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Old 20th October 2008, 04:04 AM   #1
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Question Guess, what is it?

What is it, who knows?

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Old 20th October 2008, 04:06 AM   #2
infinia is offline infinia  United States
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Was it once known as a planet?

Is that small triangular box on the floor the active amps?
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Old 20th October 2008, 04:40 AM   #3
jol50 is offline jol50  United States
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Its a paralleled hybrid infusion transponder.
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Old 20th October 2008, 04:49 AM   #4
49 - for the 18th time - again!
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Location: Near "Music City" (Nashville Tennessee)
http://www.linkwitzlab.com/pluto-wa_2.htm

It's a very nice speaker according to several people that have listened to them.

Take a look at the RMAF thread and you will see some very favorable comments. I have not had a chance to listen to this speaker so I am not able to offer any impressions myself.
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Old 20th October 2008, 05:39 AM   #5
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Yes, there are nice speakers. Quite flat frequency response, very good stereo imaging. But rumbles from a turntable caused audible Doppler effect unfortunately, due to huge excursion of small areas.
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Old 20th October 2008, 06:34 AM   #6
lineup is offline lineup  Sweden
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Quote:
All power amplifier stages utilize
the high-performance National Semiconductor LM3886 integrated circuit.
................
The operational amplifiers are Burr-Brown/Texas Instrument OPA2134.
They are quiet and have very low distortion.
Quote:
The tweeter channel has a gain control stage which is linear in dB.
It is followed by the
two stages of a 4th order Linkwitz-Riley highpass filter and
then an allpass for correcting the phase shift
due to offset in acoustic centers between woofer and tweeter.
The notch filter equalizes a peak in the tweeter response.
The last stage is the power amplifier.
http://www.linkwitzlab.com/Pluto/electronics.htm

A typical active system: chip pre crossovers -> chip powers -> drivers.
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Old 20th October 2008, 05:45 PM   #7
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It was easy one;

now, what is this? Alcohol was needed for this construction...

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Old 20th October 2008, 05:56 PM   #8
00940 is offline 00940  Belgium
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it's a Nelson Pass amp. He posted pics of that one under construction here : DIY heatsinks

No idea which amp it is though
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Old 20th October 2008, 06:05 PM   #9
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Quote:
Originally posted by 00940
it's a Nelson Pass amp. He posted pics of that one under construction here : DIY heatsinks

No idea which amp it is though
I don't know either that lucky winner who belongs it to now. Nelson brought such unfinished amps to donate to fellow DIY community. Also, he brought many of other goodies, like this nice compact transformers:

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Old 20th October 2008, 07:57 PM   #10
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One more mystery item...

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