Ottocanali 12K4 Amplifier Architect`s and

Ottocanali 12K4 Amplifier Architect`s and
Powersoft S.p.A.
Via Enrico Conti, 5 | 50018 Scandicci, FI, Italy
VAT/P.I. 04644200489
Ottocanali 12K4 Amplifier
Architect’s and Engineer’s Specifications
The amplifier shall be an eight-channel model and will implement an universal switch mode
power supply with power factor correction, smart rail management and bridgeable switch mode
fixed frequency class D output circuit topology. The amplifier shall operate from 100 V - 240 V,
-10% / +10% 50/60 Hz, universal AC input power with minimum voltage for power up at 90 V
and power factor cos(φ) greater than 0,9 from 500W to full output power and shall draw 2115W
(9,7 A @ 230V) or 2075 W (18,5 A @ 115V) when driven with pink noise signal at 1/8 of rated
power into 4-ohm loads.
The amplifier shall be provided with an IEC C20 main detachable connector and power cord set
with IEC C20 connector on amplifier side and Schuko plug for EU and 3 Pin American plug on
the other. The amplifier shall have internal heat sinks cooled by a continuously variable speed fan
with a Microprocessor Temperature Control. Air flow shall be from front to rear. The amplifier shall
be able to drive low impedance loads (2/4/8 Ohm) and 70V/100V distributed lines selectable per
channel by using dipswitch settings at the rear panel of the amplifier. Furthermore, it shall be
able to provide more than 60 different possible output configurations (lo-Z, hi-Z, bridge mode,
parallel mode, and combinations of these). The amplifier shall deliver a maximum output power
per channel of; 850W at 8 Ω; 1500 W at 4 Ω; 1000 W at 2 Ω; 3000 Watt at 8Ω bridged; 2200 Watt
at 4 Ω bridged; 1500 Watt at 100 Volt and 1500 Watt at 70 Volt.
The amplifier shall have Energy save capabilities that can be activated for each channel pair. In
energy save mode, the Amplifier shall enter a low power consumption idle state when no signal
activity is detected for more than 4 seconds. Normal operation shall be resumed in a matter of
milliseconds when an incoming signal is detected on the channel pair .In Idle mode, the amplifier
shall not absorb more than 35 W @ 230V or 30 W @ 115V (0,8A @ 230V or 0,6A @ 115V). The
amplifier shall not dissipate more than 1937 BTU/h @ 230 V and 2141 BTU/h @ 115 V at 1/8 of
the rated power at 4 Ohm.
The internal memory of the amplifier will contain of predefined pre-sets with cross-over settings
and will allow for more than 200 users pre-sets and snapshots to be stored.
The amplifier shall be equipped with remote On/off contacts and gain selection switches which
will allow the amplifier to operate with 26,29,32 and 35 dB gain applied to the input signal. The
amplifier shall implement HPF filter to either 35 Hz or 70 Hz configurable per channel.
The amplifier shall have a synchronized off-on muting, acting for four seconds after turn-on and
within 500mS after turn-off or loss of AC power. Each channel shall have DC protection in order
to protect against infrasonic signals and very low frequencies at the output stage that could
damage loudspeakers. Each channel shall have VHF protection in order to protect loudspeakers
from strong, very high frequency signals. Each channel shall have circuitry to protect against
short circuits or other stressful output circuits events. Each channel shall an independent clip
limiter in order to prevent severely clipped waveforms from reaching the loudspeakers, whilst
maintaining full peak power.
Via Enrico Conti, 5
50018 Scandicci, FI, Italy
T: +39 055 735 0230
F: +39 055 735 6235
Via dei Cadolingi, 13
50018 Scandicci, FI, Italy
T. +39 055 735 6117
Powersoft S.p.A.
Via Enrico Conti, 5 | 50018 Scandicci, FI, Italy
VAT/P.I. 04644200489
The amplifier system shall implement triggering signals to broadcast alarms by providing a pair
of paralleled general purpose output connections per channel: one Normally Open (NO) and one
Normally Closed (NC). The GPO contacts will be used to report potentially dangerous faults or
generally unsafe operation conditions by toggling alarm switches relative in case of no AC mains,
thermal stress , short circuit in output wiring, amplifier is in Standby, DC presence at the output,
Input pilot tone out of range, output pilot tone out of range and output load out of range.
The amplifier shall offer redundancy on the inputs by offering 8 auxiliary inputs next to the 8
analog line inputs. The auxiliary input will be able to be triggered remotely by close contact
connection provided on the rear panel of the amplifier. A fixed +/- 12 volt DC connection on the
rear channel will allow remote switching of the auxiliary inputs. The amplifier will be equipped
with a redundant power supply. Failure of one of the main power supplies will result in a 6 dB
reduction of specifications.
Each channel shall have long term limiters in order to protect loudspeakers against non-musical
signals such as sine waves, feedback signals etc.
The amplifier front panel shall provide ON LED and STANDBY LED, Armonía ID push button,
Soft Reset push button, Hard Reset push button, Self-Check function, Status LED strip, LED
signal metering per channel, level potentiometer per channel, power push button and a USB port
reserved for servicing.
The amplifier rear panel shall provide AC mains connector, Phoenix output connectors, Phoenix
line input connector, Phoenix Auxiliary priority connector, Phoenix GPO connector, System
configuration dip switches and output configuration dip switches.
Via Enrico Conti, 5
50018 Scandicci, FI, Italy
T: +39 055 735 0230
F: +39 055 735 6235
Via dei Cadolingi, 13
50018 Scandicci, FI, Italy
T. +39 055 735 6117
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