BA70TE To be honest, the original MP filters are sufficient. The filter with a bandwidth of 1.2K loses almost all of the mid and high-frequency components when listening to speech, and I don't understand what the purpose of such an SSB bandwidth is. If you absolutely must buy one, the 300Hz filter is the best option, but if you're not a hardcore competitor or using multiple microphones in a large broadcast setting, the original MP's 600Hz roofing filters are more than enough.
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