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Analog Line Level Preamplifiers , Passive Pre-amps, Crossovers, etc.

Salas DCG3 preamp (line & headphone)
Salas DCG3 preamp (line & headphone)
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Old 22nd January 2017, 12:41 PM   #1161
Morde is offline Morde  Finland
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Salas DCG3 preamp (line & headphone)
Quote:
Originally Posted by Salas View Post
Great news. Congratulations.
Nice with the LCD-2s as we were confident by their test data they will be driven well even with your milder bias/gain settings and so it went.
But its also nice to know its a success for you in another role too. I.e active monitors line level drive (through long cables in your setup?). Genelec is a very respected Finish company in the recording monitors sector. They are especially good in doing compact ones like that G3 of yours. Which I have listened to. But I also like their big three ways along those from Klein & Hummel. Do post some pics of your finished DCG3 whenever possible if you may.
The cables from DCG3 to speakers are approx. 2 m long. Please find attached a few pics taken merely with my iPhone. I know the wiring is a bit of mess, but after all the main thing for me is that the preamp is quiet, so it's hard to find motivation for making it more tidy. Also I run out of silver wire, so I had to put some black coax cable into the mix as well.
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Old 22nd January 2017, 12:46 PM   #1162
Salas is offline Salas  Greece
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Salas DCG3 preamp (line & headphone)
Splendid. Wishing you long & happy listening.

P.S. Next TV should be in white frame
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Old 22nd January 2017, 12:49 PM   #1163
Salas is offline Salas  Greece
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Salas DCG3 preamp (line & headphone)
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Originally Posted by AndrewT View Post
But he used the Mains Bulb Tester to prove no error in PSU wiring before he added the amplifier/s !

And if he comes back and tells you he did not check his PSU then I suggest you consider sending him to the sin bin for a week.
He, he, but its not in the forum''s rules
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Old 22nd January 2017, 12:53 PM   #1164
AndrewT is offline AndrewT  Scotland
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Maybe time to make it a new rule and place a sticky advice somewhere.
How many questions would that eliminate from our Beginners/Improvers/Intermediates/Advanced/Professionals?
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Old 22nd January 2017, 01:01 PM   #1165
RCruz is offline RCruz  Switzerland
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Salas DCG3 preamp (line & headphone)
Quote:
Originally Posted by AndrewT View Post
But he used the Mains Bulb Tester to prove no error in PSU wiring before he added the amplifier/s !

And if he comes back and tells you he did not check his PSU then I suggest you consider sending him to the sin bin for a week.
Quote:
Originally Posted by Salas View Post
He, he, but its not in the forum''s rules
Quote:
Originally Posted by AndrewT View Post
Maybe time to make it a new rule and place a sticky advice somewhere.
How many questions would that eliminate from our Beginners/Improvers/Intermediates/Advanced/Professionals?
Off course I did test the PSU before installation. It did not sing when just loaded with 200ohm resistors.

The mechanical noise only appears after connecting it to the real load.

There are no wiring errors... everything was verified.
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Old 22nd January 2017, 01:27 PM   #1166
Salas is offline Salas  Greece
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Old 22nd January 2017, 03:39 PM   #1167
Hikari1 is offline Hikari1  United States
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Quote:
Originally Posted by AndrewT View Post
with a gain of 3x in the pre-amp and 6x in the F5 you have a total gain of 18times (+25.1dB).
The maximum output of the F5 is ~14 to 15Vac
Your sensitivity for maximum power is ~800mVac
What are you using as your sources?
Andrew, Iam aware of the math. I know I can drive the amp to full power with 3x or 4x. But the f5 is an amp that seems to prefer some preamp gain.
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Old 22nd January 2017, 04:22 PM   #1168
AndrewT is offline AndrewT  Scotland
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Originally Posted by Hikari1 View Post
Andrew, Iam aware of the math. I know I can drive the amp to full power with 3x or 4x. But the f5 is an amp that seems to prefer some preamp gain.
What?
You think it sounds better if you add extra gain to drive the amplifier into clipping !
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Old 22nd January 2017, 04:59 PM   #1169
RCruz is offline RCruz  Switzerland
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Salas DCG3 preamp (line & headphone)
Been listening to my rig in the main system and now I start do understand it's strengths...

Bass control and detail are on another league compared to my DCB1

Mids are well behaved and voices come out clear and well blended.

As for the highs, these are very good with extension and without harshness.

It sounds better than the gainwire and highs are more fluid.

The extra gain is welcome in my setup.

It lacks the ultimate spatiality I can get with the DCB1 but overall presentation has more guts.

Must find an AD823 (could not find it with legs) so I am using a OPA2604AP
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Last edited by RCruz; 22nd January 2017 at 05:24 PM.
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Old 22nd January 2017, 05:21 PM   #1170
Hikari1 is offline Hikari1  United States
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Originally Posted by AndrewT View Post
What?
You think it sounds better if you add extra gain to drive the amplifier into clipping !
Andrew, I have had everything from a 0db gain (buffer) to 20db gain preamps in front of the f5. My f5 with my speakers likes a little more preamp gain than the math suggests even when playing below clipping levels. Math is one thing, listening is another.
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