4 ohm speaker with 6-8 ohm rated receiver? - AVS Forum | Home Theater Discussions And Reviews
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Old 12-12-2013, 08:18 PM - Thread Starter
hma
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I'm thinking of adding a 4 ohm Thiel SCS3 center channel speaker to my system to accompany 8 ohm Mirage surrounds and DCM Time Window 6-8 ohm L & R speakers with a Yamaha RX-V1400 receiver. The receiver only has settings for 6 or 8 ohms. 4 ohms is not mentioned.

Is this setup safe? If so, should I set the receiver to 6 ohms or 8 ohms?

Thanks!

BTW, I have the Thiel speaker (moving down from my other theater setup), so I'm willing to experiment as long as it's safe!
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Old 12-13-2013, 01:58 AM
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Shouldn't be a problem and certainly not at moderate volume levels.

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Old 12-13-2013, 06:20 AM
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Smoothie is right. To confirm know that I do it every day.
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Old 12-13-2013, 03:36 PM - Thread Starter
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Thanks. I will try it. Any thoughts regarding setting the receiver to 6 ohms vs. 8 ohms?
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Old 12-13-2013, 05:58 PM
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6 ohms.
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Old 12-13-2013, 06:52 PM
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Set to 8 Ohms..
Better sound and dynamics, plus more power...

Just my $0.05... 👍😉
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Old 12-13-2013, 07:13 PM - Thread Starter
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Guess I'll have to try both and compare. Will try to do it Sunday. THanks!
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Old 12-14-2013, 09:33 PM - Thread Starter
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Well it worked! Speakers sound fine running at either 6 or 8 ohm setting. I'll have to do more experimenting to see if one is better than the other. No amp shutdown despite loud Blu-ray soundtrack. Thanks all.
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Old 12-14-2013, 11:17 PM
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All a 6 ohm setting does is set a cap on the maximum power draw of the amplifier, its like listening with training wheels on.
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Old 12-15-2013, 10:58 AM - Thread Starter
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Hmm. So why are the power ratings HIGHER as the setting goes from 8 to 6 to 4 ohms?
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Old 12-15-2013, 11:58 AM
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Quote:
Originally Posted by hma View Post

Hmm. So why are the power ratings HIGHER as the setting goes from 8 to 6 to 4 ohms?

Because the switch kicks in a lower voltage to the amplifier, since current increases as the Ohms decrease so the amplifier doesn't overload..

Just my $0.05... 👍😉
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Old 12-15-2013, 12:34 PM
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Quote:
Hmm. So why are the power ratings HIGHER as the setting goes from 8 to 6 to 4 ohms?

Probably because the voltage swing is the same but the lower Impedance draws more current. Same voltage, higher current draw means more power.
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