Electro-Voice T221M Specifications

Description

The Electro-Voice T221M is a 400-watt, two-
way, high-efficiency floor monitor system. It
combines professional-quality components,
highlighted by the DH2T compression driver
and 400-watt, high-output 12-inch woofer.
The system may be biamplified or used full
range with the internal passive crossover.
Either way, the result is clear and articulate,
high-quality sound.
The enclosure is constructed of a void-free
3/4-in. 12-ply curved plywood shell which
is extremely rigid. The baffle and end pieces
are made from 13-ply birch plywood. This
high-strength enclosure is sprayed with a
resilient, textured black finish for a truly pro-
fessional appearance. The end-mounted,
heavy-duty, recessed handle makes trans-
portation easy and three rubber feet on the
opposite end help keep the finish looking
new.
The high-frequency section of the T221M
utilizes a compact 80° x 55° constant-direc-
tivity horn driven by a wide-bandwidth, two-
inch-titanium-diaphragm driver. The voice
coil is coupled to the diaphragm with EV's
exclusive Resonant Drive TM technology. This
increases and smooths the high-frequency
response and reduces the amount of internal
equalization required for flat frequency re-
sponse.
TM
EV's self-resetting PRO circuit is built into
the crossover network to guard the compres-
sion driver from damage. If input power to
the driver exceeds the nominal rating, the
PRO TM circuit is activated, reducing the
power delivered to the driver by 6 dB. The
system will remain in this mode of opera-
tion until input power is reduced to a safe
level.
The optimally vented bass section of the
T221M is designed using Thiele-Small pa-
rameters for efficient performance to below
100 Hz. The high-output 12-inch woofer
delivers outstanding performance. It features
beryllium copper lead wires with a low-mass,
edge-wound voice coil and high-temperature
materials. The coil is driven by a massive,
15-lb magnetic structure.

Frequency Response

The combination of a 12-inch woofer, DH2T
wide-bandwidth high-frequency driver and an
equalized crossover results in the wide and
smooth overall response shown in Figure 2.
The T221M's axial frequency response was
measured in Electro-Voice's large anechoic
T221M
Biampable, Compact,
Two-Way Floor Monitor
Speaker System
• C o n s t a n t - d i r e c t i v i t y 8 0 ° x 5 5 ° h o r n
w i t h 2 - i n c h t i t a n i u m d r i v e r
• High-output, 400-watt, 12-inch woofer
• Biamped or full-range operation-
simple biamp instructions included
inside the enclosure
• Rock-solid enclosure made with
12-ply curved plywood shell
TM
• PRO circuit provides HF driver
p r o t e c t i o n
• Professional Neutrik Speakon
connectors for biamp or full-range
o p e r a t i o n
chamber at a distance of 10 feet with a swept
sine-wave input of 4 volts. Figure 2 has been
averaged and corrected for 1 watt/1 meter,
half-space operation.

Directivity

The polar response of the T221M speaker
system at selected one-third-octave band-
widths is shown in Figure 1. These polar
responses were measured in an anechoic
environment at 20 feet using one-third-oc-
tave pink-noise inputs. The frequencies
selected are fully representative of the polar
response of the system. Beamwidth of the
system utilizing the complete one-third-oc-
tave polar data is shown in Figure 1. R
directivity index (D ) are plotted in Figure 4.
i

Biamping

The T221M may be easily converted for
biamp operation. To do this, first carefully
remove the crossover. Notice the instruc-
tions on the circuit board and the four-wire
"Molex" connector. The T221M comes from
the factory in passive (full-range) mode. To
convert the T221M to biamp operation, un-
plug the "Molex" connector from the header
marked "PASSIVE MODE (FULL
RANGE") and plug it into the header labeled
®
and
θ