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Go Back   Blu-ray Forum > Audio > Receivers


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Old 11-23-2008, 11:33 PM   #1
Snpbond Snpbond is offline
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Default Speaker Impedance with Reciever

Hey everyone,

Once again I am looking at getting a reciever to enjoy my blu-ray movies a little more than my old 5.1 reciever (which supports DD and DTS but not the new codecs).

I dont have a bunch of money and am looking at the Sony STR-DG720, which should support LPCM that my PS3 sends out anyways (correct?).

My question is that I had purchased an older reciever a couple years back from sony, which came with speakers. The label on these speakers say that they have an Impedance of 6ohms, however I see on the back of the reciever I plan to buy that it supports 8-12ohms (from memory). Is it safe to run these speakers on this reciever? Or wait till I can buy new speakers at the same time?
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Old 11-23-2008, 11:37 PM   #2
jomari jomari is offline
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you can double check on the specs of the 720 in its manual, but it SHOULD have the capability to switch from 8-12ohms to 6ohms... will do more research to help out.

what kinda speakers are we talking about here?
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Old 11-23-2008, 11:39 PM   #3
Johnny Vinyl Johnny Vinyl is offline
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Quote:
Originally Posted by Snpbond View Post
Hey everyone,

Once again I am looking at getting a reciever to enjoy my blu-ray movies a little more than my old 5.1 reciever (which supports DD and DTS but not the new codecs).

I dont have a bunch of money and am looking at the Sony STR-DG720, which should support LPCM that my PS3 sends out anyways (correct?).

My question is that I had purchased an older reciever a couple years back from sony, which came with speakers. The label on these speakers say that they have an Impedance of 6ohms, however I see on the back of the reciever I plan to buy that it supports 8-12ohms (from memory). Is it safe to run these speakers on this reciever? Or wait till I can buy new speakers at the same time?
Correct me if I`m wrong, but I`ve never ever heard of a receiver or speakers capable of a 12-ohm load.
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Old 11-24-2008, 12:06 AM   #4
jomari jomari is offline
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Quote:
Originally Posted by John72953 View Post
Correct me if I`m wrong, but I`ve never ever heard of a receiver or speakers capable of a 12-ohm load.
its just a phrase mostly used to determine the amount of impendance the receiver can handle... i cant think of that many speakers that go up that high either, but then again, its labeled as such on some equipment anyways.

id be more concerned about him using 4ohm rated speakers on a 8ohm rated receiver.

now THATs a workout. and a firehazard if it doesnt shut down properly.
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Old 11-24-2008, 12:18 AM   #5
Big Daddy Big Daddy is offline
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Impedance is not a constant thing. It varies quite a bit with frequency. The impedance of an 8 ohm speaker can go up to 40 or go down below 5. Most high-end receivers should handle loads above 6 ohm without difficulty. However, I would hesitate to use a receiver with 4 ohm speakers. That is one reason we have separate amplifiers that can handle low impedance speakers. Please read the thread on Impedance & Sensitivty of a Speaker. It has sticky under Speaker Discussion.
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Old 11-24-2008, 01:48 PM   #6
welwynnick welwynnick is offline
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From an amplifiers point of view, there's nothing difficult about a 12 ohm load.

It is reactive (capacitive and inductive) and low impedance loads that are the problem.

Receivers often have 4 ohm settings, but these generally don't increase the low-impedance drive capability, they just limit the voltage that can be generated. The 4 ohm setting usually more than halves the max power.

Nick
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