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Modify existing 3 ohm souround speakers to 8 ohm for my new AVR

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 TomB
(@tomb)
Posts: 2
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Hi , i am looking for help. I have a set of Samsung souround speakers, tower style, which are rated at 3 ohm . I would like to keep the tower boxes  connect them to my soon to be purchased 5.1 AVR. Inside the tower I discovered two 3 inch 8 ohm drivers and one 3 inch 12 ohm tweeter, all connected in paralell. All up this equates to 3 ohm. My intended AVR shows it is compatible for 6 to 16 ohm speakers, ( why there is such a wide range i dont know, perhaps it is auto ajusting ) Is there a way to utilise my existing drivers for the new AVR. There is no filter inside the towers, just direct connection  to each driver. Your opinion on this will be greatly appreciated. Thanks , Tom

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Posted : 23/12/2023 3:38 am
 TomB
(@tomb)
Posts: 2
New Member
Topic starter
 

Update,  after checking a " All About Circuits" website , I discovered that if I connect the two 8 ohm drivers in series and connecxt the 12 ohm tweeter in paralell, I get a total impedance of 6.86 ohms.  Would this be a suitable arrangement for my Tower speaker system ?  It would certainly save me trying to fit new drivers ,   Opionions appreciated. thanks again, Tom

 
Posted : 23/12/2023 3:59 am
marcdraco
(@marcdraco)
Posts: 487
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If it were only that simple. Speak impedance is the DC impedance of the coil at rest but as an inductive load, it can vary with frequency.

Normally you'll need a crossover - you can get pre-made ones that are "good enough" on eBay - to separate the low-frequency from the high-frequency components.

Speakers (and most headphones) present a "complex" load to the driving amplifier which means you can't just last them together and get something that works. A complex load is something where the current and voltage are shifted away from each other so we have to use complex maths to solve the transfer function. There are loads of tutorials around if you've got the math know-how (I muddle through but not enough to be much help).

It'll work - but it won't work well.

This is always the down side of recovering old components from "dubious" sources. I know, I've come unstuck more times than I can count.

This post was modified 7 months ago by marcdraco


Take everything I say with a pinch of salt, I might be wrong!

 
Posted : 24/12/2023 9:14 pm