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Technical Information

Welcome to Sound & Vision's technical advice section. Over the past decade we have built a vast knowledge base and have very technical members of staff. Through this we can pass our technical knowledge to you the customer.

We will be updating our site regularly as we receive more questions and providing simple and understandable answers. However if you think we have not covered something within our technical database please click the link at the bottom of the page. We will respond as quickly as possible and may even post your questions to our site.


Q. Why does my picture have comet trails/fuzziness and is it a fault?
A. There is no need to worry, this isn't a fault but a perfectly normal operating characteristic of 100hz processing. This often explains the appearance of certain 'artifacts' on poorly sourced images, e.g. VHS, satellite and some terrestrial broadcasts. Try turning the contrast down to approximately 50%, reduce colour and sharpness settings and reduce/switch off the digital noise reduction functions in the picture menu. It also helps if you are using a fully wired and shielded AV-leads with EMF suppressors. (In our experience, such phenomena also vary with digital broadcasts, such as Sky, in accordance with the 'bit rate' assigned to a particular transmission (e.g. compare Sky News' studio shots with those of Sky Sports - you can often detect a marked deterioration in the latter, purely because the broadcaster is committing less digital 'information' to that particular broadcast/channel.) Also, make sure that for maximum resolution you do select the correct wide-screen mode for the signal type you are viewing - remember that anything other than 4:3 or 'anamorphic' 16:9 settings (again, depending on signal type) are always going to deliver sub-standard resolution.
Q. Why does my television make a buzzing noise and is it safe?
A. Due to the size of the mains transformer and the scan coils within the television it's possible you may notice a low level buzz. This will not increase or decrease by adjusting the volume. Most of the time it can only be heard if you are standing very close to the television or at night when there is less ambient noise. Also take into consideration the surrounding environment i.e. floors and wall surfaces and if you have hard flooring any noise will be exaggerated, as there is less damping. Also be aware that voltage changes across a tube may result in certain frequency (pitch) changes; this may occur when a scene changes dramatically from a very dark to a brilliant scene.
Q. The picture quality on my VCR is not as good as my DVD why?
A. VCR processing is not as sharp and clear as DVD as it uses analogue technology and a lower transfer rate. DVD uses a high bit rate transfer with higher definition pictures and is geared up towards widescreen technology.
Q. I have just received my television and I have colour patches?
A. Most colour patches on screen are caused by outside objects or interference's. Please ensure that your television is left for 2-4 hours to acclimatise to room temperature. Check that there are no metallic objects close to the television i.e. radiators, pipes and speakers as this could be causing the impurities.
Q. The television has a slope to one side can I adjust this?
A. Generally all widescreen televisions will have a form of sloping some worse than others. It is considered by most manufacturers that approx 6 mm either side is within their tolerances. If you have a projection set the convergence can be adjusted within the user menu options.
Q. I have two faint bands either side of the screen what are they?
A. These two bands are known as doming and generally can only be seen on either very light or very dark scenes i.e. football where the majority of the picture is filled with green. The banding will not deteriorate and is recognised by all manufacturers.

DVD Players & Video Recorders

Q. When I play Region 1 DVD's my screen shows a black and white picture?
A. Check to make sure that your television is capable of receiving raw NTSC broadcasts, as this is the format Region 1 is produced in.
Q. I have checked my television and it is fully NTSC compatible?
A. You need to make sure your DVD player is outputting the correct signal to correspond which scart socket it is plugged into the television. Most televisions have scart 1 as RGB and scart 2 and 3 as SVHS. You need to also go into the menu of the DVD player and change the output to either RGB or SVHS.
Q. Why is my DVD player not playing some films?
A. Check the DVD disc is either region 1 or 2 as we only guarantee these regions. Are your discs R.C.E encrypted if so making sure that your player is capable of playback of these films.
Q. How long should I leave my VCR before using it to watch films?
A. We recommend that you should leave your machine for 2-4 hours inserting a tape in order to reach room temperature. Playback heads can have condensation during transit, which may make the magnetic tape stick to the head.
Q. Why am I getting interference when I connect my VCR to my Sky receiver?
A. Remove the aerial leads and scart lead from the Sky receiver and plug them directly into the television. If you still are receiving interference please check all connections and leads to make sure they are in good working order.

Amplifier & Speakers

Q. I'm not getting any sound from my DVD player using my digital optical lead?
A. Go into the amplifier settings and make sure that the input source is set to optical. Then go into your DVD player setup menu and check again it is set to optical and bitstream sound.
Q. Every time I switch my amplifier on it keeps on tripping is it faulty?
A. Tripping means that your speakers are not connected correctly or the standing is touching each other. The amplifier trips into protection mode to avoid long term damage to the unit, you should disconnect the wiring and re-connect.
Q. My amplifier is buzzing is there something I can do?
A. Your amplifier will buzz as it has a very large transformer inside the unit and as the unit is a amplifier it will amplify any buzz being created. You can reduce the some by grounding the amplifier correctly. It is best to check with individual manufacturers to correctly undertake the correct procedure.
Q. Can I adjust the speaker levels and which settings are the best?
A. Yes, you can adjust individual speaker levels within the settings of the amplifier. In a normal room it is best to have +1db on each speaker to give a level sound. This can fluctuate though depending on the size and shape of your room. It is always helpful to use a sound level meter to set you speakers up correctly to approx 75db, which is a THX specification.
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2nd October 2020