Question about Sony STR-DE1075 Receiver
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Posted on Jan 02, 2017
SOURCE: Speaker Channels? STR-DE505
Maybe can clarify the reasons you have different output configurations.
I worked for Dolby in London for ten years and cinema processing was an area close to me.
To cut a long story short;
The number of factors and different combinations possible for a fully equipped cinema offering Dolby and / or other protocols to the guest is large to say the least even within the Dolby formats.
For Sony to try to offer a range of home units (recievers or tuner/amps/decoders in this case) was to say the least ambitious .but hey!..........who else can give the public what they think they need.,,,good old Sony
I have looked at this unit and it seems the "amplifier section" is used for various configourations
and power output ratings vary depending on the configuration you choose.
Stereo 2 ch L+R is 2 x 75w
Surround requires more channels (centre and mono rear) and of course new signal routing to and from these blocks which of course will draw from the modest power supply.
So 4 channel surround will deliver 4 x 50w.
etc. etc.............what you hear are the relays which are reconfiguring and re - routing the signals.
Basically you cant have all the sections working all the time due to cost /design restraints
So speakers A OR B can be used but not BOTH when in surround mode....where the centre and surround are needed. .you cant have A and B at any time....push both buttons an NEITHER will work ....release one button and there you go.............it saves "letting the smoke out of the box".........which you should never do...........cos they never work without it. :)
Sorry for boring you ...............but I think you will find the unit is working just fine.............you could read the manual but that's not too informative.
Right...off to get a life now
Posted on Nov 22, 2008
First off, you want to correctly isolate what or which channels are/is bad. Use one good known speaker. Connect that speaker, one channel at a time, and test that channel with a fixed volume level (don't adjust the volume when you check each channel). Isolate the low level channels and make note of it. Note: each channel has their own amplifier. Once you've isolated the bad channels, take it to a repair shop and tell them the bad channels. They will then locate the circuit and narrow down the search to fine the problem - it's usually a bad solder connection. If it blows fuses - more likely a shorted transistor. In your case it's a bad solder connection.
Posted on Dec 22, 2010
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