U47 M7 or K47 Capsule?

Jack Pettit · 7th March 2005

I think early U47's had M7's and later units had the K47's
What's the diff?
Is it a big deal, or are both good?

Thanks in advance for your time.

dale116dot7 · 7th March 2005

Technically, the differences are: the K47 uses a mylar diaphragm, the M7 uses a PVC diaphragm. The K47 clamps the diaphragm using a mounting ring and screws, whereas the M7 glues the diaphragm directly to the capsule backplate. This makes the M7 capsule itself slightly smaller than the K47. The K47 also mounts differently because of this difference. A clamped diaphragm does have some slightly different requirements on the backplate machining around the capsule rim when compared to a glued diaphragm, so the air volume behind the diaphragm may be slightly different when all is said and done. Also, the screwed mounting ring and larger backplate diameter (even though the active area is the same) does contribute to some colouration of the sound.

Sound? I have only used the K47, so I can't compare.

7th March 2005	#1
Jack Pettit Gear addict Joined: Jun 2003 Location: Reno Nevada Posts: 385 Thread Starter	U47 M7 or K47 Capsule? I think early U47's had M7's and later units had the K47's What's the diff? Is it a big deal, or are both good? Thanks in advance for your time. __________________ Jack P

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7th March 2005	#2
dale116dot7 Lives for gear Joined: Dec 2003 Location: Calgary, Alberta Posts: 816	Technically, the differences are: the K47 uses a mylar diaphragm, the M7 uses a PVC diaphragm. The K47 clamps the diaphragm using a mounting ring and screws, whereas the M7 glues the diaphragm directly to the capsule backplate. This makes the M7 capsule itself slightly smaller than the K47. The K47 also mounts differently because of this difference. A clamped diaphragm does have some slightly different requirements on the backplate machining around the capsule rim when compared to a glued diaphragm, so the air volume behind the diaphragm may be slightly different when all is said and done. Also, the screwed mounting ring and larger backplate diameter (even though the active area is the same) does contribute to some colouration of the sound. Sound? I have only used the K47, so I can't compare.