I do not know Primare. My experience, though, is that this speaker is sensitive to electronics and cables. They are not shouty in the sense of some other horn models and do not have particular room placement quirks.
They do require a lot power. I have had a VAC phi 160, Hegel h160 and a Classe 70 hooked up to them. None could marry the woofer to horn.The ML 532H was a huge improvement in cohesion making the horn section relatively less prominent, even in comparison to the 150 watt Hegel. While the (tube) VAC is pretty sounding, it is not appropriate for the 4367.
It is great to try free or inexpensive experiments first. My guess is that they need new gear to know if they will work for you. May be safer to return to sell them, though.
They do require a lot power. I have had a VAC phi 160, Hegel h160 and a Classe 70 hooked up to them. None could marry the woofer to horn.The ML 532H was a huge improvement in cohesion making the horn section relatively less prominent, even in comparison to the 150 watt Hegel. While the (tube) VAC is pretty sounding, it is not appropriate for the 4367.
It is great to try free or inexpensive experiments first. My guess is that they need new gear to know if they will work for you. May be safer to return to sell them, though.