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Old 9th November 2012, 01:39 AM   #131
ra7 is offline ra7  United States
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It's probably too late, but here's a few pics from my visit.

1. LX521: Linkwitz's new speaker was superb. The sound was utterly seamless, neutral and realistic. Superb!

2. BBQ boys: Shout out to the boys who cooked food. That was a great dog!

3. The First Watt: Nelson was showing how much power the SIT-2 was putting out. Even on crescendos it never moved outside 1 watt.

4. Nelson's OB: Slot loaded OB using a different arrangement. Field coil Lowther mated to Eminence Definimax.

5. F6: Got to hear the F6! Yayyy!
Attached Images
File Type: jpg LX521.jpg (287.3 KB, 410 views)
File Type: jpg BBQ_boys.jpg (248.6 KB, 390 views)
File Type: jpg firstwatt.jpg (246.5 KB, 383 views)
File Type: jpg NP_OB1.jpg (245.4 KB, 376 views)
File Type: jpg NP_OB2.jpg (219.3 KB, 344 views)
File Type: jpg F6.jpg (182.3 KB, 202 views)
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Old 9th November 2012, 03:54 PM   #132
gl is offline gl  United States
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That 'first watt' oscilloscope display was a real eye opener. The scope wouldn't even trigger until the output went above about 300 milliwatts. It was amazing to me sitting in a row 2 center seat (to my own amplifier actually) how loud the music was playing before the scope even triggered.

I really do understand now the importance of that 'first watt'.

Many thanks to Nelson. The oscilloscope was an inspired idea.

Graeme
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Old 9th November 2012, 04:22 PM   #133
ra7 is offline ra7  United States
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The key is efficient speakers. Those Lowthers were nearly 100 db/W. Try an 88 db/W bookshelf and it will need more than 1 watt, but probably not a lot more.
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Old 9th November 2012, 04:29 PM   #134
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Quote:
Originally Posted by ra7 View Post
The key is efficient speakers. Those Lowthers were nearly 100 db/W. Try an 88 db/W bookshelf and it will need more than 1 watt, but probably not a lot more.

yes this is the key ,we need a 100db speakers and a low power amp, but class A ,ss or tube ...
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Old 9th November 2012, 06:59 PM   #135
Zen Mod is offline Zen Mod  Serbia
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Quote:
Originally Posted by gl View Post
.....

Many thanks to Nelson. The oscilloscope was an inspired idea.

......
damn he

spiritus movens

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Old 9th November 2012, 07:05 PM   #136
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Do not show that to the HIFI world. It wold deflate so many strongly held beliefs.
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Old 9th November 2012, 09:10 PM   #137
gl is offline gl  United States
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Quote:
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The key is efficient speakers. Those Lowthers were nearly 100 db/W. Try an 88 db/W bookshelf and it will need more than 1 watt, but probably not a lot more.
I generally agree.

But let's take your 100 dB/W number and consider that a satisfyingly loud listening experience was being produced by what I assume was approximately 250 mW of power. If we hike the power level by 12dB to 1000 mW and run that into an 88 dB/W (12 dB/W less) system we should still be producing a roughly equivalent experience and staying within that first watt.

And to be honest I don't know if the scope was displaying peak or average watts. I've always assumed that Nelson's 'first watt' is expressed as average power. So if the scope was displaying peak watts, then there's another 6dB of margin in there.

Graeme

Last edited by gl; 9th November 2012 at 09:14 PM.
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Old 9th November 2012, 09:24 PM   #138
Zen Mod is offline Zen Mod  Serbia
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1 or 10

who cares

I care and refuse zero more
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Old 9th November 2012, 10:06 PM   #139
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that amp is xo at 160hz ... W is much lower.....
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Old 9th November 2012, 10:13 PM   #140
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Quote:
Originally Posted by ra7 View Post
The key is efficient speakers. Those Lowthers were nearly 100 db/W. Try an 88 db/W bookshelf and it will need more than 1 watt, but probably not a lot more.
A mere 250 mW is trivial. I continue to wonder if it may be possible to simultaneously energize the field and voice coils of this Lowther with a SIT amp. Please see the Thread "Pass at BAF 2012"; posts #15-20 for the attendant dialog. Fortunately, Mr. Pass has these Lowthers,the SIT amps, and the critical hearing assets to do this experiment.
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