FiiO 4.4mm Balanced Amp AM3B Impressions - Expatinjapan

The AM3B 4.4mm balanced/3.5mm single-ended output amplifier module is based on the AM3A,but has received key enhancements over it. Like the AM3A, which has proven to be a hit among audio enthusiasts, the AM3B also uses the highly-acclaimed AD8620 wide-bandwidth precision JFET operational amplifier in conjunction with two tailor-made OPA926 op-amps.

However, from here the differences begin. Exterior-wise, due to the extra length of the 4.4mm socket we could not use traditional layout techniques as this would result in the jack undesirably protruding from the rest of the amp module. In order to resolve this issue, FiiO engineers came up with some clever packaging involving two stacked PCBs that not only ensures we can fit a 4.4mm socket within our amp module, but also allows for further protection of the audio circuit contained in the module itself. In addition, a metal ring surrounding the 4.4mm jack also adds further strength to the connection.

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Author: Damon; From: Head Pie

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