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supernet 15th June 2011 02:21 PM

LF55 & NAKSA70 and low impedance speaker load
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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..:p

I got also impedance curve of this speaker:

What do you think?

chlorofille 15th June 2011 02:46 PM

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.

AKSA 16th June 2011 12:20 AM


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.



andyr 22nd September 2011 03:07 AM

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.) :)



AKSA 17th January 2012 04:21 AM


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


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