marems Posted September 20, 2018 Share Posted September 20, 2018 Hi Everybody! I’ve got some first generation RF-7’s and I am running them off a McIntosh MC 352. The question is, what is the normal impedance for the RF-7’s? Are they 6ohm or 4ohm? I have ran them off the 4ohm taps ever since i got them due to what I had read about the low impedance dips they pull. I just recently hooked them up to the 8ohm tap; and what I’ve found so far is the 8ohm tap gives a more in your face presentation with a slight sizzle sound to the highend compared to the 4ohm tap. The 8ohm tap also makes the Mac run slightly warmer to the touch..... 4 or 8 ohm tap? I would like to hear some observations from those who have run 1st gen RF-7’s off autoformer Mac amps. Thank you! Quote Link to comment Share on other sites More sharing options...
Deano1974 Posted September 20, 2018 Share Posted September 20, 2018 Hi there specs are as below and in photoNOMINAL IMPEDANCE 8 ohmsSent from my LG-H990 using Tapatalk Quote Link to comment Share on other sites More sharing options...
K5SS Posted September 20, 2018 Share Posted September 20, 2018 I have never owned the original RF-7’s but from what I have gathered from this site, I believe they can dip down to 2 ohms. I am sure the loyal and knowledgeable RF-7 crowd will be chiming in very quickly. Oh, nice setup! Quote Link to comment Share on other sites More sharing options...
carlthess40 Posted September 20, 2018 Share Posted September 20, 2018 On any amp that you would hook the RF7 up to you should alway set it the 8ohms. Like you stated you received much better detail with the sound. They are a 8ohm just for the spec sheet and yes as you okay them or any other the as the cone moves the ohms change. That’s just Physics Quote Link to comment Share on other sites More sharing options...
Zen Traveler Posted September 21, 2018 Share Posted September 21, 2018 The RF-7s reportedly had dips down to 2.8 Ohms a couple of times above what you normally would cross them over to a sub (i.e., above 100 Hz) but had a jagged Frequency Response Curve that made them "8 Ohm Compatible." IOW, because of their those lower impedance dips they couldn't be classified as actual 8 Ohm speakers but as long as you provide them enough current (which you are) then connecting them to your amp on the 8 Ohm setting should be fine. 1 Quote Link to comment Share on other sites More sharing options...
Deang Posted September 21, 2018 Share Posted September 21, 2018 Use the 8 ohm taps. Quote Link to comment Share on other sites More sharing options...
marems Posted September 23, 2018 Author Share Posted September 23, 2018 Thanks everyone for your input. I was told before that it ultimately boils down to personal preference for which tap to use. I do like to hear others experiences so thank you again everyone Quote Link to comment Share on other sites More sharing options...
pzannucci Posted September 23, 2018 Share Posted September 23, 2018 7 hours ago, marems said: Thanks everyone for your input. I was told before that it ultimately boils down to personal preference for which tap to use. I do like to hear others experiences so thank you again everyone Your evaluation makes sense. Use what you like. One tap will provide slightly smoother and tighter sound while the other will provide more of the lift you hear. Quote Link to comment Share on other sites More sharing options...
Deang Posted September 23, 2018 Share Posted September 23, 2018 It hits 3 ohms at 100Hz and 10kHz. The majority of the curve is 8 ohms or higher. Quote Link to comment Share on other sites More sharing options...
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