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Old 12th June 2011, 10:46 PM   #31
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Quote:
Originally Posted by superlian View Post
Will B5 be a good match to my 2 First Watt F4 who need a signal of ca 14 volt?
I presume not - considering needed swing

but - if you use dedicated gain stage between B5 and F4 ................ then it will certainly work as needed
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Old 21st September 2011, 10:47 AM   #32
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Will B5 handle 2x Eminence Beta15A woofers instead of 1x as Nelson Pass describe it in the manual?

I am especially thinking about the 20hz 6db EQ?
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Old 21st September 2011, 04:30 PM   #33
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yes , why not .
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Old 22nd September 2011, 02:31 PM   #34
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Quote:
Originally Posted by superlian View Post
Will B5 handle 2x Eminence Beta15A woofers instead of 1x as Nelson Pass describe it in the manual?

I am especially thinking about the 20hz 6db EQ?
It should be fine, as long as the amplifier can provide the power at that impedance.
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Old 13th February 2014, 08:45 AM   #35
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A question about the bass EQ:
From the manual "... simple discrete Jfet circuits operated in single-ended Class A
without negative feedback. (The exception is the bass equalization circuit which requires
some feedback to get the curve needed)."
Has anyone an idea what type of circuit is used for the bass EQ ?
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Old 13th February 2014, 09:30 AM   #36
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that's question for Mithrandir

though - it's usually inverting OP stage , as I learn ages ago , from Elector articles (remember small boxes , forcing bass driver to 1m excursion ? )
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File Type: jpg Mithrandir and Woodie.jpg (114.0 KB, 195 views)
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Old 13th February 2014, 09:47 AM   #37
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Well no. Usually this would be a Sallen and Key high pass with a Q of about 2. This can be implemented with an opamp (but I am pretty sure Nelson didn't use one), but it would be wired as an unity gain buffer ( not inverting) anyway. So why is the "B1 type" buffer not feasible here ?
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Old 13th February 2014, 10:12 AM   #38
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what I meant - you can find on web page of Papa's good SR neighbor , pretty much well known around

look at No.5 - Active Filters

edit : pic linked - look at B case

Click the image to open in full size.
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Last edited by Zen Mod; 13th February 2014 at 10:17 AM.
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Old 13th February 2014, 11:19 AM   #39
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Zen Mod, I know this document, it's a shelving filter and serves a similar purpose but it's not like the high pass filter used in the B5. Take a look at page 4 in the B5 manual:
"You see that it provides a 6 dB bump at 20 Hz and filters out subsonics".

The filter in the B5 is actually like the filter one would use for a B6 alignment.
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Last edited by gk7; 13th February 2014 at 11:22 AM.
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Old 13th February 2014, 11:55 AM   #40
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aha

I misunderstood ......
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