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Does a hf transceiver need to operate at a certain bandwidth in order for these plug and play eq's to work.

Does using a plug and play eq like the W2IHY equate too ESSB?

I watched a video someone posted of Bob Heil talking about plug and play eq's/outboard audio gear and needing a transceiver that operates in the 2.9 wide bandwidth in order to appreciate the lows.

Has anyone used a plug and play device with a transceiver that operates below 2.9 kHz bandwidth and what were the results? 73