How do I connect my speaker cables to this Coda Amp

Just to clarify, the spade is too wide to fit in the plastic slot? 

Bananas.

Can you unscrew the nut/plastic and remove from the post? If so, see if you can separate the plastic coating from the brass nut.

I had this problem with my Coda #8, but I found that the large spades on my AZ cables fit if you perfectly aligned them with the slot. Anything but perfectly straight, they did not seem to fit. 

I couldn't figure out why I didn't recall having this issue.  My #8 is less than 2 years old.  It has really nice terminals, but no plastic covering like I see in the current photos of the amp.  I don't recall removing them.  

I changed the binding posts on my upper set to posts w/o the safety cover. Pop the top and get out your soldering iron and Bob's your uncle.

Otherwise you could try an adapter on the spade that is a banana as Erik suggests.

Dill is right, but so far I can't figure out how to get that plastic cover off the post.

I will take zlone's advice and try again with perfect alignment of the spades .

If I could get them to line up I know the nuts would screw down tight. 

In the mean time I have a call in to Doug Dale at Coda to see what he says.

I can't thank you all enough for responding. 

If this is like my Pass Labs XA25 amp that has Furutech binding posts with the clear cover, try the following.  If you are looking from the front over the rear of the amp, there is a slit at the top of the clear part that the spades slide into and then you tighten.  It took me quite a while to figure this out after I first bought a spade to banana converter thing from transparent cables.  See if yours is like that.  I would take a pic but everything is packed up for a move.  Good luck!

I just looked up your amp.  Those appear to be the same as the binding posts I have so it may be worth a try. I have the standard size spades on Nordost cables (Purple Flare)

WBT terminals that Coda uses are some of the best!

The plastic covers do not come off. 

The binding posts on my S5.5 came with the opening facing up. So I called Coda and Doug walked me through the process of reversing them to face down. It took 3 tries to get them on the phone as they were pretty busy at the time. But, when you catch him he is super helpful. Just keep calling until you catch him. 

I like the Furutech connectors on the XA-25...gotta get used to them but with proper size spades they're great.

Those sound like nice connectors.  My Pass has Furotech.  Spades easily went in from the bottom.  I changed mine due to weight of speaker cables.  Right angled or 45 degree angles.  I really like the Rhodium coated 45 degree.  You can tighten down a know which expands the banana.  You will not be able to pull them out once tightened.  They are Chines tho.  $6 each.  I have Pine Tree Audio speaker cables, so I just sent them back and they installed them.

I experienced similar issue but for Dali speakers terminals. The only thing helped me was the fact that speakers was equipped with massive gold plated jumper plates which actually helped to keep nice strong connection. Without those jumper plates the only way was to replace cables for one with banana plugs. 

I have the same terminals on my #8.  I’ve read if you twist hard enough the cover comes off but I haven’t tried and wouldn’t recommend it.  One option is to remove the spades and use bare wire or optionally re-terminate with bananas.  Let us know what Coda says.

I have the same connectors on my Electrocompaniet amp. As has been said you have to align the spades perfectly, and they will fit. I have large spades on my acoustic Zen cables. It was a pain, but I got them to fit. I use spades now-:)