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Multi-Way Conventional loudspeakers with crossovers

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Old 5th October 2017, 08:51 AM   #1
muzyk_ant is offline muzyk_ant  Romania
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Hi,
Can anyone have any ideea what make are these speaker cabinets ?
It was told to me that they came from USA but the filter capacitors are W. Germany made, also the mid and tweeter resemble some vintage German made as well. The front grill is aluminum and an interesting thing is that they used aluminum foil for the woofer coil in those filters. They are 3 way sealed/ compression loudspeakers so I guess finding a woofer for them is kind of difficult since almost all woofers now are made for bass reflex loudspeakers. The woofer seemed to be a 10". Unfortunately they came without the woofers.
Some help would be greately appreciated ! Please excuse my english

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Last edited by muzyk_ant; 5th October 2017 at 09:03 AM.
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Old 6th October 2017, 07:37 AM   #2
AllenB is offline AllenB  Australia
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It shouldn't be difficult to find a woofer that works, closed boxes are easy to work with. Find the volume of the box and use 3 specs for the woofer - Qts, Vas and fs.. to find the 2 box resonance properties - Qtc and fc.. and you'll begin to see a pattern. Then you can compare their sensitivity. Also consider how low in frequency the midrange plays when you choose the type of woofer.
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Old 6th October 2017, 08:09 AM   #3
muzyk_ant is offline muzyk_ant  Romania
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Thanks Allen! will do some calculations. At a first glance without considering all that you've mentioned I've found this drivers with qite high Qes but at least they could fit perfectly
WS 25 E - 8 Ohm
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Old 6th October 2017, 08:42 AM   #4
AllenB is offline AllenB  Australia
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Most people seem to want to end up with a Q of between 0.6 and 1.2, with many being around 0.7 The box is going to raise the Q of the woofer, so you could start with something possibly as low as 0.3 but maybe as high as 0.7

A high Q woofer could be made to sound good, but I'm not sure it isn't more a question of bass quantity for the cost.

What do you have there.. 40-50 litres? Probably not a bad choice with the Vas of this woofer but the Q will be quite high due to the small magnet.
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Old 6th October 2017, 09:53 AM   #5
Kay Pirinha is offline Kay Pirinha  Germany
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You have got a pair of WEGA lb 3521 speakers of indeed German origin. They were made in about 1971/72. All drivers came from German speaker manufacturer Heco. The woofer most probably was a TC244 (4 ohms) or TC248 (8 ohms). Unfortunately, publication of TSP's wasn't common in those days, but I've found a tiny little bit: http://wegavision.pytalhost.com/Heco...Bausatz/04.jpg which covers the tweeters and the squawkers as well.

I've got a pair of lb 3520's, lb 3521's (both 3-ways) and lb 3522's (4-way) each. Especially the latter (and biggest) one sounds amazingly, while the lb 3520's sadly sound as flat as they look.


Edit: Here are some more infos about your speakers: http://wega.pytalhost.com/1971/seite33.jpg. So you can see the xover frequencies.

Best regards!
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Last edited by Kay Pirinha; 6th October 2017 at 09:59 AM.
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Old 6th October 2017, 11:07 AM   #6
muzyk_ant is offline muzyk_ant  Romania
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The box is 29 liters and made some sims with bass box with this WS 25 E. It drops on a 50Hz - F3 with heavy dumping. Is this aceptable results, let's say on paper ? DO you you have in mind any other comercial woofer that I can run a sym on ? Thanks !
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Last edited by muzyk_ant; 6th October 2017 at 11:28 AM.
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Old 6th October 2017, 11:09 AM   #7
muzyk_ant is offline muzyk_ant  Romania
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Thank you Kay, very much apreciative of the help ! Very detailed indeed ! Hope I could find a suitable replacement wofers.
Regards !
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Old 6th October 2017, 05:27 PM   #8
Kay Pirinha is offline Kay Pirinha  Germany
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After having had a very close look at your pictures I got severe suspicion that your LP filter choke is missing in the Xover network. So I opened one of my lb 3521B's and found this choke underneath the PCB. I hope you'll find yours' also there?

Then I remembered that I've got the user's manuals in combination with the speakers when I acquired them in February 2016. So here are some more infos for you.

Btw, I have to stand corrected now: The woofer was called PCH 245 instead of TC 244. It's voice coil measures a DC resistance of 3.2 ohms, so it supposedly is a 4 ohms driver.

Best regards!
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Last edited by Kay Pirinha; 6th October 2017 at 05:29 PM.
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Old 6th October 2017, 06:36 PM   #9
muzyk_ant is offline muzyk_ant  Romania
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Hi Kay, thank you for opening the 3521 for me ! it seems that there is a slight difference from mine, your being a newer version? Talking about new (almost 50 years your's have the B after. Maybe are more refined and thinked on after making the first 3521 series.
btw the LP filter choke is there.
From what I see my mid's are PCH37 but thetweeter is PCH24/5 (yours HCL26/5) also the tw capacitor 6,8uF insted of 8,2 uF (yours). Unfortunately, for the moment I cannot measure the inductances. Other interesting thing is that in my filters they put some axial polarised caps instead of non-polarised but from what I see your filter where slightly "after market" modified with some non pols for the woofer section? Also mine has a more rudimentary point by point blank circuit board that I guess it was more cheap and fast to produce? I guess I can swap them for some good Polypropilene non polarised ones ?

So, my question remains, where could I find some suitable woofer substitutes for my pair of 3521? Will this woofer WS 25 E 4 OHM work in my speakers?

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Last edited by muzyk_ant; 6th October 2017 at 06:54 PM.
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Old 6th October 2017, 07:12 PM   #10
muzyk_ant is offline muzyk_ant  Romania
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oder diese : 1x Heco 1016610 Tieftoner - Bass aus Interior Lautsprecher #AA | eBay ? like new HECO ones
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