Hi Rick,
Cambridge speakers are decent for the money, but they don't have the neutrality that Axiom speakers exhibit overall. Keep in mind that when you mix different brands, there will always be some tonal mismatching, but it's usually less critical in the surround channels. You'll likely notice it but accommodate the timbral inconsistencies for a while, because the multi-channel home theater is such a seductive experience, we set aside our critical faculties. Eventually, you may become really dissatisfied with the timbral mismatching, and want to improve things.
Regards,
