P1 & P2
Power Amplifiers
3.1 Description
The ‘P’ Series stereo power amps are a range of
high quality power amplifiers designed to partner
ATC passive monitors and other loudspeaker
systems. The range consists of P1, P1 Pro, P2 and
P2 Pro. The ‘Pro’ versions differ by featuring 19”
rack mount chassis, front panel mounted standby
button and remote standby trigger via a rear panel
mounted connector. The amplifiers incorporate
the same gain reduction and loudspeaker protection
circuits as used in the ATC active monitors. This
ensures that even working at very high levels the
amplifier is held back from clipping so improving
the subjective performance and protecting the
loudspeakers from damage.
All the amplifiers in the series are of a "true" Dual
Mono design, in that the power supplies signal and
return paths are totally separated from each other.
This approach ensures that the Amplifier will
Diagram 1 - PI rear panel and connection sockets
Diagram 2 - PI Pro rear panel and connection sockets
achieve the maximum signal separation and minimum crosstalk. Further,
Intermodulation between channels via the power supplies is reduced to an absolute
minimum at all frequencies, and, the power delivery from one channel cannot affect
the specified power available from the other channel.
The amplifier mains power is turned on by a push button on the rear panel. There is
a Green L.E.D. on the front panel to indicate that the mains supply is connected,
together with a Red L.E.D. to indicate that the Amplifier is in Standby. The Amplifier
can be brought out of Standby by the Standby button on the ATC SCA-R remote
control (supplied with P1 and P2). On the rear panel is a push button to defeat
remote control operation in which case, when the Amplifier is switched on the unit
will not be in Standby, The Red L.E.D. will be off, and the Remote control has no
effect.
The P1 Pro and P2 Pro amplifiers can be bought out of standby using the front panel
mounted button. No IR remote is supplied with the ‘Pro’ versions of the amplifiers
and they do not feature IR defeat on the rear panel. They do feature remote
triggering of standby via a rear panel mounted 5 – 12v ac/dc input.
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