QUAD PA-ONE+, Owner'S Manual

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3
SETUP
Connect the music source to a suitable input on the unit and select the balanced or unbalanced line input as appropriate for
analogue signals. Plug your headphones into one of the front panel sockets according to the connection style of the headphones.
Set the volume to minimum, connect the unit to the mains supply and switch on. The amplifier takes 30 seconds or longer to
warm up before you can use it.
The PA-ONE+ is able to drive both high and low impedance headphones, selected via a switch on the rear panel. ‘High
impedance’ means 100ohms and above; ‘low impedance’ is below 100ohms. (Typically, high impedance headphones are
200ohms or 600ohms, while low impedance types are 32ohms.)
A specification for impedance will normally be included in the instructions that come with the headphones, or you can judge the
impedance type of your headphones by following the steps below.
Connect your headphones and switch to LOW impedance. Turn up the volume slowly while listening to a familiar music track.
If the volume seems low, even at maximum volume, your headphones are probably high impedance. Turn the volume down to
minimum level and switch to HIGH impedance. Turn the volume up slowly again and check that the volume is satisfactory. High
impedance headphones will clearly play louder when matched to the HIGH impedance setting. Low impedance headphones will
play slightly louder when the LOW impedance setting is selected.
Analogue interconnect cables should be low capacitance and well screened. Avoid excessively long cables for both analogue
and digital connections.
CAUTION
The volume should be set to minimum when you switch on the unit. When the unit is playing a music track, adjust the volume
knob slowly and keep the volume at a comfortable level. Listening to loud sounds for a long period can damage your hearing
permanently. If you feel uncomfortable while listening, or if there is a whistling in your ears after a listening session, you may be
listening too loud. Turn the volume down.
There are no user adjustable settings inside the unit. Please do not remove the top cover as this will expose high voltage parts
which present a danger to life.
The unit generates heat while working, so it should be placed in a well ventilated position, and enough space is required behind
it to ensure that leads are not unduly strained or damaged.
Very frequent switching on and off of any electronic equipment puts some stress on components, particularly in the power supply.
The unit should be switched off when not in use to save electricity and to maximize operating life of the valves.
Do not plug in rechargeable headphones or earphones as these may cause damage.
USING THE USB SOURCE
With the increased popularity of downloadable or streaming digital files, the PA-ONE+ USB D/A converter allows consumers to
enjoy listening to digital music sources from a computer (Windows or Mac) via the USB connection.
This product is USB 1.1 and 2.0 compliant and supports sampling frequencies ranging from 35kHz to 384KHz (supports DSD64
DSD128 DSD256) via the high quality Digital-to-Analogue converter (DAC). The DAC defaults to a 48kHz input sampling
frequency. With a digital source connected and playing, the PA-ONE+ USB DAC will detect the sampling frequency of the input
data automatically. The front panel indicators will then indicate the presence of a digital signal and the source selected.
Note: Windows does not support 192kHz sampling frequency. Owners of computers with Windows OS are advised to install
corresponding software provided in the accompanying CD-ROM. Simply follow the software installation instructions included.
PA-ONE+ Manual-181031.indd 3 2018/10/31 14:15:36