Anyone using multiple fronts and centers?

**htnut12** · **11-03-07, 01:21 PM**

I use two front left and right speakers my placement options are nil with WAF so I have to improvise. The mains are placed a bit too far apart and fire into the room at an angle toward my listening postion. The augmenting speakers point towards the center of the back wall. Essentially the side of the augmenting speaker is placed along the back of the main speaker. Works great for me and my lovely wife.

The center is augmented with a separate subwoofer placed behind it. No separate power amp in the sub, just a ported box with a sub.

The downside, forget about doing this with a Denon receiver. The Denon is about useless for reference levels in home theater, even with the very efficient Klipsch speakers. It is a great preamp tho. 2307CI. My old HK AVR500 had no problem driving a pair of Klipsches per channel. That now serves as the guest bedroom 5.1 audio setup.

An ADCOM amp just gathering dust put back into service and all is now fine.

When I get all my subwoofers installed I may use some of my pro amps to advantage with the fronts and center.

**doubeleive** · **11-03-07, 08:40 PM**

I Use Dual Center Speakers From The Main Receiver, I Like To Have A Wide Center Channel As Many Movies Have The Audio Coming Out The Center Channel, I Have A 73" Tv So Plenty Of Room For Two Centers, I Also Like Them To Have Good High Output So I Use Two Athena Ws-60 Turned Sideways (they Are Designed To Go Either Way), I Used To Use Dual Front Speakers But Not Anymore, I Have The Centers Under The Tv On The Midle Shelf Of The Stand, Used To Have Them On Top Of My Old Tv But The Tv's Are Super Thin Now So No Room On The Top. Works Pretty Well.

**Kal Rubinson** · **11-04-07, 11:35 AM**

Quote:

doubeleive wrote:

I Use Dual Center Speakers From The Main Receiver, I Like To Have A Wide Center Channel ...................

Of course, using two centers to achieve this is counter-productive.

Kal

**eugovector** · **11-05-07, 10:35 AM**

Kal,

Can you expand upon this? I doubt doubt that the interaction between two speaker can have some cancellation, but if you could fill us in on more of the science behind this, or perhaps link an article, that would be great.

Thanks,

Marshall

**Kal Rubinson** · **11-05-07, 01:31 PM**

Quote:

eugovector wrote:

Kal,

Can you expand upon this? I doubt doubt that the interaction between two speaker can have some cancellation, but if you could fill us in on more of the science behind this, or perhaps link an article, that would be great.

Thanks,

Marshall

Off hand, no. I have explained the issue here and on several other forums (especially AVSforum) many, many times and even dealt with it in my column at one time. However, I would have to start Googling to find any of them, so I will have to leave it to you if you are so motivated.

Basically, it has to do with the wave interaction between any two sources (re)producing the same signals. The interaction corrupts in the plane of their displacement and is relatively benign at right angle to that plane.

Kal

**htnut12** · **11-05-07, 04:57 PM**

Move your head a few mm or inches depending on the frequencies involved and you can get reinforcement or cancellation with your two ears. I think sometimes way too much is made of minutia.

**Kal Rubinson** · **11-05-07, 05:12 PM**

Quote:

htnut12 wrote:

Move your head a few mm or inches depending on the frequencies involved and you can get reinforcement or cancellation with your two ears. I think sometimes way too much is made of minutia.

Those changes can be due to many things, some of which are avoidable (such as speaker orientation and placement) and some are less tractable (such as boundary reflections at low frequencies). It also depends on how and to what you listen.

Kal

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