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Multi-Way Conventional loudspeakers with crossovers

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Old 8th February 2006, 06:12 AM   #31
rjb is offline rjb  New Zealand
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Yep, thats what I sketched with the box open. Nicely drawn, Dave.

The tweeter is right too.
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Old 8th February 2006, 08:01 AM   #32
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Nicely drawn


thanx...
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Old 20th February 2009, 06:39 AM   #33
jives11 is offline jives11  Europe
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Default Interesting thread

I picked up a pair of Leak 2020 speakers last year for free on a freecycle scheme. I'm very impressed with them, coupled with a small T-amp. These have a ceramic sandwich bass and a ceramic tweeter. The cabinets are chip board but the internal sides have thick damping material applied .

The crossover appears to be 3 air cored inductors and a single plastic cap.

The bass is exceptional, but the top end sounds pretty rough. Each tweeter is covered by a piece of cloth , so hard to see them. Any advice on improving the top end ? Maybe I should remove the cloth to check the drivers are not damaged ?
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Old 24th February 2009, 06:11 AM   #34
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Default Leak Sandwich

Hi!

I've got a pair but the woofer cones are rubbing in both. Some six years back, I tried turning the woofers by 180 degrees, but it did not help. Both are Alnico, magnet woofers and the screws holding the magnet to the frame look like they belong in an aircraft wing (to hold the jet engines on...). Anyway, HAS SOMEONE ever successfully readjusted the voicecoil position on such a powerful magnet assembly, without cutting out the dust cap and shoving plastic strips in there, who could help me through it?

Thanks,


-Steven
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Old 17th November 2010, 02:54 PM   #35
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Quote:
Originally Posted by slbender View Post
Hi!

I've got a pair but the woofer cones are rubbing in both. Some six years back, I tried turning the woofers by 180 degrees, but it did not help. Both are Alnico, magnet woofers and the screws holding the magnet to the frame look like they belong in an aircraft wing (to hold the jet engines on...). Anyway, HAS SOMEONE ever successfully readjusted the voicecoil position on such a powerful magnet assembly, without cutting out the dust cap and shoving plastic strips in there, who could help me through it?

Thanks,


-Steven
Long time ago but hey. Place woofer face down, undo four bolts till just free, taking care with vc wires. Move the magnet plate slightly, bounce the cone , when you hear no obvious rasping tighten nuts and refit. This way of centering normally proves adequate for all but the narrowest voice coil gaps.
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Old 17th November 2010, 11:49 PM   #36
CLS is offline CLS  Taiwan
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The frame (basket) looks like Whafedale.
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Old 8th February 2014, 01:11 AM   #37
ade99 is offline ade99  United Kingdom
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Thanks planet10 and rjb for the factual information here, which helped me repair a pair of 600s I acquired recently. They had been recapped with cheap single polar capacitors for computer/general applications and the values were miles out, this thread helped me pin down the exact values and ensure my crossovers were workable, so this thread was unique and indispensable.

I did listen to them briefly before I did any work and they didn't sound THAT bad!

May I suggest a couple of changes to planet10's schematic in the interests of accuracy. The midrange resistor is 29 ohms, not 290, and the tweeter needs to be shown with reversed polarity.

Now fixed, I quite like them. Not at all the bass monsters those big drivers suggest, bass is accurate and tight, if not lightweight. They excel at midrange, orchestral and jazz, wind instruments especially woodwind. The midrange speakers have fabric surrounds and open edges and seem a bit home made in their plywood square, but work a lot better than they look!

Al
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Old 8th February 2014, 01:36 AM   #38
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Quote:
Originally Posted by ade99 View Post
... and the tweeter needs to be shown with reversed polarity.
As drawn, tweeter is same polarity as woofer and reverse to the mid, are you saying it should be the sameas the mid and reverse the woofer? (the drawing is a little tricky)

dave
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