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-   -   LF55 & NAKSA70 and low impedance speaker load (http://www.diyaudio.com/forums/aksa/190887-lf55-naksa70-low-impedance-speaker-load.html)

supernet 15th June 2011 01:21 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 01:46 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 15th June 2011 11:20 PM

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

andyr 22nd September 2011 02:07 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.) :)

Regards,

Andy

AKSA 17th January 2012 03:21 AM

Andy,

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

Hugh


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