Question about Yamaha RX-V659 Receiver

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Speaker impedance and the Yamaha RXV 463

I have 2 sets of speakers that I'm wanting to connect to this amp.  One set is 4 ohms (old speakers) and one is 8 ohms.  Can I do this?
The manual indicates that I can manually set the impedance to 6 ohms.  Should I set the impedance manually for 6 ohms and hook up all the speakers?  I don't see that I can manually set only one set of speakers at 6 ohms.
So, am I taking any significant risks by hooking both sets of speakers to the same amp.  I did this with my previous amp and it seemed to work ok, however, one channel did fail but I'm not sure that the problem was the impedance.  Your thoughts?
bob patterson

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  • robert w pat Aug 05, 2008

    ginko, thanks for your feedback.  Just to make sure I understand, the higher the number for impedance of a speaker (ie 8 ohms), the LESS efficient the speaker and the more power it takes to run the speaker.  Or, it is the opposite, the HIGHER the number, the MORE efficient the speaker.  So, when and if, I manually set the amp to accommodate  6 ohm speaker, I'm telling the amp to get ready to operate with LESS efficient speakers that it is set up to do.  Have I got this?

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You risk to crash a set of speakers. In any case this will have a detrimental effect on the sound

Posted on Aug 04, 2008

  • Ginko
    Ginko Aug 04, 2008

    If you do not pump the volume it will work fine , device impedance is 6 ohms, I do not think it will damage the 8 ohms speakers, only the result in terms of surround and sound distribution won't be better than using two 4 ohms speakers.

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Y does my technics sug88 say low imp beside the a and b speakers


Because you've done something with the speaker connections that's too low impedance for the amp.

Amps need a certain level of resistance from the speakers otherwise there's a risk of the amp blowing itself up. Impedance is the name for resistance that varies with audio frequency. If the speakers you connected are any good, then there'll be label on the back telling you their impedance in Ohms.

When running a single set of speakers only then the amp would prefer an 8 Ohm load but it will accept a 4 Ohm load. If you plan to run speakers in both the A and B sockets, then both sets of speakers have to be 8 Ohms and no less. It also tells you this on the printing directly above the speaker sockets on the amp.

The amp is trying to protect itself from an overload situation where it would blow its output transistors and possibly kill your speakers too.

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I want to hook two speakers on each terminal (L/R).


The correct way would be to hook only one speaker to the powered outputs and use PRE-OUT outputs to connect separate amplifier (or active speakers).

For 2 speakers to work connected to the same powered output of receiver, their impedance would need to be high enough. Yamaha receivers officially support impedance >= 4 ohm for front speakers. If you would connect 2 different 8 ohm speakers, the combined impedance could be theoreticcaly 4 ohm, but that depends on many parameters. On low volumes it should work, but could overload the receiver if used for louder volumes.

Also note that the impedance is a function of frequency (specific to every speaker), so for different frequencies the power from receiver would be devided differently between the speakers and the sound would not be good.

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Impedance setting on Yamaha AV Receiver


Hi. You can always use a Receiver with an output impedance that is lower than the speakers input impedance.Problems arise when you try to use a Receiver with a higher output impedance than the Speakers input impedance.

Receiver 6 ohms speakers 8 ohms......YES..
Receiver 8 ohms Speakers 6 ohms.......YES, WITH CAUTION

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CAN I CONNECT BOTH MONITORS AND SPEAKERS (S215 AND SM'S) TO A YAMAHA P5000S AMP?


You could use this amp as effectively 2 separate mono amplifiers - using one channel to power the monitors and one to power the main speakers.
Alternatively you can run the amp in stereo connecting one set of speakers to the neutrik outputs and one to the jack outputs. In this case the amp output will be shared equally between the two sets of speakers, which are in parallel, and the combined impedance must be not less than 4 ohms.

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Do you mean you want to connect 2 pairs of speakers, or just 2 speakers like you say in your question? There are 4 pairs of screws on the back of your amplifier on the upper right side of the rear panel near the fuse cap and the AC outlets. Each pair of screws will be connected to one speaker. Your Onkyo can be connected to 4 speakers. If you want to connect only 2 speakers, use the screws labeled "SPEAKER A" and connect the speakers to the left and right channels, and make sure you connect the + speaker wire to the screw with the red marking around it. Connect your other speakers the same way, one speaker per pair of screws.

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I have a punch 1000 amp and 1 l7 15 and i need to find out how i can get it wired and adjusted to 2 ohms please


I am not familiar with "I7 15" but will assume it is a speaker. Please correct me if I am wrong. As for the amp setup:
The amp output impedance is not adjustable. The amp is rated at 1 ohm which means you can connect any amount of speakers onto the output as long as the sum total of the load you connect to the amp is not less than 1 ohm.
Speaker impedance is also not adjustable but the total load connected to an amp can be altered by altering the way the speakers are connected to the amp.
The formula for calculating impedance looks very complicated but is quite simple.
First you have to understand the difference between series and parallel connections.
See diagram.
Series: Connecting 2 or more speakers by using the negative on one speaker connected to the positive on the next speaker.
Parallel ( // ) : Connecting the positive of a speaker to the positive of the next and the negative of the speaker to the negative of the next.
suzman_9.jpg
Connecting speakers in series is handy when you have two 500 watt speakers for instance and want to run them off an 1000 watt amp. Connecting them in series will assure that you dont over power the speaker and damage it. When connecting speakers in series the total of the impedance of the speakers is the impedance of each individual speaker added together. In our example the total impedance will be 2+2+4=8ohm
The parallel connection impedance calculation is a bit more complex.
1/Rtotal = 1/R1 + 1/R2 + 1/R2
1/Rtotal = 1/2 + 1/2 + 1/4
Rtotal = 0.8 ohm

If you have Microsoft Excel installed in your computer you can enter the following formulae as shown into the spreadsheet. After entering the formulae you must enter the values of the speakers into fields A2, B2 and C2 and it will calculate the total impedance for you.
Using less speakers just remove C2 from the formula.
Using more speakers add for instance D2 into the formulasuzman_8.jpg
For your specific amp make sure the load you connect is not less than 1 ohm. It is safe to connect more than that but using less will result in the amp protection circuitry to be activated.
If you use one speaker only then there is no adjustment to be made.
Your particular amp can also connect to an additional amp( and speaker) by using the "PASS-THRU" connectors. This saves you from using an additional set of signal wires from the head unit.
I hope that you now have a better understanding of amp wiring.
If you like you can leave a comment with the specs of the speakers you want to use (wattage and impedance) and I will draw up a diagram for you to use when wiring the system.

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1 Answer

Yamaha RX-V465 switches off when increasing volume beyond -21.0dB


What speakers you have connected? This receiver supports only 6 and 8 ohm speakers (not 4 ohm). Also check if the ohm settings are correctly set in Advanced Setup (in standby press on the front panel STANDBY while holding STRAIGHT button). In this menu check the setting SP IMP. (speaker impedance) if it maches your speakers (6 or 8 ohm).
Disconnect all inputs and also all speakers. With nothing connected, try to increase the volume. If it still will power off, the unit is probably faulty and should be repaired.
If it does turn off only with speakers connected, check the speaker wires and the speakers, the problem will be there.

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Officially this receiver supports only 6 and 8 ohm speakers. But for surround speakers it should not do any harm, because they are not played at full volume. But be sure to set yamaha for 6 ohm speakers.
Using only 4 ohm speakers makes the amplifier work more hard and produce more heat, that's why you can't use it at high volume.

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The manual says...

"If you are to use 6 ohm speakers, be sure to set the "SP IMP" to "6 ohm Min" before using this unit (see page 30). 4 ohm speakers can be used as the front speakers (see page 118)." ... which basically says the same thing in a table.

Set it for 6 ohms and try ity out. If it exhibits any problems like the amp cutting off you might want to lower the volume or analyze it to see if the 4 ohm guys are the problem.

BTW: That spec is just a nominal value. At various frequencies every speaker's impedance changes. The proof is in the pudding. The Yami won't self destruct unless you crank it to the stops and ignore the audible warnings of stress.

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