Question about Technics SA-DA10 Receiver

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Speakeres killer don``t now whu,but my SA-DA 10 have allready destroed 4 par speakers,KEF Q-50,DALI EAGLE,TECHNICS,AND ONE MORE.Everytime,the hightoner dies...weard,is it?now i got wery exspensive whafendale speakers,but i``m afreid to even conect them.PLEASE,HELP....I WONT TO LISTEN MY MUSIC AGEIN.THANKS SANY K?BENHAVEN

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Are you paying attention to the power rating of your speakers? Your receiver has a high power capability and would be quite capable of destroying speakers with inadequate power handling capabilities.

By the way, the Tivoli was a great place to be in 1963 for a young guy!
Hope it still is . . .

Posted on Apr 23, 2008

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Speakers killer

I don't have the specs available for your SA-DA10 so the distribution of power over frequency is unknown to me but the receiver is capable of ~500 watts with most of it likely concentrated in the lower frequencies which do require more power to produce.

However, if your speakers are all of the typical wire-wound voice coil construction, the tweeters and midrange speakers use a much finer gauge of wire that has less power handling capability than the heavier stuff used in woofers.
That is lighter wire is necessary to keep the moving mass of the speakers low otherwise they would not be able to move quickly enough to reproduce the higher frequencies.

Additionally, it is possible (I have seen it) that your amplifier section is producing output frequencies caused by internal oscillations (a defect) that were not part of the sound they were trying to reproduce. These unwanted sounds can be well above the range of hearing so would only serve to destroy the speakers.

This problem could only be caught by an oscilloscope, not seen by the average analog or digital meter.

There is also a chance that you have DC offset voltage on the guilty channel; something that could be seen with an inexpensive multimeter; if you don't own one, there are incredibly cheap but adequate Chinese meters (digital type) that can be had for a few dollars in the US (as little as $3 US) and are probably available in Denmark too.
I suggest you should have one at home for many simple tests as they require very little technical knowledge to use.

I would have all speakers connected but NO SOUND being produced.
Measure ACROSS each of the speakers' output terminals (at the receiver or the speakers) and look for any larger DC differences between the several channels.
There should be very low levels of DC voltage (less than a volt) at those points regardless of how long the receiver has been on.

There seem to be many reports of failed output modules (discussed elsewhere at Fixya) and this could easily cause especially the high frequency speakers to fail from static (no sound) current flowing through them.

The Tivoli has apparently grown since I last saw it (~ 1963-4). When I knew it, it had several dance halls, many places to eat and a great number of very friendly English-speaking young women, the latter was much appreciated by myself and other Americans of my age.
I am afraid my traveling days are gone so enjoy it for me when you next go there!


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If all the speakers are connected proper and it still says "Overload!!!!!"

Your output amplifier module is most likely failed.

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