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ADVANCED TECHNOLOGY SPECIFICATIONS
Advanced Technology Design Series IV from AB Tyoei 21%|"? 9-Ö51?!-ť with _
International is a modular system of high performance n ar 5'9-ť pmmss'ng
power amplifiers and electronic signal processing that Poweroutput´Čé LF: 500w at e (2
may be precisely tailored to the specific requirements of 1380-ś-Ł 3-ś49
. w at 2 r2
professronal loudspeaker components.
HF: 150w at 8 Q
The experience gained from building three generations of Gain: 325 dB. LFAHF
signal~processing power amplifiers brings new features
and new standards of performance to ATD IV. The low
frequency power amplifier oi the 712A is fully
complementary and operates from a six┬ź|evel logicgated
power supply that adapts to the input waveform to
provide only the DC rail voltages necessary for
undistorted amplification. The result is tremendous
output capability, cool operation and unconditional
stability over an unusually wide range of load conditions.
A delayed-ON, instant-OFF muting control circuit allows
internal supply voltages to stabilize before loudspeakers
are connected. Speaker connections are instantly
removed, should there be an interruption of AC power.
Included in the 712A are two apportioned power
amplifiers, selectable system high pass filters, precision
step attenuators, fourth-order Bessel active crossovers,
an adjustable all-pass delay network for LF-HF
time-phase correction at crossover, adjustable low
frequency Thiele-Small alignment equalization, balanced
and unbalanced inputs with looping provision and high
frequency power response compensation for
professional compression drivers.
For users desiring specific non-standard features and/or
signal processing, a wide range of options are available,
including high pass frequencies, crossover frequencies
and filter topology and HF power response equalization.
See 'Optional Equipment' brochure for details.
input sensitivity:2 1.5 Vrms (referred to rated 8:1 LF output)
input impedance: 15 kt), balanced or unbalanced
Noise level: 100 dB below rated outputs. unweighted
800 Hz, 4-pole (24 dB/octave)
Signal processing:3 8 stem high pass (40 or 80 Hz) 2nd-order
derived w/adjustable underdamping for
assisted Thiele-Small alignments
Adjustable low-pass delay for LP output
Adjustable equalization for HF
power response compensation
Controls: Power, system level
L : Delay, level, high pass/E0
HF: level, EQ
XLR-S (bal) with loop-thru and ground "it
switch, 1/4-inch (unbal)
120/240 VAC, 50/60 Hz, 400w (avg)
1500 w (max)
5-ś1/4' (13.3cm) H x 19' (48.3cm) W x
13-ś1/2' (34.3cm) D; 42 lbs. (19.1 kg.)
l. Continuous power output at less than DAV. THO. 20 Hz to 20 kHz. outputs normalized
lor full-range operation
2. With all level controls adjusted for zero attenuation. normalized response to a sweat
input signal Will be tier:
3. A_ wide range ol optional crossovers and signal processing IS avauable. Please relerto
'cptronat equipment for oalatls,