FR125s frame/magnet damping

Foxx510 · 5th August 2007, 10:24 AM

If you tap the magnet cover of the FR125s driver, you will notice a fairly prominent resonance around 1.45kHz. Just after some opinions on whether it would be worth damping this, or is it a waste of time. It seems quite ringy to me.

Thanks for any advice
Adam

OzMikeH · 5th August 2007, 11:36 AM

It certainly won't hurt so just do it. Ductseal is a poplar putty to use. I couldn't get any so I used a few packets of poster putty. It's also a good idea to streamline where the magnet meets the basket, damp the basket legs and stick felt on the back of the magnet.

audio3000 · 5th August 2007, 12:44 PM

Do you mind sharing the improvement in your case.

Thanks.

OzMikeH · 6th August 2007, 02:02 AM

I don't have any measuring equipment. They seem more in control at very high volume but ears are easily fooled. Phase plugs made a much bigger difference (these are FE207E)

It can't hurt except for insulating the magnet, these are fairly efficient (95 dB/W/m) and in normal use don't see any more than 2 or 3 watts so the heat isn't worth worrying about. Reducing turbulence out the back of the driver and improving coupling between the magnet and the basket were my main aims. I gave them a real workout the other day testing an amplifier, they sounded pretty clean until they exceeded Xmax (1.5mm) on music with a high sub bass content.

If it worth doing? it took 15 minutes and cost $6 for the materials to do 2 speakers and I have plenty of sticky felt left over. Even if it does nothing it's cost me next to nothing.

5th August 2007, 10:24 AM	#1
Foxx510 diyAudio Member Join Date: Nov 2006	FR125s frame/magnet damping If you tap the magnet cover of the FR125s driver, you will notice a fairly prominent resonance around 1.45kHz. Just after some opinions on whether it would be worth damping this, or is it a waste of time. It seems quite ringy to me. Thanks for any advice Adam

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5th August 2007, 12:44 PM	#3
audio3000 diyAudio Member Join Date: Jun 2005 Location: Canada	Do you mind sharing the improvement in your case. Thanks.

6th August 2007, 02:02 AM	#4
OzMikeH diyAudio Member Join Date: Mar 2007	I don't have any measuring equipment. They seem more in control at very high volume but ears are easily fooled. Phase plugs made a much bigger difference (these are FE207E) It can't hurt except for insulating the magnet, these are fairly efficient (95 dB/W/m) and in normal use don't see any more than 2 or 3 watts so the heat isn't worth worrying about. Reducing turbulence out the back of the driver and improving coupling between the magnet and the basket were my main aims. I gave them a real workout the other day testing an amplifier, they sounded pretty clean until they exceeded Xmax (1.5mm) on music with a high sub bass content. If it worth doing? it took 15 minutes and cost $6 for the materials to do 2 speakers and I have plenty of sticky felt left over. Even if it does nothing it's cost me next to nothing.

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