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The 444 is a DX frequency response, very narrow, rolls off the bottom end sharply. Great for noisy conditions, not so hot for pleasing mellow audio.

The 522 is a similar design physically, but has an entirely different element in it, it's a full range and very tight pattern noise cancelling element. It will give you much nicer, wider audio, but you have to use care to stay about 3" no more from the element and stay right on center or you will drop out quickly. Great for a noisy shack.

Not sure about the 450.

If you look them up on the Shure site, they have the manuals with the frequency response plots...it may not make much sense but if you compare the 444 with the 522 you may notice the different curves with the bottom dropped out of the 444.

[QUOTE="SR385, post: 137557, member: 3106"] The 444 is a DX frequency response, very narrow, rolls off the bottom end sharply. Great for noisy conditions, not so hot for pleasing mellow audio. The 522 is a similar design physically, but has an entirely different element in it, it's a full range and very tight pattern noise cancelling element. It will give you much nicer, wider audio, but you have to use care to stay about 3" no more from the element and stay right on center or you will drop out quickly. Great for a noisy shack. Not sure about the 450. If you look them up on the Shure site, they have the manuals with the frequency response plots...it may not make much sense but if you compare the 444 with the 522 you may notice the different curves with the bottom dropped out of the 444. [/QUOTE]

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