K3: Need 6kHz filter for wide AM BC reception?

[KM5Q]

To receive AM shortwave broadcast (at bandwidths wider than 2.7), do I  
NEED the 6 kHz roofing filter?

The price list seems to say I only need it to transmit AM (which I  
don't intend), but it isn't completely clear. The manual doesn't  
mention it.

Thanks
Windy KM5Q
K3 due in April
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[Julian, G4ILO]

Windy Dankoff KM5Q wrote

To receive AM shortwave broadcast (at bandwidths wider than 2.7), do I  
NEED the 6 kHz roofing filter?

The price list seems to say I only need it to transmit AM (which I  
don't intend), but it isn't completely clear. The manual doesn't  
mention it.

You don't NEED it. You can listen to AM in SSB mode by zero beating the carrier. Some people claim it even sounds better. Even with the AM filter in "proper" AM mode you'll only get 3KHz audio bandwidth, because the 6KHz covers both sidebands. The main benefit is you won't hear the whistles as you tune through the carriers.