Please read before power on the
Precision 3 (2020 Edition) :
1, Precision 3 (2020 Edition) had the RCA and ACSS inputs, there is a switch on
the center of rear.
The switch push into for select RCA input, and pull off for
select ACSS input.
Please note you must select the switch while the unit power OFF.
You can not short the outputs of Precision 3 (2020 Edition), even though it had
built in protect but still will lost the warranty.
2, Precision 3 (2020
Edition) is a pure power amp, you must have a preamp or
headphone amp feed to it.
You CAN'T feed to it from a fixed level output DAC , in case it
may damage your speakers or headphones.
If connect to Audio-gd NFB11, NFB28 , NFB29 or NFB27 ect models,
you must ensure the DAC had setting on variable output mode.
3, Precision 3 (2020 Edition) is a stereo power amp, you can use it drive a
pair speakers , or a headphone through adapter cable.
4, Two units Precision 3 (2020
Edition) can working as bridge mode for boost
the output power up to 200W
per channel, you may need buy the bridge cable to connect two
You must have a balance output preamp for connect two units
Precision 3 (2020 Edition).
Please note, in bridge mode, the speaker connect as below, the
red RCA or ACSS cable connect to right input (your face to
Precision 3 (2020 Edition) face, right side input is right input), and the
black RCA or ACSS cable connect to left input. The right output
connect to speaker as + and left output connect to speaker as -.
The output - of Precision 3 (2020 Edition) don't want connect .
5, Two units Precision 3
(2020 Edition) can working as Bi-amp mode for boost
the power up to 140W per channel. You may need buy the bi-amp
cable for connect the Precision 3 (2020 Edition). And you must have two pair
speakers for connect the speakers working with separate amps.
You can connect the Precision 3 (2020 Edition) with a balance or unbalance
Please note , in Bi-amp mode, your speakers must have the real
In our experiences, some speakers even have the 2 groups inputs
but they just simply connect as normal 1 groups input.
We are advice you test your speakers if had the real bi-wires
input before purchase the Precision 3 (2020 Edition) .
Usually the speakers have the cooper jumpers connect between two
groups inputs, take off the jumpers let the one groups without
any connect, if the speakers lost some sound, your speakers are
the real bi-wires connect.
You can not connect the bi-amps to a fake bi-wire speakers,
that will damage the amps and lost the warranty.
In case , you can connect one Precision 3 (2020 Edition) working for one
speaker, the Right output connect to bass and left output
connect to tweeter .
In our experience, bi-amp can sound better than some electric
frequency divider .
Please click to choice speaker cable if you need :