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Multi-Way Conventional loudspeakers with crossovers

Classic monitor designs?
Classic monitor designs?
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Old 20th September 2017, 11:34 AM   #581
Ro808 is offline Ro808  Netherlands
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12 bucks in the US:

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Old 20th September 2017, 05:16 PM   #582
system7 is offline system7  United Kingdom
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Yes, that's the phenolic ring tweeter, isn't it? Phenolic because the brown surround is phenol plastic. I think Advent used to make woofers like this.

It's the weapon of choice for repairing AR speakers. IMO, cone tweeters work best with a third order filter, which is a step up from the old first orders most people used.

I messed around with my 8" speakers today:

Click the image to open in full size.

I had a 7.5R + 0.68uF Zobel on the SEAS metal tweeter, but I think it sounded too polite. It's better now. Very involving speaker and easy impedance. No nasty breakups at all. This circuit will work with almost ANY well-behaved 8" woofer IMO.
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Best Regards from Steve in Portsmouth, UK.
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Old 21st September 2017, 01:04 PM   #583
Ro808 is offline Ro808  Netherlands
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That's a decent curve Steve. I read some articles and threads on BW3 and people seem to have favourable experiences with it. However, one has to distinguish between electrical and acoustical slopes, and consider drivers' roll off. Sometimes, an asymmetrical XO works wonders.
On average, a passive BW3 means an increase in component costs.

Indeed, it's a no label phenolic ring tweeter as "drop in replacement" for vintage Marantz, Advent etc.

Last edited by Ro808; 21st September 2017 at 01:19 PM.
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Old 21st September 2017, 04:59 PM   #584
boswald is online now boswald  United States
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Classic monitor designs?
Those Advent woofers had masonite rings to adapt roughly 10" cones to 12" frames. Same colour as phenolic. HK's way to put a large motor with a smaller cone. Remember this is the same guy who had only those parts of the baffle painted that might show through the grill cloth. Not a speaker-porn guy, Henry Kloss.
By the way, those phenolic tweeters are a good match for many old speakers that actually had phenolic tweeters, though there is a large spike at the bottom of it's range which not all old crossovers are set up to deal with. Other than that spike(which the ARs had), however, it is not a replacement for an AR4x. I have here an AR4x tweeter which has come apart. I'll photograph an autopsy sometime, but it is an almost 3" cone, rather than the 3/4-1" cone in the phenolics. It's very weird. There is light cotton-like fuzz betwixt cone and backing plate,fiberglass in the dustcap, and some funny silicone-like gel(not sticky,but soft)on top of the pole piece. I am waiting for the second of a pair of 4xs and hopefully the other tweeter is intact, and can be tested.
I do remember(through the haze of two-score plus years) that the AR4xs sounded more balanced at very high levels than at moderate ones. Never blew up a tweeter, though. A good first speaker for many of us back then.

Last edited by boswald; 21st September 2017 at 05:25 PM.
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Old 21st September 2017, 06:32 PM   #585
chrisb is offline chrisb
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Yup -that little "fried egg" phenolic was seen in dozens of models of large mainstream and smaller local players in the 70-80s.
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Old 21st September 2017, 08:25 PM   #586
boswald is online now boswald  United States
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Classic monitor designs?
The 'fried egg' is more like a wide surround/small cone. Look at old Advents. Not the same as the phenolic ring jobs(which were common).
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Old 21st September 2017, 10:07 PM   #587
chrisb is offline chrisb
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The original Advent, and Winslow Burhoe's Energy 22 (dual hyperdome) tweeter were quite special indeed.
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