rumble Posted May 12, 2007 Share Posted May 12, 2007 hi i have a yamaha m-50 power amp and just got a pair of ads L710s which are rated at 6 oms nominal / 4 ohms minimum and i'm afraid i'll clip the amp and blow the speakers if this amp doesn't have a 4 ohm speaker rating. ican't find any specs for the amp anywhere on the internet, and the onlything printed on the back of the amp is for 8 ohm speaker outs. other m-series yamaha amps seem to have 4 ohm ratings, so i was wondering if this were true for the m-50 i have. thanks in advance. rb Quote Link to comment Share on other sites More sharing options...
JohnA Posted May 12, 2007 Share Posted May 12, 2007 A 4 ohm rating is irrelevant to clipping and possible tweeterdamage. You will clip the amp by driving it too hard. Infact, driving an amp into a load below its capability will damage theamp long before the speakers because the amp cannot cool itself whiledelivering the extra current a low impedance load requires. Ihave an M-70. The M-70 is rated at 50 watts min. into 8 ohms, 60watts min. into 6 ohms. It is rated at 70/85/110 watts dynamicpower into 8/6/4 ohms. Quote Link to comment Share on other sites More sharing options...
johnyholiday Posted May 12, 2007 Share Posted May 12, 2007 http://www.yamaha.co.jp/manual/english/index.php............enter a "M" in search field ,all the others are there.....but sure enough no m-50 Quote Link to comment Share on other sites More sharing options...
rumble Posted May 13, 2007 Author Share Posted May 13, 2007 http://www.yamaha.co.jp/manual/english/index.php............enter a "M" in search field ,all the others are there.....but sure enough no m-50 yep.. been there... pretty odd... Quote Link to comment Share on other sites More sharing options...
rumble Posted May 13, 2007 Author Share Posted May 13, 2007 http://www.yamaha.co.jp/manual/english/result.phpm 40 specs:8 ohms - 120w6 ohms - 145w4 ohms - 170walso has an auto class a switch. when off it functions as class a/b ampm 45 specs:8 ohms - 125w6 ohms - 150w4 ohms - 180walso has an auto class a switch when off it functions as class a/b amp--------------------M 50: (my amp)does not have an auto class a switch.no specs listed at yamaha's site for the m 50.(because this whole universe is against me) <>all it says over speaker terminals is 8-16 ohms.is this a yamaha "black sheep"?--------------------m 60 specs:8 ohms - 160w6 ohms - 185w4 ohms - 210walso has auto class a switch. when off it functions as class a/b ampalso has ohm load selector switches to adjust meters for 2, 4, or 8 ohm loads Quote Link to comment Share on other sites More sharing options...
JchrisA Posted June 28, 2007 Share Posted June 28, 2007 I use a m-50 to drive paradigm 3se speakers (6 ohm rated, 89db efficiency) without any problems. However I don't think yamaha intended theamp to be used with 4 ohm rated speakers as there is only a A or B speakers switch . A+B would be 4 ohms when driving 2 sets of 8 ohm speakers in parallel. Also the impedance of a speaker varies throughout the frequency range. This amp is probably even more current limited than the m-40 or m-45 since yamaha did'nt give a power rating for 4 ohms. If your speakers have to low of an impedance, hopefully the amp will go into protection. The m amps are a great deal though. Quote Link to comment Share on other sites More sharing options...
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