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Multi-Way Conventional loudspeakers with crossovers

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Old 7th February 2006, 11:59 AM   #21
bob_v5 is offline bob_v5  England
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mine is ceramic then. I agree about the tweets. Nice bass, a little gutless tho. The tweeters seem to be under powerd and dont go very high. Any one able to recomend replacements? Also a schematics of the XO would be nice.
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Old 7th February 2006, 05:51 PM   #22
rjb is offline rjb  New Zealand
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The sandwich mid/tweeter is not that bad. Just not up to the task of being both mid and tweeter.It matches the bass unit well in sound and if you use something else it may sound worse.

Although I would not use it in a new design, I would not change it for anything else in an original, just add a tweeter to make a true three way as Leak did.

I suspect the high eBay value is because some are now failing, being old, and owners want to keep their speakers original.

I will try to dig out the 3-way crossover later.
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Old 7th February 2006, 05:58 PM   #23
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Quote:
Originally posted by bob_v5
Also a schematics of the XO would be nice.
8 ohm version
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Old 7th February 2006, 05:59 PM   #24
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Sorry -- i didn't get choke values when i had these....
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Old 7th February 2006, 08:11 PM   #25
bob_v5 is offline bob_v5  England
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cool. what about using the standard tweeter as a mid and adding a proper tweeter too?
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Old 7th February 2006, 08:13 PM   #26
bob_v5 is offline bob_v5  England
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sorry didnt read ur post properly. any recomendations for an extra tweet?
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Old 8th February 2006, 12:38 AM   #27
rjb is offline rjb  New Zealand
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I opened up a model 600 three way, Sorry I cannot draw crossover like Dave but will describe. All values are taken off component markings
The drivers had the square ceramic magnets.


Compared to the 8 ohm version drawn by Dave,

Woofer- L=2.25 mH ferrite core
C= increased from 32 to to 50mfd

Mid - Now a two section filter,

-------][-----------XXXXX------
C1 ! L2 !
X !
X L1 = C2
X !
--------------!------------------!----------

First section is C1 L1 as before, C1 16mfd, L1 is 2mH, but bypassed by 290 ohm resistor.
Second section is a series L2, 1mH, with C2 6mfd, across mid.

Tweeter similar to first section of mid, C1 now 6mfd, L1 now 0.3 mH, but bypassed by 12 ohm resistor. Note tweeter is reverse connected.

All coils ferrite cored except 0.3mfd.

Tweeter unmarked except "made in England" on face plate, clear purple dome, possibly Elac?

Hope that makes sense.
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Old 8th February 2006, 12:41 AM   #28
rjb is offline rjb  New Zealand
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sorry- forgot to say series coil in woofer supply not bypassed. That is the 20R plus C combination is not installed.
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Old 8th February 2006, 01:41 AM   #29
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Quote:
Originally posted by rjb
Tweeter unmarked except "made in England" on face plate, clear purple dome, possibly Elac?
Clear purple dome is a give-away. Like the one pictured? AFAIK they are Wharfedale.

dave
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Old 8th February 2006, 01:46 AM   #30
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Quote:
Originally posted by rjb
crossover ... will describe.
As below?
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