The only options I know are active monitors. Dutch and Dutch will get below 30hz in a small room are pretty flat from 100hz > 20khz forget about crossovers in these modern actives they're controlled by DSP. The Genelec 8351b will compete with the D&D , little wider dispersion great off axis, cartoid design, will sound about the same to about 30° just little less SPL. Another you might consider though I've never heard them are the larger Genelec 8361.