Fs lower, Qms a little higher, so seems a reasonable explanation since Qms is the mechanical Q of the speaker and only takes the speaker's mechanical properties into consideration.
GM
My understanding from Altec rep was the LF had a slightly heavier coil, which shifted it's bandwidth downward. I have never seen specific documentation.
Your neighbors called. They like your music.
Fs lower, Qms a little higher, so seems a reasonable explanation since Qms is the mechanical Q of the speaker and only takes the speaker's mechanical properties into consideration.
GM
Loud is Beautiful if it's Clean! As always though, the usual disclaimers apply to this post's contents.
On 421s: Altec 421 woofer
Last edited by mah; March 3rd, 2017 at 11:41 PM.
Opinion is only as valid as its verifiable supporting evidence.
The 421-8HII and 421-8LF were only ever made with the 16" frame AFAIK.
Agree. Dropbox - 1975 Altec Driver Reference
The 421-8LF was introduced in a 1978 catalogue - the 15 inch frame was in the past.
Opinion is only as valid as its verifiable supporting evidence.
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