Axiom Home Page Forums General Discussion Home Theater Looking to get Axiom speakers but need some advice

Well, let's get together and hook up you little Yammie with the M80's and see what SPL it will get to before/if it shuts down.

Well mdrew tested the RX-V661 amps with his M80s, they approached 100db I think before they shut down...I am more interested in the upper range amps (from the new 3800) and see how they perform with M80s.

Zak,

I have an older Yamaha Receiver RXV-657 and it can be set to drive 4 ohm speakers. Read the manual to see how to change the settings.

.... Heck, spent a couple of minutes @ yamaha.com and here is what I found.

Page 33 "Setting the speaker impedence" tells you exactly how to flip between the 8 and 4 ohm settings.

Axiom support - if you are reading this thread, please note this feature re: the yammies.

It's generally considered 'round these parts to be a bad idea to flip that switch. It just limits current and can cause more problems than it solves.

I purchased the VP150 center channel speaker today.

I have decided to hold off on the towers for now until I have a better understanding on the ohms issue with Yamaha receiver.
I want the M80's as I know they are the better speaker but I don't want to run into any issues.

Zak

I think that solidifies my thoughts on M80s versus M60s and my Pio 94. If I could only get 100db and it shut down, I would not be happy I think. Do I normally push it that hard? No. But then again the other day when everyone was out and I was working in another room, I had it up. Came back in and measured. 103db. Then again, I do have hearing deficiencies.

Robb, I think that is why they don't recommend Yamaha, as they can't guarrantee some one won't buy a lower end one and be mad that they could only get 100db or less(?)and it shut down. Are the higher end ones better, I don't know but I think if it is in the RXV line they all have the same power supplies.

Meanwhile even the low end Denons drive the M80s with out trouble. I have had my 1804 upto 105db for a few hours with out problems and ran 1.3ohms for an hour or so. I haven't pushed the 3808 yet.

M, numerous times here and elsewhere it's been pointed out that the "feature" involving a lower ohm setting is worse than useless if performance is the criterion. This is simply a safety related setting intended to help prevent overheating. If the units in question don't pass the UL temperature tests when driving a 4ohm load, the setting is required for liability reasons. It functions by reducing the maximum voltage that the power supply section of the unit can output and, because of Ohm's Law, when the maximum voltage is reduced so is the maximum current and power. So, although it reduces the chance of overheating, it likewise reduces the maximum performance possible. Lab tests have indicated that the maximum power is reduced on the order of 1/3 to 1/2.

Regardless of the ohm rating of the speakers used, the setting should remain at 8ohms. All amplifiers are 4ohm capable, the question is how capable. It shouldn't be assumed that the particular source material used in a particular setup at a particular volume level won't be handled well.

If it were me, I would move the QS8's to the sides and mount them on ceiling brackets since you have a window on one side. The surrounds are key to creating that enveloping feeling which you will negate a bit by having them behind.

Since you already have the rear wired just put some bookshelves up and you have a 7.1 system. I am assuming from your setup the cost of an extra set of small speakers is not an issue.

You have a great room with an awesome home theatre setup. Why go to all this planning and expense and then compromise on it in the final stages?

It sounds like you are hung up on what you have done already. If you just want it to be done you will still have a great sounding system, and depending upon how much you are into the theatre experience, you may not even notice it isn't quite right until you are in a properly setup room. I think most here would move the rears to the sides at least.

If it were me, I would move the QS8's to the sides and mount them on ceiling brackets since you have a window on one side. The surrounds are key to creating that enveloping feeling which you will negate a bit by having them behind.

Since you already have the rear wired just put some bookshelves up and you have a 7.1 system. I am assuming from your setup the cost of an extra set of small speakers is not an issue.

You have a great room with an awesome home theatre setup. Why go to all this planning and expense and then compromise on it in the final stages?

It sounds like you are hung up on what you have done already. If you just want it to be done you will still have a great sounding system, and depending upon how much you are into the theatre experience, you may not even notice it isn't quite right until you are in a properly setup room. I think most here would move the rears to the sides at least.