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Old 15th June 2011, 01:21 PM   #1
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Default LF55 & NAKSA70 and low impedance speaker load

I am thinking of using Lifeforce 55 or new Naksa 70 to drive pair of 2.5 way loudpeakers with minimum impedance drop of 3 ohms. Since room is not so big, loudspeaker sensivity is also high (91db) and I like to listen to normal listening levels, so at least theoreticaly there should not be any issues with these two amps, but I would rather ask before doing any decisions..


I got also impedance curve of this speaker:


What do you think?
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Old 15th June 2011, 01:46 PM   #2
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The freq at 90Hz, combined with -46 deg phase, 5 ohm impedance will result in a fairly capacitive loading. Doesn't look so bad though. See here.
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Old 15th June 2011, 11:20 PM   #3
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Supernet,

For this load, where impedance is around 3-4R for the passband 200-800Hz, I would recommend two output pairs rather than one. For this reason I would suggest the NAKSA 100.

That would give you the reassurance needed to routinely run sub four ohm speakers.

cheers,

Hugh
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Old 22nd September 2011, 02:07 AM   #4
andyr is offline andyr  Australia
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But remember, Hugh - I have LF55 modules powering my 3.2 ohm Maggie mid panels. (They're basically all resistive, so it doesn't change much across its frequency band.)

Regards,

Andy
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Old 17th January 2012, 03:21 AM   #5
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Andy,

The OP's load is capacitive; yours are resistive. Phase shift makes a big difference.

Hugh
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