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Old 17th January 2006, 11:28 AM   #21
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Default Re: European prices for FE206ES-R fixed

Quote:
Originally posted by validator
FE206ES-R data sheet

FE206ES-R recommended horn enclosure
[/B]

I must say that (out of my memory) the measurements looks very similar to the Nagaoka D-57. The same height, width and throat area. Even the CC seems to be about the same volume.

(I'm currently trying out the D-57 with the FE-206E right now. I'll get back about those when I know more)

/Peter
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Old 17th January 2006, 10:23 PM   #22
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Horn-lovers should go into raptures over this driver. For those wanting to try something else; here's an ML TQWT. Actually, it's my old standby, Martin King's Project 2 ML TQWT, which yet again works wonders with only a small modification to the vent sizes.

60" tall
10" deep
2.5" wide at top
14.5" wide at bottom
Driver 30" from top
4" x 2" (WxD) port 3" up from the base.
0.25lbs ft^3 stuffing.
4 ohms series resistance applied. (all measurements are internal)

If you want another 10Hz or so of bass, increase the cabinet depth to 14" and the width at the base to 16.5". OK, this sacrifices efficiency for a nominally flat anechoic response and pretty deep bass, but it's still over 90db efficient which means 5w should take your head off.

Cheers
Scott
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Old 18th January 2006, 04:47 AM   #23
sapdog is offline sapdog  Canada
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Default dithering

Hi - thinking seriously about placing an order

I am currently running an FE207e in Martins virtual design - actually have an image posted in his gallery -"stephen small"- and although I would expect to ultimately build a BLH for these drivers - would they work at all in that standard cabinet?

bye the way - I do really like the FE207's - but the baffle step correction circuit had really done a lot - so with my Dynaco ST-35 amp clone at 12+ watts I don't mind losing some efficiency.

Steve in N.Van - aka sapdog
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Old 18th January 2006, 07:46 AM   #24
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Quote:
Originally posted by Scottmoose
MathCad predicted response of the FE206ES-R in the recommended back horn, without stuffing applied. This is approximate as these Fostex Factory horns are really a series of......[snip]

Hi Scott,

Comparing 206-ESR to the 206E.

It would be very intresting to see what difference the driver would make in the recommended horn.

You seem to be quick and nimble with Martins WS, so may I please ask if you could do the simulation that you did with the ESR and the Fostex recommended horn for the ESR, but with the std 206E instead of the ESR.

Regards

Peter
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Old 18th January 2006, 09:32 AM   #25
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It shall be done. Give me a few minutes.
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Old 18th January 2006, 10:17 AM   #26
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FE206E in FE206ES-R enclosure:
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Old 18th January 2006, 10:24 AM   #27
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FE207E in FE206ES-R enclosure. As you can see, not actually a great deal of difference between any of the three Fostex drivers in this horn -the frequency response is almost identical. However, the response curve is not everything: that gigantic magnet on the ES-R (BTW: am I the only one a bit diappointed that it doesn't seem to share the fancy materials the FE166ES-R magnet had? Lathanum-cobalt wasn't it? Probably no difference whatsoever, but good for the old feel-good factor!) should provide more detail.

I also had a quick look at the FE207E in the standard FE206E horn (which incidentally, I think is apallingly ugly). The results were so vile I'm not even going to bother posting them. I haven't tried modelling any of these drivers in the FE208ESigma backhorn though, which is even more handsome than the FE206ES-R horn in my oppinion, though it might not couple to the floor quite as well. That said, these should allow a bit of creativity -FE206ES-R double back-horn anyone?

These should be fairly accurate, though they don't take the room into account, or the level of stuffing that you apply to the compression chamber: they assume raw, unstuffed enclosures, as the amount of stuffing tends to depend on the room.

Best
Scott
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Old 18th January 2006, 10:36 AM   #28
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Quote:
Originally posted by Scottmoose
FE206E in FE206ES-R enclosure:
Thanks a lot Scott!

It looks very similar to the FE206ES-R. I guess the hole at 340Hz is because the front radiation and back radiation beeing out of phase and of (approx.) equal level. Some stuffing in the CC/throat or change of CC volume may take care of that and perhaps reduce some other irregularities in the FR.

I'm trying out some measurement software (Good freeware! TombStone at
http://www.tolvan.com/ ) to see what difference stuffing can make. I realize that I should move outdoors to get reliable measurements but the climate of Stockholm doesn't allow me to do that for the moment.

Peter
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Old 18th January 2006, 10:51 AM   #29
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Quote:
Originally posted by Scottmoose


These should be fairly accurate, though they don't take the room into account, or the level of stuffing that you apply to the compression chamber: they assume raw, unstuffed enclosures, as the amount of stuffing tends to depend on the room.

Best
Scott
How is the horn mouth placed in relation to the driver? Does the rear radiation travel the horn length before adding up with the front radiation?

I did a quick run with Hornresponse and got the hole at 200Hz with a path length of 270cm.

Peter
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Old 18th January 2006, 02:22 PM   #30
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Quote:
Originally posted by ulfheden

Does the rear radiation travel the horn length before adding up with the front radiation?
Peter
I believe that's the case. New sheets coming soon that should allow for in-room plots and BSC compensation too.
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