Electro-Voice T221M User manual

T221M
Biampable, Compact,
Two-Way Floor Monitor
Speaker System
• Constant-directivity 80° x 55° horn
with 2-inch titanium driver
• 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
• PROTM circuit provides HF driver
protection
• Professional Neutrik Speakon®
connectors for biamp or full-range
operation
Description
TheElectro-VoiceT221Misa400-watt,two-
way, high-efficiency floor monitor system. It
combines professional-quality components,
highlightedby 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 atruly 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-
tivityhorn driven by a wide-bandwidth, two-
inch-titanium-diaphragm driver. The voice
coil is coupled to the diaphragm with EV’s
exclusiveResonantDriveTM technology.This
increases and smooths the high-frequency
response and reduces the amount of internal
equalization required for flat frequency re-
sponse.
EV’s self-resetting PROTM 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
PROTM 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
deliversoutstandingperformance. Itfeatures
berylliumcopperleadwireswithalow-mass,
edge-woundvoice coil and high-temperature
materials. The coil is driven by a massive,
15-lb magnetic structure.
Frequency Response
Thecombination of a 12-inchwoofer, DH2T
wide-bandwidthhigh-frequencydriverandan
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
chamber at adistanceof 10feet 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. Rθand
directivity index (Di) are plotted in Figure 4.
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 headerlabeled

T221M Biampable, Compact, Two-Way Floor Monitor Speaker System
T221M Biampable, Compact, Two-Way Floor Monitor Speaker System
“BIAMP”. The crossover is now in biamp
mode. Carefully replace the crossover and
screws. When the crossover is in biamp
mode, there is an 18-microfarad capacitor
in series with the high-frequency driver for
protection against DC voltages or amplifier
failure. This is not a crossover. It is how-
ever, protection against some forms of am-
plifier failure. An active crossover with a
crossover frequency of 1,600 Hz (1.6 kHz)
with slopes of 12 dB per octave or greater is
required. Whenever possible, a crossover
with 24-dB-per-octave slopes should be
used.
Note: The PROTM circuit is still protecting
the high-frequency driver when the system
is in biamp mode.
Connections
The T221M is equipped with Neutrik
Speakon®NL4MPR connectors. Two con-
nectorsare installed in parallel, one mounted
on each end of the enclosure allowing
multiple T221M’s to be used and “daisy-
chained”together. These NL4FC connectors
are used because they are locking, self-po-
larizing and capable of 30 amps rms con-
tinuously.
Full-range pin arrangements are:
1– = IN, FULL RANGE(–)
1+ = IN, FULL RANGE(+)
2– = Not used
2+ = Not used
Biamp pin arrangements are:
1– = IN, LOW FREQUENCY (–)
1+ = IN, LOW FREQUENCY (+)
2– = IN, HIGH FREQUENCY (–)
2+= IN, HIGH FREQUENCY(+)
If you experience any difficulty in obtain-
ingcables, connectors or wiringaccessories,
the following companies can be contacted:
Neutrik USA, Inc.
1600 Malone Street
Millville, NJ 08332
Pro Co Sound, Inc.
135 E. Kalamazoo Avenue
Kalamazoo, MI 49007
WhirlwindMusicDistributors,Inc.
P.O. Box 1075
Rochester, NY 14603
Power-Handling Capacity
To our knowledge, Electro-Voice was the
first U.S. manufacturer to develop and pub-
lish a power test closely related to real-life
conditions. First, we use a random-noise in-
put signal because it contains many frequen-
cies simultaneously, just like real voice or
instrument program. Second, our signal con-
tains more energy at extremely high and low
frequenciesthantypicalactual program, add-
ing an extra measure of reliability. Third, the
test signal includes not only the overall
“long-termaverage”or “continuous” level—
which our ears interpret as loudness—but
also short-duration peaks which are many
times higher than the average, just like ac-
tual program. The long-term average level
stresses the speaker thermally (heat). The
instantaneouspeaks test mechanical reliabil-
ity (cone and diaphragm excursion). Note
that the sine-wave test signals sometimes
usedhave a much less demanding peak value
relative to their average level. In actual use,
long-term average levels exist from several
seconds on up, but we apply the long-term
average for several hours, adding another
extra measure of reliability.
Specifically, the T221M is designed to with-
stand the power test described in EIA Stan-
dard RS-426A. The EIA test spectrum is
applied for eight hours. To obtain the spec-
trum, the output of a white-noise generator
(white noise is a particular type of random
noisewithequalenergyper bandwidth in Hz)
is fed to a shaping filter with 6-dB-per-oc-
tave slopes below 40 Hz and above 318 Hz.
When measured with an analyzer having the
usual constant-percentage bandwidth (one-
third octave), this shaping filter produces
a spectrum whose 3-dB-down points are
at 100 Hz and 1,200 Hz with a 3-dB-per-
octave slope above 1,200 Hz. This shaped
signal is sent to the power amplifier with the
continuous power set at 400 watts into the
5.98-ohm EIA equivalent impedance
(48.9 volts true rms). Amplifier clipping
sets instantaneous peaks at 6 dB above the
continuous power, or 1,600-watts peak
(97.8 volts peak). This procedure provides a
rigorous test of both thermal and mechani-
cal failure modes.
Architects' and Engineers'
Specifications
The loudspeaker system shall be a two-way,
full-range design consisting of a 305-mm
(12-inch) woofer in a vented enclosure, a
high-frequencycompression driver mounted
on a 80° x 55° constant-directivity horn, and
apassivecrossover/equalizernetwork,which
may be bypassed for use with an external
low-level active dividing network with a
corner frequency of 1,600 Hz. The loud-
speaker shall meet the following perfor-
mance criteria: frequency response of
100-16,000 Hz, –3 dB; full-range power
handling of 400 watts long term and 1,600-
watts short term with a shaped random-noise
input per EIA Standard RS-426A; low-fre-
quency power handling below 1,600 Hz in
the biamp mode of 400-wattslong term and
1,600-watts short term with a shaped ran-
dom-noise input per EIA Standard RS-426A;
high-frequency power handling above
1,600 Hz in the biamp mode of 60-watts
long term and 240-watts short term with a
shapedrandom-noiseinputper EIA Standard
RS-426A;sensitivity of101dB SPLat1 meter
with a 1-watt, 300- to 3,000-Hz pink-noise
input; 6-dB-down horizontal coverage angle
of 55° ±5° in the 5,000- to 16,000-Hz range;
6-dB-down vertical coverage angle of 80°
±5° in the 5,000- to 16,000-Hz range; cross-
over frequency of 2,600 Hz (electrical);
nominal impedance of 8 ohms; and mini-
mum impedance of 6.7 ohms. Input con-
nections shall be two paralleled Neutrik
Speakon®NL4MPR connectors for full-
range and biamp operation. The enclosure
shall be constructed of curved plywood,
covered with black textured paint and fit-
ted with a 16-gauge black steel grille, rub-
ber feet and a recessed carrying handle. Di-
mensions shall be 371 mm (14.62 in.) high x
594 mm (23.4 in.) wide x 406 mm (16.0 in.)
deep. Net weight shall be 22.3 kg (49 lb).
Theloudspeaker system shall bethe Electro-
Voice T221M.

T221M Biampable, Compact, Two-Way Floor Monitor Speaker System
T221M Biampable, Compact, Two-Way Floor Monitor Speaker System
WARRANTY (Limited)
Electro-Voice products are guaranteed
against malfunction due to defects in mate-
rials or workmanship for a specified period,
as noted in the individual product-line
statement(s)below,or in the individual prod-
uct data sheet or owner’s manual, beginning
with the date of original purchase. If such
malfunction occurs during the specified pe-
riod, the product will be repaired or replaced
(at our option) without charge. The product
will be returned to the customer prepaid.
Exclusions and Limitations: The Limited
Warranty does not apply to: (a) exterior fin-
ish or appearance; (b) certain specific items
described in the individual product-line
statement(s)below,or in the individual prod-
uct data sheet or owner’s manual; (c) mal-
function resulting from use or operation of
the product other than as specified in the
product data sheet or owner’s manual; (d)
malfunction resulting from misuse or abuse
of the product; or (e) malfunction occurring
at any time after repairs have been made to
the product by anyone other than Electro-
Voice or any of its authorized service repre-
sentatives. Obtaining Warranty Service:
To obtain warranty service, a customer must
delivertheproduct, prepaid, to Electro-Voice
or any of its authorized service representa-
tives together with proof of purchase of the
product in the form of a bill of sale or re-
ceipted invoice. A list of authorized service
representatives is available from Electro-
Voice at 600 Cecil Street, Buchanan, MI
49107 (616/695-6831 or 800/234-6831).
Incidental and Consequential Damages
Excluded:Productrepairorreplacementand
return to the customer are the only remedies
providedto the customer.Electro-Voiceshall
notbe liable for any incidental orconsequen-
tial damages including, without limitation,
injury to persons or property or loss of use.
Some states do not allow the exclusion or
limitation of incidental or consequential
damages so the above limitation or exclu-
sion may not apply to you. Other Rights:
Thiswarranty gives you specific legalrights,
and you may also have other rights which
vary from state to state.
Electro-Voice Speakers and Speaker Sys-
temsareguaranteedagainst malfunction due
to defects in materials or workmanship for a
periodoffive (5) years from the date of origi-
nalpurchase. The Limited Warrantydoesnot
apply to burned voice coils or malfunctions
such as cone and/or coil damage resulting
from improperly designed enclosures.
Electro-Voice active electronics associated
with the speaker systems are guaranteed for
three (3) years from the date of original pur-
chase. Additional details are included in the
Uniform Limited Warranty statement.
Service and repair address for this product:
Electro-Voice, Inc., 600 Cecil Street,
Buchanan, Michigan 49107 (616/695-6831
or 800/234-6831).
Specifications subject to change without
notice.
Figure 1—T221M Polars HORIZONTAL
VERTICAL 5 dB per division

T221M Biampable, Compact, Two-Way Floor Monitor Speaker System
T221M Biampable, Compact, Two-Way Floor Monitor Speaker System
Figure 2—T221M axial frequency
response, 1 watt, 1 meter
Figure 3—T221M Beamwidth
HORIZONTAL
VERTICAL 5 dB per division

T221M Biampable, Compact, Two-Way Floor Monitor Speaker System
T221M Biampable, Compact, Two-Way Floor Monitor Speaker System
Figure 4—T221M Directivity
Figure 5—T221M distortion 10%, 40 W
at 10 ft
Figure 5—T221M Dimensions

T221M Biampable, Compact, Two-Way Floor Monitor Speaker System
T221M Biampable, Compact, Two-Way Floor Monitor Speaker System
SPEAKERS—Monitors Part Number 534035— 9728
600 Cecil Street, Buchanan, MI 49107
616/695-6831, 616/695-1304 Fax
Specifications
Frequency Response, 1 Watt/1 Meter
on Axis, Swept Sine-Wave Input, Half-
Space Environment (see Figure 2):
100-16,000 Hz
Low-Frequency 3-dB-Down Point:
100 Hz
Usable Low-Frequency Limit (10-dB-
down point):
70 Hz
Half-Space Reference Efficiency:
5.7%
Long-Term Average Power-Handling
Capacity per EIA Standard RS-426A
(see Power-Handling Capacity
section),
Full Range:
400 watts
Low Frequency:
400 watts
High Frequency:
60 watts
Maximum Woofer Acoustic Output:
22.8 watts
Sound Pressure Level at 1 Meter,
1 Watt Input, Anechoic Environment,
Band-Limited Pink-Noise Signal,
300-3,000 Hz:
101 dB
Dispersion Angle Included by 6-dB-
Down Points on Polar Responses,
Indicated One-Third-Octave Bands of
Pink Noise,
5,000-16,000 Hz, Horizontal (see
Figure 3):
55° ±5°
5,000-16,000 Hz, Vertical (see Figure 3):
80° ±5°
Directivity Factor Rq (Q), 800- to
16,000-Hz Median (see Figure 4):
9.7 (+5.1, –5.2)
Directivity Index Di, 800- to 16,000-Hz
Median (see Figure 4):
9.5 dB (+2 dB, –1.5 dB)
Distortion, 0.1 Full Power Input,
Second Harmonic,
100 Hz:
2.6%
1,000 Hz:
1.0%
10,000 Hz:
7.9%
Third Harmonic,
100 Hz:
1.8%
1,000 Hz:
2.8%
10,000 Hz:
1.4%
Transducer Complement,
High Frequency:
DH2T driver; HP85M horn
Low Frequency:
High-power woofer (12 in.)
Box-Tuning Frequency:
70 Hz
Crossover Frequency (electrical):
2,600 Hz
Crossover Slope:
12 dB per octave (low frequency)
18 dB per octave (high frequency)
Impedance,
Nominal:
8 ohms
Minimum:
6.7 ohms
Input Connections:
Two paralleled Neutrik Speakon®
NL4MPR connectors for full-range or
biamp operation
Enclosure Materials and Colors:
Black-texture painted 12- and 13-ply
plywood
Dimensions, overall (in floor monitor
position),
Height:
371 mm (14.62 in.)
Width:
594 mm (23.4 in.)
Depth:
406 mm (16.0 in.)
Net Weight:
22.3 kg (49 lb)
Shipping Weight:
25.5 kg (56 lb)
©EVI Audio, 1997 • Litho in U.S.A.