Recommendations for Original Advent Replacement Woofers Please

[Millstonemike]

Does anyone have experience with a drop-in modern woofer for the original Advents.

[billfitzmaurice]

You have to match up the T/S specs just as you would with any woofer. You may have to use a ten to get the Sd close.
dia - 12"
Sd 50 sq in.
Mmd - 27.1
Cms - .002409
Vas - 296.55 l
Fs - 18.9
Re - 4.48
Le - .10
Bl - 6.05
Qts - .413
Xmax - 2.9

[Millstonemike]

You have to match up the T/S specs just as you would with any woofer. You may have to use a ten to get the Sd close.
dia - 12"
Sd 50 sq in.
Mmd - 27.1
Cms - .002409
Vas - 296.55 l
Fs - 18.9
Re - 4.48
Le - .10
Bl - 6.05
Qts - .413
Xmax - 2.9

Bill, I've been away from speaker design for a few years. I was wondering if anyone had already done the "legwork" and found a decent solution.

[devnull]

You might try getting a hold of Huw at human speakers. Really knowledgeable about 70s & 80s speakers, he might be able rebuild them for you

[Chris Roemer]

Your only (relatively "easy") option is to get a "refoam kit" for them (you can find them specifically for the orig. "Large ADVE\T").
The "Q"ts range (in the 0.40-0.45 range) is not uncommon; the Fs range (20-25Hz) isn't either, but (as Bill said) those woofers use an oversize frame (given the cone area - in the 330 sq.cm. range) - Mr.K did that to get a lot of suspension travel. What's VERY uncommon (for a woofer this small) is the rather HUGE Vas values (around 6 to 7 cu.ft. for Qs near 0.45, and about 9-10 cf for Qs closer to 0.40). I don't believe anything like that is made today (unless you can find a Large Advent "replacement" woofer).

Plus, if you don't use the orig. woofer, you'll have to do XO work.

[Millstonemike]

Your only (relatively "easy") option is to get a "refoam kit" for them (you can find them specifically for the orig. "Large ADVE\T").
The "Q"ts range (in the 0.40-0.45 range) is not uncommon; the Fs range (20-25Hz) isn't either, but (as Bill said) those woofers use an oversize frame (given the cone area - in the 330 sq.cm. range) - Mr.K did that to get a lot of suspension travel. What's VERY uncommon (for a woofer this small) is the rather HUGE Vas values (around 6 to 7 cu.ft. for Qs near 0.45, and about 9-10 cf for Qs closer to 0.40). I don't believe anything like that is made today (unless you can find a Large Advent "replacement" woofer).

Plus, if you don't use the orig. woofer, you'll have to do XO work.

Thanks.

[Millstonemike]

You might try getting a hold of Huw at human speakers. Really knowledgeable about 70s & 80s speakers, he might be able rebuild them for you

Thanks.

[djg]

If you want to "nuke and pave", I believe there is at least one Econowave variant using the Advent cab.