Audio Precision APx1701 Series, Руководство по установке, Страница: 33 / 44

Chapter : User’s Guide
APx1701 Transducer Test Interface: User’s Guide 15
resistance cable, such as the ground strap provided with the
interface.
DUT connections (amplifier outputs)
Each channel of the two-channel audio power amplifier in
the APx1701 has an output source resistance of approxi-
mately 0.13 Ω, including the 0.10 Ω current sense resistor.
When one channel is in use, the amplifier is rated at 100 W
into 8 Ω, or 60 W into 4 Ω. The amplifier can drive lower
impedances, but is limited to an output current of about 6 A.
When two channels are in use, the amplifier is rated at
30.0 V rms into loads above 15 Ω.
Loudspeaker connections
The APx1701 amplifier outputs appear on the 4 pins of the
Neutrik NLT4M SpeakON connector. The diagram here
shows the pin arrangement for the mating NL4F or NLT4F
cable connector, shown from the rear (cable-connection)
point of view. Use large gauge, high-quality speaker cable
of short length for best results.
The amplifier output signals appear on a four-connector
SpeakON connector, wired conventionally according to the
following diagram.
Note that rotating and disconnecting a SpeakON
connector while under load can result in arcing,
which will damage the surface of the contacts
and increase parasitic resistance. Do not discon-
nect while under load.
Headphone connections
When connecting to headphones that are fitted with a 1/4-
inch or 3.5 mm tip-ring-sleeve (TRS) plug, a SpeakON to
TRS jack adapter must be used.
Use only the Ch 1– connection as a return for both chan-
nels, as shown. This avoids the unintended paralleling of
the sense resistors.