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Old 20th February 2009, 04:51 AM   #21
freddi is offline freddi  United States
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Quote:
as a general rule a high quality driver makes me go through a
lot of my record collection in one sitting.
-- did L. Cao get your "a ways" in one sitting?
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Old 20th February 2009, 03:28 PM   #22
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Quote:
Originally posted by MJK


...the impact/benefit of EQ so people can make intelligent decisions (including me).


EQ has a hidden cost. As long as you remain focused on the frequency response, you can adjust the EQ to give (sometimes) astonishingly tight response. The flipside is that you're twisting the phase as you do so.
It's instructive to note that there's little to no published information on the phase response of most commercial speakers. Full range electrostatics will sometimes brag about their lack of crossovers--which leads to much flatter phase response--but even the biggest, most elaborate systems tend to omit this information. The reason being, of course, that it's all over the map...just plain ugly. It's not too unreasonable to conclude that this is part of the explanation as to why some speakers have magic and some don't.
Full range drivers, taken by themselves, are, like electrostatics, much more 'of one mind' regarding phase. When you start adding woofers to augment the bass and/or tweeters for the treble, you are in peril of losing that "something" that a single driver can do. Solution: Use as low order crossover slopes as you can get away with, and keep EQ as low as possible. For extra credit, keep the EQ away from the crossover points between drivers, as Nelson has with the woofer, where it's all the way down on the bottom.

Grey
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Old 20th February 2009, 03:38 PM   #23
MJK is offline MJK  United States
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Excellent Grey, that is something I had not thought about.

Nelson describes his Eq as follows :

Quote:
... an Eminence Beta 15 in an open baffle with 6 dB of EQ at 20 Hz ...
I am not an amplifier or eletronics person so I am wondering what this means. Is this a second order EQ where the gain at 20 Hz is set to be 6 dB over the original electrical signal? Or is it a shelving filter that is rolled off at 20 Hz? Passive crossover design I understand but electronic EQ is beyond my limited knowledge. I have no idea how to even construct such a device, I only work after the amp in the audio chain.
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Old 20th February 2009, 05:41 PM   #24
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From what I understand, he runs the signal through an electronic (digital?) EQ and boost the 20 hz signal by 6db. I think it's very easy to do if you have an EQ. However, I haven't used one and could be wrong.

A friend who's been working in pro-sound for years highly recommends a digital EQ / crossover, as it's easy to adjust and doesn't "suck the life" out of drivers as some say passive crossovers can.

I could be wrong, but am also curious as I often contemplate going with an EQ, like the Beringer, or a similar device, for upcoming projects.
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Old 20th February 2009, 07:51 PM   #25
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Actually, in this case I used a 2 pole Sallen Key type filter at about
20 Hz and increased the gain until I got a 6 db bump up.

Is this of particular interest?

Attached Images
File Type: jpg bass eq.jpg (46.7 KB, 2055 views)
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Old 20th February 2009, 07:54 PM   #26
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Quote:
Originally posted by freddi
-- did L. Cao get your "a ways" in one sitting?
I'm getting pretty spoiled in this regard. Like fine wines, after a
while you start developing expensive tastes.

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Old 20th February 2009, 09:29 PM   #27
ttan98 is online now ttan98  Australia
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Quote:
Originally posted by Nelson Pass


I'm getting pretty spoiled in this regard. Like fine wines, after a
while you start developing expensive tastes.

Does it mean that L-Cao is not in the class of Lowther or Feastex, or it is just different(slightly inferior?) but still worth the money?
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Old 20th February 2009, 09:48 PM   #28
mp9 is offline mp9  United States
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shouldn't we wait for the alnico version before making those kind of comparisons?
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Old 20th February 2009, 10:04 PM   #29
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Quote:
Originally posted by ttan98
Does it mean that L-Cao is not in the class of Lowther or Feastex, or it is just different(slightly inferior?) but still worth the money?
I know it's an audiophile dream to pay $100 for something and get
something worth $1,000, but I think that takes DIY to get there.

The exceptions are Elna silk electrolytic capacitors and KAB
turntables.

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Old 21st February 2009, 03:57 AM   #30
BDP is offline BDP  United States
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What size baffles were used for these measurements? In other posts you were trying various size baffles. I see that the FR driver was at 36 inches.

BDP
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