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Multi-Way Conventional loudspeakers with crossovers

Large Advent clone
Large Advent clone
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Old 14th July 2020, 01:08 AM   #1
90 days is offline 90 days  United States
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Default Large Advent clone

I am in the process of building a pair of Large Advent (clone) speakers, after I build the cabinets I will select the crossovers and drivers. Any help anyone can give would be great!
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Old 14th July 2020, 01:17 AM   #2
Cal Weldon is offline Cal Weldon  Canada
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Large Advent clone
Hi excellent idea. They are still one of the oldie goldies.
First you start with the drivers, then you copy the box and thirdly you copy the xo unless you are able to design an updated version. Lot's of info on where to get the stuff but if you really want a set of large Advents, you might just want to buy a set. You can't just clone them. Unless by clone you just mean build a 10" 2 way speaker?
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Old 14th July 2020, 01:32 AM   #3
90 days is offline 90 days  United States
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Yes, by clone I mean the same cabinet measurements, and 2 way, with 10" woofers.
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Old 14th July 2020, 01:55 AM   #4
Cal Weldon is offline Cal Weldon  Canada
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Large Advent clone
Well, there are some so called drop in replacement woofers. Might be a place to start.

Advent Factory 10" Large Advent, New Large Advent, The Advent, OEM Woofer P001-31858: Amazon.ca: Electronics

Problem is, we have learned much about loudspeakers since those days. For example a 10" woofer is difficult to carry high enough to xo to a cone tweeter. Sure it worked back then, to a point, but with what we know now, we want a smaller woofer for a 2 way and by the time you get to 10" you may as well be thinking 3 way.

My large Advent cabinets came with the tweeters but no woofers. They just kinda sat around getting dusty until one of the very generous members here set me up with refoamed woofers. The xo's were easy to recap and low and behold, they had a new life.
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Old 14th July 2020, 02:01 AM   #5
drewmc is offline drewmc  United States
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You can't make a true clone. Manufacturers no longer make "acoustic suspension" woofers with highly compliant spiders and surrounds. This makes it impossible to achieve the low Fs in a smallish sealed box. You would need to apply a Linkwitz transform equalization.
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Old 14th July 2020, 02:04 AM   #6
drewmc is offline drewmc  United States
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The advent "Fried egg" tweeter actually was a mid/tweeter. The modern equivalent would be a woofer assisted fullrange driver system. A good 2" or 3" would do the trick.
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Old 14th July 2020, 02:17 AM   #7
stratus46 is offline stratus46  United States
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Quote:
Originally Posted by drewmc View Post
You can't make a true clone. Manufacturers no longer make "acoustic suspension" woofers with highly compliant spiders and surrounds. This makes it impossible to achieve the low Fs in a smallish sealed box. You would need to apply a Linkwitz transform equalization.
I can give 1 hint. The free air resonance of an Advent woofer is 15 Hz. In the box, the system resonance goes up
to 38 Hz. Voice coil wound on a copper form appears to be 1/4" exposed on each edge. Would that make xmax
12mm?

I have re-foamed 6 or 8 of them and it is not difficult at all. I removed the masonite rings (old style), cleaned
them off and glued them back to the frame with RTV. The glue from foam to cone is good with pure latex - never
hardens.

G
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Old 14th July 2020, 04:53 AM   #8
AllenB is offline AllenB  Australia
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Large Advent clone
To me this depends on whether you have heard these, and like what you hear. If you have then it should be possible to show you how to recapture some of that using currently available parts.
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Old 14th July 2020, 05:52 AM   #9
LineSource is offline LineSource  United States
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There are several articles discussing convering the Large Advent cabinet into an EconoWave design with a 12" SEOS waveguide and a 1" compression driver. Good reviews on sound quality.

The 10" woofer SB29NRX75-6 models to -F3 = 43Hz in a sealed 1.5cuft volume.

New Large Advents: 14" w x 11 1/2" d x 26" h
about 1.5cuft usable internal cabinet volume.
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Old 14th July 2020, 02:15 PM   #10
boswald is offline boswald  United States
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Large Advent clone
The Humanspeakers 10" Epicure-style woofer has similar specs and roll-off behavior to the Advent metal-framed woofer.
The Peerless 1.5" wide range drivers(TC5) would work, the neo may be sensitive enough. The TC6 range are more sensitive and easier to work with.


This will of course not be a clone, but a retro-styled copy(which definition allows improvements in crossover design, allowing for baffle diffraction effects and modern placement).
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