charlielaub
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- Jan 5, 2023
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I'm waiting for a fully bridgeable PFFB implementation from these guys, which I'd like to use as monoblocks into some Wharfedale Lintons.
From my understanding of the product, the mono mode of the ZA3 is about as "fully bridgeable" as you can get from that chip... The TPA32xx chip has four independent onboard amplifiers. The "stereo" mode already has two pairs in "bridge" (BTL) mode. The "mono" mode then puts those in parallel - this doesn't significantly improve the 4 Ohm power rating but allows more power into 2 Ohms. It is a little odd that Fosi doesn't provide a 2Ohm mono power rating. Maybe there is not enough current on tap for 2 Ohm operation?
Edit:
I found this in the text on the Fosi audio web site page for the ZA3:
Dual-Mode Innovation: This new generation mini amplifier offers both stereo and mono modes, and adapts flexibly to your diverse needs, allowing seamless mode switching. In stereo mode, it delivers a robust output of up to 155W, while in mono mode, the power soars to a maximum of 235W. Pair two ZA3 units in mono configuration to create a powerful audio system, significantly enhancing your listening experience.