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Lecture Hall

Steep Tiered Seating

This is a space usually dedicated to lectures or small theatrical screenings. The seating area is sharply raised.

Smaller format lecture spaces can benefit from several different
approaches which have trade-off advantages:
 
Front Source [Left/Right]: Two sources spaced strategically create an acoustic “null” in the direct sound arriving to the center of the presentation area. Microphones in this area will benefit from increased GBF (Gain Before Feedback). Pay close attention to horn pattern selection to ensure that 
excess coverage does not reduce GBF for the presenter.
 
Two (2) IP600/800
(narrow horizontal coverage)
Two (mirror image) loudspeakers cover the entire space with the least number of loudspeakers
 
Suggested model families:
I SERIES (IP600/800) and V SERIES (V2-26, V2-28, V2-32, V2-35)
 
Distributed Source: To raise GBF and improve localization for most seats,
an array of two or three compact models addresses each of the two seating zones. This reduces the projection distances and the direct SPL projected onto the presenter’s area. It can also help with video projector paths, sight lines, and aesthetics.
 
Four to Six (4-6) IC600
Two to three compact models arrayed to cover each half (lower/ upper) of the seating sections 
 
Suggested compact model families:
I SERIES (IC600) and V SERIES (V2-6, V2-8, V2-26, V2-28)
 

AMPLIFIER

For maximum system performance and longevity, the loudspeakers must be properly powered to achieve the needed sound pressure level (SPL) in the listening area.  Refer to the product spec sheets for appropriate amplifier ratings.

PROCESSING AND PROTECTION

To properly process, equalize and protect the loudspeaker systems, it is recommended to use the Community dSPEC226 digital signal processor.

Some amplifiers have built-in processing which may be adequate when properly programmed. Community's suggested DSP settings can be found HERE.

All of the loudspeakers require an electronic high pass filter for protection against over-excursion from bass-heavy program material.

Loudspeaker protection on the dSPEC226:
Protection is handled by three stages of protective limiters: these include a short-term peak limiter to prevent over-excursion of drivers and to control amplifier clipping; a mid-term RMS limiter that prevents system overdrive; and a unique long-term power monitor that works to protect your loudspeakers from long-term thermal damage.  All three limiters operate interactively, providing unique driver protection, while allowing each loudspeaker’s full dynamic range to be utilized without compromise.

 

WIRING

When considering the distance between the amplifier and the loudspeaker(s), the following minimum cable gauges are suggested.

Less than 50 feet: 14 AWG
50 to 100 feet: 12 AWG
100 to 250 feet: 10 AWG

It is strongly recommended that all loudspeaker level wire be stranded, twisted and never shielded. Loudspeaker wires should not be connected to earth ground or supporting structures.

 

TECH SUPPORT

For technical and applications assistance, please contact the Community TAG Team (Technical Applications Group) at 1+(610) 876-3400 or tagteam@communitypro.com.

 

DESIGN GUIDE

To view the entire Presentation & Performance Loudspeaker System Design Reference Guide, click HERE.