Which speakers should replace the Elac Uni-Fi B5?

As my old receiver died, I bought the Cambridge AXR100D receiver for its power-to-price ratio.

Unfortunately, it doesn’t drive my 4 Ohm Elac Uni-Fi B5 bookshelf speakers well, with audible crackles in a cinematic song that weren’t there before.

One of the options is looking out for is new speakers that are easier to drive. I’d love them to be:

What would you suggest?

As my old receiver died, I bought the Cambridge AXR100D receiver for its power-to-price ratio.

Unfortunately, it doesn’t drive my 4 Ohm Elac Uni-Fi B5 bookshelf speakers well, with audible crackles in a cinematic song that weren’t there before.

One of the options is looking out for is new speakers that are easier to drive. I’d love them to be:

What would you suggest?