Do Banana Plug Adaptors Degrade SQ?

I’m using them on my setup running from a McIntosh MC2205 to a pair of large advents. Clear as a bell. 

This seems to be what you'd like, but I can't discover how it was achieved.

http://audioklassiks.de/wordpress/?p=2303

If you aren't comfortable soldering and opening equipment it might not be possible. Removing speakers to access the inside of a cabinet can be distressing and extreme care needs to be taken not to damage delicate cones, so I get you concern, particularly if slotted screws were used.

Having said that, it is entirely possible by encasing the screw head with your thumb and forefinger to keep the screwdriver in contact with the screw, and using a very long screwdriver, which helps keep it perfectly perpendicular. Just use as little force as is necessary to keep the screwdriver in contact with the screw and slowly rotate the screwdriver. Gently and slowly is the key, one screw at a time. If your muscles are up to it, consider taking a few goes for each screw, so there are no mishaps.

I have used the cheap banana to spade adapters from Amazon and I thought they were fine until I got a set of XOX Spade Adapters from Black Cat Cable.  
The XOX adapters not only worked better and had a better construction, they sounded essentially perfect as if there was no adapter attached.  I use them to this day and will until the day I depart this life.
Just my 2 Cents worth.

The JBL L65 looks like it has recessed binding posts on a 45° angle.

I have a pair of 4412As with likely the same arrangement.  It may be different in the case of the L65, but I doubt it.


JBL thoughtfully made the binding post spacing that matches a Pomona Electronics 1330 or 4892 dual banana plug.  That's what I've used for years.  Makes connecting your speaker cables a snap, even in the dark.


https://www.pomonaelectronics.com/products/banana-plugs-jacks-and-hardware/banana-plugs-and-jacks

And specifically the 1330:

https://www.pomonaelectronics.com/sites/default/files/d1330_100.pdf

The 4892 is the same as the 1330 except it has a wire strain relief molded in the grip.  If you want gold plated contacts, use the 4898:

https://www.pomonaelectronics.com/sites/default/files/d_MDP-4892-4898_102_7.pdf

The 1330/4892 series banana plugs are readily available from the usual suspects, Allied Electronics, Mouser, Digikey, Arrow, etc., etc.

I have the audioquest wel speaker wire and I have bananas.  I doubt they would have bananas on their top of the line if they sounded audibly worse.