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September 5, 2010

A/V Question of the Month: VP180 Port Distance From Wall?

Q. I read on the Axiom forums that the M80’s can be placed as close as 2 inches from the back wall. I’m hoping the same is true for your new VP180 centre speaker (this is important to me as the room I have has an angling bulkhead, which means I would need to mount the projector screen on the ceiling fairly close to the wall). Can you please comment on how close the 17-inch-deep centre channel should be placed from the wall? —B.P

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August 3, 2010

Question of the Month: Lightning Damage to Plasma?

Q. Lightning either hit our house or very close to it last week, and the plasma TV I was watching lost its picture, as did a computer screen my wife was using. When she re-booted the computer, it worked, but the TV isn’t working. I am trying to get a feel for the most likely culprit. Normally, I would just figure the TV itself is damaged. However, the menus for the TV show on the screen. I just don’t get a picture. Is the fact that I can still see the menus from the TV an indication that the TV itself may not be the issue? I would have thought that if the screen was damaged such that I can’t see a picture, I’d also not see the menus.

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July 9, 2010

Question of the Month: Why 4-Ohm Impedance?

Filed under: Question of the Month — Tags: , — Alan @ 12:10 am

Q. What are the advantages of 4-ohm speakers? Why did Axiom choose an impedance of 4 ohms instead of 8 ohms for the M80s? – T.M.

A. Impedance is complicated and frequently misunderstood. A speaker designer doesn’t “choose” speaker impedance. The overall impedance is dictated by the number of drivers and the crossovers. It is an electrical characteristic that reflects the total current draw of all the wire in the voice coil of each driver plus the two crossovers (for the M80). You will find most very large tower speakers like Axiom’s M80, which has six drivers, will typically have around 4 ohms impedance. Other smaller speakers typically have 8-ohm impedances because they use only two drivers and one crossover.

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November 1, 2009

A/V Question of the Month: Power for Bass Notes

Q. I would like a technical explanation as to why it requires more power to recreate a bass note. Also, I find several references about crossovers dividing frequencies. I would like an explanation as to how the crossover diverts the majority of the power from the input signal to the woofer when using a single amplifier. — Bryan

A. Thanks for your e-mail and interesting questions.

All audible sounds have wavelengths. Bass sounds that are reproduced by a woofer have long wavelengths. Think of big ocean waves. The wavelength is the distance between the peak of one big wave to the peak of the next.

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