DENON 480r amp..at least 10 years old..but over time the right channel is quieter then the left and i have to use the balance control to correct the image .seemed an intermitent fault at first but now its like it all the time!
seems like a common problem with some denon amps bulit around this time. since it seems it was a common problem..is there a common fix for it? dry joint? replace a component?
i would love a new amp but cant afford it! so out with the screwdriver and soldering iron!
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Re: Lower volume on right side!
I have't seen this porblem, have you tried changing the source place's R with L and see if the sound have change side. If it did then it's your input signal.
I would first check the board for bad solder connection, but it sound like you have a cpu problem or the main ic's procesor. This can be checked with a scope with the ouput of the pre amp to see if the level or the same, with a mono input signal only. You may also have a section of the ouput stage not working, the pre amp , the stage before the main amp out will tell you all by looking at the signal level's.
II know it's not easy, but you will at one point need a scope, without it you will notice you're just going at it blinfowled. When purchasing a scope, put the money it it, a good scope will cost a min of $2k. I'm usind a teck scope and love it, I've also used a leader and find it just the same and sometine better for under $1k.
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The good news is that it's in one channel, which means you have the right channel parts to compare it with. Now the bad news whatever causing it and it's likely to be a semi-conductor (transistor or IC) has to be replaced. However finding it is easier than you might think. For a start it's going to be hot to touch. And you can get get it to stop being hot, while the amps on, so correcting the fault, for a while. You do this by spraying it with Servisol Super Freezer spray. You have to have the amp running for this. Find the left channel amp and wait while it goes bad. Then spray (one at a time) any part you suspect. If the sound returns to normal, you have found the faulty part! To prove it spray the same in the right channel. That shouldn't change.
You can get the freezer spray from your local electric parts shop (such as Maplin UK).
You don't mention which AR amp we're talking about.
I think you're trying to say you want to know where to extract the front channels from the Denon to feed the AR amp. Right?
That would be an output on the Denon to an input on the AR.
Basically, take an RCA cable pair from the Denon's Pre Out F & L and connect them to the (presumed) L & R inputs on the unnamed amp.
Set the AR amp at a reasonably high volume (if it has a volume knob) and leave it alone. Run through the speaker level adjustments on the Denon to match the Front to everything else and it will control the volume going forward.
HI , just found your post . I also have just picked up a denon DAP-2500 pre and 2 POA 4400 amps with klipsch belles, having same probs with power balance i followed some helpfull advise and deoxidized all rca jacks speaker terminals ect. also i opened the pre amp and cleand it even though it was fairly clean, i used cleaner on all switches and volume controll's . WOW I could hear it nice and clean . Next i will clean the amps. hope this works for you as this is great equpment well worth saving.
Check a few things first to narrow this down a bit. Disable the surround processing. If this clears up that channel, then the problem is in the processing area. If the static remains, vary the volume. Does the static change volume too? If so, then the problem is in the beginning stages of the pre-amp section and is likely a transistor or two breaking down. The parts for this would be in the $5 range. This would probably be considered a "major' repair becaue of the time required to hunt down the defective part.
Problems of this nature are often caused by electrolytic coupling capacitors. If you have access to an audio signal generator. Inject signal at volume control and compare left and right output levels. This will isolate fault to pre amp stage or power output stage. freezer can be very usefull in isolating this type of fault.
My Pioneer VSX-36TX (circa 2002) does the same thing. Modern AVR's count up from minus something to 0db and go just a few db higher into 'plus' territory. It seems arbitrary but that's how it is.
Ask yourself this: who ever really turned the volume knob up to maximum on any amp on purpose, and had speakers survive it? In other words, why have all that capacity on a potentiometer if you never use it?
Little known fact: With that in mind, Bose Corp actually designed a product that intentionally used the full physical travel of a volume control - the Bose Acoustic Wave Music System.
Hey ajn1n1 we need to fine where the tinnyness is coming from Lets do a test shall we,
hook up your voice matched polks to your front left and right speaker outputs on your amp to see how they sound as mains. if you hear tinny then its the speakers. sometimes speaker need to be broken in a bit.
hook up your main front left and right speakers to your rear outputs. if you hear the tinnyness then its the output of that channel on the amp or a setting. Newer amps let you change speaker sizes in the menu so that it can change over the crossover for that channel.