Electrovoice sl12-2v Specification Guide

The Electro-Voice SL12-2V is a 15°

 

slanted

baffle two-way, high-efficiency speaker

system. Its primary intended application

is for high-quality surround sound in me-

dium and large premium cinema installa-

tions. It has been designed for high-power

digital surround sound requirements us-

ing high-quality, professional-level com-

ponents such as a high-frequency 100° x

90° horn/driver and 12-inch woofer.  The

sleek black-vinyl enclosure with a black

cloth grille attached with four screws has

been to blend into most interior design

concepts. A third-order (18-db-per-oc-

tave) crossover at 1,600 Hz is used to com-

bine the two frequency sections and pro-

vide the system equalization while achiev-

ing the best directivity response both on

and off axis.

The SL12-2V axial frequency response was

measured in Electro-Voice's large anechoic

chamber at a distance of 10 feet with a swept

sine-wave input , corrected to 1 watt 1 Meter

(see Figure 4). The two responses, ISO 2969

and "flat" are illustrated.

The directional characteristics of the SL12-

2V wawe measured in Electro-Voice's large

anechoic chamber. The test signal was one-

third-octave pink noise at the frequencies

indicated. A full spherical measurement

system was used. All directional informa-

tion was measured at 20 feet. Figure 8  il-

lustrates the horizontal and vertical polar

responses. Figure 6 shows the horizontal

and vertical bandwidths. Beamwidth is the

angle at which the horizontal and vertical

polar responses have decrease in level by

6dB when compared with the axial fre-

quency response.

Figure 7 illustrates the total directivity of

the SL12-2V. The directivity factor R

q

(Q) is

the relative value, at a point, of an ideal

spherical response. The directivity index,

D

i

 = 10log

10

R

q.

Electro-Voice components and systems are

manufactured to exacting standards, en-

suring they will hold up, not only through

______________________
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®

 is a registered trademark of Lucasfilm Ltd.

the most rigorous of power tests, but also

through continued use in arduous, real-

life conditions. The EIA Loudspeaker

Power Rating Full Range (EIA RS-426-A

1980) uses a noise spectrum which mimics

typical music and test the thermal and me-

chanical capabilities of the components.

Electro-Voice will support relevant addi-

tional standards as and when they become

available. Extreme, in-house power test,

which push the performance boundaries

of the system, are also performed and

passed to ensure years of trouble-free

service.

Specifically, the SL12-2V passes EIA RS-

426-A 1980 with the following values.

R

SR

= (1.15 x R

E

  ohms) ,  R

E

 = 7.1 ohms

P

E(MAX)

 =200 watts

Test voltage =  square root of PE

(MAX)

 x R

SR

   

                     = 40.4  volts  rms.

                      = 80.8  volts peak

The "peak power-handling capacity of a

woofer is determined by the peak test volt-

age amount. For the SL12-2V, a 80.8-volt

peak test voltage translates into an 800-

watt short-term-peak power-handling ca-

pacity. This is the equivalent of four times

the "average" power-handling capacity,