Tweeter for Magnapan MG1 Imp

rhr9 · 2nd August 2009, 03:59 PM

Hi Folks ,

At this time I' m trying to rebuild my old MG1 Imp .
Unfortunately the wires of the tweeter are broken at several places .
So I would like to know if I can replace it with a conventionnal
tweeter . Its caracteristics should be able to drive low frequencies : the initial crossover High pass was 1600 Hz at 6 db / Oct , a sensitivity of 87 dB and a high power admissibility .

Do you think that such a project makes sence ?
I need your advices .

Best regards ,
@ + Philippe.

Ed Holland · 3rd August 2009, 01:02 AM

Phillipe,

If you wish to restore the speakers, it is possible to replace the wire for the tweeter circuit with new. This is a little tricky, but possible without complex tools. Magnepan can provide repair kits containing the coated Aluminium wire and solder, and other materials such as adhesives you need are easily obtained.

I rebuilt a set of SMGa speakers last year (bass and treble circuits replaced), and the results were very good.

To substitute a different tweeter, you'd probably need to attenuate the signal, as the sensitivity of dome tweeters is often in the 90+dB/W/m range. Of course there are crossover considerations too...

Ed

rhr9 · 3rd August 2009, 03:47 PM

Hi Ed ,

Thank you for your reply .
I knew about the repair kit , but on MAGNENAN site there is no
email address to contact them .
Do you know how much it costs ? including shipping costs for Europe ?

However , I would like to make a try with a tweeter like the SEAS 27TBFC who's sensivity is about 91.5 dB that I can attenuate with resistors .

@ + Philippe.

kirk57 · 7th August 2009, 09:22 PM

Magnepan is not big on e-mail, but you can call them. They are in the Central time zone of the US.

The tweeter kit for the MGIIb that I ordered last spring was $50 plus shipping which was about $10 more. This includes the adhesive. You'd need to buy acetone to remove existing wire/adhesive.

I would think that using a different (i.e. non-planar) tweeter on these would pretty much destroy the sonic signature of the speaker. The low pass to the woofer is at 400Hz, and they are not known for their bass, so what's the point?

Just my $.02

Kirk

kirk57 · 7th August 2009, 09:26 PM

Forgot to mention that if you do decide to get the rewire kit from Magnepan, you need to do so before the weather gets cold. The adhesive included in the kit freezes and Magnepan is in Minnesota (cold up there) so they stop shipping the kits in late fall and resume in the spring. Magnepan can tell you specific dates.

Just something to consider....

kirk57 · 7th August 2009, 10:05 PM

Magnepan is not big on e-mail, but you can call them. They are in the Central time zone of the US.

The tweeter kit for the MGIIb that I ordered last spring was $50 plus shipping which was about $10 more. This includes the adhesive. You'd need to buy acetone to remove existing wire/adhesive.

I would think that using a different (i.e. non-planar) tweeter on these would pretty much destroy the sonic signature of the speaker. The low pass to the woofer is at 400Hz, and they are not known for their bass, so what's the point?

Just my $.02

Kirk

kirk57 · 8th August 2009, 02:13 AM

Magnepan is not big on e-mail, but you can call them. They are in the Central time zone of the US.

The tweeter kit for the MGIIb that I ordered last spring was $50 plus shipping which was about $10 more. This includes the adhesive. You'd need to buy acetone to remove existing wire/adhesive.

I would think that using a different (i.e. non-planar) tweeter on these would pretty much destroy the sonic signature of the speaker. The low pass to the woofer is at 400Hz, and they are not known for their bass, so what's the point?

Just my $.02

Kirk

2nd August 2009, 03:59 PM	#1
rhr9 diyAudio Member Join Date: Nov 2003 Location: Alsace	Tweeter for Magnapan MG1 Imp Hi Folks , At this time I' m trying to rebuild my old MG1 Imp . Unfortunately the wires of the tweeter are broken at several places . So I would like to know if I can replace it with a conventionnal tweeter . Its caracteristics should be able to drive low frequencies : the initial crossover High pass was 1600 Hz at 6 db / Oct , a sensitivity of 87 dB and a high power admissibility . Do you think that such a project makes sence ? I need your advices . Best regards , @ + Philippe.

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3rd August 2009, 01:02 AM	#2
Ed Holland diyAudio Member Join Date: Dec 2004 Location: Mountain View, California	Phillipe, If you wish to restore the speakers, it is possible to replace the wire for the tweeter circuit with new. This is a little tricky, but possible without complex tools. Magnepan can provide repair kits containing the coated Aluminium wire and solder, and other materials such as adhesives you need are easily obtained. I rebuilt a set of SMGa speakers last year (bass and treble circuits replaced), and the results were very good. To substitute a different tweeter, you'd probably need to attenuate the signal, as the sensitivity of dome tweeters is often in the 90+dB/W/m range. Of course there are crossover considerations too... Ed

3rd August 2009, 03:47 PM	#3
rhr9 diyAudio Member Join Date: Nov 2003 Location: Alsace	Hi Ed , Thank you for your reply . I knew about the repair kit , but on MAGNENAN site there is no email address to contact them . Do you know how much it costs ? including shipping costs for Europe ? However , I would like to make a try with a tweeter like the SEAS 27TBFC who's sensivity is about 91.5 dB that I can attenuate with resistors . @ + Philippe.

7th August 2009, 09:22 PM	#4
kirk57 diyAudio Member Join Date: Feb 2008	Magnepan is not big on e-mail, but you can call them. They are in the Central time zone of the US. The tweeter kit for the MGIIb that I ordered last spring was $50 plus shipping which was about $10 more. This includes the adhesive. You'd need to buy acetone to remove existing wire/adhesive. I would think that using a different (i.e. non-planar) tweeter on these would pretty much destroy the sonic signature of the speaker. The low pass to the woofer is at 400Hz, and they are not known for their bass, so what's the point? Just my $.02 Kirk

7th August 2009, 09:26 PM	#5
kirk57 diyAudio Member Join Date: Feb 2008	Forgot to mention that if you do decide to get the rewire kit from Magnepan, you need to do so before the weather gets cold. The adhesive included in the kit freezes and Magnepan is in Minnesota (cold up there) so they stop shipping the kits in late fall and resume in the spring. Magnepan can tell you specific dates. Just something to consider....

7th August 2009, 10:05 PM	#6
kirk57 diyAudio Member Join Date: Feb 2008	Magnepan is not big on e-mail, but you can call them. They are in the Central time zone of the US. The tweeter kit for the MGIIb that I ordered last spring was $50 plus shipping which was about $10 more. This includes the adhesive. You'd need to buy acetone to remove existing wire/adhesive. I would think that using a different (i.e. non-planar) tweeter on these would pretty much destroy the sonic signature of the speaker. The low pass to the woofer is at 400Hz, and they are not known for their bass, so what's the point? Just my $.02 Kirk

8th August 2009, 02:13 AM	#7
kirk57 diyAudio Member Join Date: Feb 2008	Magnepan is not big on e-mail, but you can call them. They are in the Central time zone of the US. The tweeter kit for the MGIIb that I ordered last spring was $50 plus shipping which was about $10 more. This includes the adhesive. You'd need to buy acetone to remove existing wire/adhesive. I would think that using a different (i.e. non-planar) tweeter on these would pretty much destroy the sonic signature of the speaker. The low pass to the woofer is at 400Hz, and they are not known for their bass, so what's the point? Just my $.02 Kirk