Electro-Voice Q44T User's Manual
Contents
1. Limited Warranty Electro Voice products are guaranteed against malfunction due to defects in mate tials 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 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 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 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 representatives2. There is easily readable nomen clature to ensure easily repeatable control settings The Electro 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 capable 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 swi
3. 10 REDUCE ME Pa CF RE OA BETON POOS DO MOT DPO TAR AP a FO BADOR MOTNE Specifications Conditions 1 OdBu 0 775 V rms 2 Dual mode ratings are for each w 120 volt ac line voltage maintained throughout testing Continuous Rated Output Power 45 20 000 Hz at less than 0 2 THD both channels driven per ELA RS 490 Dual Mode 4 Ohms 350 watts Bridged Mode Ohms 560 watts Dual Mode 8 Ohms 300 watts Transformer Isolated Outputs Dual Mode 350 watts at 25 V 70 V or 100V Transformer Isolated Outputs Bridged Mode 700 watts at 200 V 140 V or 50 V QAAT Stereo Power Amplifier Continuous Rated Output Power 1 kHz 1 THD both channels driven per EIA RS 490 Dual Mode 4 Ohms 450 watts Bridged Mode 8 Ohms 900 watts Dual Mode 8 Ohms 340 watts Transformer Isolated Outputs Dual Mode 410 watts at 100 V 400 watts at 70 V 390 watts at 25 V Transformer Isolated Outputs Bridged Mode 820 watts at 200 V 800 watts at 140 V 780 watts at 50 Y Maximum RMS Voltage Swing refer ence 1 kHz 1 THD Direct Outputs 44 Volts Transformer Isolated Outputs 125 Volts at 100 V 87 Volts at 70 V 31 Volts at 25 V Power Bandwidth 0 3 dB reference 1 kHz Any Mode 45 50 000 Hz at direct outputs 45 25 000 Hz at transformer isolated outputs channel both operating unless noted Frequency Response 0 3 dB reference 1 Khz 1 watt 45 30 000 Hz at direct outputs 45 22 000 H
4. S A Part Number 535129 9817
5. echo Voice pere Description The Electro 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 distortion 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 45 20 000 Hz In its transformer isolated dual mode it can deliver more than 350 watts into 25 70 7 or 100 volt lines In the bridged mode at 1 kHz the amplifier can deliver more than 900 watts into 8 ohms at less than 1 THD 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 Q44T 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 fans 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 devices are mounted to two large extruded aluminum heat sinks that are engi neered to minimize thermal gradients and allow the amplifier to operate safely into low impedance loads The output devices have a maximum junction tem
6. is avail able from Electro Voice Service at 600 Cecil Street Buchanan MI 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 li able 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 Electro Voice 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 form 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 a m to 5 00 p m Eastern Stan dard Time Specifications subject to change without notice QAAT Stereo Power Amplifier Figure 1 Front and Rear Panels Q44T Stereo Power Amplifier 483 mm 19 0 in ul Z2 G ww SZE poe eee Ss WARNING
7. nd output connectors for easy signal routing and hookup plifier clipping The limiter s action is con trolled by very sophisticated input output comparators which are designed to preserve the sonic integrity of the source The Q44T has electronically balanced XLR type and removable Phoenix Contact Euro style input connectors 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 Q44T s 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 25 70 7 and 100 volt outputs which may be used simultaneously To prevent ground loops from occurring the Q44T is equipped with a ground lift switch When the amplifier is operated in a rack with units of different ground potential the switch Q4AT Stereo Power Amplifier Q44T Stereo Power Amplifier may be adjusted to eliminate hum Separate dB scaled potentiometers on the rear panel of the QT allow easy regula tion of gain
8. perature 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 Q44T has sophisticated protection cir cuits that guard it and the load from prob lems Protection circuits guard against over load over temperature shorted outputs ra dio frequency interference and dc faults The output devices 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 saturation protection circuit that monitors the current demands of the transformer and can activate the limiters when the input signal reaches 20 dBu at any frequency The Q44T has built in limiters to protect speakers from the deleterious effects of am O44T Stereo Power Amplifier 280 watts per channel at 8 ohms 450 watts per channel at 4 ohms and 900 watts bridged at 8 ohms at 1 khz e 390 watts per channel at 25V 400 watts per channel at 70 7 volts and 410 watts per channel at 100 V e 780 watts at 50 V 800 watts at 140 V and 820 watts at 200 V in bridged mode e High performance audio limiters for freedom from clipping e Rear mounted dB scaled gain controls Can drive low impedance and constant voltage lines simulta neously e Detachable Phoenix Euro style input a
9. sfer Output Devices Total Number 16 devices P max Rating 250 watts 1_ collector current 16 amps de T max 200 C 392 F Controls and Switches Rear Two calibrated level controls input routing Dual Parallel chassis ground switch Grounded Ungrounded bridged mode switch Bridged Normal Front Power switch On Off Front Panel Indicators Two LED s per channel 4 total for signal present and limiter on protect indicator and power on Connections Input 3 pin female XLR type connectors for each channel in parallel with a removable 3 pin Phoenix Contact Euro style terminal block connector for easy signal routing The XLR connectors are wired according to the IEC 268 standard pin 1 shield pin 2 positive pin 3 negative Output Phoenix Contact Euro style terminal block connector KGS MSTB 2 5 12 for direct coupled and transformer isolated outputs for AWG 12 24 wire Power 16 gauge 3 wire IEC standard removable power cable Operating Voltage 120 230 240 V 50 60 Hz ac Power Consumption both channels operating in dual mode at 1 8 maximum output power at 4 ohms 690 watts Dimensions see Figure 1 Height 132 5 mm 5 25 in Width 483 mm 19 0 in Depth 385 5 mm 15 17 in Color Light gray Net Weight 45 2 lb 20 5 kg POWER AMPLIFIERS ElectroVoice 600 Cecil Street Buchanan MI 49107 616 695 6831 616 695 1304 Fax Telex Communications Inc 1998 Litho in U
10. tch 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 MSTB2 5 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 100 volt lines In bridged mode at 1 kHz the amplifier shall deliver 900 watts into 8 ohms 820 watts 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 132 5 mm 5 25 in high x 483 mm 19 0 in width x 385 5 mm 15 7 in deep Net weight shall be 20 5 kg 45 2 Ib Color shall be light gray The power amplifier shall be the Electro Voice Q44T
11. z at transformer isolated outputs Voltage Gain reference 1 kHz 34 dB at direct outputs 42 dB at 100V 39 dB at 70 V 30 dB at 25 V Input Sensitivity 1 kHz Dual Mode for 500 watts into 4 Ohms 0 dBu 775 mV Maximum Input Level reference 1 kHz 20 dBu 7 75 V 20 20 000 Hz Balanced 20 000 ohms Total Harmonic Distortion at rated output power measurement bandwidth 80 kHz reference 1 kHz lt 0 05 at direct outputs lt 0 1 at 100 V lt 0 2 at 70 V lt 0 3 at 25 V IMD SMPTE 60 Hz 7 kHz typical at rated power lt 0 08 at direct outputs lt 0 1 at 100 V lt 0 3 at 70 V lt 0 5 at 25 V DIM 30 composite square sine wave bandwidth limited to 30 000 Hz lt 0 03 at direct outputs lt 0 2 at 100 V lt 0 2 at 70 V lt 0 2 at 25 V Slew Rate Any Mode 25 V microsecond Damping Factor Any Mode at 100 Hz 1 kHz gt 300 gt 200 Signal to Noise Ratio gt 100 dB Amplifier Protection Audio limiters over temperature dc excessive hf excessive back EMF in rush current limiters shorted loads peak current limiters Load Protection Start up shutdown transients de fault infrasonic and ultrasonic filters Low ac line voltage nonlinear signal limiters transformer saturation protection Cooling System Front to rear airflow with two 3 speed fans Q4AT Stereo Power Amplifier Output Topology True complementary symmetry with ungrounded collectors no mica insulators for better heat tran
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