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#8336 - 01/24/03 03:04 PM Impedence 4ohms vs 8 ohms
massawi Offline
regular

Registered: 01/06/03
Posts: 5
Hi! I bought 2 speakers that have 4 Ohms Impedence (written on the back of the speaker) but my stereo receiver is a 15 years old JVC 8 Ohms to 16 Ohms. My question is: Can I use these speaker with my receiver without doing any damage?
Thank you for your answers!

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#8337 - 01/24/03 03:29 PM Re: Impedence 4ohms vs 8 ohms
chesseroo Offline
connoisseur

Registered: 05/13/02
Posts: 4829
Loc: western canada
Just offhand without any further info i'm going to say....no.
_________________________
"Those who preach the myths of audio are ignorant of truth."

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#8338 - 01/24/03 03:52 PM Re: Impedence 4ohms vs 8 ohms
Semi_On Offline
aficionado

Registered: 09/18/02
Posts: 737
Loc: Scottsdale, Arizona
I would agree...

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#8339 - 01/24/03 11:19 PM Re: Impedence 4ohms vs 8 ohms
massawi Offline
regular

Registered: 01/06/03
Posts: 5
What could happen?

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#8340 - 01/25/03 12:26 AM Re: Impedence 4ohms vs 8 ohms
fhw Offline
devotee

Registered: 11/22/01
Posts: 345
Loc: London, ON
Your receiver could very quickly overheat and fry, because it likely doesn't have the heatsinks or protection circuits necessary to deal with the excess current driving 4 ohm speakers.

This isn't to say it will happen, but I wouldn't take the chance.

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#8341 - 01/25/03 10:09 AM Re: Impedence 4ohms vs 8 ohms
Semi_On Offline
aficionado

Registered: 09/18/02
Posts: 737
Loc: Scottsdale, Arizona
In general I'd say it would turn itself off as all good electronics that output that much power should have fault control, but a 15 year old receiver that's rated for between 8 and 16... I'd be a bit nervous about that one. Might not be a big deal at low volumes, but I would be nervous without any knowledge of the receiver's circuitry.

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#8342 - 01/25/03 06:45 PM Re: Impedence 4ohms vs 8 ohms
JohnK Offline
shareholder in the making

Registered: 05/11/02
Posts: 10395
Mass, unless you're just going to sit there and watch your new speakers instead of listening to them, you've got to try something. I have no idea whatever what protective circuitry, if any, JVC receivers had 15 years ago, but frankly I would take a chance to try and find out. Start out at low level and see if the receiver gets hotter than with whatever speakers you've been using up to now. If not, increase the level and check again,etc. I assume that you don't have a JVC manual which might discuss the situation.
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#8343 - 01/26/03 01:53 PM Re: Impedence 4ohms vs 8 ohms
alan Offline
connoisseur

Registered: 01/29/02
Posts: 3188
Loc: Toronto/New York/Dwight
Hi mass,

To amplify (no pun intended, heh, heh) JohnK's comments, gradually increase the volume as you check the heat radiated by the receiver. It should get no more than warm to the touch. If it gets hot after driving your 4-ohm speakers for an hour or so, I'd say you're likely risking either blowing the output stage or thermal shut-down.

Protection circuits of various types have been around a long time. An early solid-state amp I built in the late '60s (a kit) had thermal sensors on its output transistors to shut down the receiver if it got too hot. Without seeing the impedance curve of the speakers, it's hard to know whether the curve just touches 4 ohms at one frequency or remains there over a good part of the spectrum. If it were the former case, the JVC might drive them with no difficulty.

Regards,
_________________________
Alan Lofft,
Axiom Resident Expert

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