What Harbeth did you listen to? The only 3 way Harbeth is the model 40 and that is over 16 grand. Where did you get the information that a 3 way speaker has less distortion? This Vandersteen might fit the bill!
https://www.vandersteen.com/products/model-2ce-signature-ii
https://www.vandersteen.com/products/model-2ce-signature-ii