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Old 25th February 2004, 03:44 AM   #11
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Originally posted by then_dude
1) i want to build an woofer, i dont want cinema, i just want extreme fast, clear, transient bass respons, so i got to go for an sealed box i think. what do you think ? Which drivers i gotto buy: i need specifications, because i buy on ebay, so im depending on what they are offering. 2*8 inch of 1*12 inch ? the problem is, that i wanna make a speaker with on the botom the woofer,
the full range in open baffle and the supertweeter : just like the next picture
Exactly what i aspire to in my systems -- i call it a mostly full-range system. Pick a good full-range (i've got a collection of Foster FE103A i'm partial too.

Click the image to open in full size.

Then add a pair of powered woofers... to integrate well with the full-range they need to be quite extended on the top. I also like to have a pr of drivers push-push per side. I usually look for vintage 10s or 12s that were used as midbasses. You may give up some ultimate extension on the bottom, but with room gain an aweful lot of subs are actually peaky -- have too much low bass.

And a supertweeter above the FR where it rolls off -- a single cap can do the job. I find that the dispersion on a horn sometimes mates better with the top of the FR as it rolls off.

community sites t-linespeakers.org, frugal-horn.com, frugal-phile.com ........ commercial site planet10-HiFi
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Old 25th February 2004, 12:27 PM   #12
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hello planet 10

so you would use the fe103a for fullrange, i have thought about it because its small and thus less beaming, but has a good frequency response,

the bass is indeed a lot of times boomy, i have found on ebay 15 inch goodmans, allright 15 inch maybe boomy, but im gonna have some room treatment, (i think there fs is about 30hz, so not really very low.

the highs are indeed with a supertweeter,

as well for the highs and the lows, im gonna look for a driver with a natural fall off 6 db per octaaf.

but since i dont have the specs of greencone or philips im gonna measure them, and then look further

but im gonna order aslo some 103A if i ran into them, just for fun you know. (oh yeah, i have found coral 5II flat drivers in perfect condition, so maybe i'm gonna buy them instead of the fe103a)

thanx a lot already
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Old 25th February 2004, 01:37 PM   #13
Previously: Kuei Yang Wang
Join Date: Nov 2002
Default Re: rft drivers


Originally posted by then_dude

does somebody knows something about the RFT brand speakers
They cover a gamut from plainly crap to excellent. RFT was a large state owned concern in east germany, which acted as umbrella for at least 3 or 4 main speaker manufacturing Plants, which in turn often subcontracted to small private companies or cooperatives.

Originally posted by then_dude

i m looking for the specs of their drivers, for example the fullrange
RFT L 3401.
You will not find much in terms of T/S Data, the sensitivity of the L3401 was around 97-99db/W/m and it had a fairly high resonance 50-60Hz) and Qt (intended for open back PA boxes). Build was quite poor, compared to the higher quality stuff from either the west or eastern europe (such as the cast frame RFT's and the alnico magnet Lomo's from soviet russia).

Sonically the stock unit was inferior to older Eminece OEM units that where similar to the Beta 12LT but with lower powerhandling. So, think Beta 12LT.

Some of the better (cast frame) 12" Fullrange Drivers from RFT sound much better, also a number of small private companies and cooperatives specialised in modifying these cast frame 12" & 15" Units, often achieving surprising quality.

The L3401 however is pretty basic PA stuff and not that hot. If cheap buy them for all what it's worth. I suspect they will still sound nicer than many modern commercial supposedly "high fidelity" speakers with a suitable Amp.

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Old 25th February 2004, 01:42 PM   #14
Previously: Kuei Yang Wang
Join Date: Nov 2002

You can see a range of the more interesting RFT Drivers here:


The better (older) L3401 is called L3060, cast frame, Alnico Magnet....

Click the image to open in full size.

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Old 25th February 2004, 07:43 PM   #15
Rudolf is offline Rudolf  Germany
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Default @ then_dude

For more information on Sabas, RFT, Telefunken etc. have a look at www.audiotreff.de/

For posting there you need a registration, but you can look and search without. Go to "Selbstbau" and "Breitbaender" and use the "Suchen" link.
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Old 25th February 2004, 09:29 PM   #16
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thanx a lot, i'm reading already
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