Electro-Voice Q1212 User manual

Professional Power Amplifiers

Each new generation of Electro-Voice amplifiers inherits more
than 60 years of experience in amplifer design and manufacturing.
From the beginning, Electro-Voice has always considered the
audio quality of an amplifier to be as important as the output power
and reliability. An EV amp will do more than just work through the
toughest conditions; it will ensure your system sounds its best
while running safely.
In the 1990s, EV launched its Precision Series amplifiers. The
flagship P3000’s success was built upon its groundbreaking
headroom, accompanied by electrical and thermal stability under all
load conditions. Failure was literally not an option with the P3000.
As a vital part of the X-Array concert sound system, the P3000’s
performance was proven on the biggest world tours of the time,
including the Rolling Stones and AC/DC. Moving forward into the
21st century, the IRIS-Net-controlled P3000RL followed suit on
the largest tours and events of the era: LIVE8, Live Earth, Metallica,
Kenny Chesney, and Foo Fighters, to name a few.
As direct descendants of the legendary P3000, Q Series amps
take Electro-Voice’s unique amplifier design philosophy to a new
level of performance, power, efficiency, and value.
Electro-Voice Amplifiers
a heritage of power and performance

Innovative Class-H power
With Q Series’ efficient Class-H design, the permanent voltage rail is designed to cover the average music signal, rather
than permanently supplying the voltage for maximum output power. If dynamic peaks require a higher output voltage, the
voltage rail is switched to the maximum. This process saves up to 50% of the power consumption found in conventional
amplifier design, and results in a dramatic reduction in heat output. Q Series combines the sonic excellence and rugged-
ness of its Precision Series predecessors with Class-H innovation, all in a compact and affordable package.
Q1212
With 2 x 1200W @ 4 Ohms / 2x
1800W @ 2 Ohms, the Q1212 offers
the horsepower to challenge the legend-
ary P3000. It provides the same power
from a 2U case at modest weight, mak-
ing it a perfect subwoofer or high-power
top drive for Phoenix, Tour X, and ZX3/
ZX5 systems or system combinations.
Q99
With 2 x 900 Watts @ 4 Ohms /
2 x 1250W @ 2 Ohms, Q99 can
seriously serve as combined top &
sub drive for most club-sized systems,
such as Tour X or QRx.
Q66
A versatile workhorse, with 2 x 600W
@ 4 Ohms / 2 x 900W @ 2 Ohms.
Q66 has plenty of power to drive
a huge variety of speaker systems,
including Sx300, ZX4, Sb122, etc.
Q44
The base model, providing 2 x 450 W
@ 4 Ohms / 2 x 650W @ 2 Ohms.
An excellent choice for small tops and
utility loudspeakers, such as ZX1, Sx
Series, or EVID Series.

Audio Performance
While many people understand there are tremendous differences between professional
loudspeakers, many also tend to think that amplifiers are only differentiated by the amount
of output power they provide. Electro-Voice amplifiers serve to prove that there are also
audible differences...
Dynamic Headroom
Amplifier power and distortion figures are typically specified with sine wave signals. However, music signals are far more
dynamic than sine waves, comprising a pulsed wideband spectrum.
We at EV believe that, above all figures, the tonal performance of live music counts most; therefore, all of our amplifiers
are designed for dynamic headroom. This means that each and every EV amp has at least 30% more output capability for
short-term signals, when compared to a long-term sine wave value. This additional headroom results in an amp that will, for
example, allow for short term signal peaks of at least 780W when spec´d 600W.
While dynamic headroom is audible when playing music through a sound system, another specification to observe is the
increase in output power from an 8 Ohm load to 4 Ohms, and then down to 2 Ohms. Of course, all Electro-Voice amplifiers
are designed to be absolutely stable into loads of 2 Ohms.
Transient Response
When processing dynamic signals, other important criteria are signal speed and dynamic distortion. For example, kick drum
signals carry pulses of many frequencies as an overlay spectrum. Therefore, and in contrast to many other manufacturers, EV
specifies a lot more information on their amplifiers’ dynamic behavior than just “slew rate” figures. Important tests referring to
the amp´s ability regarding multitone signal pulses are expressed by IMD-SMPTE measurements at high power levels. And,
while IMD tests show the Intermodulation Distortion behaviour (how much “sound” is added by the amplifier), DIM30 is the
real spec for speed in an amplifier. All these tests are carried out in EV labs during an amplifier’s design phase, to ensure
maximum sonic performance. While these technical explanations appear very complex, they are clearly audible. Take a Q
Series amplifier and crank it up – you’ll hear the difference immediately!
Specified output power, mea-
sured with sine wave signal.
The dynamic headroom
designed into Electro-Voice
amplifiers allows maximum
dynamic response from music
signals, providing more punch
and power than other equally
spec’d amps
100%
30%
a
b
a
Sine wave and music signal on the output of an amplifier.
b

Protection Package & Dynamic Limiter
There are many good-sounding amplifiers available; however, for an amp to be considered the world’s best requires unparalleled
reliability in real-world applications.
Q Series amplifiers benefit from decades of professional amplifier design, and all the expertise that has made EV amps the
concert/touring standard is built into Q Series. Our complete protection package includes sophisticated circuits against
overheating, short circuit, DC output voltage, HF oscillation, back EMF (Electromotive Force), and destructive peak current.
Furthermore, Q Series amps also protect your valuable loudspeakers with built-in dynamic limiters, preventing dangerous
output clipping. The limiters immediately reduce amp gain when dynamic headroom is pushed to the limits at maximum output,
keeping distortion below 1% in a situation that can otherwise cause a signal to clip, which is often fatal for woofers and drivers.
Q-Series Amplifiers & Connectivity
Whatever application you choose, you can be sure your Q Series amp is prepared:
Both inputs have a paralleled loop thru XLR output to route signal to other amp inputs•
Besides the usual channel A & B outputs via Speakon connectors (on pin 1+/1-), output A carries the signal of•
channel B as well (on pin 2+ / 2-), providing an easy drive option for biamped speakers
Parallel & Bridge Mode option switches provide additional functionality with minimized cabling requirements•
An additional switchable LPN (Low-Pass Notch) filter provides extra tonal fundament and kick, with protective Low-•
Cut for using smaller passive 12” or 15” cabinets without additional subwoofers
Unclipped Signal Clipped Signal Dynamic Limiter Signal
Maximum output signal - input signal at input
sensitivity, THD<= 0.1%
Input signal 10dB above input sensitivity - clip-
ping output can destroy loudspeakers
Same 10dB above input sensitivity input signal
- the dynamic limiter keeps the THD to 1% max,
thus preventing the speakers from damage.
Maximum amp output signal

Amplifiers & Speaker Systems

Amplifiers & Speaker Systems Recommended System Setups
Speakers Q 44 Q 66 Q 99 Q1212
Sx80
Sx100+
Sx250
Sx300
Sb122
ZX1
ZX1 + Sb122
ZX3
ZX4
ZX5
TX1122FM
TX1122+Tx1181
TX1152FM
TX1152+Tx1181
TX2152
TX2181
PX2152
PX2152 (LF/HF)
Px2122 (LF/HF)
PX2181
PX1122M
PX1152M
QRx112
QRx115
QRx118S
QRx212
QRx153 (LF/MH)
QRx218S
requires DC-One Signal Processor
The above recommendations are for typical use, also depending upon cabling, number of cabinets used, etc.
High Freq.
High Freq.
Mid/High Freq
Low Freq.
Low Freq.
Low Freq.

Q-Series Amplifier Specifications Q44 Q66 Q99 Q1212
Maximum Midband Output Power
THD = 1%, 1 kHz, Dual Channel
650W/ 2 Ω
450 W/4 Ω
270 W 8 Ω
900W/ 2 Ω
600W/ 4 Ω
380W/ 8 Ω
1250W/ 2 Ω
900W/ 4 Ω
550W/ 8 Ω
1800W/ 2 Ω
1200W/ 4 Ω
750W/ 8 Ω
Rated Output Power
THD < 0.1%, 20 Hz...20 kHz
400 W/4 Ω
200 W 8 Ω
500 W/4 Ω
250 W/8 Ω
800 W/4 Ω
400 W/8 Ω
1100 W/ 4 Ω
550 W/ 8 Ω
Maximum Single Channel Output Power
Dynamic-Headroom, IHF-A
1150W/ 2 Ω
660W/ 4 Ω
350W/ 8 Ω
1700 W/ 2 Ω
950 W/ 4 Ω
480 W/ 8 Ω
2500 W/ 2 Ω
1400 W/ 4 Ω
700 W/ 8 Ω
3400 W/ 2 Ω
1800 W/ 4 Ω
950 W/ 8 Ω
Maximum Single Channel Output Power
Continuous, 1 kHz
850 W/ 2 Ω
540 W/ 4 Ω
310 W/ 8 Ω
1200 W/ 2 Ω
750 W/ 4 Ω
420 W/ 8 Ω
1700 W/ 2 Ω
1100 W/ 4 Ω
630 W/ 8 Ω
2400 W/ 2 Ω
1500 W/ 4 Ω
850 W/ 8 Ω
Maximum Bridged Output Power
THD = 1%, 1 kHz
1300 W/ 4 Ω
900 W/ 8 Ω
1800 W/ 4 Ω
1200 W/ 8 Ω
2800 W/ 4 Ω
1800 W/ 8 Ω
3600 W/ 4 Ω
2400 W/ 8 Ω
Maximum RMS Voltage Swing THD = 1%, 1 kHz 55.3 V 65.1 V 78.8 V 90.6 V
Power Bandwidth THD = 1%, ref. 1 kHz,
half power @ 4 Ω 10 Hz...30 kHz 10 Hz...30 kHz 10 Hz...30 kHz 10 Hz...30 kHz
Voltage Gain, ref. 1 kHz 32.0 dB 32.0 dB 32.0 dB 32.0 dB
Input Sensitivity, rated power @ 8 Ω, 1 kHz +2.2 dBu +3.1 dBu +5.1 dBu +6.6 dBu
THD at rated output power, MBW = 80 kHz, 1 kHz < 0.03%
IMD-SMPTE, 60 Hz, 7 kHz < 0.1%
DIM30, 3.15 kHz, 15 kHz < 0.05%
Maximum Input Level +21 dBu (8.69 Vrms)
Crosstalk, ref. 1 kHz, at rated output power < -80 dB
Frequency Response, ref. 1 kHz 10 Hz...40 kHz (±1 dB)
Input Impedance, active balanced 20 kΩ
Damping Factor, 1 kHz > 300
Slew Rate 25 V/μs 26 V/μs 27 V/μs 30 V/μs
Signal to Noise Ratio Amplifier, A-weighted > 106 dB > 107 dB > 109 dB > 110 dB
Output Noise, A-weighted < -71 dBu
Output Stage Topology Class AB Class AB Class H Class H
Power Consumption 1/8 maximum output power @ 4 Ω 550 W 700 W 700 W 850 W
Power Requirements 240 V, 230 V, 120 V or 100 V; 50 Hz...60 Hz (factory configured)
Protection Audio limiters, High temperature, DC, HF, Back-EMF, Peak current limiters, Inrush current limiters, Turn-on delay
Cooling Front-to-rear, 3-stage-fans
Ambient Temperatur Limits +5 °C...+40 °C (40 °F...105 °F)
Signal Processing LPN, switchable
Safety Class I
Dimensions (W x H x D), mm 483 x 88.1 x 421.5
Weight 12.6 kg (27.8 lbs) 14.8 kg (32.6 lbs) 16.3 kg (35.9 lbs) 17.7 kg (39.0 lbs)
Americas–
Headquarter Americas
Telex Communications, Inc.
12000 Portland Ave South,
Burnsville, MN 55337, USA
USA–Ph: 1-800-392-3497
Fax: [phone]
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Fax: [phone]
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Ph: 1-952-887-5532
Fax: [phone]
Europe, Africa & Middle-East
Headquarters EMEA
EVI Audio GmbH
Hirschberger Ring 45,
94315 Straubing, Germany
Phone: [phone],
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Parc de Courcerin,
Allée Lech Walesa,
F 77185 Lognes, France
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Headquarter Asia
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Pte Ltd
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Singapore 577180
Tel: [phone]
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Japan: EVI Audio Japan, Ltd
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Tokyo 156-0055
Tel: [phone]
Fax: [phone]
Hong Kong: Telex EVI Audio
(Hong Kong) Ltd.
Room 508-509, 5/F,
Topsail Plaza
11 On Shum Street
Shek Mun,Shatin HK
Phone: [phone],
Fax: [phone]
Shanghai: Telex EVI Audio
(Shanghai) Co., Ltd.
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Tower 1 Office Building,
218 Tian Mu Xi Rd.,
Shanghai, China
Postal Code: 200070
Tel: [phone]
Fax : [phone]
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