CheckList -

[zumbo]

<font color='#000000'>Leave it set at 8ohms. It will produce more power this way.
Impedance Selector Switch

I recommend the “Minimum 8 ohms” setting even for 4 ohm speakers of moderate efficiency (&gt;89dB SPL). Yamaha includes a” 6 ohm” setting to satisfy UL as well as easing consumer concerns about driving low impedance loads. These switches step down voltage feed to the power sections which can limit dynamics and overall fidelity. My advice is to keep the switch set to “Minimum 8 ohms” regardless of the impedance of your speakers and ensure proper ventilation of the Receiver.

This is from Audioholics review of the 2400. You can get many answers from the review. here:

6th Ave has them. Don't know how much information you need.
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[Ross]

<font color='#000000'>&quot;These switches step down voltage feed to the power sections which can limit dynamics and overall fidelity.&quot;

This is basically a safety mechanism of the receiver. &nbsp;This keeps it from trying to demand too much juice from the unit. &nbsp;

I would agree that one can use the 8ohm position for most applications. &nbsp;However, if a person needed to use the 6ohm position for their speakers, I'd probably recommend a seperate amplifier to supply the amount of current needed, instead of potentially operating in a &quot;safe mode&quot; and not giving your speakers what they really need. &nbsp;

We all have to remember, that even those cute little &quot;full range&quot; bose sattelites may even need external amplification to be fully exploited... &nbsp;

Basically, the 6ohm position is pretty worthless, its just a tool to satisfy the UL for leagal reasons. &nbsp;On the other hand, if its used, then you are probably short-changing your speakers in the process...

If I had the $$$ right now, I too would probably jump on those studio's, I just didn't want to promise you anything as to the subjective aspects of any given speaker. &nbsp;I may like them and you may not...and visa versa... &nbsp;With the amount of subjectivity in the capabilities of a speaker, there are no absolutes.

best,

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[dmoss]

<font color='#000000'>The manual for my Yamaha surrounds suggests 6 ohms. &nbsp;They are ceiling mounted 5.1's. &nbsp;Does it hurt to run them in 8 ohms</font>

 

[zumbo]

<font color='#000000'>NO! As long as the receiver does not go into protection mode, it will be fine. Be sure to have plenty of breathing room for the receiver. I had my 4ohm Quarts on my 1400 &amp; it never shut down!

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[m1abrams]

<font color='#000000'>NO! As long as the receiver does not go into protection mode, it will be fine. Be sure to have plenty of breathing room for the receiver. I had my 4ohm Quarts on my 1400 &amp; it never shut down!

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Speaking of breathing room, how much would the 2400 need safely? The reason I ask is because I am planning on getting one (actually trying to decide between a Yamaha 2400 or the Denon 3805). The location for the reciever would be in a cabinet. The reciever would sit on a shelf by itself with about 2 inches on either side and 7 inches above, NOT stacked with any thing else. The cabinet is solild wood except on the back where it is thin cardboard with vent slits in it.

Concerned if this is enough room to cool any amp/reciever of the size of the two mentioned above.