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Zone Pocket
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The different circuitry design within an amplifier can be determined by classes. The audio amplifier's class refers to the output stage of the amplifier. There are several classes:

Class A - Class A amplifiers produce very low distortion. The distortion is the lowest when the volume is low. However, Class A amplifiers are extremely inefficient, thus they are not suitable for designing high power models like most multi zone amplifier in the market.

Why do they manage to produce low distortion? The transistors in Class A amp are biased in a way that they are only half working when the device is idle (at this point the semiconductor devices are most linear in behavior). From this, a lot of power is wasted even though there is no audio from the device.

Due to the working mechanism of Class A amps, they are often used for signal level circuits. Premium Class A audio amp are sometimes used by the choosiest audiophiles.

Class B: Class B amp are meant for lower cost circuit designs. Sound quality is not a priority. However,do bear in mind, Class B amplifiers are more efficient than Class A amplifier. However, distortion is rife when signal level is low (the term is called "crossover distortion").

This is selected when design cost is emphasized. This class of amp is formerly used in pocket transistor radio, clock radio and anything portable whereby sound quality is not important.

Class AB: This class is widely used in home stereos and normal audio amplifiers. Class AB amplifiers boast about the best of A and B. Think of the efficiency of Class B and the better distortion performance of Class A amplifiers.

In AB amplifiers, distortion would deteriorates when the signal gets lower. They usually make use of pairs of transistors which are biased slightly "on". The reason is to eliminates crossover distortion which happens in Class AB amps.

Class C: Never used for audio circuitry and usually operate the output transistor in a state that produces tremendous distortion. C amplifiers are most commonly found in RF circuits whereby such crude signal is acceptable. They are extremely efficient though.

Class D: This class of amplifier is the most employed in Multi Zone Amplifiers and Multi Zone Audios. D amplifiers use a different method of amplification as compared to earlier classes mentioned.

Class D amplifier operates the output semi-conductor devices as switches (On or OFF) which is vastly different from Class A,B, AB and C operate in the linear mode. Class D 's input signal is compared with a high frequency triangle wave, resulting in the formation of "pulse width modulation (PWM) type signal. This type of signal is also known as 'digital' signal by layman.

PWM signal would go through a special filter which removes all unwanted high frequency by-products of the PWM stage. The output of the filter would drives the speaker. One of the major advantage of using a Class D amplifier is its high efficiency or low power wastage.

Learn more about amplifiers in http://MultiZoneAmplifier.com/.

Bears Woes Extend Beyond The Red Zone

Only seven months ago Bears fans were announcing their return to the Super Bowl with their newly-acquired quarterback Jay Cutler. Despite the apparent step-up from Kyle Orton, the celebration seemed premature to everyone outside of Chicago due to the Bears lack of a number one wide receiver.

Now nine games into the season, the wide receiver position is only the beginning of the team's problems. With every play, Cutler's career appears to be on the brink of extinction with the offensive line providing almost no protection. Cutler seems to get touched on nearly every play having been sacked, hurried and knocked down more times than I can count.

Ron Turner doesn't use Cutler effectively. There's no creativity in the play calling, some calls are just plain dumb, and Cutler's stuck in the pocket, which collapses repeatedly.

The Bears rank 28th in rushing as Matt Forte fails to live up to expectations following a stellar rookie season in 2008. Thursday night's game proved to be one of his better this season. However, he excelled in the air with 8 receptions for 120 years while the running game was once again dismal with only 41 yards on 20 carries.

The Bears defense has been so plagued by injuries and stupid mistakes (yeah, that means you Tommie Harris), that they can't be relied upon to carry the team as in years past. Although they miraculously found a way to keep Chicago in the game, giving the offense a chance to win on the final drive.

But the blame can't fall solely on the supporting cast. Confidence in a quarterback is essential, but he tries to make plays that aren't there. Granted three of tonight's five interceptions against the 49er's were not his fault. Devin Hester slipped and fell, the referee got in the way on another, and a possible interference went uncalled against San Francisco safety Mark Roman.

The other two interceptions occurred where they count the most as the red zone proves to be a dangerous area for Cutler who has thrown five interceptions inside the 20 this season.

The only real bright spot on the team is third-year tight end Greg Olsen who raked in three touchdowns in a lopsided loss to the Arizona Cardinals last week. Olsen leads the team in touchdowns with six, and is fourth in receiving yards.

And for reasons unknown to any sane person, Turner sat Olsen on a pivotal play in the first half. On third and 1 offensive tackle Kevin Shaffer was made eligible in an effort to trick the 49er's. But the only person tricked by this play was Cutler who was led to believe that San Francisco's Aubrayo Franklin had switched teams as he threw the ball straight into the defensive tackle's hands.

Cutler has the ability to lead this team, but he needs help. The Bears should already be thinking about how they can build around him in the off-season. Of course, they could have tried to get Cutler some help in the 2010 draft, but they gave that first round pick to Denver back in April.

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Does anybody else think the P'Zone is a waste?

A pound of meat my ass! I ordered a P'Zone from Pizza Hut not long ago and I was sadly disappointed. What I got looked like a large Hot Pocket that you pop in the microwave and nuke it for 3 minutes. It seems to me that a better alternative would be to go to an Italian Restaurant and order a calzone. Did I just go to Pizza Hut on a bad day? Is the P'Zone really just an over-sized Hot Pocket?

I think there is more crust than there is meat. To me, it is just a Hot Pocket on steroids.

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