How do you think a magnet with the smallest coercive force can require the largest field and the most powerful installation for its magnetization?
Permanent Magnet Material................ Alnico Ferrite NdFeB SmCo5 Sm2Co17
Magnetic field level for saturation......... 0,5....... 1........ 3.......... 2,5...... 5-6
magnet, T
Технологическое оборудование для намагничивания, регулирования и размагничивания постоянных магнитов >> Конструкторское бюро электроаппаратуры
That's right, there are a huge number of great-sounding speakers made with a ferrite magnet and there are also a lot of bad speakers made from Alnico.
In your case, an electromagnet with a magnetic circuit from permendura might be even more profitable for marketing.
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The current discussion on magnets etc. is futile.
There are new FE103A. They are as is. We should respect the engineers (or marketeers).
Let's discuss how to use them. Boxes. Amplifiers.
1) in the proposed YK103A box (that of course does not have an acrylic side). It is bass reflex. I noted that in the calculus some think the parameters do not properly fit in a BR. The Qts is rather high, and that will be compounded again with a tube amplifier, rising to 6.2 or so.
2) in the TQWT/BR structure that Bert Doppenberg has designed (or at least is on his site). The question what to add on the back.
3) a horn like developed for the FE103E/Sol. Several designs. There are many designs here but the specs differ from the common FE103Sigma/Sol/En/... So what will be a good match.
a) a small solid-state amp like my Le Monstre (Design Jean Hiraga, with a rather low damping factor, excellent combination it was with the original FE103Sigma in the eighties)
b) a small tube amplifier like my 10Y single ended that I had also in the eighties and nineties, even lower damping, great 'field and stage, depth and apparent linearity')
c) 300B (would not expect so to be good, at least my experiences are mixed).
What about the 2.200Hz suck out band? Interesting a calculus gave me a result with a popup that the bass reflex tube had a 'resonance at 2.200 Hz". Go think.
There are new FE103A. They are as is. We should respect the engineers (or marketeers).
Let's discuss how to use them. Boxes. Amplifiers.
1) in the proposed YK103A box (that of course does not have an acrylic side). It is bass reflex. I noted that in the calculus some think the parameters do not properly fit in a BR. The Qts is rather high, and that will be compounded again with a tube amplifier, rising to 6.2 or so.
2) in the TQWT/BR structure that Bert Doppenberg has designed (or at least is on his site). The question what to add on the back.
3) a horn like developed for the FE103E/Sol. Several designs. There are many designs here but the specs differ from the common FE103Sigma/Sol/En/... So what will be a good match.
a) a small solid-state amp like my Le Monstre (Design Jean Hiraga, with a rather low damping factor, excellent combination it was with the original FE103Sigma in the eighties)
b) a small tube amplifier like my 10Y single ended that I had also in the eighties and nineties, even lower damping, great 'field and stage, depth and apparent linearity')
c) 300B (would not expect so to be good, at least my experiences are mixed).
What about the 2.200Hz suck out band? Interesting a calculus gave me a result with a popup that the bass reflex tube had a 'resonance at 2.200 Hz". Go think.
Let's not. 😉 They weren't intended for use / expected to be used, except in a handful of relatively extreme cases. The core market for a $700 pair of 103s units are collectors. Fair enough. From a functional perspective though, I'm not entirely convinced the time invested in detail design work would be worth the effort, given the extremely limited 'audience'. Happy to be proved wrong though.
While what you say is true, there are a whole lot of vintage FE103A that will, at least temorarilly have their value go up. I for example have at least 4 good ones.
1/ I don’t trust any reflex boxes Fostex does. The smaller FE103ish boxes somewhere between 3 and 5 litres.
2/ The BD ML-Voigt was the 1st FR speaker we made. Althou dating from before proper modelers the box does a decent job (you’ll really need 4 drivers).
3/ Aiko.The best box i have heard FE103A in. You need to tweak them to ensure the magnet does not impede the mounting of the driver to the baffle. Here with FE108e∑. The small reflex box is about the right size for a reflex for these.
Like the current FE drivers an amp with a little higher output impedance is best.
dave
There is much more to the speaker than the magnet. The whole suspension, gasket, basket and so on play a part.
In my understanding the speaker has been provided a little more breathing to improve the beating.
Linearity is important, to start moving with the tiniest signal.
It is something I am looking for.
I have with a lot of pleasure had the 103Sigma for over 10 years, happily hearing everything in a recording on the TQWT I made in 1982; the bottom was vivid and ample but a bit monotonous at times.
Still I like the smaller 103.
I am planning the BD (I can easily convert/close the still existing TQWT I have.) As second cq third unit in the box I can have a more traditional fe103E (@.4) or even a cheap clone (has the same Qts of .6). Certainly not another muy expensivo.
Alternatively a kind of horn? Many will say: Qts is too high, what about a 'helper' too with a low Qts) like Lowther sometimes does.
In my understanding the speaker has been provided a little more breathing to improve the beating.
Linearity is important, to start moving with the tiniest signal.
It is something I am looking for.
I have with a lot of pleasure had the 103Sigma for over 10 years, happily hearing everything in a recording on the TQWT I made in 1982; the bottom was vivid and ample but a bit monotonous at times.
- subsequently went to Quad ESL (other world, warm sound) for 20 years.
- Then tried Fostex again in TQWT (Voigt pipe) and man I heard those vocals again.
- And OB.
- now time aligned box, great harmonics but it only starts to give a unified soundstage above a certain volume/sound pressure, so less pleasure.
I am planning the BD (I can easily convert/close the still existing TQWT I have.) As second cq third unit in the box I can have a more traditional fe103E (@.4) or even a cheap clone (has the same Qts of .6). Certainly not another muy expensivo.
Alternatively a kind of horn? Many will say: Qts is too high, what about a 'helper' too with a low Qts) like Lowther sometimes does.
I am looking elsewhere now (such as the WE755 type diaphragma's) in reissued or really - copied components.
What I do not understand is that the FE103A has a large suckout band around 2 KHz. Just like the FE103NV. It must be the new spider or surround that catches that energy en gets it to disappear for ever.
View attachment 828471
What I do not understand is that the FE103A has a large suckout band around 2 KHz. Just like the FE103NV. It must be the new spider or surround that catches that energy en gets it to disappear for ever.
I do not understand that Fostex makes the new speaker more fit for bass reflex (them at Fostex must have intelligence that there is a big market for simple cabinets.)
albert
View attachment 828471
I have 2x Markaudio MAOP and the fostex 4 inch Alnico kill them under stress.
Spent 100 bucks for the fostex, 1000 for the Markaudio. Feel robbed...
Crossed at 280 Hz, 15inch mid bass, then cross to 2xsubs under 50hz. Crossed in digital domain, 16db linkwitx - rilrey including time phase correction.
2xFostex alnico OB per side. Open Baffles 5 foot x 1.5 foot in size, 60kgs each... Amplification Behringer pro +class t battery powered.
About to add 2xKEF 12 subs, as I love bass... 😁
Spent 100 bucks for the fostex, 1000 for the Markaudio. Feel robbed...
Crossed at 280 Hz, 15inch mid bass, then cross to 2xsubs under 50hz. Crossed in digital domain, 16db linkwitx - rilrey including time phase correction.
2xFostex alnico OB per side. Open Baffles 5 foot x 1.5 foot in size, 60kgs each... Amplification Behringer pro +class t battery powered.
About to add 2xKEF 12 subs, as I love bass... 😁