Eliminating spade connectors, upgrading bits, soldering all of it in

Sharing, fwiw. Following a practice a local upgrade colleague did inside a Class A amplifier for me, I recently did the same type of thing on a pair of custom speakers I built for myself a few years back. The idea is around eliminating the last of any low grade connections I could find to see if I could upgrade the sound a little more.  Finally got some time to do it recently, and reporting first results and questions floating around in my head now. Wished I had gotten to this sooner, actually.   

Changes:

1. Removed a quad of quality gold plated spade connectors from speaker crossovers to rear speaker terminal (bi-wire binding posts) on the back of my main audio system speakers.   

2. Removed average run of the mill brass gold plated speaker terminals you can buy at Madisound or Solen. I always intended to replace these, and finally got to it. 

3. Added Cardas Copper binding posts, two pairs, for bi-wire configuration speaker connections to replace the prior pairs just removed. Sat in boxes a few years...

4. Soldered everything back together with Cardas solder thus elminating all prior quality gold spade connectors, internal speaker wire soldered directly. All spades eliminated. 

5. Also noting these new/better and more secure connections from my existing Cardas speaker cables to the new Cardas binding posts just installed

1st Listening Day:

Wishful thinking or not, I've been listening for a while, and something became immediately apparent now in question.  Woah, is it actually smoother on top and is the detail down into the upper midrange actually coming through with a little more and nicer "texture" now?  I could attest it seems like I can hear a little bit more "out there", too nah, really, hmmm. Really liking the added change with tone/texture. Puzzling.  

Setup - first testing with my Class A 50 watt solid state amplifier, and can say its already approching the smoothness of my tube amps in terms of tone, texture, and how it reveals details in a smooth way. The prior connections were good, nothing wrong, well crimped, I checked all of it before converting everything over. 

I really was NOT expecting this type of change, kinda scratching my head.  Its caused me to pause letting go of some of this gear too.

I'm not sure if anyone has encountered this kind of change with such [seemingly] small changes. Hmmm. Should have known better, my prior pair of speakers had everything all soldered in like this with no spades.  Maybe just a few weak links I had. Okay, just sharing in case anyone wants to comment or debate it at all. :)