开云体育

I crossposted this to a Kenwood Facebook group but need to cast a wider net for answers. I recently got a Kenwood SP-31 speaker (off eBay) to match with my nice TS-870. I plugged it in and the speaker itself seems fine. I downloaded the manual and read it, then started experimenting with the built in audio filters. But I can hear no evidence that they work, at all. This is disappointing and disturbing but before I ask the seller for a refund, wanted to see if someone here has experience and guidance.

I push the three buttons in all the various possible combinations, but there is essentially no change in the audio. I found _three_ different CW signals close to each other, spread in tone from quite low to medium to high, and tried the filters. No change that I could tell, none were attenuated in the least. Same with SSB, no change in tone or noise or attentuation of nearby signals.

Is this thing broken, or is there something else I need to know, my expectations somewhere off reality? Can it be repaired or improved?

Thanks,
Charlie, WB4FAW