I have the full spec at home, here are some for the start:
70 - Frame size 7"
850 - ceramic magnet nominal dia 45mm
M - Smooth response over a wide frequency range
8 - 8 ohms impedence
Freq response : 105Hz
Freq Range : 60 to 20K
Core dia : 14.5mm
Power Handling : 7W
Mounting Depth : 61.5mm
Originally posted by qwad dont waste your time with philips drivers there are better cheap drivers out there from taiwan that would run rings around any philips driver.... just my 0002cents worth cheers TC
to TOMTT; in answer to your question, an english twin cone [ the RICHARD ALLAN RA 8 ] nolonger made: from the 70's though they do come up on ebay from time to time approx 95 dB, very smooth with good bass..... hope this answers your question cheers TC
yea, dunno how much they are going for nowdays but any of the richard allan papercone drivers is worth investing in; as is their early, high end bextrene coned drvers and dome tweeters, also from the mid 70's, cheers tc
Originally posted by qwad
dont waste your time with philips drivers there are better cheap drivers out there from taiwan that would run rings around any philips driver.... just my 0002cents worth cheers TC
I do have some old fullrange units from Philips at home.
A 12" , the famous 9710m and a 51/2" driver (don't know the snr.)
I measured all of them and was REALLY surprised with the smal 51/2"fullrange unit. It performs up to 20khz with a nice freq. response and the decay diagram is superb (it's as good as the top models of todays leading fullrange manufacturers!).
You can't see any resonances at the decay diagram, a sign for a good membran! it's just plain old paper, but very stable.
Like someone said before, all of the units I have at home sound very open and clear. I haven't heard any other fullrange units sounding so natural. And like most 9710 owners, they swear by them.
Taiwanese drivers are cheap but not so good because they don't have the dynamic of old drivers or drivers like Fostex, Audio Nirvana, Moth Audio, Ciare (drivers not very expensive).
I love fullrange drivers and I have some. I prefer Fostex but I have try some old German drivers like Feho, DEW, Klangfilm,... etc . And they are very good and the sound is open, natural and alive.
I have a pair of FEHO 8" as good as models of todays fullrange manufacturers.
I have tested some Taiwanese drivers like Tang Band, they don't have the dynamic of old fullrange or todays fullrange like Fostex.
When you use a single ended of 211, 2A3 for exemple, the FE206E is a real natural cheap fullrange and philips, Feho, DEW could give you the same natural sound of a fullrange for less money.
Of course on Ebay, some prices become crazy. The price for a pair of Philips AD4200M in perfect condition must be 100 euros and not more, some Philips, Feho, DEW, Saba, Klangfilm 8" pair price must be between 30 and 75 euros and not more. When I see a Klangfilm 8" sell for the price of a FE208EZ I think it's stupid.
It's real that on ebay there is a lot of absurdity, like people who pay more for a second hand driver than the price for a new.
But even if people are often insane, we can find sometimes good fullranges for good prices
The problem with todays fullranges except some special manufacturers like Fostex, Audio Nirvana, Lowther,... is that they don't have enough efficiency and they are like all new drivers, flat and without life. A perfect flat curve for a driver give a driver without life.
yes it is all absolutely true, its just that l have a personal prejudice against anything phillips made, so l should have kept my slanted opinion to myself, my sincere apologies if l offended any of you............... cheers TC
hey all... i was reading into these posts about the dayton pt2 planar tweeter... i am currently building a big speaker that consists of 2 12" paper pioneer woofers and 2 pt2s. the crossover is 3rd order for both the woofers and the tweeters.
what i am trying to conquer here is to fix the total response of the tweeter, xover point is at 2k. bombardon73 has posted something to do with this... any suggestions anyone?