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Old 28th September 2006, 03:40 PM   #1
nkg is offline nkg  Australia
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Default Fostex 206e Full Range

Just like to thank Martin King for his virtual 206e design which I have recently finished and do not understand why they are so maligned as they sound great and can recommend them to any beginner.
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Old 28th September 2006, 04:07 PM   #2
Vix is online now Vix  Yugoslavia
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Hi

What amplifier are you using?

What values for BSC?

Thanks,

Vix
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Old 28th September 2006, 06:05 PM   #3
Dumbass is offline Dumbass  British Antarctic Territory
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Quote:
Originally posted by nkg
do not understand why they are so maligned
I think there was a time when they were being hyped as the best thing since sliced bread, so people were buying them up and putting them in very poorly designed enclosures. Without the proper frequency compensation, the 206 will sound shrill in a simple vented cabinet.

I very much enjoy my pair of FE207E.
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Old 29th September 2006, 01:23 AM   #4
MJK is offline MJK  United States
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nkg,

Thanks for the positive feedback and public recognition. I agree with you that the FE-206E is a good choice for this type of design with a BSC circuit to rebalance the SPL response. People do get concerned about the loss of some efficiency and the design does fly against the accepted thinking on low Qts drivers, but the bottom line is it can work very well if you have a little extra power in the amplifier. I really like my low Qts Lowther drivers in the same size ML TL enclosure so I have no doubt the FE-206E will also yield excellent results. A friend of mine built a pair and the first time his wife heard one of her favorite singers performing her favorite songs he swore she had tears in her eyes.
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Old 29th September 2006, 10:36 AM   #5
Vix is online now Vix  Yugoslavia
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Hi ,

I have built these speakers (Project 5) with Fostex Fe206E. I have some mixed feelings about it. Love and hate at the same time.

There are some things be taken into account when building those ML TL with Fe 206 E.

If you have a low-powered tube amp, or a T-amp, this enclosure just won't do it. After a heavy BSC (which is a must), it will run out of steam too early. Ok, it will still be possible to enjoy some chillout music at a moderate volume, but forget about rock or Drum&base.

On the other hand, this speaker will sound quite good with high-power solid state amps. But it won't posses the midrange magic of tubes and will sound a bit harder and colder.

So, if you have a tube amp and Fostex FE206, don't build this enclosure. You will need a horn.

But, if you are comfortable with the sound of high-powered solid state amps (which I am not), this enclosure/speaker combination will sound better than some multi-way speakers, at a lower cost..

Best regards,

Vix
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Old 29th September 2006, 11:51 AM   #6
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That's my only concern with the 206 in a resonant cabinet. It will work superbly, but because of it's very low Q (lower than most Lowthers) it needs more resistive correction, requiring more grunt from the amplifier, unless, of course, you run digital Eq, in which case you're laughing. Martin's cabinet design is superb -I've build 3 pairs, and a wide baffle variation over the last 2 1/2 years and enjoyed every second I've spent listening to them.
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Old 29th September 2006, 12:51 PM   #7
MJK is offline MJK  United States
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I don't disagree with the comments concerning the low powered tube amp. When you buy into low powered tube amps, you are also placing a significant restriction on the type of drivers and enclosure designs you can consider. The tube amp and the speakers become a system that need to be matched carefully. Speaker efficiency and the amp running out of gas are primary concerns. This is much more difficult combination to get right.

With respect to T-amps, I used a pair of unmodified TEAC amps for a while and found the rated 8 watts sufficient for my Lowther ML TL enclosures. While I liked the midrange very much I found that the bass appeared to be rolled off somewhat by the amp, but power was not really an issue. I abandoned these and went back to SS amps.

The few negative comments I have recieved about my enclosure designs have primarily come from low powered tube amp users. Some of the tube amps just don't match up well with speakers that use a BSC filter.
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Old 29th September 2006, 12:55 PM   #8
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I use a pair FE206E from 150hz and up in my huge 2 way speakers (approx 5000l cabinet shared by all 4 drivers).

I used to drive them using a lm3886, which sounded pretty good (to me anyway).

Then I built a F1 and used the BSC describe by mr Pass. The difference was like night and day, the F1 really makes the FE206E sing.

If I hade to make a smaller system, I would go for a FE2006E in a horn and a F1 to drive them.
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Old 29th September 2006, 05:06 PM   #9
nkg is offline nkg  Australia
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Default Fostex 206e Full Range

Im running the speakers from a ss amp at the moment. I have a 30watt per channel el34 thats almost finished a 2A3 single ended thats 25% finished and some VT104's for a later project .Running out of puff is not a really a problem as I live in small flat in a block of 60 most of the people around me are 60 plus and I dont really play any rock & roll. I like the sound of both ss and valve amps both are good for different sorts of music.
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Old 30th September 2006, 12:35 AM   #10
ronc is offline ronc  United States
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I have never built MKs MLTL me being a horn nut. However i have run several sims on my programming and yes more watts avaliable is a must with the added BSC and damping of higher frequencies and loss of efficency.
On the 206. Its a good driver for the price, but without phase plugs and some mods to the driver i find it in its stock form unacceptable.
I had the 206 in my original Dallas design and have switched over to the 208 sigma and a ribbon tweet and found it to be a much easier combo to live with.
An Austin adapatation to the 206 would be a good application and would get very near to the MLTL performance in the LF response but would still be a more difficult build than the MLTL.
Conclusion: If you need more efficency with a lower powered amp with a low Qts driver then a properly designed BLH is necessary. The horn would provide a greater dynamic range, but would be a more difficult build.
All depends on the amount of involvement that you are willing ti accept for a given performance with a given amp.
ron
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