Power Amp Amplifier
Mar/090
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Crown XLS 202 Two-channel Power Amplifier 200 watts per channel at 8 Ohms List Price: $389.00 Sale Price: $147.28  |
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Crown's XLS Series represents a new era in affordable, quality power amplification. The line consists of four models in a uniform, rugged 2U chassis, incorporating the best of tried-and-true design principles and innovative features... |
Power Amp Amplifier
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 Crown D 150A D150A Series II Power Amplifier Amp  US $49.99
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 New 2400 Watt 19 Pro Rack Mount PA Amp Power Amplifier US $149.99
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 Samson Servo 260 Power Amplifier Amp US $29.99
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 New 1000 Watt 19 Rack Mount Pro PA Amp Power Amplifier US $99.99
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 NEW CROWN XTI 1000 STEREO POWER AMPLIFIER AMP XTI1000 US $389.00
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 New 3600 Watt 19 Pro Rack Mount PA Amp Power Amplifier US $168.88
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 Powered Mixer Mixing Power Amp Amplifier Pa System US $169.00
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 Soundtech STX800 power amp Sound Tech amplifier US $99.99
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 Crown D 75 Power Amplifier D 75 Amp Audio 1 Rack Space US $179.00
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 Soundtech STX1600 power amp Sound Tech amplifier US $149.99
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 NEW CROWN XLS 202 STEREO POWER AMPLIFIER AMP EXCELLENT US $239.95
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 hafler ta 1600 ta1600 power amp amplifier US $2.25
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 New PYLE 3000 Watt Power DJ Pro Audio Amplifier AMP US $135.99
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 NEW Pyle 2200 Watt PRO Home DJ Power Amplifier Amp US $128.95
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 NICE COND CROWN XLS 402 STEREO POWER AMPLIFIER AMP LK US $289.00
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 Crest Audio 4001 Professional Power Amplifier Amp US $69.00
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 Crown DC 300A DC300a Power Amplifier Amp US $49.99
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 Crown CE2000 CE 2000 Power Pro Amplifier Amp Band DJ PA US $269.95
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 QSC 2 Ch Power Amp Amplifier RMX2450 RMX 2450 US $315.00
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 PEAVEY IPA 150T II INDUSTRIAL POWER AMPLIFIER PA AMP US $10.50
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 Crown XS700 Power Amp Amplifier Road Ready 2U Case US $400.00
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 BGW Systems 250C 250 C Professional Power Amplifier Amp US $49.99
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 BGW Systems 750C 750 C Professional Power Amplifier Amp US $49.99
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 Crown PS 400 PS400 Power Amplifier Amp US $49.99
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 Panasonic Ramsa WP 9440 WP9440 2 CH Power Amplifier Amp US $49.99
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 Used Crown D 60 Power Amplifier Amp D60 US $99.99
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 USED QSC EX 4000 power amplifier amp VGC NR US $583.00
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 Powered Mixer Mixing Karaoke Power Amp Amplifier US $158.00
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 New PylePRO 2000 Watt Rack Mount PA Amp Power Amplifier US $139.99
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 New 1400W PYLE PRO DJ Rack Mount Amp PA Power Amplifier US $119.99
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 New 4800 Watt 19 Pro Rack Mount PA Amp Power Amplifier US $188.88
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 Symetrix 420 Stereo 20 Watt Monitor Power Amp Amplifier US $59.99
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 NIB CROWN LPS 1500 STEREO POWER AMPLIFIER AMP LK US $329.00
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 QSC1400 Power Amp Amplifier US $169.99
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 Samson Servo 120 Stereo Power amplifier amp US $49.95
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 Crown Amp Ultratech 1010 CE1000 Power Amplifier US $100.00
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 New Pyramid 1500 Watt Rack Mount PA Amp Power Amplifier US $119.99
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 New 3000 Watt Pro Hybrid Pre Amp Stereo Power Amplifier US $199.99
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 New PylePRO 1400 Watt Rack Mount PA Amp Power Amplifier US $129.99
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 New PYLE 2 Channel Home Amp Mono Stereo Power Amplifier US $119.99
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 Behringer EP2500 Europower Power Amp Amplifier US $102.50
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 QSC HPR152I HPR 152I power amp amplifier module US $275.00
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 2 Crown XTi 4000 XTI4000 AMP Power Amplifier 100 240V US $1,229.00
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 QSC CX602V 2 CHANNEL POWER DJ AMP AMPLIFIER US $99.99
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 Crown XTi 1000 Stereo Power Amplifier Amp Presets US $113.61
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 CROWN AUDIO XTI 4000 PRO POWER AMP DJ AMPLIFIER XTI4000 US $634.00
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 CROWN CTS 8200 Pro Audio POWER AMP Amplifier CTS8200 US $26.00
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 Peavey CS1200 cs 1200 Stereo Power Amplifier Amp US $114.50
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Recall roundup for 6/9/2010
Look for the latest products recalled in the Recall Roundup every Wednesday in the Busi ness section.
Choosing The Right Audio Amplifier For Your Home
Choosing the perfect audio amplifier can be overwhelming given the large number of different types and technologies. Regardless of your application, I will explain some essential amplifiers terms which will be useful when picking the right model.
An audio amplifier will connect your audio source with your speakers by converting the fairly weak source signal into a strong enough signal to drive your speakers.
Even though some audio sources have already a built-in amplifier, a separate amplifier gives you more flexibility for picking the model that best complements your speakers. Some of today's mini amplifier models are small enough to hide them virtually anywhere.
When picking an amplifier, your first consideration probably is the amplifier output wattage. You will need a high wattage if you are driving speakers with a low sensitivity (expressed in dB/W), for driving speakers in large rooms or for outdoor speakers. You shouldn't use an amplifier with significantly higher output power than your speakers can handle. Overdriving your speakers can do irreparable damage to your speakers.
However, amplifier wattage is not everything. Good sound quality is probably more important than raw power. A 20 to 50 Watt amp should be sufficient for most real-world applications.
There are two conventions for specifying amplifier wattage. The first one specifies how much power the amplifier is able to deliver continuously. That number is often called rms or continuous power. The second number is called peak or maximum power and tells how much the amp can deliver for short bursts. You should choose an amplifier that has sufficient rms power, although 10 to 30 Watts should be plenty for most applications but has enough headroom for peaks that occur in music signals.
There are other parameters that are more important than wattage when selecting an amplifier. One important parameter is called total harmonic distortion or THD in short. No amplifier is absolutely perfect and the amplified signal will include some error components which will distort the signal to some degree. THD is either expressed in percent or dB. The amount of distortion varies between amplifier models. A smaller distortion means higher audio quality. Audiophile amplifiers will have distortion numbers of typically less than 0.05%. Consumer-grade amplifiers will have distortion figures of up to 10%.
Another figure related to audio quality is known as signal-to-noise ratio and describes the amount of unwanted noise the amplifier will add to the signal. Consumer-grade amps will have a signal-to-noise ratio (SNR) of at least 80 dB. Higher-end amps will have an SNR of 100 dB or more. Audiophile amps will have an SNR of close to 120 dB.
There are several amplifier technologies available. Today's amplifiers are mostly Class-D amplifiers. Class-D amplifiers have a high power efficiency and waste little energy as heat. Some of today's mini amplifiers are no larger than a deck of cards. However, when picking a Class-D (digital) amplifier, be sure that the amplifier has low distortion and a high signal-to-noise ratio.
About the Author
Gunter Fellbaum has been engineering audio and electronic products for over 10 years. You can find additional information regarding audio amplifier technologies and mini amplifier products at Amphony's website.
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