|   Impedance question with Yamaha receiver ? | Debra
Jun 4, 2001 2:22 PM | | I never gave it much thought until I added two "b" front speakers to the "a" front speakers on my Yamaha. The Yamaha has a rear impedance switch with two settings (left= 4 ohms) and (right=) 8 ohms.Both sets of speakers are nominally 8 ohms.The manual states that in this case, the "b" set would have to be 16 ohms. I checked this as an after thought. The point is, it appears that anytime you use two sets of fronts, the receiver ought to be set to the left on the 4 ohm setting, unless you have one of those odd sets of 16 ohm speakers. Now the questions: 1. what is proper setting if one set of fronts is 8 ohms and one is 6 ohms. 2. Does the ohm setting dictate what the rears and center must be? 3. Does changing the ohm switch change the efficiency at which power is distributed to the various speakers 4. Does any of this really matter. I'll bet most owners never give it a thought and leave the switch at 8 (to the right) which is the factory setting, and never have a problem, no matter what they hookup. Maybe thats the problem with this site, you start learning and worry about crap needlessly-but seriously, I am interested in getting a rudimentary understanding of the subject. |
| re: Impedance question with Yamaha receiver ? | A
Jun 5, 2001 12:44 PM | | Okay, you might want to contact Yamaha for advice on what to do with the particular equipment involved. However, from what you say, it appears that the two sets of front speakers are wired in parallel when they are both run at the same time. This means that two 8 ohm speakers (if they were truly 8 ohms) would present a 4 ohm load to the receiver (I said "if they were truly 8 ohms" because impedance varies with frequency, so that your speakers present the receiver with different impedances at different frequencies). With an 8 ohm and a 6 ohm speaker in parallel (if they were truly 8 and 6 ohms), you would have about 3.4 ohms, which is lower than you should use with your receiver, if it is properly labeled.
For more details, I suggest reading:
http://forums.consumerreview.com/crforum?14@@.ee7aa3c/7 |
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