Input sensitivity

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25-Sep-2018 10:49 AM

TCSUK

TCSUK

Posts: 5

I've been reading lots on the forum ref which input sensitivity may be the best in different set up's.

I've sumed up that middle of the road seams to be the norm .775. Influencing factors that Im not sure are covered, is

1, weather bi amping would suggest a different value and would be better. eg 1.5 ?
2. that the fact I'm using a AV system as the pre amp (Anthem 700). may be better suited to a higher or lower level.?

Info
Just waiting for my kits to arrive :) I have 2 405's and 2 306's
My thoughts are 405 low end and 306 on the highs as suggested many times. That leaves me with a 405 centre and a 306 rears.
comments welcome
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25-Sep-2018 12:07 PM

EJP

EJP

Posts: 1537

The only thing that matters is that the preamp is matched to the power amplifier, so that the volume control has a useful range of rotation. Absolute numbers don't enter into it. Quad used 1.4V, 500mV, 375mV, and probably now 776mV, as between their own preamps and their own power amps. Bi-amping has nothing to do with it either, as long as the power amps have the same sensitivity. In your specific situation you should equalize both the 306 and 405 to the same sensitivity so as to match whatever your AV system puts out, or else attenuate one or the other output so as to ensure both power amps get the same effective level. There are no absolutes here.
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25-Sep-2018 01:40 PM

Stefaan

Stefaan

Posts: 583

I would suggest using 0,775V (0 dBm) - the actual standard - for all amplifiers.
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