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Old 10th June 2008, 03:06 AM   #811
Salas is online now Salas  Greece
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Can anyone describe the Feastrex signature vs the Lowther signature?
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Old 10th June 2008, 03:15 AM   #812
defect9 is offline defect9  Ireland
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Quote:
Originally posted by salas
Can anyone describe the Feastrex signature vs the Lowther signature?

Nelson Pass did (somewhat) in a thread he started. This post outlines it nicely:

http://www.diyaudio.com/forums/showt...90#post1534790

-Jared
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Old 10th June 2008, 03:29 AM   #813
Salas is online now Salas  Greece
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Thanks, I was just reading that. That is why I asked for more opinions. Lowther is something many of us have listened to. Its a good reference point so to gauge Feastrex.
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Old 10th June 2008, 03:43 AM   #814
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I really can't...
But I will say this....
Sold my Lowther DX3 last week end.
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Old 10th June 2008, 04:04 AM   #815
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Quote:
Originally posted by Phil Townsend
I really can't...
But I will say this....
Sold my Lowther DX3 last week end.

Is it that the Feastrex signature just feels ''right'' and the fullfilment factor grows over any sense of analytic comparison?
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Old 10th June 2008, 04:48 AM   #816
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Default Yes

Yes I would say that is correct...it feels right but it is more than that.
It feels easy... you can listen all the live long day and into the night.
Poorly recorded stuff is still poorly recorded but the stuff that is well recorded is very .... no words.

The DX3's pushed itself just a bit so after 3 or 4 hours I would turn them off.
Hey, they were good, really good.

I was not in the least bit sad as Richard B toted them away... after all I had a pair of 5Dnf's sucking on my 45's.

I have a very hard time converting how a system sounds into words. Its not like I don't know what is happening, (well sometimes I have no clue) I do. If the sound is "off" or sounds "funny" I will try something to fix it. Most of the time my guess as to the weak spot is right on. Then a fix is in order. It is after all cut and try, at least for me. I certainly am not a good engineer. Maybe just slightly below average E.E. So it is harder for me to understand whats going on.

So far with the 5Dnf there is little to try and fix...
Time will tell.
I have had them up and running for about 3 months.
The cabs need some work as to stuffing and I still have not put sand in the spine. It just that they sound so good, why bother.
I guess as time goes on maybe I'll feel the need to adjust, to try to make it better but not yet.


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Old 10th June 2008, 08:32 AM   #817
bcherry is offline bcherry  Hong Kong
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Default WT3 measurements

Quote:
Originally posted by bcherry
[B But I may need to wait until we have the high-voltage filament supply as I understand 15 V is optimum so would be nice to compare a different voltages.
[/B]

Quote:
Originally posted by bcherry

Nf5ex
Revc= 14.8465 ohms
Fs = 85.2455 Hz
Zmax= 234.0638 ohms
Ro = 58.9493 ohms
F0 = 74.8698 Hz
F1 = 123.4567 Hz
Fmin= 718.4830 Hz
Qms = 6.9664
Qes = 0.4718
Qts = 0.4419
Le = 0.3586 mH @1kHz
XLe = 16.6969 impedance @1kHz
PLe = 7.7562 phase @1kHz
Diam = 105.0000 mm ( 4.1339 in )
ConeArea = 8659.0145 mm^2( 13.4215 in^2)
Vas = 7.1865 L ( 0.2538 ft^3)
BL = 9.2785 N/A
Mms = 5.1079 g
Cms = 682.4293 uM/N
Kms = 1465.3534 N/M
Rms = 0.3927 R mechanical
Efficiency = 0.9096 %
Sensitivity= 95.5885 dB @1W/1m

Brian
some measurements with WT 3:
10/15/16.5 V
z: 180/205/210
LE: .581/.5595/.5549
QMS: 6.09/6.096/6.11
Q. ES: .6104/.5329/.5209
Q. TS: .5548/.4901/.48
FS (doesn't change) 80.75 Hz
regards
Brian
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Old 10th June 2008, 11:04 AM   #818
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Default Re: WT3 measurements

Quote:
Originally posted by bcherry
Q. TS: .5548/.4901/.48
How about that! Even at 10V it is more highly damped than its permanent magnet counterpart.

On the other hand, it seems like you would have a hard time getting it down to a Qts of 0.4, even at a fairly high field coil voltage.

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Old 10th June 2008, 11:47 AM   #819
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Quote:
On the other hand, it seems like you would have a hard time getting it down to a Qts of 0.4, even at a fairly high field coil voltage.
Hmmm, so it will not be best for BLH-type cabinets. For some, that will be a benefit, for others quite the opposite.

I do wish that someone could do the same measurements for the larger drivers - along with an efficiency measures. I have seen some > 105 dB estimations for the larger drivers... though if the Hx of the smaller drivers is anything to go by, I would guess the real efficiency to be significantly lower. I hope not, because if they are > 100dB and other parameters are available I will likely spring for some, but...

Cheers
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Old 10th June 2008, 02:19 PM   #820
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Quote:
Originally posted by rcdaniel

Hmmm, so it will not be best for BLH-type cabinets.
That may indeed be the case; however, it should be kept in mind that the WT3 measurements may be somewhat limited in their usefulness as a guideline. The Qts will tend to vary depending on the strength of the input signal (going down as the input signal becomes stronger); if the WT3 is like the WT2 (the two are made by different companies) the signal used is not very strong at all. Also, some people have reported that the D5nf sounds good in BLH enclosures, and those people at least will probably not hesitate to use the NF5ex with a BLH enclosure. The WT2 gives Qts of 0.4 for the D9nf, and at least one person is absolutely thrilled with the way that sounds in BLH. In general, of course, the lower the Qts, the more obviously suitable it will tend to be for BLH . . .

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