New Guy

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Originally Posted by Old Guy

If the 421 is original would suggest using the 8H specs, Same cone but higher temp coil.

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Agreed, averaged measured specs of mine and another's pair from way back when, so probably off a bit from a more recent re-cone, especially if not done correctly with a factory kit:

GM [Greg M also on some forums]

Quote:

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Originally Posted by Greg_M

I think the Xmax is maybe off by a decimal place.
0.05" is a bit under 1/16"

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Not really, it's a MI driver designed to euphonically distort and no doubt at least one reason why you liked it so much for guitar picking.............. For HIFI/HT though, this makes it anything but an accurate reproducer unless set up to severely limit excursion. Ditto damping its alum dust cap to limit its beaming/shrill excess HF response.

Then again, IME, prosound musicians tend to prefer more 'colorful' [distorted] home systems, so may be the ideal driver for yours.

GM

Quote:

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Originally Posted by GM

Ditto damping its alum dust cap to limit its beaming/shrill excess HF response.
GM

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They make something called velvet in a spray can, I wonder how that would work for dampening the dust cap? (edit; I was thinking of using it on the insides of my piezo super tweeters.)

http://www.nwepaints.co.uk/acatalog/..._Aerosols.html

Don't know, but for sure not as easily removed as rubber cement. WRT piezo damping, I use modeling clay.

GM

Count me as anti-recommending the velvet.

I install 4 inch felt domes over my 421's 3 inch aluminum ones. Slight added mass also will lower FS just a hair which is beneficial.

Brad puts a vented paper dome on his to accomplish the same thing. Idea is to kill the overtones from the dome.