Electro voice q 44 t brochure

Page 1

Elechol/oice _

Dau-iption

The Electra-Voice Q44T amplifier is a very
high-quality power amplifier designed to
elicit excellent performance from any
speaker system as well as 25V. 70.7V and
100V lines. Its low distorn'on and substan-
tial headroom ensure that program material
will be accurately amplified.

Each channel of the Q44T delivers more
than 230 watts continuous average power
into 8 ohms and 350 watts into 4 ohms
over a frequency range of 4S - 20,000 Hz.
In its transformer-isolated dual mode, it can
deliver more than 350-watts into E, 70.7 or
100-voltlincs. In the bridged mode at 1 kHz,
the amplifier can deliver more than 900 watts
into 8 ohms at less than 1% THE). Both di-
rect and transformer-isolated outputs may be
used simultaneously. The well-designed
power supply with its large toroidal trans-
former gives the amplifier impressive head-
room and current output.

The 0441 contains 16 high-power output
devices with 4,000 watts of dissipation ca-
pability. These devices are protected from
overheating by two, three-speed tempera-
ture-sensitive films. The fans are quiet enough
to permit use of the Q44T in noise-sensitive

applications such as recording studios and
houses of worship.

The output devioesare mounted totwo large,
extruded aluminum heat sinks that are engi-
neered to minimize thermal gradients and
allow the amplifier to opnate safely into low-
impedanoe loads The output devices have a
maximum junction temperature of 200° C
(392° F), so high operational temperatures
present no problems. The output devices are
mounted directly to the heat sinks without
mica insulators to ensure better dissipation
of heat.

The 0441' has sophisticated protection cir-
crtitsthatguarditandtheloadfiomprob-
lems. Protection circuits guard against over-
load, over-temperature, shorted outputs, ra-
dio-frequency interference and dc faults The
output devics are protected against damage
from the reverse feeding of electrical energy
(back EMF) from the load and are switched
on via relays to avoid transients which could
damage speakers. There is also a transformer
saturan'on protection circuit that monitors the
cruretrt demands of the transformer and can
activate the limiters when the input signal
reaches +20 dBu at any frequency.

The 0441' has builtdn limiters to protect
speakers from the deleterious efiects of am-

044T

Stereo Power Amplifier

23!] watts per channel at 8 ohms,
450 watts per channel at 4 ohms and
900 watts bridged at 8 ohms at 1 khz

- 390 watts per channel at 25V.
400 watts par channel 3170.7 volts
and 410 watts per channel at 100 V

- 780watts at5th, mflwatts mum
and 820 walls at 200 V in bridged
mode

0 High-periormance audio limiters lor
treedom horn clipping

- Bear-mounted dB-soaled pain
controls

0 Ban drive low-impedance and
constant-voltage lines simulta-
neously

0 Detachable Phoenix 'Euro-s'lyle' input
and output connectors for easy signal
routing and hookup

plifier clipping. The limiters action is con-
trolled by very sophistitzted input/output
comparators which are designed to preserve
the sonic integrity of the source.

The 0441 has electronically-balanced XLR-
type and removable Phoenix Contact Euro-
style" input oomectors in parallel that allow
easy, problem-free connections and signal
routing. The amplifier has an input routing
switch that allows selection of either normal
dual-channel operation or parallel mono op-
eration, which routes an input to both chan-
nels but still allows independent level con-
trol. Optional input transformers may be
added to the amplifier to provide for even
greater immunity from interference.

The Q44Ts Phoenix Contact Euro-style
removable output connector provide sturdy,
reliable connections and allow use of heavy
wire for loss-free signal transmission. There
are easily identifiable connections for the
direct outputs and for the transformer-iso-
lated 75, 70.7 and loo-volt out-puts which
may he used simultaneously.

To prevent ground loops from occurring, the
0441 is equipped with a ground-lift switch.
When the amplifier is operated in a rack with
units of different ground potential, the switch

Page 2

Q44T Stereo Power Ampllfler

Q44T Stereo Power Amplifier

may be adjusted to eliminate hum.

Separate dB-scaled potentiometets on the
rear panel of the Q44T allow easy regula-
tion of gain. There is easily readable nomen-
clature to ensure easily repeatable control
settings.

The Electra-Voice Q44T is an excellent
choice for high-quality professional sound
system applications which require excellent
sound quality, speaker protection and the
highest level of construction quality and
long~term reliability.

Architects and Engineers
Specifications

The power amplifier shall be a dual-channel
model of solid-state design employing high-
power output devices Gpable of driving con-
ventional loudspeaker loads and also 25 -
100 volt lines. It shall be capable of operat-
ing from a 120/220/240-V, 50/60 Hz ac line.
The power amplifier shall meet many world-
wide product safety requirements including
Underwriter s Laboratories UL-813 stan-
dard, Canadian Standards and CE standards.
The power amplifier shall contain a limiter
circuit driven by a high-quality input/output
comparator to protect the load from damage
by amplifier clipping. The amplifier shall
contain sensing circuitry to provide protec-
tion for the output transistors against over-
temperature, excessive output voltage,
shorted loads, excessive phase shift and
back-EMF current. The load shall be simi-
larly protected against start-up/shutdown
transients, low ac line voltage and dc.

Rear-mounted controls shall include detented
dB-scaled level potentiometers for each
channel, an input routing switch for select-
ing dual/stereo or parallel mono operation,
a switch for selecting dual/stereo or bridged
operation and a chassis groundlift switch.
Rear-mounted input connectors shall include
a 3-pin female XLR-type connector wired
in parallel with a removable Euro-style
connector block for signal routing. The out»
put connector shall be a removable Euro-
style Phoenix Contact #KGS-MSTB25/12
connector.

Front-panel indicators shall include power
on, a protection indicator and separate sig-
nal present and limiter indicators for each
channel. Front-panel controls shall include
a power on switch.

The power amplifier shall meet the follow-
ing performance specifications: rated output
power from 20-20,000 Hz at less than 0.2%
THD, each channel 230 watts into 8 ohms,
350 watts into 4 ohms as well as 25, 70 or
loo-volt lines; in bridged mode at 1 kHz, the
amplifier shall deliver 900 watts into 8 ohms,
820 wars into 200 V, 800 watts into 140 V,
and 780 watts into 50 V; THD (total har~
monic distortion) shall be less than 0.05% at
1 kHz at rated output power at 8 and 4 ohms,
0.1% at 100 volts, 0.2% at 70 volts and 0.3%
at 25 volts; transient intermodulation distor-
tion (DIM 30), shall be less than 0.03% at
8 and 4 ohms, 0.1% at 100 volts, 0.3% at
70 volts and 0.5% at 25 volts . Dimensions
shall be 1325 mm (5.25 in) high x 483 mm
(19.0 in) width x 385.5 mm (15.7 in) deep.
Net weight shall be 205 kg (45.2 lb). Color
shall be light gay.

The power amplifier shall be the Electro«
Voice Q44T.

Limited Warranty

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
statemenr(s) below, or in the individual prod
uct data sheet or owners 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. Ex-
clusions 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-
uCI data sheet or owners manual; (c) mal-
function resulting trom use or operation of

the product other than as specified in the
product data sheet or owners manual; (d)
malfunction resulting h'om 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 Service or any of its authorized service
representatives. Obtaining Warranty Ser-
vice: To obtain warranty service, a customer
must deliver the product, prepaid, to Elec-
tro-Voice Service or any of its authorized
service representatives together with proof
of purchase of the product in the form of a
bill of sale or receipted invoice. A list of
authorized service representatives is avail-
able fi'om Electro-Voice Service at 600 Cecil
Street, Buchanan, Ml 49107 (800/234-6831
or FAX 616/695-4743). Incidental and
Consequential Damages Excluded: Prod-
uct repair or replacement and return to the
customer are the only remedies provided to
the customer. Electro-Voice shall not be 1i-
ahle for any incidental or consequential dam-
ages including, without limitation, injury to
persons or property or loss of use. Some,
states do not allow the exclusion or limita-
tion of incidental or consequential damages
so the above limitation or exclusion may not
apply to you. Other Rights: This warranty
gives you specific legal rights, and you may
also have other rights which vary from state
to state.

Electm-Volce Electronics are guaranteed
against malfunction due to defects in mate-
rials or workmanship for a period of three
(3) years from the date of original purchase.
Additional details are included in the Uni-
for-m Limited Warranty statement.

For warranty repair or service informa-
tion, contact the service repair department
at: 616/695-6831 or 800/685-2606.

For technical assistance, contact Technical
Support at 800/234-6831 or 616/695-6831,
M-F, 8:00 am. to 5:00 pm. Eastern Stan-
dard Time.

Specifications subject to change without
notice.