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  #1  
Old 16th February 2008, 12:15 AM
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dan_s dan_s is offline
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Default 8 ohm op transformer with 4 ohm speaker

i just bought speakers with 4 ohm impedance (JMR trente) which i plan to drive with a kat6550 amp. the amp has dynaco mkII output transformers (A430) that have only 8 and 16 ohm taps. only the 8ohm wires are connected.
is there any potential damage to components in the amp when driving these speakers?

thanks
dan
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  #2  
Old 16th February 2008, 09:28 AM
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NealG NealG is offline
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Default Re: 8 ohm op transformer with 4 ohm speaker

No you wont damage anything. You'll have less power though and the o/p stage will produce more distortion, bass may sound a little wooly as well.
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  #3  
Old 16th February 2008, 09:58 AM
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Default Re: 8 ohm op transformer with 4 ohm speaker

Many thanks Neal!
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  #4  
Old 17th February 2008, 12:16 AM
kuroguy kuroguy is offline
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Default Re: 8 ohm op transformer with 4 ohm speaker

my 6aq5 amp had a nasty hiss with 8 ohm opt into 4 ohm speakers.
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  #5  
Old 17th February 2008, 12:30 AM
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Default Re: 8 ohm op transformer with 4 ohm speaker

Quote:
Originally Posted by kuroguy View Post
my 6aq5 amp had a nasty hiss with 8 ohm opt into 4 ohm speakers.
not something I remember getting when I tried 8 ohms into 4 ohm speakers,
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  #6  
Old 17th February 2008, 08:29 PM
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Default Re: 8 ohm op transformer with 4 ohm speaker

What about the zero transformers type of product that allows better matching? much too expensive but is the idea sound?
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  #7  
Old 22nd February 2008, 04:24 PM
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Default Re: 8 ohm op transformer with 4 ohm speaker

well, i hooked the amp to the speakers and didn't like the results. the speakers sounded wonderful when driven by a kat88 with original transformers. looking for new optputs now
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  #8  
Old 23rd February 2008, 09:13 AM
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dan_s dan_s is offline
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Default Re: 8 ohm op transformer with 4 ohm speaker

anyone using Lundahls? which model?
i wrote Per Lundahl, he didn't know which model and suggested i ask one of his distributors
sowters are a proven choice, as with Tony Moore and Richard's amps but are mightily expensive

Last edited by dan_s; 23rd February 2008 at 09:29 AM.
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