turbobusa65 Posted December 23, 2006 Share Posted December 23, 2006 I have a marantz 2275 receiver and I am fixing to buy some RF 7's. will this old intergrated amp / receiver drive these? If not what would be a good solution? P.S. sorry i put this in the wrong! place Quote Link to comment Share on other sites More sharing options...
Guinness Posted December 23, 2006 Share Posted December 23, 2006 The Marantz 2275 is rated at 75 watts per channel, I think. That kind of power will certainly drive most any speaker, let alone the 102 dB efficient RF-7. Should sound great. I have a 2230 that sure sounds good with Cornwalls. Crank it up and enjoy. Quote Link to comment Share on other sites More sharing options...
Duke Spinner Posted December 23, 2006 Share Posted December 23, 2006 refer to your other thread everyone is missing the point ANY marantz is not gonna like 2 ohms..................... Quote Link to comment Share on other sites More sharing options...
Duke Spinner Posted December 23, 2006 Share Posted December 23, 2006 doesn't anyone know what S.O.A. mean's ..?? Quote Link to comment Share on other sites More sharing options...
turbobusa65 Posted December 23, 2006 Author Share Posted December 23, 2006 Yes sir, I heard ya! keep the volume down to a sane level, and make shure i,m not working the amp/reciever too hard. klipsch notes these are 8 ohm compatible, but I already had an idea that these monsters were going to give her a workout!!! There is a set of left and right pre out's on the back, not shure what I can do with those? need to do more homework! THANK'S MR. DUKE!! Quote Link to comment Share on other sites More sharing options...
Duke Spinner Posted December 24, 2006 Share Posted December 24, 2006 Loudspeaker Loads Where things rapidly get out of hand is with the loudspeaker load - it is not resistive (or even close to resistive) for 99% of all loudspeakers. ('cept ..Magnepan's )( Electrostatic ) The impedance and phase angle of a loudspeaker varies, and as phase angle changes from zero degrees (voltage vs. current), dissipation increases further. For the 3 Ohm case, a reactive load (at 45° phase angle) can be simulated by using a 477uH inductor in series with the 3 ohm load (for a frequency of 1kHz). With this combination, the Peak transistor Dissipation is 200W, with an Average of almost 42.5W - note that the Peak Transistor Power has DOUBLED, and the average has increased by 1.414. Of particular interest is that the maximum power occurs at the voltage zero crossing point, when the maximum voltage is across the device. This is what causes transistors to Fail, and the higher the voltage, the greater the risk. Quote Link to comment Share on other sites More sharing options...
Duke Spinner Posted December 24, 2006 Share Posted December 24, 2006 Hmmmmnnnnnn...... just how low does them RF7's drop...??? 2.8 ohms ...??? Quote Link to comment Share on other sites More sharing options...
Guinness Posted December 24, 2006 Share Posted December 24, 2006 doesn't anyone know what S.O.A. mean's ..?? What does it mean? What is it about Marantz that doesn't like a low impedance load, more than any other S.S. amp? Quote Link to comment Share on other sites More sharing options...
Duke Spinner Posted December 24, 2006 Share Posted December 24, 2006 Safe Operating Area it not just your Marantz... its All vintage equipment, ..... w/ TO based output devices Quote Link to comment Share on other sites More sharing options...
Duke Spinner Posted December 24, 2006 Share Posted December 24, 2006 Low Ohms + too much Drive = Smmmmmmoke ....!!! Quote Link to comment Share on other sites More sharing options...
mowntnbkr Posted December 24, 2006 Share Posted December 24, 2006 Please forgive my ignorance, but I thought RF-7's were 8 ohm speakers and isn't the only way to alter resistance is with some kind of variable resistor? Please educate me. The reason I ask is that I have an sx-1280 and Sansui G9000DB Quote Link to comment Share on other sites More sharing options...
turbobusa65 Posted December 24, 2006 Author Share Posted December 24, 2006 Careful I may start callin ya "Doctor duke" lol. Oooh! I thought the "S. O. A." meant that you had to run up to the amp, grab holt of the volume knob, and skin that sucker back. Then jump back away from it to the, "Safe Observation Area" so the, "Smmmmmmoke!!!" dont burn yo eyes! Sorry I could'nt help myself ! lol 'rolling" lol !! P.S. Thank's for the lesson !!! Quote Link to comment Share on other sites More sharing options...
JohnA Posted December 24, 2006 Share Posted December 24, 2006 Hey Duke, It's also about heat. If he controls the output voltage via the volume control it won't hurt a thing. Quote Link to comment Share on other sites More sharing options...
Duke Spinner Posted December 25, 2006 Share Posted December 25, 2006 Correct ..... Heat takes away any Safety Margin the transistor had in Dissapation ... but .. what makes ...Heat ..?? Low Ohms .......[] .................... you won't see a 4 ohm output on ANY vintage S/S amp...... all are 8 ohm Rated.....to keep current down Soooooooooo... enjoy the 2275 ......... but, don't crank'er Quote Link to comment Share on other sites More sharing options...
Duke Spinner Posted December 25, 2006 Share Posted December 25, 2006 RF-7's were 8 ohm speakers ...... Please educate me. The reason I ask is that I have an sx-1280 and Sansui G9000DB 7's are hard on lotsa amps ... 8 Ohm Rated...........but they drop as low as 2.8 ohms in operation, depending on frequency ... see the 3 Ohm example above, for what it does to Power Dissapation Lucky for you, both of them amps are probably coasting along at ear bleed levels Quote Link to comment Share on other sites More sharing options...
turbobusa65 Posted December 25, 2006 Author Share Posted December 25, 2006 Mr.Duke! This is exactly where I wanted this thread to go. So what are my options, taking into consideration I dont have a ton of money to drop on a whole new rig. "for example" could I add powered sub to help carry some of the load? Can this be done with my marantz? Any comments would be very appericiated. Quote Link to comment Share on other sites More sharing options...
Dale A B Posted December 25, 2006 Share Posted December 25, 2006 I'm thinking we're getting a little paranoid about blowing something up. If the receiver is in spec, you will be able to produce a massive amount of sound without any problems. I would not get a sub unless you need additional bottom end. Listen first, make decisions later, once you determine how much loudness you need (or can stand). My motto: crank and enjoy! NP - The Godz - The Godz (LP).............. .............................................................. Quote Link to comment Share on other sites More sharing options...
Duke Spinner Posted December 25, 2006 Share Posted December 25, 2006 no,no... you'll be fine.. just don't crank it, turn up the bass , etc .. itsa rugged amp.. but you can blow it up with them speak's Quote Link to comment Share on other sites More sharing options...
turbobusa65 Posted December 25, 2006 Author Share Posted December 25, 2006 Thank you all for the confirmed input everybody!!! Mr. duke thank you for all the technical information "WAY OVER my HEAD" though! lol And thanks for watching my back. The 2275 has killed two set's of speakers in the ten years I've had it. that's what caused me to buy these klipsch! I'll mind the volume, just gotta watch myself when I've had a few brewskis! Quote Link to comment Share on other sites More sharing options...
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