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My Brother ruined my dads speakers, need help finding new ones

post #1 of 9
Thread Starter 
Hi,

Summer 2012 my Brother turned my dad's sound system to 100% to and went outside on the terrass to relax while listening to it.

I heard it and came to shut it down and noticed it was smoking and rattling, so I unplugged it, later it has definately not sounded good at all.




Its an old System ( Sony TA-F570ES ) from early 1990's, capable of 80w per channel at 8Ohms.

The old speakers are 21cm and I meassured 4.2Ohms on them, not sure of their wattage, but it says 32210 2201972 on them , The treble speakers I meassured 7.4Ohm, it says 99-20107 813TNY on them, I think they are connected in series looking at the speaker cable connection.

I also meassured the ohm on the connectors with the speakers connected, I meassured 4.5Ohm.


He gave me a budget of $245 , the system is sentimental to him so He would rather like to fix it than buying a new one

What I am wondering, is what kind of speakers will I be able to fit to this, so that they will play decently on my fathers Analog only Amplifier?
should I also replace the Treble speakers?




post #2 of 9
First things first - the whole box is called a speaker, with two drivers in it. There is a tweeter - which handles the treble and a mid/bass driver more commonly known as a woofer.

By the looks of it, you'll need to replace the woofers in each speaker. I would imagine the tweeters are ok seeing as most of the power sent to the speaker is diverted to the woofer by the crossover. You should be able to find some generic 8 inch woofers in a local electronics store or something similar which will do the job, try those first and then test them to see if the tweeters need replacing too. smile.gif
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post #3 of 9
Thread Starter 
But how does Frequency range of a woofer relate to freguency response of the amplifier?

Will a 200watt 4ohm woofer be the same as a 100w 4ohm woofer since the amplifier is only 80w?
post #4 of 9
Quote:
Originally Posted by Norlig View Post

But how does Frequency range of a woofer relate to freguency response of the amplifier?

Will a 200watt 4ohm woofer be the same as a 100w 4ohm woofer since the amplifier is only 80w?

Frequency response, power rating and impedance are three totally separate things.

Frequency response can be ignored for this problem. Any frequency response of a driver will be compatible with any frequency response of an amplifier, so don't worry about that.

In terms of impedance (ohms), it is important to match. Make sure you buy woofers with the same impedance as the old drivers, it should be printed on the magnets somewhere. If not, play it safe and buy 8 Ohm woofers. The impedance of the woofer and the tweeter would have been balanced to create an even response from the same power level through the crossover.

Power ratings can be misleading sometimes, as they can be measured and quoted on slightly different scales and ranges. If your amplifier has 80W of power per channel, find some woofers that handle between 80 and 200 Watts and you should be fine to drop them straight in where the old ones were.
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post #5 of 9
When you've figured out the specs you need, I'm a fan of Parts Express for drivers.
http://www.parts-express.com

... and I read your location afterward; sorry.
post #6 of 9
You could have them rebuilt- that way they'll most closely match the original performance.

Honestly, had you taken a look at them before they were blown? Looks to me like the speaker foam had given out and that's what caused the failure- I don't think your brother killed them, but rather found the problem. Foam like that gives out after about 20-25 years. Of course, if you had caught it earlier, you could have refoamed them.

Otherwise, you'll need to find similar woofers of equal or greater wattage, and as closely matched sensitivity as possible.
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post #7 of 9
are you sure what is damaged and what isn't?

the woofers might be salvageable if you push down on them (gently and straight down) do they sound like they are rubbing? if the Voice coils are not fried the might just need a simple refoam job , if have done this on maybe 5 speakers now.. it isn't hard at all guides abound online (join audiokarma they can probably help you trouble shoot the advents)

it is certainly possible the tweeters are fried also... but it may be with a bit of tlc and a few parts (refoam kit ) and /or a few other parts (can't say for sure but what look like identical advent tweeters for sale of on the auction site for $30~

the other thing to do would be to recap the crossover



then give the cabinets a clean and some howards restore a finish and you'd be about rocking

tell your idiot brother not to turn anything up to 100% again however... =p
post #8 of 9
Quote:
Originally Posted by atarione View Post

are you sure what is damaged and what isn't?

the woofers might be salvageable if you push down on them (gently and straight down) do they sound like they are rubbing? if the Voice coils are not fried the might just need a simple refoam job , if have done this on maybe 5 speakers now.. it isn't hard at all guides abound online (join audiokarma they can probably help you trouble shoot the advents)

it is certainly possible the tweeters are fried also... but it may be with a bit of tlc and a few parts (refoam kit ) and /or a few other parts (can't say for sure but what look like identical advent tweeters for sale of on the auction site for $30~

the other thing to do would be to recap the crossover



then give the cabinets a clean and some howards restore a finish and you'd be about rocking

tell your idiot brother not to turn anything up to 100% again however... =p



Yeah re-foaming is so easy that I was able to do it myself after reading a brief pamphlet, my garbage picked infinity speakers sound great now thumb.gif

But as atarione said, gotta check the voice coils... If you said the speakers were smoking then it is very likely that the coils super-heated, which may or may not have resulted in distortion of the baffles or melting..

Crossover cap needs to be inspected as well
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post #9 of 9
Overexcursion resulting from playing loud with bad foams can cause voicecoil damage, the voicecoil to come disconnected from the cone, and/or damage to the lower spider. Refoaming may work, but I wouldn't bet on it at this point.

You'll have to examine the whole thing carefully- don't just measure the coil with a meter and pronounce it OK.
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