Vincent Audio SA-96 Tips Search for Errors, Burn in/ Warm up, Net frequency noise

TIPS

SEARCH FOR ERRORS

Burn in/ Warm up

Your audio components need a certain time period until they reach maximum performance. The duration of this “warm up” time is very diffe- rent for the various elements of your audio system. Higher and homogeneous sound quality is achie- ved while keeping the device switched on.

Your audio specialist dealer has enough experi- ence to give you more information.

Net frequency noise

Some audio source devices may in combination with the amplifier cause a humming noise at power line frequency audible from your speakers. Usually, its volume varies with the volume setting of the amplifier. This is no sign of a defect or fault of your audio products but has to be eliminated. Generally, every wall-powered device connected to the ground wire of the power plug can cause this problem when connected to the amplifier.

Experience shows that this problem is mainly cau- sed by antenna-connected components (as TV-sets or Tuners), personal computers, electrostatic loud- speakers, subwoofers, record players or headpho- ne amplifiers that are connected to the audio inputs of the amplifier. Another possible reason for humming noise is electromagnetic interference of other components’ power supplies with pick-up- systems of record players (change the place of the record player for a test).

In most electric devices the ground potentials of all signals are connected to each other at one central point, where they have one common connection. If the device uses the protective conductor of the wall outlet, the corresponding wire of the line cord is connected intractably to the metal housing of the device. This is the mostly the point where the central grounding point is attached to. By doing this the housing is able to shield all signals from external radiated noise. Some main amplifiers are equipped with a “Ground Lift”-switch. If it is acti- vated, ground potential of the chassis and the pro- tective ground wire are being separated from the central signal ground point. The protective ground wire keeps its function. Sometimes this helps pre- vent noise caused by errors in grounding.

If the problem occurs and cannot be solved by yourself your audio specialist dealer will help you.

Quality of MP3 audio files

You can produce MP3 files on personal computers yourself. The programs that handle the conversi- on/encoding offer various settings here. The scan- ning frequency and resolution selected should be similar to the relevant audio CD properties of

44.1kHz and 16 bit. A data rate of 128 kbit/s (kbps) and higher should be used so as to at least come close to CD sound quality. The choice of the encoding algorithm used by the program also affects the sound quality.

Symptom	Possible Cause	Countermeasure
Unit does not	Mains cable is not connected to a suitable	Connect to a functioning socket using a
work after pressing	mains wall outlet.	suitable mains voltage.
the power button	Mains cable has not been firmly inserted into	Check the power cable. If necessary, ex-
	wall power socket and the device’s socket.	change it with a suitable mains cable and
	Otherwise it may be defective.	push its plug firmly into wall socket and the
		device's power connector.
	Unit fuse or unit is defective.	Contact your dealer.
No sound on both	The currently selected audio source (3)	Switch on the source unit and begin playback.
channels although	is giving no signal.
the unit is ready	One of the audio settings of a connected	Correct the settings in the player’s setup.
for use (LED in
	DVD player (analogue/digital) has not been
the VOLUME knob
	correctly selected.
is illuminated)	The output of the source device is not	Correct the connection.
	connected or is wrongly connected e.g. not
	connected to the selected input channel
	terminal of the preamplifier.
	Wrong input channel has been selected at	Set the amplifier (3) to the input that your
	the amplifier.	desired source is connected to.
	Volume setting is set too low.	Carefully increase the volume (2).
	The amplifier is muted (MUTE-Function).	Deactivate the MUTE function (17) after,
		as a precaution, reducing the volume level.
	Main amplifier(s) has/have not been connec-	Check the connection and ready status of
	ted correctly to the preamplifier, is/are	the main amplifier(s) and whether it is/they
	switched off or is/are faulty.	are working.
	The speaker cable is not properly connected	Check and tighten the speaker cables at the
	to the main amplifier's terminals or is defective.	main amplifier and the speakers.
No audio playback	The source equipment is giving signal on only	Check the audio source. You can try to use it
on one channel	one channel.	at a different amplifier for a test.
	One of the signal cables between audio	Check the cable connections, tighten them
	source and preamplifier inputs has not yet	if necessary.
	been plugged in or is defective.
	One of the loudspeaker cables or one of	Check all the connections of the main
	the signal cables between pre and main ampli-	amplifiers and whether the loudspeakers are
	fier is not correctly connected or it is faulty.	working.

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