Acoustic Research AR9LS owners? Just for thought

Agarrison, you need to search the link to Classic Speakers and go to the AR section and find information on the design of the AR-9 series. It all relates to room loading, frequency range of woofers and mid-woofers, and crossover points. Then you may better understand about placement. They will certainly play music out from the wall but you will be sacrificing their intended performance.

Your other speakers may be fine. But they might also improve with greater distance from the front wall. Normally bass information loads up (increases) near room boundaries (wall/floor/ceiling intersections). Placing most speakers too close to walls, and especially corners, results in excess bass loading. Some folks may like this as it produces more apparent bass, but it will not be clean and accurate bass. The AR-9 series was specifically designed to overcome this rule of acoustics.

I'm not familiar with any Yamaha or Pioneer gear so can't help there. My comments on amp power are a general guideline. Many people believe you should get x 1.7 to 2.0 the 8 ohm rating into 4 ohms. Thus a 100 watt amp at 8 ohms should output 170 to 200 watts into 4 ohms. Some amps may not even be fully stable into 4 ohms but any competent design should be.

WOW, thanks for the response guys. Here is another bone to throw at you to chew on. My yamaha has an option on it to run "auto class A" whatever that means. I have done some research on class A power but its confusing to me to say the least. I have noticed no audible difference when i use the class A setting but it does seem to run a lot hotter. Can anyone explain?

What I suspect is occurring - is that most amps operate in class a/b which means that its initial gain is in class a but it switches to class b at a very low levels. This switching from class a to b gives your amp the ability to operate up to a high power output but the switching can cause sonic issues some folks are sensitive to. So enter class A where the amp operates only in class A up to its rated power. No switching distortion, lower power, runs hot(er), and costs a lot of loot. A lot!

What I ASSUME Yamaha has done (remember there is no free lunch - no one is giving pure Class A amps for nothing) is that in 'auto class a' the Yamaha's class a is running up to a higher level before you switch to class b, so if you have efficient speakers you will never encounter the problems switching might intoduce. Its still a Class A/B amp, just smoother at higher power levels.

This is very common in Class A/B amps except most don't usually have an option and the class a power levels vary. Some manufacturers have the level high enuf that they try to pass off the amp by implication as pure Class A.

Hope that helps a bit.

It sure did help Newbee, so would you recomend I just leave the auto class a OFF due to these AR9s not being what you would call efficiant or would you say that the class A power will do better with them. In your opinion

Yep. Especially if you can't hear a difference. That would be the only benefit and you might not be the only person who can't hear it. It is rather subtle.