Help for MFB541 Tweeter replacement

Alles over onze geliefde MFB boxen in deze categorie.

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pserci
Berichten: 39
Lid geworden op: 02 aug 2016, 10:17

08 feb 2017, 12:58

HI all,
i own a pair of MFB541, and i would to upgrade original tweeter (ad0161/t8), with a modern tweeter.
I guess if someone of MFB enthusiasts have done so succesfully.
My question is, basically, would be sufficient adapt/project the passive filter at amp output, or this operation need a change of passive components on the electronic board? Or both?
What make/model of modern tweeters could be used?
Thanks in advance, regards

Paolo
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movieman
Berichten: 12532
Lid geworden op: 17 mar 2008, 22:42
Locatie: Zuid-Limburg

08 feb 2017, 13:37

Hi,

You should not do that. Leave the speakers in original condition.
pserci
Berichten: 39
Lid geworden op: 02 aug 2016, 10:17

08 feb 2017, 14:51

movieman schreef:Hi,

You should not do that. Leave the speakers in original condition.

Thanks for the reply...but i really miss something on these lovely speakers: medium frequencies. Human voices sounds so light and distant...i think that the original tweeter is the culprit
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movieman
Berichten: 12532
Lid geworden op: 17 mar 2008, 22:42
Locatie: Zuid-Limburg

08 feb 2017, 15:07

My guess is that they need service! After that they sound like new again. The midrange is definitely NOT a problem for these MFB's when the settings are correct and the electrical components are all ok.
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benoitmabille
Berichten: 3
Lid geworden op: 03 apr 2020, 18:31

16 mei 2020, 19:28

Hello,

I know this is a late reaction :shock: , however :
You are right the mid-bass is missing - my comparison is with Harbeth P3ESR (a quality bookshelf, english sound)

I replaced the tweeter AD0140 with the AD0163 (fabric dome, bigger magnet, softer tone)
- Changed some electronics for the more neutral AD0163, following instructions on the forum.
- Adapted the passive filter :
Woofer : 0.8mH serial, 18µF parallel, AD7066MFB4
Tweeter : 2.7 ohm serial, 8.2µF serial, 0.6µH parallel, 10 ohms parallel, AD0163T8

The mid bass is still light but acceptable, the sound is softer and still clear and dynamic :dance:
I also refreshed the electronics inside (capacitors, resistors, bypass...).

Have fun
Benoit
22AH762 MFB541 22GA222 CD150
pserci
Berichten: 39
Lid geworden op: 02 aug 2016, 10:17

17 mei 2020, 21:57

Hi Benoit,
yes it's late: 541 has gone and now I own a pair of 544 with AD0211 e AD0163, with all the last modifications as per Service Bulletin, plus others token from this precious forum. It's another sound, more complete and full.
:-)

Cheers
Paolo
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Fotohuis
Berichten: 6929
Lid geworden op: 19 feb 2016, 17:37
Locatie: R'stein soms Mykolaiv
Contacteer:

19 mei 2020, 23:26

Yes, the difference with a 541 and a 544 with the latest drivers 0211, 0163 and the necessary modifications is rather big.
But also the amp is more powerfull. Enjoy your 544 MFBs!
http://www.svema.info
Dynavox TPR-3 6N3P-EV voorversterker, ET-100+Teufel Ultima-20, Theater 500. N4504, N4511, N4450, N2521, (1)408, 212, 312, 222, draaitafels +GP401/412 Mk2 Sh./MC-3. CD204, CDF200. NAD C352, C422, C521BEE+FB820. 22RH743+22RH544/79R
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