[Terry Burns]

Hi Scott,

I think that speaker connection on your Hk is for a permanent magnet speaker. The one in your radio is an electrodynamic speaker. The field coil located on the back of your speaker is an intregal part of your radio power supply. It is used to to smooth out the rectified dc voltage. It works in conjuction with your filter caps. I think I would use my original speaker to constantly monitor the sound quality and to make sure the voltages when measured for test purposes are correct. I always use the original speaker when trouble shooting a radio.
Maybe Chuck S. or someone else could explain it better.

Hope this helps
Terry