Do Banana Plug Adaptors Degrade SQ?

Update to what I posted earlier.
I found the service data for the JBL L65 speaker. 

L65s do use a different speaker binding post arrangement then the 43xx/44xx series.  Original L65 binding posts are JBL part number 56130 (black), 56131 (red).

I can't tell for sure, but it looks as though the original binding posts are shorter and smaller diameter.  The threaded post looks hollow.  If that is the what you find, measure the internal diameter of the threaded post.

If you find it to be around 1/8" or 3mm, then you can use a "miniature" banana plug like the 2944.

https://www.pomonaelectronics.com/products/hardware/miniature-banana-plug-solderless

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.