ページを印刷するBalanced Audio XLR sockets follow convention. Pin 1. = Ground/shield. Pin 2. = Hot (+ phase). Pin 3. = Cold (– phase).
Balanced audio inputs will naturally double the gain, or input sensitivity. The 4040 A pre-amp circuitry attenuates
the balanced input signals, so they match the Line input sensitivity.
If the user does not need balanced input's technical advantages, but requires another unbalanced Line input, this
can be easily achieved if required.
Two options to use the XLR as an unbalanced input are as follows:
1.
XLR-male to RCA female adapter plug or custom RCA to XLR male plug.
2.
Creek Audio can supply these types of cables and plugs, if required.
BALANCED AUDIO
Balanced audio is a professional method of interconnecting audio equipment. Balanced audio connections do
not use ground in the signal path. Ground is used only to shield the signal path from electromagnetic interference.
Longer cables may be used, if required, and are less susceptible to electromagnetic interference. A balanced
interface ensures that induced noises appear as common-mode voltages at the receiver end which are then rejected
or cancelled out.
LINE 1 and LINE 2
Both stereo RCA inputs offer unbalanced audio inputs for signals up to 2 volts in level, so they are suitable for CD
Players, DACs, Radio Tuners, and Streaming devices with analogue audio outputs. The volume level is controlled by
the audio pre-amp circuitry.
DIRECT
DIRECT is an alternative option for LINE 1. When PA Direct is selected in the MENU, any signal input on Line 1 sockets
will bypass the pre-amp and volume control and connect directly to the power amplifier. Therefore, it is essential to
control the volume level externally, via a pre-amplifier, or digital device (DAC) with volume adjustment.
PHONO
Phono input is an alternative option for LINE 2. When a Sequel mk4 Phono pre-amp is fitted to the 4040 A it will be
detected automatically and the display will change from Line 2 to Phono.
To listen to vinyl discs requires a Phono pre-amp to boost the signal by 40 or 50dBs (x100 or x316) and change the
frequency response to match the RIAA standard. This can be a stand-alone device like the Creek Audio OBH-8mk2,
or a dedicated plug-in preamp for the 4040 A called Sequel mk4. The Sequel mk4 Phono Pre-amp is a modular PCB
that plugs into the pre-amp PCB and reconfigures Line 2 from a line input to MM or high-output MC Phono. The 4040
A will automatically display PHONO when a Sequel mk4 is installed. Dealer installation is recommended.
GROUND TERMINAL
The screw terminal ground post above Balanced input socket is for grounding a turntable's tonearm. Most tonearms
have a separate ground wire to connect them to the amplifier's chassis ground. Some turntable brands combine the
tone arm ground with the signal ground, which makes the ground post redundant.
ANALOGUE INPUTS
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