Electro-Voice TL550D Quick Start Manual

Description and Applications
The Electro-Voice TL550D is a member of
the TL series of low-frequency enclosures.
The TL550D is a dual direct-radiating vented
design that provides high efficiency, low dis-
tortion and excellent low-frequency perfor-
mance in a compact enclosure. The TL550D
employs two long-throw EVX-150A 15-inch
loudspeakers, in an 8.4-ft 3 , black-finished
enclosure without grille. It is specifically
designed to meet the low-frequency demands
of digital cinema sound, in stage (behind-
the-screen) applications. The TL550D's high
pumping capability, high acoustic output
ability and extended bass response (40-Hz
3-dB-down point) make it particularly ap-
propriate for the dynamic potential of the
digital cinema application. The side-mounted
input panel facilitates behind-the-screen in-
stallation, where limited space between the
screen and the theatre wall often makes it
difficult to connect to the back of an enclo-
sure.
The TL550D's performance characteristics
also make it highly appropriate as the pri-
mary low-frequency source in extended-re-
sponse/high-output two-way speaker sys-
tems in a variety of other venues, including
auditoriums, theaters, performing arts cen-
ters, night clubs, concert halls and churches,
or as the subwoofer in large, multiway sys-
tems. In subwoofer use, the TL550D's 40-
Hz 3-dB-down point is appropriate for most
contemporary music playback and sound re-
inforcement. In the "step-down mode," the
TL550D's f is lowered to 28 Hz, which
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makes it appropriate for very-low-frequency
synthesized effects, down-tuned bass guitars,
and approaches the depths of the symphony
orchestra and pipe organ. (See Step-Down
section.)
The TL550D can be used with an externally
mounted XEQ-504 crossover/equalizer.
Thus, combined with appropriate Electro-
TM
Voice TransPlanar constant-directivity
high-frequency horns and DH1A, DH2A or
TL550D
Low-Frequency Speaker
System
• Designed for cinema stage use
(behind the screen)
• Extended, 40-Hz response (f
• Two EVX-150A woofers provide very
high peak and long-term output that
complements the dynamic potential
of digital sound on film
• Use as primary low-frequency
source in two-way systems or as
the sub-woofer in multiway systems
• 2,000 watts continuous program
• Side-mounted connection panel
facilitates hookup when depth
behind the screen is restricted
• 28-Hz f in step-down, ideal for
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very-low-frequency synthesized
effects, down-tuned bass guitars or
pipe organ
• Optional HS6 or HS7 hanging kits—
through-the-box steel tubes provide
safe suspension
N/DYM ® 1 compression drivers, the TL550D
forms passive two-way systems with unprec-
edented wide-range frequency response and
high linearity. To extract even greater per-
formance from the TL550D, a biamp con-
figuration using the Electro-Voice XEQ-2 or
XEQ-3 crossover/equalizer is recommended,
allowing full rated power to be applied to
the low-frequency system.
Two optional horn-mounting kits are avail-
able for the Electro-Voice HP940 and
HP9040 horns. (See High-Frequency Horn
Mounting section.)
Frequency Response
The TL550D's axial frequency response was
measured in Electro-Voice's large anechoic
chamber at a distance of 10 feet with a swept
sine-wave input of 4 volts. Figure 1 has been
averaged and corrected for 1 watt/1 meter.
)
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