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Old 1st April 2008, 02:17 PM   #1251
AndrewT is offline AndrewT  Scotland
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Quote:
Originally posted by MikeHunt79
Is anyone using this pre-amp on the outputs from a DCX2496?

I think it would be ideal as you could control all 6 channels at once but I'm sure if the output impedance of the dcx would be ok....
It seems to be a major undertaking to match two channels.
Matching 6channels becomes monumental.
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Old 1st April 2008, 03:14 PM   #1252
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Quote:
Originally posted by AndrewT
It seems to be a major undertaking to match two channels.
Matching 6channels becomes monumental.
Back to square one. I'll have a look into another solution...
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Old 1st April 2008, 03:41 PM   #1253
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Default Multi channel

Originally posted by AndrewT
It seems to be a major undertaking to match two channels.
Matching 6channels becomes monumental.

Hopefully not when using DACs and a micro....but time will tell!
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Old 1st April 2008, 10:27 PM   #1254
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Time for some more recruiting, to all the new posters please be good guys and vote here for a new Passive Preamp Heading

http://www.diyaudio.com/request/


Cheers George
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Old 7th April 2008, 02:13 AM   #1255
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Default lightspeed

Hi george,

Think it's time to tell you my litlle story.
After having read more than 1200 messages ,and several days later, about musical optocouplers, Is thought my time had come!
So after ordering 12 litlle black 'S'marbles at Allieds I was able to match at least four out of a reasable average batch!
Put things together in your way, with a single motorised pot, remotecontroled. Tripple regulated 5volt. Noughty as I am, four 10uF simple el.condensors over the led-connections and go!!!
And go...means music! Must say sound improved, litlle sharpness from the first hour turned into smoother ver homogenous sound.
After 50years working with sound, I can tell you, it keeps me wondering. Some now and thens you meet things in toying with audio where you have no simple answers for!
Thanks for the great idea and for having me put on building one.
Btw the remotecontrolething I did I can advice to anyone. It's the Remote1 with the 16-Alps motorpot. From: Dantimax.
So, for guys and girls who are still hesitating building a beautifull
volumecontrole, start now building one! You will not regret it..
Or buy one from George. Saves you at least the time of matching
the optocouples. Which is, thanks to this forum, the only hard part of the project.
Have though a small question. I prefer playing through an old, modified and beautfull sounding combination of two Quad ESL63 speakers, fed by a rejuvenated (Netaudio,England) quad 303 amp. Since this amp has a rather low input impedance(22Kohm)
athough very good sounding with the lightspeed,I wonder if you ,looking at the drawing, can advice changes in the inputc
irquitry.
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Old 7th April 2008, 02:13 AM   #1256
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Default lightspeed post 1256

Hi Georgehifi,

This message belongs to 1256.I don't succeed in bringing in the drawing of my amp
I have link here:.http://www.geocities.com/ResearchTri...ad303cirb.html
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Old 7th April 2008, 05:37 AM   #1257
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Glad you bit the bullet and built one for yourself, as I say to everyone wait till you hear it, you will not believe what you were listening too before no matter how good a active or passive pre you've had the you know Lightspeed is something special when you first hear it.
I just got back from demo'ing another Lightspeed Attenuator, this guy has a massive 4 separate box Jadis 500 poweramps, top Alon speakers huge, Teac DV60 cd, and his pre was a very expensive Matisse Reference. The Lightspeed killed it blew it away, he bought immediately, and is now selling the Matisse Reference pre.

As for quick look at your circuit diagram of the Quad input, it looks to me like it's got a 220K for R100, that why it sounds good already. If that's an earth rail at the bottom.

Cheers George
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Old 9th April 2008, 10:33 PM   #1258
tubo is offline tubo  Philippines
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Hey guys,
i was really tempted to ask george to build me one but changed ny mind because if i build it myself and make it work it will be very satisfying.
so i have purchased 20 ldr but do not know how to match it! so questions are as follows.

1. is anybody willing to match 4 ldr out of 20 for a fee and gets to keep the remaining ones?

2. how do i match it? ive read the threads and got some idea but i would like to know what equipments are needed?

i apologize for all the newbie questions.
thanks,

ivan
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Old 10th April 2008, 03:13 AM   #1259
xaudiox is offline xaudiox  Philippines
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ygpm ivan..
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Old 18th April 2008, 05:02 PM   #1260
ssmith is offline ssmith  France
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I'm also biting the bullet and ordering 10 LDRs for one pre. Hopefully that should be enough to get 2 pairs decently matched.

Likewise, however, I can't find on the thread a clear explanation on how to match... would be great if someone could post a little diagram!!
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