Philips Inverted Cone Speakers

poynton · 25th July 2008, 07:24 PM

I have rec ently acquired a pair of these unusual speakers.

Are they worth anything?

or are they just curiosity value?

Andy

DcibeL · 25th July 2008, 08:33 PM

There were some car audio drivers that Solen used to sell that were "inside out" like that. I can't remember the name off the top of my head, but they looked quite good, a bit expensive IMO but I guess they're aimed at a specific application.

Steerpike · 25th July 2008, 09:26 PM

Those Philips ones like the AD1720 and AD3725 (just 2 model numbers i happen to know) were mainly for portable record players, so the speaker could fit into the lid, & still make the whole thing reaonably flat & portable. As such, not really hi fi, but still better than some twangy cheap stuff from out east.
The reverse magnet types usually lack an air gap dust seal, so are susceptible to dirt getting into the voice coil area.
Any Philips speaker driver with an "M" after the model number is a high performance (good flat response) model.

poynton · 25th July 2008, 09:32 PM

Hi.

They were from a 'portable' record player.

Both are AD3721 00 and are also marked 34 - 61 AH

Andy

Rolf Zetterberg · 26th July 2008, 08:37 AM

34-61 AH simply means that they were made in week 34 year 1961 in Aachen,Germany.

25th July 2008, 08:33 PM	#2
DcibeL diyAudio Member Join Date: May 2003 Location: Saskatchewan	There were some car audio drivers that Solen used to sell that were "inside out" like that. I can't remember the name off the top of my head, but they looked quite good, a bit expensive IMO but I guess they're aimed at a specific application. __________________ The power of Science compels you!

25th July 2008, 09:32 PM	#4
poynton Magneto the Gravity Man diyAudio Member Join Date: Mar 2005 Location: A life on the ocean waves when I'm not at home in N. Wales (but I'm not Welsh so no sheep jokes!)	Hi. They were from a 'portable' record player. Both are AD3721 00 and are also marked 34 - 61 AH Andy __________________ If it ain't broke, break it !! Then fix it again. It's called DIY !

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25th July 2008, 09:26 PM	#3
Steerpike diyAudio Member Join Date: Jan 2006 Location: Johannesburg, South Africa	Those Philips ones like the AD1720 and AD3725 (just 2 model numbers i happen to know) were mainly for portable record players, so the speaker could fit into the lid, & still make the whole thing reaonably flat & portable. As such, not really hi fi, but still better than some twangy cheap stuff from out east. The reverse magnet types usually lack an air gap dust seal, so are susceptible to dirt getting into the voice coil area. Any Philips speaker driver with an "M" after the model number is a high performance (good flat response) model.

26th July 2008, 08:37 AM	#5
Rolf Zetterberg diyAudio Member Join Date: Aug 2005	34-61 AH simply means that they were made in week 34 year 1961 in Aachen,Germany.

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