Hello dear audio friends,
who here has an idea how big the relevant membrane area SD in qcm/square inch is exactly on a vintage Philips AD 9710 M 01. I can measure or calculate a circle area myself, that is kindergarten. 8 inch fullrangespeakers are usually around the 220 sqcm SD – if a multiple is needed it does not help to estimate, the error is then bigger. There must be somewhere reliable facts about the SD on the AD 9710 M 01!?
Already best thanks for your infos!
Kind regards Gerd
who here has an idea how big the relevant membrane area SD in qcm/square inch is exactly on a vintage Philips AD 9710 M 01. I can measure or calculate a circle area myself, that is kindergarten. 8 inch fullrangespeakers are usually around the 220 sqcm SD – if a multiple is needed it does not help to estimate, the error is then bigger. There must be somewhere reliable facts about the SD on the AD 9710 M 01!?
Already best thanks for your infos!
Kind regards Gerd
This speaker was first introduced long before TS param where around, some 70years ago. Despite of that, some TS param can be found if you search this site, or google, but no SD, sorry
If you know the exact frame diameter, then scale the inner, outer limits of its surround and find its mean to get an effective diameter under load.
The 9710 is a 8.5". I have measured the T/S parameters on several 9710 with ceramic magnets. I have to dig out those values but as I remember Fr is about 50 Hz Qt about 0.6 and Vas 80 L. Nice drivers as long as you listen far off axis!
At the end he shows a measured improvement with the 98¢ whizzer tweak.
i think i have a set of the 10’ ceramic version.
dave
i think i have a set of the 10’ ceramic version.
dave
Dear DIY members,
Thank you very much for your active participation! What should I say - a house loses nothing. I found it in an old Hobby Hifi from 08/09 2015 by Bernd Timmermanns, the specification the SD of the Philips 9710 Mo 01 is 246 sqcm = 38, 13 square inch. So hardly a difference to that of the PHY 21 LB 15 by Bernard Salabert.
Love regards to the DIY audio world
Gerd
Thank you very much for your active participation! What should I say - a house loses nothing. I found it in an old Hobby Hifi from 08/09 2015 by Bernd Timmermanns, the specification the SD of the Philips 9710 Mo 01 is 246 sqcm = 38, 13 square inch. So hardly a difference to that of the PHY 21 LB 15 by Bernard Salabert.
Love regards to the DIY audio world
Gerd
I did my measurements in 2012 with WT3.
Estimated diameter 170mm (227cm2) SPL at 1W 95dB
With the concentric rings of an accordion suspension, I have the impression that the number of rings engaged in motion changes with the amplitude of motion of the cone
Re= 5.2 Ohm
Fs= 51.1 Hz
Qts= 0.62
Qes=0.78
Qms=3.0
L(e) =0.73mH
Mms=6.0g
Vas=118 dm3
This with ceramic magnet version of the 9710. They were in prodction for many years
Estimated diameter 170mm (227cm2) SPL at 1W 95dB
With the concentric rings of an accordion suspension, I have the impression that the number of rings engaged in motion changes with the amplitude of motion of the cone
Re= 5.2 Ohm
Fs= 51.1 Hz
Qts= 0.62
Qes=0.78
Qms=3.0
L(e) =0.73mH
Mms=6.0g
Vas=118 dm3
This with ceramic magnet version of the 9710. They were in prodction for many years
@classAfreak
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