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Ultra Linear
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Wearwell 414 15/16'' Ultra Soft Diamond Plate Mat 2' x Linear Foot |
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Woofer (in., cm) 6-1/2, 16.5Tweeter (in., cm) 1/2, 1.3Impedance (Ohms) 4Max Rec Amp Power (watts PEAK/RMS)* 100/50Sensitivity (dB 1w/1m) 90Frequency Response (Hz) 40-20kMounting Hole Diameter (in., cm) 5-1/2, 14Mounting Depth (in... |
Here are some more information for Ultra Linear:
For those of you considering a lens purchase in the near future, the following lens characteristics are important to understand and consider when researching the best buy for you. The terminology and concepts are used to sell better-quality lenses, so study the list below, and be on the lookout for what counts!
Internal Focusing (IF)
Characteristics: The movement of the lens for focusing purposes is internal to the lens body, so no lens ring will cause the lens to twist out and interfere with the orientation of any filters. (Some filters, such as linear polarizers or graduated neutral-density filters require stationary positioning in order to deliver predictable results.) This internal movement also allows the lens weight to stay balanced, which helps the balancing of heavier lenses on a tripod. Image quality of newer IF lenses is slightly better than non-IF lenses due to technological advances made that correct some aberrations.
Image Stabilization (IS) or Vibration Reduction (VR)
Characteristics: Most types of lenses above come in two flavours: either with image stabilization, or without. Built-in stabilization allows you to get sharp hand-held images when lighting conditions are poor, or you're shooting from a moving vehicle. On the lenses that offer this capability, there is usually a switch that lets you turn the feature off, thus saving batteries when using a tripod. Beware the cost of these lenses, though: you can expect to pay 2-4 times as much for a lens with image stabilization than the same lens without.
=> Uses: hand-held photography (i.e. no tripod)
Constant vs Variable Aperture
Characteristics: Variable aperture accounts for the majority of zoom lenses, and causes the maximum aperture to decrease as you zoom from wider focal lengths to telephoto focal lengths. The advantage of variable aperture zoom lenses is that they're cheaper to maufacture and are typically lighter and more compact than contact aperture lenses.
Constant aperture lenses provide a static maximum aperture regardless of the focal length you're zoomed to. This better enables you to achieve narrow depth of field so as to isolate your subject from your background. These lenses typically let more light in, which lets you shoot sharp photos in dimmer lighting conditions.
Macro Focusing
Characteristics: Macro lenses allow the camera to be very close to its subject and still focus sharply. Macro lenses are ideal for close-up shots of flowers, leaves or insects, and sometimes double as portrait lenses. They typically have a reproduction ratio of 1:4 or better, which means the image sensor will capture the subject at 1/4 its original size or larger.
=> Uses: macro photography
Low-Dispersion Glass
Characteristics: Some lenses are made with high-quality glass specially manufactured to more accurately transmit the full visible colour spectrum, called low-dispersion glass. You may also hear of ED (extra-low dispersion), SLD (super-low dispersion) or UD (ultra-low dispersion), which really just means truer colours.
Apochromatic Lenses (APO)
Characteristics: Apochromatic lenses have high colour fidelity and sharpness and should be used by anyone obsessed with getting to the most accurate colours possible.
Aspherical Elements (ASP)
Characteristics: Aspherical lenses are made with a different curvature than traditional spherical lenses to correct for distortions at the edge of the image. They are particularly useful in wide-angle lenses where vignetting or distortion can be seen in the corners of the image.
Tripod Mounts for Long Lenses
Characteristics: Lenses that are bigger and heavier than your camera body should have a tripod mount built-in. By attaching the lens to the tripod instead of the camera, you will remove tension on the camera-to-lens mount joint, and you will improve tripod balancing in the field. In fact, without a tripod mount, some larger lenses will cause the tripod to topple, thus making tripod use impossible without a lens mount. It is possible to purchase a separate adapter bracket from some manufacturers if the lens itself does not have one.
Plastic Material vs Alloys
Characteristics: Plastic lenses built recently typically use high-tech materials that are very durable and much lighter than metal alloy lenses. So although it used to be said that plastic lenses are cheap and unreliable, that is no longer true today.
Size
Characteristics: Zoom and telephoto lenses are getting smaller and lighter each year. In general, the larger the focal length of the lens, the larger the lens will be physically.
Weight
Characteristics: The heaviness of a lens may be prohibitive to you, depending on your physical fitness level and how long you'll be away from home. Plastic lenses are quite durable and are definitely lighter than equivalent metal lenses, although ultra-lightweight metal alloys are reasonable as well.
Price
Characteristics: In general, no matter which lens you're looking at, prices vary dramatically based on lens quality. Professional lenses will cost you thousands of dollars, while a compact modest starter zoom lens will be only a hundred dollars. You'll pay extra for some of the characteristics discussed in this article, such as fast constant apertures, high quality glass, image stabilization, and quick auto-focus. Remember, though, that lens price is a large investment: lenses will long outlast your camera body, and is largely responsible for the quality of your images (much more so than the camera body itself)!
Teleconverters
Characteristics: Teleconverters are a cheaper alternative to zoom lenses. They're also a lot lighter and smaller to carry around, but then you get what you pay for. Teleconverters force you to have more available light for any particular aperture setting, and image quality will decrease (edge softening and lens fault magnification).
For more lens advice, or to read more photography articles, please visit Jennifer Clarkson's website at http://www.jclarksonphotography.com. To learn more about the books in her eSeries on Digital Photography, or to promote sales, please visit the following sites:
Choosing your camera and accessories
Getting the Most out of your Camera's Basic Settings
What Is A Switching Power Supply?
There are many types and designs of power supplies. This article will describe what is commonly known as a switching power supply, sometimes referred to as a switched mode power supply (SMPS), or 'switcher'.
All electronic circuits require a voltage source in order to operate. In the United States, the most common voltage available to consumers from the electric utility is the 120V RMS nominal alternating current found at outlets throughout homes and businesses. In contrast, most electronic circuits in use today require a stable direct current source with a much lower voltage - usually 3 to 12 volts.
Virtually every electronic device that operates from the AC mains must include a circuit that will derive a different voltage from the 120 volts that the utility provides. This is accomplished by a type of circuit referred to as a power supply. Power supplies can be generally grouped into two classes of operation.
Linear power supply designs are quite common and familiar to most people. They use a 'brute force' method of power conversion and regulation. The AC mains voltage is fed directly to a transformer which converts the 120V AC to the highest voltage required by the circuit it is designed to supply. The lower voltage is then converted to DC via a bridge rectifier, and then regulated by a transistor operating within its linear range - thus being dubbed a 'linear' power supply.
The advantage of linear power supply designs is that they are simple and straightforward. Disadvantages include inefficiency (50% or less), large physical size and weight, and generation of heat.
Switching power supply designs are typically more complex than their linear counterparts. As a result, the SMPS is also more versatile. SMPS design allows for either AC or DC input, and can output either AC or DC voltages, depending on circuit topology.
In a popular AC to DC SMPS design, the incoming AC mains voltage is first converted to DC using a bridge rectifier. This DC voltage is then fed to a 'chopper' stage containing highly efficient MOSFET switching transistors. The gates of the transistors are fed by an oscillator providing a constant frequency, pulse width modulated (PWM) signal (usually in the range of 50 to 300KHz) in order to 'chop' the DC into a high frequency AC voltage. This AC voltage is fed into the primary winding of a high frequency transformer. The transformer secondary winding voltage is then rectified to DC for use in the circuits where it is required. Regulation of the output voltage is accomplished by a circuit that samples the output voltage, and signals the PWM oscillator to vary the ratio of transistor 'on' time to 'off' time to maintain a constant voltage output.
There are significant advantages of this design over the linear design. The high efficiency of the switching transistors (80 to 90%) means less energy is wasted as heat, and the high frequency of operation allows for a much smaller and lighter transformer to be used.
Should an AC input voltage not be available - such as in an automotive application - the designer need only remove the rectifier stage from the power supply input, and use a high frequency transformer with the appropriate turns ratio to provide the desired output voltage.
In summary, the principal advantages of the SMPS are its ultra high efficiency, along with a significant reduction in size and weight. In today's world where efficiency and portability have become more important than ever, the SMPS is quickly becoming the preferred design for power supply circuits.
About the Author
Global Test Supply, LLC is a distributor of test and measurement equipment, and welcomes question from those looking for a DC Power Supply
What 2 subs do you recommend ?
I have 2 Ultra Linear 1500x mono block amps and I'm trying to find some subs.I want to put an amp on each speaker.Either 12's or 15's,I want to just use 2 subwoofers at a reasonable price.
if you want to use the power those amps put out get 2 of these MTX Audio TR7512-44 they are load and heck
Optical Zonu debuts OZ1600 Ultra Broadband Fiber Optic Transceiver for RF over fiber
JUNE 2, 2010 -- Optical Zonu Corp. has introduced the OZ1600 Ultra Broadband Optical Transceiver for RF over fiber-optics links. The new transceiver is designed for operation up to 7 GHz with exceptionally flat frequency response.
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