usmcsoldriver Posted July 11, 2010 Share Posted July 11, 2010 I just picked up a B&K 200.2 today. $475 cash. I havnt had much time to listen to it, but what little i have been able to. All I can say is, WoW. Everything has just opened up. Everything is clearer, more dynamic. To everyone that doesnt have an amp. A seperate Amp is a MUST! Quote Link to comment Share on other sites More sharing options...
willland Posted July 11, 2010 Share Posted July 11, 2010 Usmcsoldriver, Congratulations on your amp purchase. You should/will be pleased with your B&K for a long time. Rock solid build quality with a neutral/warmness that you would have to spend a ton more elsewhere to duplicate. Great price. Bill Quote Link to comment Share on other sites More sharing options...
Boxx Posted July 11, 2010 Share Posted July 11, 2010 You did well I hope you enjoy it... Quote Link to comment Share on other sites More sharing options...
usmcsoldriver Posted July 11, 2010 Author Share Posted July 11, 2010 i failed to mention the speakers! Just to give the total picture. RF-7's. Running through a Yamaha RX-V665. I listend alittle more this morning, very pleased. Quote Link to comment Share on other sites More sharing options...
willland Posted July 11, 2010 Share Posted July 11, 2010 i failed to mention the speakers! Just to give the total picture. RF-7's. Reference 200.2 Power Rating @ 8 ? 225 W Power Rating @ 4 ? 375 W Number of Channels 2 Current (Peak to Peak) 75 Dynamic Head Room 1.2 dB Total Harmonic Distortion (THD) 0.09% Signal to Noise (S/N) 95dB Input Impedance 33.2 kΩ Damping Factor (50Hz) 450 Frequency Response 5 Hz to 45 kHz Slew Rate 14 V / µsec Input Sensitivity (RCA)Unbalanced 1.4 V Input Sensitivity (XLR)Balanced 2.8 V Gain 28.3AV or 28dB AC Line Voltage 120/220/240VDC Level Controls No Binding Post Maximum Wire Gauge 4 AWG Balanced Inputs Yes Control Input 5 - 24 VDC Control Output 10 - 12VDC 200mA Dimensions in Inches (Cutout Dimensions)(Width/Height/Depth) 17 (17 1/8) W5 13/16 (5 15/16) H15 3/4 (16 1/2) D Shipping Weight 42 lbs. Max Power Consumption 875 Watts Max Current Draw 9 Amps With these specs, you will have no trouble feeding your RF-7's with plenty of current(75 amps peak to peak). Bill Click image(s) for larger viewBrochure Quote Link to comment Share on other sites More sharing options...
usmcsoldriver Posted July 12, 2010 Author Share Posted July 12, 2010 1. I wish i understood what 75 Amps peak to peak means. I've been doing alot of reading, but that isnt making sense. Any help? 2. Will there be an issue if I always leave it on? Quote Link to comment Share on other sites More sharing options...
willland Posted July 12, 2010 Share Posted July 12, 2010 1. I wish i understood what 75 Amps peak to peak means. I've been doing alot of reading, but that isnt making sense. Any help? I am not an electrical or electronic engineer but I do know that a high current amp has a much easier time driving low impedence speakers, and handling the peaks and demands of music and HT. This may explain better explain things. B & K Components, Ltd. 2100 Old Union Road • Buffalo, New York 14227 • 716-656-0026 • Fax: 716-656-1291 email: info@bkcomp.com www.bkcomp.com July 30, 2004 Question: “What is a ‘high-current’ amplifier and why is it better?” A “high-current” amplifier is capable of delivering power into low impedance loads (speakers) without going into protection and/or shutting down. Ideally, an amplifier’s output power would double every time the load presented at its output is halved. For example, an “ideal” amplifier rated 250 Watts @ 8 Ohms would deliver 500 Watts @ 4 Ohms, noting that the load has halved and the power has doubled. In actuality, a “real-world” high-current amplifier capable of 250 Watts @ 8 Ohms might be delivering about 425 Watts @ 4 Ohms. An easy way to identify a “high-current” amplifier for use with home consumer electronics is to look at what happens to the power rating as the impedance of its load (speakers) drops. The closer the amplifier comes to approaching the “ideal” amplifier scenario, the more current the amplifier is capable of delivering and the better the sound reproduced by the speaker. In a typical amplifier-speaker circuit, voltage and current are delivered to a very complex load consisting of speaker drivers, resistors, inductors, and capacitors. Voltage may be thought of as the potential to do work, and current as what actually flows to do the work. Although basic power may be calculated by the simple multiplication of voltage and current, it is the delivery of the power from the amplifier to the complex speaker load that accounts for why two amplifiers may have the same power rating into identical impedances (speaker loads), but still be significantly different from one another in sound quality. Some of these sound quality differences may include perceived loudness, depth, and clarity. Amplifiers that are designed to operate with high voltage as opposed to high current are typically much better suited to high impedance loads, typically 8 Ohms and higher. Lower current rated amplifiers have been said to sound dynamically limited and “harsh” at high listening levels. High quality “audiophile” speakers can have nominal impedances from 8 – 2 Ohms, and during very dynamic passages in source material can easily dip below 2 Ohms. These super low impedance drops can easily choke a high voltage amplifier with limited power storage capacity. For a high-voltage amplifier, this will likely cause problems and trigger its protection, not to mention the less than nice sound it may produce. A high-current amplifier operates with much less effort and typically does not have any problem with these types of speakers. B & K amplifiers employ a high-current design with large amounts of capacitive power storage. Modern B & K amplifiers can handle nominal impedance of 4 Ohms, as well as dips below 1 Ohm while remaining stable, loud and clear with deep bass and good three-dimensionality. A good example of a “real-world” situation being very close to an “ideal” situation would be our Reference 200.1 mono amplifier. Rated 250 Watts @ 8 Ohms with 150 peak-peak Amps of current, it is quite the powerhouse. When used with a 4 Ohm load the Reference 200.1 kicks out a cool 425 Watts! That’s about as close to perfect as one could expect. So, what’s the bottom line? For use with lower impedance speakers, high-current amplifiers sound louder, cleaner, and provide more depth than their high-voltage counterparts. High-current amplifiers will not shut down when the speaker presents a difficult load due to varying dynamics in source material. 2. Will there be an issue if I always leave it on? I think the only drawback to leaving your amp on is that it will draw current and waste energy. Watch out for the green police. Bill Quote Link to comment Share on other sites More sharing options...
usmcsoldriver Posted July 12, 2010 Author Share Posted July 12, 2010 I read that part of the website a few times before reading it. I guess I didnt make the connection between the Amp being a High current Amp and the 75A Peak to Peak. Goes to show that I simply dont know as much as i wish or should. Quote Link to comment Share on other sites More sharing options...
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