Question about Bose Lifestyle SA-3 2-Channel Amplifier
Posted by Anonymous on
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Posted on Jan 02, 2017
SOURCE: Bose SA-3 Amp / Blown Fuse
The problem is not the transformer. You now have shorted output transistors at the very least. By corssing the wires you presented a zero(0) ohm impedence load to the output section. It quickly went into overload. Before the fuses had a chance to open up, the outputs fried. This unit will require new output transistors and perhaps the previous driver circuit will require parts as well. Figure on $20-$50 in parts plus hte local labor rate for the repair.
Posted on Oct 01, 2008
How many ohms is your sub? The SA 3 Amp can only handle speaker(s) 6 ohms and greater. A lot of subs, as I understand, are 2 and 4 ohms typically. If yours is 2 or 4 ohms, then that explains it. The speaker would be "straining" your amplifier and blowing it.
Posted on Apr 18, 2010
That would depend on the preamp. Name it. A true preamp outputs a variable signal.
It's not clear from the manual what the state of the volume output is without the VCA. Most amps default to full ON and the preamp attentuates the signal with a volume control. Try it with a signal that fades in slowly so you can intervene if it gets too loud. If it's full ON a preamp will control its volume.
Posted on May 29, 2010
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