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<blockquote data-quote="quackhead" data-source="post: 7777783" data-attributes="member: 573547"><p>The Class A/B is an Analog/Bipolar amp, the Class D is Digital. A decent Class D is cheaper to build and can be made more efficient in terms of power/size ratio. A decent Class A/B is more efficient in terms of sound quality and flexibility, but usually less efficient in terms of cost to build. The Class A/B is prone to produce more heat if close attention is not paid to heat dissipation methods by the manufacturer.( the cheaper ones skimp out internal board layout and internal fans)..</p><p></p><p>This is a factory <strong>refurb</strong> Class A/B by one of the best in the business. It comes with a remote voltage meter to help ensure you keep power within it's recommended operating range of 13-14.5 volts. If you are willing to pay a little more attention to voltage fluctuations and can understand the included directions for use in bridged mono operation. This amp was $700 new, it is big and has no problem doing clean rated power down to 2 ohms. As long as you do the required electrical upgrades it would take for that HiFonics, SS, or Quart to operate without failure. Why did the SS fail??</p><p></p><p><img src="http://images.techronics.com/Alphasonik/TEC-350-APH-PMA2500A.jpg" alt="" class="fr-fic fr-dii fr-draggable " style="" /></p><p></p><p><a href="http://www.techronics.com/caraudio_3084_Alphasonik-PMA2500A-RB-2-Channel-Class-A-B-Bi-Polar-Power-Amplifier.html" target="_blank">Alphasonik PMA2500A-RB 2-Channel Class A/B Bi-Polar Power Amplifier</a></p><p></p><p>you cannot hardly find a used one for $200 bucks.</p><p></p><p>Features:</p><p></p><p>Alphasonik PMA2500A 2-Channel Class A/B Bi-Polar Power Amplifier</p><p></p><p>RMS Power Ratings:</p><p></p><p>500 Watts x 2 @ 4 ohms Stereo</p><p></p><p>800 Watts x 2 @ 2 ohms Stereo</p><p></p><p>1500 Watts x 1 @ 4 ohms Mono</p><p></p><p>Hour Meter</p><p></p><p>Remote Mount Digital Voltmeter Included</p><p></p><p>Heavy Duty One-piece Extruded Aluminum Heat Sink</p><p></p><p>Beveled Clear Acrylic Protective Cover</p><p></p><p>Tiffany-Style Input and Output RCA Jacks</p><p></p><p>Parallel Line-out RCA Jacks</p><p></p><p>MOSFET High Speed Switching Power Supply</p><p></p><p>Milspec Double-Sided Glass Epoxy Circuit Board with Through-hole Plating</p><p></p><p>Heavy 4 oz. Pure Copper PC Traces at All Preamp and Amplification Stages</p><p></p><p>Solid Brass Nickel-plated Terminal Blocks (4-gauge Power, 8-gauge Speaker)</p><p></p><p>Terminal Blocks are Compression Type and Soldered Directly to the PCB</p><p></p><p>Built-In Crossover:</p><p></p><p>Variable Low Pass Filter: 50Hz~250Hz, 24dB/Octave</p><p></p><p>Variable High Pass Filter: 50Hz~250Hz, 24dB/Octave</p><p></p><p>Variable Subsonic Filter: 20Hz~60Hz, 24dB/Octave</p><p></p><p>Variable Bass Boost at 45Hz: 0~+ 18dB</p><p></p><p>Variable Phase Shift: 0~180 Degrees</p><p></p><p>THD:<span style="color: darkgreen"> 0.05</span></p><p></p><p>Signal-to-Noise Ratio: &gt;<span style="color: darkgreen">100dB</span></p><p></p><p>Frequency Response: 5Hz~50kHz</p><p></p><p>Input Impedance:10K ohms</p><p></p><p>Input Sensitivity: 200mV~8V</p><p></p><p>4-Way Protection Circuitry: Thermal, Short Circuit, Overload and DC Offset</p><p></p><p>Optional PMA10B Remote Bass Boost Controller (not included)</p><p></p><p>Thermal Cooling Fan</p><p></p><p>Dimensions: <span style="color: red">21-1/4</span>" L x 8-1/4" W x 2-5/8" H</p></blockquote><p></p>
[QUOTE="quackhead, post: 7777783, member: 573547"] The Class A/B is an Analog/Bipolar amp, the Class D is Digital. A decent Class D is cheaper to build and can be made more efficient in terms of power/size ratio. A decent Class A/B is more efficient in terms of sound quality and flexibility, but usually less efficient in terms of cost to build. The Class A/B is prone to produce more heat if close attention is not paid to heat dissipation methods by the manufacturer.( the cheaper ones skimp out internal board layout and internal fans).. This is a factory [B]refurb[/B] Class A/B by one of the best in the business. It comes with a remote voltage meter to help ensure you keep power within it's recommended operating range of 13-14.5 volts. If you are willing to pay a little more attention to voltage fluctuations and can understand the included directions for use in bridged mono operation. This amp was $700 new, it is big and has no problem doing clean rated power down to 2 ohms. As long as you do the required electrical upgrades it would take for that HiFonics, SS, or Quart to operate without failure. Why did the SS fail?? [IMG]http://images.techronics.com/Alphasonik/TEC-350-APH-PMA2500A.jpg[/IMG] [URL="http://www.techronics.com/caraudio_3084_Alphasonik-PMA2500A-RB-2-Channel-Class-A-B-Bi-Polar-Power-Amplifier.html"]Alphasonik PMA2500A-RB 2-Channel Class A/B Bi-Polar Power Amplifier[/URL] you cannot hardly find a used one for $200 bucks. Features: Alphasonik PMA2500A 2-Channel Class A/B Bi-Polar Power Amplifier RMS Power Ratings: 500 Watts x 2 @ 4 ohms Stereo 800 Watts x 2 @ 2 ohms Stereo 1500 Watts x 1 @ 4 ohms Mono Hour Meter Remote Mount Digital Voltmeter Included Heavy Duty One-piece Extruded Aluminum Heat Sink Beveled Clear Acrylic Protective Cover Tiffany-Style Input and Output RCA Jacks Parallel Line-out RCA Jacks MOSFET High Speed Switching Power Supply Milspec Double-Sided Glass Epoxy Circuit Board with Through-hole Plating Heavy 4 oz. Pure Copper PC Traces at All Preamp and Amplification Stages Solid Brass Nickel-plated Terminal Blocks (4-gauge Power, 8-gauge Speaker) Terminal Blocks are Compression Type and Soldered Directly to the PCB Built-In Crossover: Variable Low Pass Filter: 50Hz~250Hz, 24dB/Octave Variable High Pass Filter: 50Hz~250Hz, 24dB/Octave Variable Subsonic Filter: 20Hz~60Hz, 24dB/Octave Variable Bass Boost at 45Hz: 0~+ 18dB Variable Phase Shift: 0~180 Degrees THD:[COLOR=darkgreen] 0.05[/COLOR] Signal-to-Noise Ratio: >[COLOR=darkgreen]100dB[/COLOR] Frequency Response: 5Hz~50kHz Input Impedance:10K ohms Input Sensitivity: 200mV~8V 4-Way Protection Circuitry: Thermal, Short Circuit, Overload and DC Offset Optional PMA10B Remote Bass Boost Controller (not included) Thermal Cooling Fan Dimensions: [COLOR=red]21-1/4[/COLOR]" L x 8-1/4" W x 2-5/8" H [/QUOTE]
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