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speaker compatibility


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13 replies to this topic

#1 of 14 OFFLINE   AndrewKra

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Posted January 12 2005 - 07:49 AM

I have speakers that are rated at 4 ohms. I was wondering if this meant I cant even get a receiver that is more than 4 ohms or if i can get one but just shouldnt turn the speakers up too far?
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#2 of 14 OFFLINE   Jack Briggs

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Posted January 12 2005 - 08:47 AM

Andrew: "Ohms" are specific to speaker systems. And the resistance (i.e., 4 ohms, 8 ohms, 6 ohms, whatever) varies over a speaker's response curve. So, what you have is a nominal rating. In general, most transistor amplifiers put out more power the lower the ohm-rating at a given level of the frequency response. JB

#3 of 14 OFFLINE   AndrewKra

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Posted January 12 2005 - 10:49 AM

ok thanks, but does that mean i can use a 8 ohm receiver with my 4 ohm speakers.
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#4 of 14 OFFLINE   Ted Lee

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Posted January 12 2005 - 11:08 AM

Posted Image

you can, but you should be careful. if you use a speaker system with a lower impedance rating then the receiver can handle, you may make the receiver "work harder" then it's designed to.

here's the analogy i usually use.

my honda is rated at 8-ohms and can go 60 miles an hour. if i use 4-ohm speakers, now my car is going 120 miles an hour. yes, it can do that ... but for how long before the thing blows up?
 

#5 of 14 OFFLINE   AndrewKra

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Posted January 12 2005 - 11:11 AM

so I should really be more worried about the receiver frying than the speakers?
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#6 of 14 OFFLINE   Bob McElfresh

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Posted January 12 2005 - 04:35 PM

Quote:
so I should really be more worried about the receiver frying than the speakers?

Yes.

Think of a direct short from 2 ends of a battery or two wires. The lower the resistance -> the closer to a direct short. Your receiver will keep trying to push out the power and over-heat.

4 ohm speakers are fine even on a receiver that says "8 ohms". But - you need to be careful to not turn the volume too-far up, and make sure you have lots of good venting around the receiver to help keep it cool.

#7 of 14 OFFLINE   John Garcia

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Posted January 12 2005 - 06:35 PM

Your Honda is going 120mph, but it is running at 16,0000 RPM to do it. In other words, that "extra" power isn't free, it still has a cost, and that is heat - more wear and tear on the receiver. You are also more likely to reach the limits of the amp more quickly, and the risk there is greater for your speakres than your receiver if you drive it to clipping.

A decent 8 Ohm receiver (90% of receivers are 8) will be able to handle 4 Ohm speakers, especially if it is only 2 out of your whole set vs all of them.
HT: Emotiva UMC-200, Emotiva XPA-3, Carnegie Acoustics CSB-1s + CSC-1, GR Research A/V-1s, Epik Empire, Oppo BDP-105, PS4, PS3,URC R-50, APC-H10, Panamax 5100 Bluejeans Cable
System Two: Marantz PM7200, Pioneer FS52s, Panasonic BD79
(stolen) : Marantz SR-8300, GR Research A/V-2s, Sony SCD-222ES SACD, Panasonic BD-65, PS3 60G (250G)

Everybody is a genius, but if you judge a fish by its ability to climb a tree, it’ll spend its whole life believing that it is stupid.” – Albert Einstein

 


#8 of 14 OFFLINE   Ted Lee

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Posted January 13 2005 - 06:38 AM

Quote:
Your Honda is going 120mph,
i wish! Posted Image

also, some receivers have an impedance switch in the back. i think they usually only go to 6ohms (?), and i'm not sure how well they really work ... but i guess it wouldn't hurt to put it at the 6 (or 4) ohm setting.
 

#9 of 14 OFFLINE   John Garcia

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Posted January 13 2005 - 07:42 AM

I've heard that using the switch on receivers that had one was not a good idea.

I had my Integra up to an indicated 138 Posted Image
HT: Emotiva UMC-200, Emotiva XPA-3, Carnegie Acoustics CSB-1s + CSC-1, GR Research A/V-1s, Epik Empire, Oppo BDP-105, PS4, PS3,URC R-50, APC-H10, Panamax 5100 Bluejeans Cable
System Two: Marantz PM7200, Pioneer FS52s, Panasonic BD79
(stolen) : Marantz SR-8300, GR Research A/V-2s, Sony SCD-222ES SACD, Panasonic BD-65, PS3 60G (250G)

Everybody is a genius, but if you judge a fish by its ability to climb a tree, it’ll spend its whole life believing that it is stupid.” – Albert Einstein

 


#10 of 14 OFFLINE   Ted Lee

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Posted January 13 2005 - 09:01 AM

138? Posted Image

best i ever did was about 120ish in my rx-7. tbh, i'm not quite sure because i was too afraid to take my eyes off the road and look at my speedometer. :b
 

#11 of 14 OFFLINE   John Garcia

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Posted January 13 2005 - 11:28 AM

My friend has a pic of his speedo pegged all the way over at 155 heading back from Sacto! Posted Image (Supercharged Integra). I don't think I would have been able to take a pic of that...
HT: Emotiva UMC-200, Emotiva XPA-3, Carnegie Acoustics CSB-1s + CSC-1, GR Research A/V-1s, Epik Empire, Oppo BDP-105, PS4, PS3,URC R-50, APC-H10, Panamax 5100 Bluejeans Cable
System Two: Marantz PM7200, Pioneer FS52s, Panasonic BD79
(stolen) : Marantz SR-8300, GR Research A/V-2s, Sony SCD-222ES SACD, Panasonic BD-65, PS3 60G (250G)

Everybody is a genius, but if you judge a fish by its ability to climb a tree, it’ll spend its whole life believing that it is stupid.” – Albert Einstein

 


#12 of 14 OFFLINE   Brad E

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Posted January 13 2005 - 01:14 PM

Well since we're already off topic. The fastest I've gone is and indicated 295 kph (around 181 mph, I think) on my Kawasaki ZX-12r.

I've tried many times to hit the speed limiter, which is supposed to be at 300kpm/186mph, but I either come up on a car or hill and have to back off.

#13 of 14 OFFLINE   Ted Lee

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Posted January 13 2005 - 02:43 PM

180 on a bike brad? man, you either got cajones the size of cantalopes or you just cuhh-razzzyyy!
 

#14 of 14 OFFLINE   Brad E

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Posted January 13 2005 - 02:52 PM

Well I've been called worse. I pick my spots carefully, long straight stretches, no approaches or intersections.

The bike is very stable at that speed.





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