amplifier 20 "6 3 mm"
ARCH & ENG SPECS
QTU1400
ARCHITECTS’ & ENGINEERS’ SPECIFICATIONS
OVERVIEW
The power amplifiers shall be a four-channel model with a switch mode
universal power supply with Power Factor Correction and switch mode fixed
frequency class D output circuit topology with constant voltage insulated
output at 50, 70 or 100V thanks to four internal transformers.
The amplifier shall have four auxiliary line inputs for emergency messages,
activated by four 24V auxiliary command inputs.
The amplifier shall be provided with an internal speaker and an headphone
amplifier for listening to each of the four input or output channels.
The amplifier shall be able to be equipped with optional sensing and
communication board, on RS485 bus, providing full monitoring and control
through proprietary software running on an external PC.
POWER OUTPUT SPECIFICATIONS
The amplifier shall exhibit the following power output performance, rms
(1KHz @ 0,5% THD):
4 x 350 Wrms/500 W program @ 50V with minimum impedance of 7,14
Ohm;
4 x 350 Wrms/500 W program @ 70V with minimum impedance of 14
Ohm;
4 x 350 Wrms/500 W program @ 100V with minimum impedance of 28,5
Ohm.
AUDIO SPECIFICATIONS
The amplifier shall have:
- input impedance: 10K Ohm;
- input type: balanced;
- detachable mains power cord set supplied with amplifier with IEC 16A on
amplifier side and Schuko plug for EU and rest of the world, American 3 pin
15A for USA.
PROTECTION CIRCUITS SPECIFICATIONS
The amplifier shall be equipped with the following protection circuits:
- AC protection: shuts down the power supply if the line voltage is outside
the operating voltage (up to 290V AC mains tolerant). Internal varistor
protects anyway for mains over 290V containing damages to internal
circuits;
- turn on/off muting: for about 4 seconds after turn on, and soon after turn
off, the amplifier outputs are muted;
- clip limiter: prevents severely clipped waveforms from reaching the
loudspeakers, whilst maintaining full peak power;
- DC protection: protects against infrasonic signals at the outputs, DC or
very low frequencies that could damage loudspeakers;
- VHF protection: protects the loudspeakers against strong, very high
frequency, non-musical, signals above the audible range;
- long term limiter: “protect” red leds light when it is started the output
tension reduction due to steady long term rms signals (not musical signals
but sinus, feedback, etc.), preventing damage to loudspeakers;
- short circuit protection: “protect” red leds light in case of possible short
circuit or other stressful events for the output circuits. This protection will
reset automatically when the short circuit conditions are removed;
- thermal protection: “protect” red leds light when heat sinks reach 60°C
(140°F), at 75°C (167°F) thermal sensing circuit will mute both channels,
they will un-mute automatically when temperature fall under 65°C (149°F).
FRONT PANEL FEATURES
- voltage gain: 34 dB @ 50V, 37 dB@70V, 40dB@100V;
- input sensitivity: 1,58 Vrms/6,19 dBU;
The amplifier front panels shall include:
- maximum input level: 3,5 Vrms/13,10 dBu;
- push on/push off mains power switch;
- frequency response (100V @ 28,5 Ohm): 50Hz-20KHz (0/-3 dB);
- four detect gain reduction knob, one for each output channel;
- damping Factor: >600 @100 Hz;
- two 5 led bars, one for each channel, with 3 green leds, 1 yellow and 1 red
each;
- slew Rate (100V @ 28,5 Ohm): 30V/us (input filter bypassed);
- S/N Ratio (20Hz-20KHz A weighted) in dB: >105 dB;
- THD+N: <0,5% from 1W to full power (typically <0,1%);
- SMPTE IMD: <0,5% from 1W to full power (typically <0,1%);
- DIM30 IMD: <0,5% from 1W to full power (typically <0,01%);
- crosstalk > 70 dB @ 1 Khz.
POWER SUPPLY & COOLING SPECIFICATIONS
The amplifier shall have an universal switch mode power supply with Power
Factor Correction with one, microprocessor temperature controlled,
continuously variable speed fan, front-to-back airflow.
The amplifier shall exhibit the following performances:
- four green leds, one for each channel, marked as “signal” that will light
when input signal reach -66dBV;
- four red leds, one for each channel, marked as “protect” that will light when
the channel will be in a protection status;
- four green leds, one for each channel, marked as Monitor in, that will light
when the input signal of the corresponding channel is selected from
headphone monitoring output;
- four green leds, one for each channel, marked as Monitor out, that will light
when the output signal of the corresponding channel is selected from
headphone monitoring output;
- two green leds, one for each couple of channels, marked as “ready” that
will light when amplifier is on;
- minimum voltage for power up: 90 V;
- two yellow leds, one for each couples of channels, marked as “temp” that
will light when temperature will reach 70°C (158°F), 5°C (41°F) before the
protection circuit will mute outputs;
- power factor cos (ϕ): more than 0,95% from 200 W to full output power;
- one detect headphone output level monitor knob;
- required AC mains: universal AC input 95-265 V, 50/60 Hz;
QTU1400_A&E_SPECS_0608_EN
www.powersoft-audio.com
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QTU1400
Architects’ & Engineers’ Specifications
- one push button for selecting headphone/internal speaker monitoring
source;
- four 4 poles (5,08 mm) MSTB 2,5/4-ST-5,08 Phoenix© type connectors for
channel 1/2/3/4 floating insulated outputs for 50V, 70V, 100V and ground;
- one 6,3 mm (1/4 in) jack output for headphone;
- recessed channel 1/2 link to channel 3/4 auxiliary 24V command switch;
- one removable dust filter cover.
- recessed channel 1/2 link to channel 3/4 auxiliary line input switch;
REAR PANEL FEATURES
- one cooling fan outlet.
PHYSICAL SPECIFICATIONS
The amplifier rear panel shall include:
- IEC 16A mains detachable connector, amplifier provided with power cord
set with IEC16A on amplifier side with cable 3G1,0mmq and Schuko plug for
Eu and rest of the world and with cable 3x16AWG and American 3 pin 15A
plug for USA;
The amplifier shall comply with EIA standard 19 in. rack (EIA RS-310-B).
- RJ45 connector and dual recessed encoders for ID selection on amplifier
with optional network board;
Construction: 1 mm (0,04 in) steel chassis, 3 mm (0,12 in) steel front panel,
3mm (0,12 in) steel screw holes protection.
- four 3 poles (5,08 mm) MSTB 2,5/3-ST-5,08 Phoenix© type connectors for
channel 1/2/3/4 inputs for positive, negative and signal ground;
Cabinet shall be natural steel color with black painted cover and blue and
black front panel.
- four 3 poles (5,08 mm) MSTB 2,5/3-ST-5,08 Phoenix© type connectors for
channel 1/2/3/4 auxiliary inputs for positive, negative and signal ground;
Net Weight: 29 Kg (63.9 lbs).
- four 2 poles (5,08 mm) MSTB 2,5/2-ST-5,08 Phoenix© type connectors for
channel 1/2/3/4 auxiliary 24V voltage command inputs for positive and
ground;
External dimensions: 483mm (19 in) wide, 480 mm (18,9 in) deep, 88 mm
(3,46 in) high.
Shipping weight: 32 Kg (70,54 lbs).
The amplifier shall be approved for use as specified by CE.
The amplifier shall be the Powersoft QTU1400.
Powersoft S.r.l.
Via Enrico Conti, 5 Scandicci (FI) – Italy
TEL: +39 055 7350230
FAX: +39 055 7356235
sales-audio@powersoft.it
QTU1400_A&E_SPECS_0608_EN
www.powersoft-audio.com
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