Some FR measurements of the new FE166En - Page 2 - diyAudio
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Old 2nd May 2012, 03:04 PM   #11
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Hi Bob, maybe it is, I guess, due to the FF166En has a higher distortion figure, so that loses favour of yours. Frankly the measurement pictures impressed me very much. For a long time, I have been looked for such a driver, but only find it here. And you tell me that yours are still in boxes, do you mean unpacked? Looked at the FF165WK datasheet. Compared with FE166En, the FF165WK looks less efficient, but extends further in the supersonic range. I have got an impression that high efficiency rarely go with low distortion side by side. That might be the case here for FE166En. By the way, what other full range drivers that you would recommend for listening to Rachmaninoff and/or Chopin's piano works? Thank you.
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Old 2nd May 2012, 04:56 PM   #12
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Quote:
Originally Posted by jazzclassics View Post
higher distortion figure
Geddes' research has shown that distortion is WAY down the list of things to consider when looking at a driver, So much so that he asks people who read his book to skip over that chapter.

Distortion in a driver is important, but the numbers we get with current distortion measurement schemes are close to irrelevant. Much like power ratings.

Bob's FE166 are back in their boxes because they really want to be in a horn, and Bob does not build horns.

dave
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Old 2nd May 2012, 05:20 PM   #13
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Those results do look really nice.
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Old 2nd May 2012, 05:23 PM   #14
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Hehe, younger folks need to go read distortion specs of tube amps from the 'golden age' plus human hearing distortion perception that the power level Vs distortion charts they based them on. Today's signal chain by comparison is as sterile as a space lab.

Since we prefer most things 'full'/'rich'/'sweet', an argument can be made to base driver choice more on 2nd harmonic distortion then frequency response.

GM
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Old 3rd May 2012, 04:47 AM   #15
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Quote:
Originally Posted by planet10 View Post
Geddes' research
dave
Hi Dave,
Amazing that you know Bob so well. I just wanted to know the distortion of this driver vs. other drivers about the same size. After reading your post above, I am wondering if I put the FE166En into a bass reflex box, would it sound worse than being in a simple air-tight enlosure of the same size. And what would the frequency response look like. The theory tells that no mater what parameter a driver have, it should have higher bass response when being in an enclosure. And if put in a bass reflex, there should be a peak at some freq. lower than the fs.

Last edited by jazzclassics; 3rd May 2012 at 04:49 AM.
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Old 3rd May 2012, 05:01 AM   #16
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Hehe, younger folks need to go read distortion
GM
Hi GM,

I am not a tube fan. But, it has been hear over and over again that tube amps have better sound. I think if that is due to tube amps inheretantly have more 2nd harmonics then it is against Hi-Fi. But, I understand that not all people pursuit Hi-Fi. Most just feel like to pleasing their own ears... Therefore, when evaluate some audio performance, I prefer more objective measurement than subjective judgement.
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Old 3rd May 2012, 05:15 AM   #17
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Quote:
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But, it has been hear over and over again that tube amps have better sound. I think if that is due to tube amps inheretantly have more 2nd harmonics then it is against Hi-Fi.
That is just not true.

It is well known that 2nd order is less audible than 3rd, and that higher orders than that can get quite objectionable in even small quantities.

A hifi amplifier has a monotonic decrease in the quantity of each harmonic, and should have vanishingly little of higher order.

It is single ended amps (tube or SS) or artfully designed PP amps that accomplish this.

As a generalization, triodes are the most linear amplification devices available (Nelson's new audio SITs have similar curves,but aren't really all that available yet).

dave
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Old 3rd May 2012, 05:41 AM   #18
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Quote:
Originally Posted by jazzclassics View Post
Hi Dave,
Amazing that you know Bob so well. I just wanted to know the distortion of this driver vs. other drivers about the same size. After reading your post above, I am wondering if I put the FE166En into a bass reflex box, would it sound worse than being in a simple air-tight enlosure of the same size. And what would the frequency response look like.
I know what kind of boxes Bob builds and i know how an FE166 does in a not-a-horn.

Here is your sim, standard set of sealed boxes and a sensible BR.

Click the image to open in full size.

dave
Attached Images
File Type: gif FE166En-simSet.gif (38.2 KB, 270 views)
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Old 3rd May 2012, 08:11 AM   #19
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Those look like 126 rather than 166 figures?
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Old 3rd May 2012, 08:42 AM   #20
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Oops, wrong Sim set -- even says FE126En on it. Thanx Scott. Fixed now

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