[Fido2]

I know the 14B SST is a class A/B amp. At what wattage does the amp switch from pure class A to A/B. Thanks

[srb]

I know the 14B SST is a class A/B amp. At what wattage does the amp switch from pure class A to A/B.

For a 3B SST, ~ 1.5W and for a 4B SST, ~ 2.5W to 3W, per Chris Russell of Bryston.
http://www.audiocircle.com/index.php?topic=5750.msg50792#msg50792
 
For a 14B, ~ 6W, per Bryston Engineering.
http://www.audiocircle.com/index.php?topic=65491.msg605149#msg605149
 
Steve

[Fido2]

Thanks Steve

[rahman]

Just curious, assuming 90db efficient speakers and average SPL at listening position of 80db (and say peaks of 90db), would a 14b likely still be outputting in class A, or would some (or all) of the 6w of class a goodness be lost in the crossover (assume 3 way using 24db LR xover - ala PMC MB2)?

[tim92gts]

Just curious, assuming 90db efficient speakers and average SPL at listening position of 80db (and say peaks of 90db), would a 14b likely still be outputting in class A, or would some (or all) of the 6w of class a goodness be lost in the crossover (assume 3 way using 24db LR xover - ala PMC MB2)?

At 3m you'll need about 9 Watts so probably yes.

Increase headroom to 25 dB and you'll need 285 Watts.

Start partying at 90 dB and you'll need 2846 Watts.

To get that to the people at the back of the room 6 m away you''l need to up it to 11384 Watts
which although beyond the reach of the 14B as a continuous sine wave might just be acheivable as a transient
or soliton!