Why do most SA have a lower limit at 9kHz?

When looking around at SAs, it seems that 9kHz is one of the standard lower bounds. Does something still drive this limit or just a standard practice from history?

[Justin Crooks]

It is partly due to the limitations of the DC blocking capacitor, and partly due to conducted emissions testing limits. Our SA44B does not have a DC blocking capacitor, and can go below 9 kHz.

• This reply was modified 4 years, 8 months ago by Justin Crooks.

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