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Ronnie wrote:

"would it mean that your use the same type SS receiver for MF channels as well?"<BR><BR>-Da! I'll do better.

I did not realize that you drive all your horns with those cheap SS receiver. You absolutely must not do it. Just do not use horns if you use those receivers and you will get much better sound. It is not the encourage you to go for better amplification. However you were gullible enough to make the horns and now you violated the basic rules of physics trying to use those horns.

If you are wiling to drive your horns with SS then do not ever think about class B amplification, and for MF horn it is even more devastating then for bass horns. In class B both shoulders are completely off. When the open up there us a time delay and low-level non-linearities that lead to severe distortion. This distortion is worsening with output level going down and ay small signals the Class B amp are frightening. My air-conditioner sounds better then Class B plying “small signals”. Do not forget that with 109dB sensitivity… whatever you do, you are in the domain of ultra low signals, particulary with you HF channels…

The Class A/B is not a lot better if it biased to switch to B class at low power. The switching distortions, the crossover distortions, the distortions because the SS devises operate outside of their maximum linearity regions,  some bogus noises and harmonic components and many other problems in A/B makes them unusable with horns.

So, get rid those receivers immediately or if you must use them that bias them as high as possible, as long their design and heat dissipation allows them. You should have at least 5W of pure A1 out your receiver to be able to drive your horns. You still will not get a good sound but you will be further from the absolute misery

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