, theatrical/performance support areas and various systems – lighting, sound, video, etc.

David Wright from Wright Consulting Associates is able to join us for a brief discussion of the acoustical aspects of the performance hall.  Wright Consulting Associates Inc. was hired by Butler University for electro-acoustics consulting.  WCA Inc. worked with Bonner & Associates from Texas for sound system design to integrate the architect’s variable acoustics approach for the room.  David will review room modeling, variable acoustics, room diffusion and how the sound system reacts to the acoustical design.

** Click on the following RSVP if you plan to attend – the earlier the better!

Pat Brown – September 10, 2014

LOCATION:  WFYI COMMUNITY ROOM (1630 N. Meridian St. Indianapolis, IN 46202)


TOPIC:  There are few things more confusing in the audio marketplace than amplifier and loudspeaker performance specifications. Their origins are often obscure. Their validity is often questioned. While the likelihood is high that there will someday be meaningful, universally-recognized Standards for these metrics, in the meantime audio engineers must specify and deploy loudspeakers and amplifiers. The “Common Formats” have addressed the problem by providing real-world, defensible methods determining key loudspeaker and amplifier metrics for use by sound system designers. The Common Loudspeaker Format (CLF) has become the most widely used data format for room modeling programs. The Common Amplifier Format (CAF) builds upon it. Together they give the sound system designer everything needed to deploy loudspeakers and amplifiers. Pat Brown will present the major tenets of each.

RSVP – Eventbrite

Meeting Announcement – Sept with Russ Berger at Sweetwater Sound

20121026-RussBerger_200The Central Indiana Section of the Audio Engineering Society is pleased to announce a meeting with Russ Berger of Russ Berger Design Group. His topic for the evening will be “Recent Developments in Acoustics for Studios; Our latest thinking on acoustical treatments for critical listening spaces.”

Russ Berger is president of Russ Berger Design Group (, an acoustical and architectural design firm in Addison, TX specializing in recording, radio and television broadcast studios; facilities for entertainment and media content, audio, film, and post production; technical learning environments for higher education; private theaters; and corporate production spaces. The recipient of eight TEC awards for acoustics and facility design, Russ has more than 2,500 projects to his credit, including NFL Films, National Public Radio, NBC, ABC, and Sweetwater.

Russ has been an active member of AES since co-founding the Dallas AES chapter in the mid 1970s.  He has been a board member of the National Council of Acoustical Consultants since 1994 (President 2008-2010) and currently is on NCAC’s Long Range Planning Committee.  Russ is a Fellow of the Acoustical Society of America and holds membership in SMPTE, SPARS and CEDIA.  He is one of the original licensees for performing TEF measurements, and is the 2007 Heyser Award recipient.

The meeting will be held September 19th, 7:30pm at Sweetwater Sound. To ensure an accurate count for the meeting, please RSVP below.

Meeting Information

Date: Sept 19, 2013 at 7:30pm
Location: Sweetwater Sound, Inc.
5501 U.S. Hwy 30 W, Fort Wayne, IN 46818


Meeting Announcement – July with Don Keele at Farm Fresh Studios

The Central Indiana Section of the Audio Engineering Society is pleased to announce our July meeting, to be held Thursday July 18, 2013 featuring Don Keele speaking on the topic of “Introduction to CBT Loudspeaker Arrays.”

Come out and hear Don Keele talk about his loudspeaker line arrays based on CBT technology. He has been an ardent advocate and evangelist for the concepts for over ten years and believes the CBT know-how can vastly improve the sound field uniformity of existing line arrays and conventional loudspeaker systems. Don will discuss the background and history of CBT arrays and will describe and discuss the measurement and simulation results of several CBT line arrays including the Audio Artistry CBT36 high-end home loudspeaker which is sold in an inexpensive DIY kit form by Parts Express ( and finished form by Audio Artistry. The CBT36 system will be setup for listening.

We have invited percussionist John Marque ( to participate in a live-versus-recorded drum-kit shootout with the pair of CBT36 systems.

CBT, which stands for “Constant Beamwidth Transducer,” is a term originated by the U.S. military in a series of three un-classified Naval Research Lab ASA papers published in the late 70s and early 80s. These papers describe spherical-cap underwater transducers with special frequency-independent “Legendre” shading that provide extremely-uniform broadband coverage without the need for any special or complex signal processing. Don applied the technology to loudspeaker arrays in a series of six AES papers between 2000 and 2010 and some of the technology is now in the public domain. The CBT arrays provide a broadband constant-directivity 3D sound field that is incredibly uniform and well behaved with frequency at all distances from very close to far away. The vertical beamwidth control and coverage of the CBT line arrays often exceeds even the finest constant-directivity pro horns.
The CBT line-array concept dictates that multiple loudspeakers be placed evenly around a circular arc and that frequency-independent shading (simple changes in level) be applied to each speaker. An alternate, but much more complex, CBT implementation method is based on the use of delays to provide the circular curvature of a straight-line array. Circular-arc CBT arrays can be implemented passively and do not require any sophisticated DSP signal processing except for simple level changes. CBT array possibilities extend over the full loudspeaker product range from professional, commercial, consumer, home theater, computer, and multimedia. Note that Harman/JBL has copyrighted the term “CBT” in the loudspeaker industry where it stands for “Constant Beamwidth Technology” and has three patents issued to Keele on some of the CBT concepts.

D.B. (Don) Keele, Jr. has worked for several companies in the area of loudspeaker R&D and measurement technology including Electro-Voice, Klipsch, JBL, Crown, and Harman International. He holds eight patents with topics including “constant-directivity” loudspeaker horns, loudspeaker arrays, and signal processing. He is a fellow of AES. For ten years he wrote for Audio Magazine as a Senior Editor performing loudspeaker reviews. More recently, he worked for Harman/Becker Automotive Systems in the advanced technology development group and was a member of the Harman corporate acoustics engineering group working under Floyd Toole. Currently he heads his own consulting company DBK Associates and Labs and recently joined loudspeaker manufacturer Audio Artistry as VP of R&D. His passion for the last eleven years has been to promote the use of CBT (Constant Beamwidth Transducer) loudspeaker technology in the loudspeaker industry.

Mr. Keele holds two BS degrees in EE and Physics from California State Polytechnic University and an MSEE degree from Brigham Young University where he minored in acoustics. He has presented and published over 40 technical papers on loudspeaker design and measurement methods and other related topics, among them the paper for which he won the AES Publication Award, “Low-Frequency Loudspeaker Assessment by Nearfield Sound-Pressure Measurement”. He is a frequent speaker at AES section meetings and workshops, has chaired several AES technical paper sessions, and is a past member of the AES review board. Mr. Keele is a past member of the AES Board of Governors and is past Vice President, Central Region USA/Canada of the AES. Mr. Keele received the TEF Richard C. Heyser Award in 2001. In 2002, he received a Scientific and Engineering Academy Award from the Academy of Motion Picture Arts and Sciences for work he did on cinema constant-directivity loudspeakers. In 2011 he received the ALMA Beryllium Lifetime Achievement Award for contributions to the loudspeaker industry.

The meeting will be held July 18, 2013 at 7:30pm in Farm Fresh Studios To ensure an accurate count for the meeting, please RSVP .


Meeting Information

Date: July 18, 2013 at 7:30pm
Location: Farm Fresh Studios
2115 N Mount Gilead Rd
Bloomington, IN  47408 (map)

Bill Whitlock “An Overview of Audio System Grounding and Interfacing”


“An Overview of Audio System Grounding and Interfacing”
presented by Bill Whitlock

When: 7:00-10:00pm, September 4, 2012 — Doors open at 7pm

J.W. Marriott Hotel — Grand Ballroom 7-8
10 S. West Street, Indianapolis, IN 46204 (primary address) (map).

The meeting will be held in the hotel’s Grand Ballroom.  Refreshments will be provided.  Paid parking is available onsite or across the street at the Indiana State Museum.


The Central Indiana AES is pleased to welcome Bill Whitlock to Indianapolis for an in depth discussion regarding audio syatem grounding and interfacing.  Bill will share his knowledge and experience, revealing the true causes of system noise and ground loops. Unbalanced interfaces are exquisitely vulnerable to noise due to an intrinsic problem . Although balanced interfaces are theoretically noise-free, they’re widely misunderstood by equipment designers, which often results in inadequate noise rejection in real-world systems. Because of a widespread design error, some equipment has a built-in noise problem . Simple, no-test-equipment, troubleshooting methods can pinpoint the location and cause of system noise. Ground isolators in the signal path solve the fundamental noise coupling problems. Also discussed are unbalanced to balanced connections, RF interference, and power line treatments. Bill will also point out some widely used “cures” that are both illegal and deadly.

Bill Whitlock has designed analog electronics since 1972, serving as chief electronics engineer for Quad-Eight, Laserium®, and Capitol Records prior to joining Jensen Transformers in 1989 after Deane Jensen’s untimely death. His writings have been published in the AES Journal, Glen Ballou’s “Handbook for Sound Engineers,” Doug Self’s “Audio Engineering Explained,” nearly all Jensen white papers, and numerous magazine articles. Bill is also active in standards work for AES, UL, IEC, and CEA.

His four patents include the InGenius® balanced line receiver IC and the ExactPower® high-speed, waveform-correcting AC voltage regulator. He’s a Life Fellow of the AES and a Life Senior Member of the IEEE.

Please RSVP if you intend on coming and feel free to bring non-AES members, all are welcome.  We look forward to seeing you there. Attendance is free but seating is limited to 150, so please RSVP


Tour of Hilbert Circle Theatre and Shure Axient Demonstration

All are welcome to meet for dinner/drinks prior to the formal meeting and tour with the new Central Indiana AES officers at 5:30 at the downtown California Pizza Kitchen (49 W. Maryland St.). Dinner is not complimentary and there will not be snacks available during the 7:00 meeting. Please plan accordingly.

Should be an awesome event. We look forward to seeing new and old AES faces alike!

Circle Theatre Entry Instructions: Please do not try to to enter the theatre at the main entrance, off the circle at 45 Monument Circle. These doors will be locked and there will not be anyone present to open them.

The backstage entrance within the Symphony Center will be open for event attendees at 32 E. Washington Street. There is a security desk just inside this entrance where you can let the receptionist know you are part of the AES tour group. Please congregate in the musician’s lounge prior to the 7PM meeting and tour.

Parking Instructions: There is metered street parking and there is a pay parking lot across the street from Symphony Center. The backstage entrance is at 32 E. Washington Street. There are also parking garages on both sides of Pennsylvania Avenue, between Market Street and Washington Street. The Circle Center Mall parking lot on Washington Street will also be available and is walking distance from the entrance.

Express Park is the nearest parking garage to the Symphony Center entrance. It adjoins the alley next to the theatre. From the garage, walking south down the alley to Washington Street and then west about 20 paces will put you at the Symphony Center door.

To ensure an accurate count for the meeting, please RSVP

Meeting Information
Date: August 21, 2012

Dinner Time: 5:30pm.
Dinner Location: California Pizza Kitchen (Downtown Circle Center)
49 W. Maryland St. Indianapolis, IN 46204 (map).

Tour Time: 7:00pm.
Tour Location: Hilbert Circle Theatre Musician Entrance
32 E. Washington Street, Indianapolis, IN 46204 (primary address) (map).

2010 Section Survey — Results

Question 1: As an AES member, please rate the activities in order of importance and/or value to you (1st, 2nd 3rd, etc.).

Question 2: How often would you most likely be able to attend Section meetings?

Question 3: What is your preference for day/evening of the week?

Question 4: What general Section activities are of the most interest to you (1st, 2nd, 3rd, etc.)?

  • Tours of area facilities (businesses, manufacturing, broadcasting, concert halls, recording studios, stadiums/arenas, worship facilities, etc.)
  • Presentations by manufacturers that highlight the technology, design and other criteria
  • Guest speakers – a variety of topics
  • Hands-on opportunities/demonstrations/training with equipment
  • Workshops – perhaps an occasional Saturday morning (or afternoon) session with a more structured plan (seminar, lecture, etc.)
  • Networking and social opportunities
  • A mix of all the above

Question 5: Primarily for those with full-time jobs – would your company consider allowing you to leave work early (say 3:30p or 4:00p), with pay (as a professional growth activity) to attend an AES event/meeting that were to begin by 4:00p or 4:30p?

Yes: 62.5%
No: 37.5%

Question 6: What is the best time for a meeting?

Late afternoon (4:00p, 4:30p or 5:00p): 25%
Evening (7:00p or 7:30p): 75%

Question 7: To what extent is travel to/from AES Section meetings a concern for you?

Question 8: What mileage/time factor (one-way) is reasonable?

Question 9: Would an occasional meeting in other locations (Ex., Bloomington, W Lafayette, Muncie, etc.) be reasonable for you to attend?

Yes: 94.74%
No: 5.26%

Question 9b: OR, should all meetings be in the Indianapolis metro area?

Yes: 10.53%
N0: 89.47%

Question 12: If, occasionally, we were able to provide live streaming for a meeting, would you be able and/or interested in watching and/or participating?

Yes: 90%
No: 10%

Question 12b: OR, is an in-person meeting generally the best experience?

Yes: 81.25%
No: 18.75%