I purchased a Sony STR-DE885 Receiver last week to go along with an Onkyo SKS-HT500 Speaker System I purchased the week prior. The problem I am facing is sound quality, I can faintly hear sound when I set the volume number to 40. I have checked my speaker wires, my receiver settings, etc. My internal tv speakers are lounder then my surround sound system. I was wondering if others have experienced the same problems, can give me advice or let me know if I need to return the receiver to the manufacturer.
Well, the speakers and receiver don't have to be the same manufacturer by any means. Is the receiver under warranty? I wonder if there is a problem with it. Even with the Sony you should be able to get it pretty loud if you want. The logarithmic volume control means that the first 1/2 of the volume control may not produce alot of sound, but then it should start increasing in volume at a fairly fast rate. Can you get it to play loud and still sound good?
Here is a quote from a website that describes the logarithmic volume control vs. linear:
Also, here is a definition for pot taper (log vs linear) from "Electronic Projects for Musicians" by Craig Anderton:
"One other characteristic of pot taper, might cause confusion. The taper of a pot is another word for the rate at which the resistance changes. The most common is linear. Turning it halfway gives half the resistance, a quarter gives a quarter, two-thirds gives two-thirds,and so on.
A log taper pot, however increases resistance logarithmically. This means that turning up the pot halfway covers only about 10% of the total resistance; two-thirds covers about 40%. As you get past this point, each degree of rotation covers a progressively greater amount of resistance."
See 1/2 way up on linear is 1/2 power/resistance (attenuated power from the max), on logarithmic, it is about 10% - that is a huge difference and until you are used to this, it may seem like you have to crank the h*ll out of it to get sound. To get the same 1/2 power/resistance, it would be about 75% - notice 1/2 way up is 10%, but 75 is about 50% - though the difference is 50% on the volume control.
Dennis
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Solution #2
posted on Aug 08, 2005
Charlie - usenet poster
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"Dennis' Newsgroups" <denni @attbi.com> wrote in message < >...
If I purchased an Onkyo Receiver to go along with my Onkyo Speaker Package & Sony Speakers to go with my Sony Receiver...would that solve problems? I cant even listen to the radio without cranking up the volume to drastic measures.
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Solution #3
posted on Aug 08, 2005
Janice - usenet poster
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A couple of things:
I think the Sony receiver, like most AV receivers lately, has logarithmic volume control (not linear) so you don't go by the numbers.
2nd the Onkyo speaker setup is not very efficient speakers - ranging from 82db for the surrounds to 85 and 86 for the center channel. This means that with 1 watt that is the decibel rating. To increase 3 db, you have to double the wattage. i.e. 82 at 1 watt, 85 at 2 watts, 88 at 4 watts, 91 at 8 watts, 94 at 16 watts, 97 at 32 watts, 100 at 64 watts, etc. Some speakers are rated at up to 103 db (low 90's is the more common number). This means your speaker setup is a bit harder to drive for the amp to get the volume.
Sony DE receivers are not 100 watts per channel by any means. With 3 or more speakers running, I would bet that the power you get is probably alot closer to 30-40 watts max before distortion. Your receiver would be lucky to produce 100 clean watts from just 1 channel. Alot of manufacturers over stating their amp ratings has been going on for years (this is because the average consumer is number/spec oriented). Some manufacturers are much more accurate in their ratings like Yamaha, Denon, Marantz, Onkyo, Harman-Kardon, etc. This is why you will find that most of these, even if it is rated at 55-70 watts per channel, are more powerful than the Sony that is "100 watts".
Alot of people listen in the range of 10-15 watts, unless their speakers are not very efficient.
Dennis
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